Download Diastolic function: physiology, methods and clinical significance

Chapter
2
Diastolic function:
physiology, methods
and clinical significance
Background of the present thesis
rom a physiological point of view the heart is an integrated muscle-pump system.
The term diastole is interpreted as a division, notch, or separation between two
contraction-relaxation cycles (Brutsaert 1984). In this interpretation its meaning is
restricted to the passive properties of the heart (Gillebert 1994). Diastole of the
left ventricle starts when active relaxation has been completed and includes the
diastasis and the atrial contraction phase (Figure 2.1). In the English medical literature
diastole has however come to mean "the dilatation or period of dilatation of the heart,
especially that of the ventricles, coinciding with the interval between the second and
first heart sounds" (Brutsaert 1984). In this interpretation it is that part of the cardiac
cycle which starts with the isovolumetric relaxation phase and ends with cessation of
mitral inflow (Arrighi 1995). In the present thesis the latter, clinical definition of diastole
will be used.
Ebstein extensively discusses the history of views on diastole in 1904
(Ebstein 1904). Mackenzie devides the heartcycle in a presphygmic period with rising
ventricular pressure between closure of the atrio-ventricular valves and opening of the
aortic valves, a sphygmic or pulse period with opened aortic valves, and a
postsphygmic period after aortic valve closure and before atrio-ventricular valve
opening where ventricular pressure is falling (Mackenzie 1914). Wiggers suddevided
the cardiac cycle into smaller phases (Wiggers 1921). In his view, diastole is preceded
by protodiastole, the period between end of ventricular contraction and closure of the
semilunar valves. The period of diastole then begins with closure of the semilunar valves
and isometric relaxation. After opening of the atrio-ventricular valves a period of
diastolic inflow begins. In case of a sufficiently long diastolic interval a period of
diastasis is recognised in addition. Wiggers subdevided the period of auricular systole
in a period in which auricular contracction exerts effect on ventricular filling or ventricular
tension, and a period of auricular filling by venous return from the pulmonary circulation
(Wiggers 1921).
In 1978 new interest arose on relaxation and diastole, since symptoms of
cardiac disease could be succesfully related to pathophysiology of diastole (Meijler
F
6
Chapter 2
S
D
IC EJECTION IR RFP
SUCTION
S
CLINICAL
DEFINITION
DIASTASIS
PASSIVE FILLING
D
ATRIAL
CONT
R
MUSCLEPUMP
FIGURE 2.1. Definition of diastole
according to the analogy between
isolated cardiac muscle and intact
left ventricular function. Time traces
of force (f) and length (l) of an
afterloaded twitch with physiologic
relaxation
sequence
are
synchronized with left ventricular
pressure (P) and volume (V). In one
heart cycle systole (S) and diastole
(D) alternate. Systole is the period
of contraction and relaxation.
Diastole is the period between two
contraction-relaxation
cycles
(Gillebert 1994). In the clinical
definition diastole starts with the
isovolumetric relaxation (IR) phase,
includes
the rapid filling phase
(RFP), the period of diastasis, and
the atrial contraction phase, and
ends before the isovolumetric
contraction (IC) phase, (Brutsaert
1984).
and Brutsaert 1978).
Heart failure can be defined as "the pathophysiological state in which an
abnormality of cardiac function is responsible for failure of the heart to pump blood at
a rate commensurate with the requirements of the metabolising tissues, or to do so
only from an elevated filling pressure" (Braunwald 1992). As a consequence, in
diastolic failure increased resistance to ventricular filling leads to elevated ventricular
filling pressures or inadequate cardiac output. Accordingly, an increase in pulmonary
wedge pressure may lead to symptoms of congestion. It is clear that within this
definition many cardiac diseases may result eventually in diastolic failure, including
reduced systolic performance, pericardial and valvular disease (Table 2.1). The main
causes of diastolic failure can be divided into relaxation abnormalities, decreased
compliance and inappropriately high heart rates (Brutsaert 1993). All three causes can
contribute separately to diastolic failure, but in many conditions they act together.
Diastolic function: focus on the present thesis
7
DIASTOLIC PHASES
The four phases into which diastole is divided (isovolumic relaxation, rapid filling,
diastasis and atrial systole) will be discussed briefly (Figure 2.1). Relaxation of the heart
is a dynamic process of isovolumic relaxation and early rapid filling. Rapid filling still
continues after relaxation has been completed. A relatively small volume portion is
shifted into the left ventricle during diastasis. In the atrial contraction phase
intraventricular blood volume increases again.
Isovolumic relaxation. Relaxation is a catecholamine dependent energy consuming
process in which large portions of adenosine triphosphate (ATP) are used. The
dissociation of actin-myosin crossbridges results from an allosteric action of ATP, i.e. a
reaction of ATP with a site at the myosin head other than the binding site of actin
causing the actomyosin “rigor complex” to dissociate (Figueredo 1993, Apstein 1994).
This process is called the "plasticising effect" of ATP. Further relaxation is assured by
rapid resequestration of cytosolic calcium in the sarcoplasmic reticulum by
sarcoplasmic reticulum calcium ATPase, which is activated by phosphorylation of
phospholamban, a regulatory subunit of the calcium pump of the sarcoplasmic
reticulum. The affinity of the calcium receptor site on the troponin-tropomyosin complex
for calcium is decreased by phosphorylation, thereby increasing the rate of
dissociation of calcium from troponin C and enhancing relaxation (Morgan 1991). This
process of relaxation starts in late systole and ends in mid-diastole, causing the
intraventricular pressure to decline (Brutsaert 1984).
Left ventricular pressure first falls below the pressure in the aortic root, which
causes the aortic valve to close. Pressure continues to decline until below left atrial
pressure, so that the mitral valve will open, and rapid filling begins. The decline of
pressure in time approximates an exponential curve, but in the non-filling heart the left
ventricular pressure frequently reaches a negative asymptote due to elastic recoil (Yellin
1986, Yellin 1994). The rate of myocardial relaxation is influenced by several
independent factors in the intact heart (Brutsaert 1980, Brutsaert 1984): (1) Pre- and
afterload, (2) inactivation (which itself is influenced by neurohumoral factors, the
coronary circulation, and the use of drugs), and (3) regional nonuniformity (of load and
inactivation). Furthermore, impaired relaxation, whether incomplete or slow, must be
discerned conceptually from prolonged systolic contraction, which is a physiologic and
compensatory situation merely leading to delayed or retarded relaxation (Brutsaert
1993). In prolonged contraction, which can be seen in acute and chronic systolic
pressure or volume loading, the early phase of hypertrophy and increased contractility,
an upward shift of the diastolic part of the pressure-volume relation which is seen in
impaired relaxation, is not observed.
8
Chapter 2
TABLE 2.1. Summary of conditions in which left ventricular diastolic dysfunction may be involved, their
pathophysiology and mechanisms (Vasan 1996, Grossman 1991).
Hypertension
Mechanism
Pathophysiology
↓ relaxation
•
↑ afterload (↑ contraction load)
•
nonuniformity (regional variation in
•
↓ coronary reserve
•
↓ myocardial compliance (fibrosis)
•
altered chamber geometry
•
↑ coronary turgor
•
retarded inactivation (diastolic calcium
•
nonuniformity (regional variation in
↓ chamber compliance
•
↓ myocardial compliance (altered
↓ relaxation
•
retarded inactivation
•
↑ contraction load
•
nonuniformity (regional variation in
•
regional fibrosis
•
↓ regional myocardial compliance
↓ relaxation
•
pressure overload
↓ chamber compliance
•
concentric hypertrophy
↓ chamber compliance
Coronary artery disease
- Myocardial ischemia
- Myocardial infarction
↓ relaxation
↓ chamber compliance
Valvular heart disease
- Aortic stenosis
- Mitral stenosis
↑ atrial ventricular pressure •
resistance to atrial emptying /
- Aortic regurgitation
↓ relaxation
•
volume overload
↑ chamber compliance
•
eccentric hypertrophy but decreased
•
altered collagen matrix
- Mitral regurgitation
idem
idem
Hypertrophic cardiomyopathy
↓ relaxation
•
nonuniformity (regional variation in
•
↓ coronary reserve
•
↓ relaxation load
•
↑ contraction load (obstruction)
•
↓ myocardial compliance
•
altered chamber geometry
•
↓ myocardial compliance (deposits,
•
deposits (e.g. sarcoid)
•
altered collagen matrix
↓ chamber compliance
Restrictive cardiomyopathy
↓ chamber compliance
Constrictive pericarditis
↓ end-diastolic chamber
•
↓ diastolic capacity
Dilating cardiomyopathy
↓ relaxation
•
diastolic calcium overload
•
retarded inactivation
•
altered collagen matrix
•
↑ end-diastolic volume
↓ compliance
Diastolic function: focus on the present thesis
9
Rapid filling. When left ventricular pressure falls below left atrial pressure the mitral
valve will open. The left ventricle will then be filled by the blood which is accumulated in
the left atrium in the previous systole. The rate of early left ventricular filling is
determined uniquely by the atrioventricular pressure gradient and the impedance of the
mitral valve (Ishida 1986, Yellin 1990, Yellin 1992, Yellin 1994). The atrioventricular
pressure difference, in turn, is determined by the active and passive properties
(relaxation and compliance) of both left atrium and left ventricle. Thus, factors which
determine these properties, like e.g. loading conditions, contractility, and heart rate
influence the early diastolic filling pattern by means of their influence on the pressure
difference.
In experimental canine models in which the left ventricle was withheld from filling
by end-systolic volume clamping, the left ventricular pressure frequently fell below zero
(Yellin 1986, Sabbah 1981). This diastolic suction of the left ventricle is caused by the
storage of potential energy generated by preceding systolic contraction to below the
“equilibrium volume”, i.e. the volume that the left ventricle exhibits when there is no
transmural pressure (Brecher 1966, Yellin 1994). In an experimental setting in dogs the
degree of pressure negativity after volume clamping was increased when contractility
was increased (Hori 1982). Evidence was provided by Udelson et al. that elastic recoil
and restoring forces are also operative in the intact human heart during β -adrenergic
stimulation (Udelson 1990). When, in this experiment, end-systolic volume was further
reduced below the equilibrium volume, minimal diastolic pressure was also reduced.
This probably resulted from an augmentation of internal restoring forces and elastic
recoil, which in turn may result in negative transmural pressure and diastolic suction. So,
the fall in left ventricular pressure at the time of opening of the mitral valve is not only
resulting from left ventricular relaxation, it is also caused by elastic recoil.
The atrioventricular pressure gradient, the driving force of left ventricular filling, is
also determined by left atrial pressure. In experiments by Ishida et al. increased left
atrial pressures by volume loading of mongrel dogs resulted in increased peak rapid
filling rates induced by increased atrioventricular pressure gradients, despite
decreased rate of left ventricular relaxation induced by increased loading conditions
(Ishida 1986). Left atrial compliance will also affect the peak atrioventricular pressure
difference (Keren 1985, Suga 1974). In early diastolic filling, blood leaves the left atrium
faster than it is filled by the pulmonary veins, and its pressure will fall (y-descent).
At first, left ventricular pressure will continue to decline despite early left
ventricular filling, thus accelerating blood into the left ventricle. With increasing left
ventricular volume, left ventricular pressure will rise according to the passive filling
characteristics, that are determined by viscoelastic properties of the myocardium,
myocardial thickness, and external constraints, e.g. pericardium, right ventricle and
lungs (Yellin 1990, Little 1990, Janicki 1990, Little 1995). Once relaxation and elastic
recoil are completed, left ventricular filling will continue because of inertia, i.e. the mass
of flowing blood (Yellin 1990). Early left ventricular filling rate, i.e. the first derivative of
10
Chapter 2
volume-versus-time curve, will diminish when atrioventricular pressure is reversed
(Courtois 1988). This "deceleration" of rapid left ventricular filling is greatly determined
by left ventricular chamber stiffness, so that early diastolic filling deceleration time
decreases as left ventricular chamber stiffness increases (Little 1995). Conversely,
early diastolic filling deceleration time may increase in the presence of mitral stenosis
as a consequence of increased impedance of the mitral valve with prolonged
atrioventricular pressure difference associated with elevated left atrial pressure
(Meisner 1991).
Diastasis. This stage of ventricular filling is generally addressed as being the phase of
passive filling in which the filling rate is slow, the rise in ventricular pressure is
moderate, and the pressures of the left atrium and ventricle have reached an equilibrium
(Arrighi 1995). Some authors however observed a mid diastolic inflow peak into the left
ventricle, arising from a reestablishment of a positive atrioventricular gradient due to left
atrial filling via the pulmonary veins (Keren 1986, Yellin 1992, Biasucci 1990). Middiastolic inflow may contribute more than 20 % of total filling of the left ventricle in dogs,
but is absent in the dilated heart and in mitral stenosis (Biasucci 1990, Yellin 1992).
Atrial systole. The last phase of ventricular filling is dominated by the contraction of the
atria, which causes atrial pressure to rise again above ventricular pressure and induce
a new blood flow into the left ventricle. This phase is influenced by left atrial function,
loading, and heart rate (Wang 1995 , Courtois 1994, Udelson 1994). Atrial dysrhythmia,
hypertrophy, and dilatation may alter this phase considerably (Rowlands 1967, Bonow
1983a, Kono 1992).
ASSESSMENT OF DIASTOLIC FUNCTION
The generally applied non invasive methods to assess diastolic left ventricular function
are radionuclide angiography (RNA), two-dimensional echocardiography and Doppler
echocardiography. The principles of measuring diastolic function with RNA will be
discussed below, whereas the methodology of the latter two techniques will be
discussed only briefly. Cardiac catheterisation with ventriculography is an invasive
method of assessing diastolic properties of the heart and will be discussed as well. The
newer methods of assessing diastolic function, including 2-D colour Doppler, colour Mmode Doppler, and cardiac magnetic resonance imaging, will be mentioned but are not
discussed because they are not (yet) used in routine clinical practice for the purpose of
assessing diastolic left ventricular function. In all techniques, temporal resolution and
filtering strongly influence measurements of left ventricular volume change rate.
Cardiac catheterisation. With cardiac catheterisation it is possible to collect
measures of left ventricular function invasively. When focusing on diastolic function, the
parameters can be divided into those expressing (passive) compliance, and those
Diastolic function: focus on the present thesis
11
expressing (active) relaxation of the left ventricle (Gaasch 1994). Chamber compliance,
the inverse of chamber stiffness can be defined as the instantaneous volume change
per unit change in pressure (dV/dP) and can be calculated when measures of diastolic
left ventricular volume and pressure have been gathered together (Grossman 1986, Van
der Werf 1991). Relaxation can be described with help of the left ventricular pressure
curve during isovolumic relaxation. The first derivative of this curve describes the rate of
left ventricular pressure decline (dP/dt). Although relaxation can be described by peak dP/dt, this factor is influenced by changes in loading (Grossman 1986). A better
parameter to describe left ventricular relaxation is obtained when the time constant τ of
left ventricular pressure decline is calculated (Grossman 1986, Van der Werf 1991,
Shintani 1994). In slow myocardial relaxation τ may be prolonged and vice versa.
Radionuclide angiography. The assessment of global left ventricular diastolic
function with radionuclide angiography is derived from the time activity curve of the left
ventricle, which closely matches the left ventricular volume curve (Figure 2.2). It therefore
represents relative volume changes throughout the cardiac cycle. This curve is also
used for the assessment of global left ventricular ejection fraction. When appropriate
data acquisition has taken place and attention has been paid to the technical
considerations (see below) this volume curve may also be used to study left ventricular
filling, which, as outlined before, is dependent on diastolic left ventricular function.
Parameters of diastolic function include those expressing the filling rate at a certain
moment (e.g. peak filling rate), the timing of this event (e.g. time to peak filling rate), and
relative filling fractions (e.g. early diastolic filling fraction and atrial contribution to
diastolic filling, Udelson 1994).
In the interpretation of diastolic function parameters technical details as well as
physiological variations (the dependency of left ventricular filling parameters on
100
Left ventricular volume
(% end-diastolic volume))
AC
80
EDF
60
PFR
40
TPFR
20
0
0,0
0,2
0,4
0,6
Time (sec)
0,8
1,0
FIGURE 2.2. Time-activity curve
obtained
from
radionuclide
angiography
after
temporal
smoothing
with
5
Fourier
harmonics. Variables used to
describe the diastolic part of the
curve are the contributions of early
diastolic filling (EDF) and atrial
contraction (AC) to the filling
volume; peak filling rate (PFR),
measured
as
the
peak
instantaneous slope of early
diastolic filling; time to peak filling
rate (TPFR) measured from minimal
left ventricular counts or from
maximal left ventricular counts.
12
Chapter 2
variables as age, heart rate and ejection fraction, see chapter 3) must be taken into
account (Bonow 1991, Udelson 1994). The acquisition of left ventricular gated blood
pool scintigraphy can lead to many technical errors (Wagner 1989). Cycle length
fluctuations have a detrimental effect on the diastolic part of the left ventricular volume
curve (Hammermeister 1974). It is therefore essential to exclude extrasystolic and
postextrasystolic beats and use an appropriate cycle-length window (Juni 1988). In the
Martini Hospital in Groningen count “drop-off” was minimised using a 5% cycle length
window with forward gating (Juni 1988). Further, temporal resolution with a high framing
rate is necessary to accurately reflect the instantaneous deflections in the time activity
curve (Udelson 1994). High temporal resolution in the multigated studies of the present
thesis was achieved with a framing rate of 50 frames per second (20 msec per frame).
Obviously, high temporal resolution should not lead to a decrease of the count number
per frame, which might lead to an increasing degree of statistical imprecision. We used
a minimum of 150,000 counts per frame in the present studies of this thesis. Temporal
smoothing could therefore be achieved with five Fourier harmonics, thereby keeping the
risk of systematic underestimation of the filling parameters low (Bacharach 1983,
Bonow 1989, Bonow 1991). Because of an unpredictable variation in red cell tagging
with technetium-99m pertechnetate, and a variable amount of absorption between
patients, measurements of count changes in the time-activity curve must be related
(normalised) to a physiologic variable derived from the time activity curve, e.g. enddiastolic volume and stroke (or filling) volume. Therefore this “normalised” parameter is
not only influenced by the true filling rate (in milliliters/second) but also by the
normalisation parameter. It is therefore recommended to perform normalisation to more
than one parameter (Udelson 1994).
From the obtained time activity curve which closely resembles the left ventricular
volume curve, a number of determinants of left ventricular filling can be taken (Figure
2.2). These parameters are used throughout the present thesis. The peak filling rate
(PFR in end diastolic volume (EDV) or filling volume (FV) per second) is the most
widely used parameter of left ventricular filling, and measures the maximum
instantaneous filling rate during early rapid filling. The normal value varies widely, and is
dependent on age, heart rate, and ejection fraction (see Chapter 3). The time to peak
filling rate (TPFR) is the time interval from minimal left ventricular counts to the peak
filling rate expressed in milliseconds. In the present thesis this interval is used for TPFR,
unless otherwise stated. Time to peak filling rate can alternatively be measured from
maximal left ventricular counts to peak filling rate (Friedman 1986). The duration of
systole is then included. This parameter therefore concerns the entire contractionrelaxation cycle. This may be of importance since in many clinical conditions of diastolic
failure impaired relaxation and prolonged contraction are present in combination
depending on aetiology and stage of the disease (Brutsaert 1993).
The atrial contribution to diastolic filling can be assessed by measuring the
increase in relative left ventricular volume that is due to atrial contraction. The moment of
Diastolic function: focus on the present thesis
13
onset of atrial contraction can either be determined from the time-activity curve or one of
its derivatives, or by using the onset of the P wave on the electrocardiogram and adding
40 ms for assumed atrial electrical-mechanical delay as starting-point for the atrial
contribution phase in the time-activity curve (see Chapter 4). In chapter 8 the term
additional filling fraction (AFF) is introduced because passive diastolic left ventricular
filling is assumed to be partly responsible for left ventricular filling in late diastole.
Echocardiography. The dynamics of left ventricular filling is studied with Doppler
echocardiography of the mitral inflow pattern, which can be divided in an early (E) and
an atrial (A) peak filling velocity (Thomas 1991, Quinones 1991). Deceleration time of
the peak early transmitral Doppler recording and isovolumic relaxation time can be
measured with this technique as well. These parameters have been successfully
correlated with invasive measures of diastolic function, e.g. left ventricular filling
pressures, the time constant of relaxation τ, and pulmonary wedge pressure (Scalia
1997, Störk 1989, Yamamoto 1997, Temporelli 1999). An important Doppler
echocardiographic pattern associated with impaired prognosis in patients with
depressed systolic left ventricular function is the restrictive filling pattern (Nijland 1997).
This pattern has a high ratio of peak E and peak A, accompanied by a short
deceleration time. Information on diastolic left ventricular function can be supplemented
by Doppler pulmonary venous flow parameters (Gentile 1997). High temporal and
velocity resolution are important advantages of the Doppler echocardiographic
examination of left ventricular diastolic function (Thomas 1994). One of the draw-backs
of Doppler echocardiographic measurement of left ventricular diastolic function is
however its reproducibility (Heesen 1998). For repeated measurements in twodimensional echocardiography it is therefore advised to have the patients followed by
one single investigator (Otterstad 1997).
Studies which compared radionuclide angiographic parameters of left ventricular
filling with Doppler echocardiographic measurements show a good correlation,
provided that the parameters are normalised correctly (Friedman 1986, Bowman
1988). Many observations on left ventricular filling physiology and pathophysiology by
radionuclide angiography are paralleled by similar observations on Doppler
echocardiography of the mitral inflow pattern, like e.g. the findings with ageing,
hypertension, and myocardial ischaemia (Mantero 1995, Hoit 1994, Thomas 1994).
More recent techniques like e.g. colour kinesis (Vignon 1998) and colour M-mode
(Stugaard 1993) still lack comparison with radionuclide angiography but are promising.
Magnetic resonance imaging. With magnetic resonance (MR) imaging it is not only
possible to collect anatomic data, but also functional data of the heart (Van Rossum
1998). These functional data can be obtained using different MR techniques, including
cine MR imaging and myocardial tagging with radiofrequency pulses (Van Rossum
1998). With phase velocity mapping it is possible to evaluate parameters of diastolic
14
Chapter 2
left ventricular function, i.e. left ventricular inflow propagation and vortex flow in the left
ventricle (Yoganathan 1997). How these parameters relate to specific cardiac disease
remains to be investigated.
DIASTOLIC DYSFUNCTION IN CARDIAC DISEASE
Normal systolic function. An increasing number of studies have reported on the
presence of congestive heart failure in patients with normal systolic function (Cohn
1990, Bonow 1992, Vasan 1995). The prevalence of normal systolic function among
patients with congestive heart failure varies widely between 13% to 74%. The majority
of studies suggest a prevalence of about 40% (Vasan 1995). The criteria used for
identification of congestive heart failure, age, and the ratio between acute and chronic
congestive heart failure in the study groups are responsible for the variability of the
reported prevalences (Vasan 1995). Patients with congestive heart failure and normal
systolic function at rest are often presumed to have heart failure on the basis of left
ventricular diastolic dysfunction (Vasan 1995). However, the presence of diastolic
dysfunction needs to be substantiated where possible, although uniform criteria for
diastolic dysfunction are not available and have not been applied (Vasan 1995). In
order to come to standardisation of diagnostic criteria for diastolic heart failure, the
European study group on diastolic heart failure proposed guidelines for the diagnosis of
diastolic heart failure (European study group on heart failure 1998). According to these
guidelines, diagnosis of diastolic heart failure requires the presence of signs and
symptoms of congestive heart failure, presence of normal or only mildly abnormal left
ventricular systolic function, and evidence of abnormal left ventricular relaxation, filling,
diastolic distensibility or diastolic stiffness (European study group on heart failure
1998). Radionuclide angiographic abnormalities are only described for PFR: < 2.0
EDV/s (age < 30 year), PFR < 1.8 EDV/s (age 30 - 50 year), PFR < 1.6 EDV/s (age >
50 year) based on a study performed by Bonow et al (Bonow 1988).
In isolated diastolic dysfunction the left ventricle is unable to fill adequately at
normal diastolic pressures (Grossman 1991). Exercise intolerance is one of the
important early symptoms of patients with diastolic heart failure (Kitzman 1991). In the
genesis of acute pulmonary oedema diastolic dysfunction can play an important role
(Grossman 1990). Identification of patients with diastolic left ventricular dysfunction is
important because pathophysiology and therapy differ from that of patients with
primarily systolic dysfunction.
Congestive heart failure with normal systolic function may be seen in a variety of
disorders (Table 1; Grossman 1991). These disorders include structural abnormalities
of the pericardium, and of the myocardium (e.g. amyloidosis, and fibrosis; Kushwaha
1997, Janicki 1994). Valvular heart disease (primarily mitral and tricuspid stenosis)
may cause elevated atrial pressure without systolic dysfunction. In chronic left ventricular
volume overload, e.g. in aortic and mitral regurgitation, diastolic dysfunction expressed
by increased slope of the end-diastolic pressure volume relation may be present without
Diastolic function: focus on the present thesis
15
systolic dysfunction (Grossman 1976). An acute increase of volume load however
causes elevated diastolic filling pressures without primary myocardial dysfunction
(Arrighi 1995). In the presence of right ventricular dilatation, left ventricular diastolic
dysfunction may be present due to ventricular interdependence (Janicki 1990). In left
ventricular hypertrophy diastolic dysfunction may be present as a result of increased
myocardial fibrosis and altered myocardial relaxation. Finally, dynamic disorders
resulting in relaxation abnormalities, e.g. pressure overload in hypertension with or
without left ventricular hypertrophy, and myocardial ischaemia may result in diastolic
dysfunction.
The prognosis of patients with congestive heart failure and normal systolic
function is variable and depends on the underlying pathophysiologic mechanism
responsible for the diastolic filling abnormalities. Reported annual mortality rates are
lower than that of systolic heart failure, and range between 1.3% and 17.5% depending
on aetiology of diastolic dysfunction and age (Vasan 1995).
The definite diagnosis of diastolic congestive heart failure is based on the
evaluation of systolic and diastolic performance showing elevated left ventricular filling
pressures with normal systolic function. A diagnosis of diastolic heart failure is likely
when non-invasive techniques show abnormalities of the left ventricular filling pattern
with normal systolic function (Arrighi 1995).
Depressed systolic function. Signs and symptoms of cardiac failure in patients with
depressed systolic function may partly be due to concomitantly altered diastolic
properties of the myocardium (Grossman 1976). In patients with heart failure and
depressed systolic left ventricular function the severity of systolic dysfunction correlates
with prognosis, but not with exercise capacity or symptom status. (Franciosa 1981,
Rihal 1994). Diastolic function parameters are found to correlate significantly to
symptom status in such patients (Franciosa 1985, Szlachcic 1985, Rihal 1994). An
early sign of diastolic heart failure is diminished exercise tolerance (Packer 1990).
Recent studies on chronic tachycardia-induced cardiomyopathy leading to marked
systolic dysfunction demonstrate that this is associated with an impairment of intrinsic
myocardial relaxation (Shinbane 1997, Zile 1996). In patients with left ventricular systolic
dysfunction the common finding of diastolic dysfunction, a restrictive filling pattern in
particular, appears in addition to left ventricular ejection fraction to be correlated with
increased cardiac mortality (Pinamonti 1993, Rihal 1994, Nijland 1997).
Coronary artery disease. Myocardial ischaemia may cause transient abnormalities of
left ventricular diastolic filling (Arrighi 1995). The majority of patients with coronary artery
disease have abnormal diastolic parameters at rest resulting in decreased early
diastolic filling and increased atrial transport function (Mahmarian 1990). After coronary
artery bypass grafting and percutaneous transluminal coronary angioplasty
abnormalities of diastolic filling appear to normalise (Bonow 1982, Lawson 1988).
16
Chapter 2
Impaired relaxation is caused by increased myocardial cytosolic calcium ion
concentrations arising from decreased calcium sequestration or increased calcium
entry (Bonow 1990). In patients with coronary artery disease left ventricular asynchrony
due to regional ischaemia affects global left ventricular filling (Perrone-Filardi 1992).
Regional left ventricular nonuniformity can be present in ischaemia, after myocardial
infarction, but also in other cardiac conditions e.g. hypertrophic cardiomyopathy and the
normal ageing process (Bonow 1990). After myocardial infarction a restrictive filling
pattern is indicative of diastolic dysfunction due to initial myocardial stiffness or
myocardial failure (Algom 1995). Impaired diastolic filling is a constant pathological
finding in patients with previous myocardial infarction, and is more severe in patients
with concomitant heart failure (Bareiss 1990). In a recent study with Doppler
echocardiography, a restrictive left ventricular filling pattern was a good predictor of
cardiac death (Nijland 1997).
Tachycardia. Left ventricular diastolic dysfunction may emerge in the presence of
inappropriately high heart rates and chronic tachycardia (Brutsaert 1993, Zile 1996). In
the presence of chronic tachycardia left ventricular diastolic dysfunction coincides with
systolic abnormalities (Shinbane 1997). In the experimental setting of chronic pacing
induced cardiomyopathy, the nature of diastolic dysfunction has not been made exactly
clear. Generally, in chronic tachycardiomyopathy impaired left ventricular relaxation,
increased left ventricular diastolic wall stress, and decreased compliance have been
found (Komamura 1992, Zile 1995, Ohno 1994). Administration of inotropic agents
could however normalise decreased early left ventricular relaxation, and decreasing
loading conditions could normalise increased left ventricular end-diastolic wall stress by
reduction of both increased myocardial stiffness and increased time constant of
relaxation τ (Sasayama 1991, Komamura 1992). After cessation of pacing in chronic
pacing induced tachycardiomyopathy the normalisation of left ventricular systolic
function which may occur, is accompanied by development of left ventricular hypertrophy
with persistent diastolic dysfunction, consisting of decreased relaxation and decreased
compliance (Tomita 1991).
In humans with chronic atrial fibrillation with rapid ventricular response, intrinsic
tachycardiomypathy characterised by decreased systolic left ventricular function
normalises after restoration of sinus rhythm or adequate rate control (Morris Jr 1965,
Packer 1986, Grogan 1992, Rodriguez 1993). This tachycardiomyopathy may be
caused by inadequate high heart rate at rest and/or with exercise (Van den Berg 1993).
In chronic atrial fibrillation also the atria itself are dilated (Davies 1972). Most authors
however agree on (partial) functional recovery of atrial function after chemical and
electrical cardioversion, and the maze procedure (Manning 1989, Jovic 1997, Yashima
1997). The increase in Doppler echocardiographic A wave velocity, and decreased E/A
ratio after cardioversion of atrial fibrillation may also indicate (transient) impairment of
left ventricular relaxation (Xiong 1995). New data on this subject are further discussed in
Diastolic function: focus on the present thesis
17
Chapter 8.
Other cardiovascular disease. Impairment of diastolic function is the most
characteristic pathophysiologic abnormality in patients with hypertrophic
cardiomyopathy, leading to decreased early diastolic filling and increased atrial filling
due to diminished relaxation and increased chamber stiffness (Hess 1993, Posma
1994). Also hypertension and secondary left ventricular hypertrophy are manifested by
such diastolic abnormalities (Hoit 1994). Patients with cardiac syndrome X also have
impaired resting left ventricular diastolic filling which improves after the betablocker
atenolol (Fragasso 1997). The normal ageing process is generally associated with
structural and functional changes in the heart, leading to decreased early diastolic filling
and increased atrial filling (Nixon 1994). A recent study addressed the changes of left
ventricular relaxation with age to presence of coronary artery disease, systemic
hypertension, left ventricular systolic dysfunction or hypertrophy (Yamakado 1997). In
addition, restrictive cardiomyopathy including cardiac amyloidosis and sarcoidosis is
associated with impaired ventricular filling (Kushwaha 1997).
THERAPEUTIC CONSEQUENCES
In the choice of a therapeutic regimen for the treatment of congestive heart failure it is of
great importance to know whether it originates from systolic dysfunction or diastolic
dysfunction or a combination (Bonow 1992). The identification of the underlying
mechanisms responsible for diastolic dysfunction has therapeutic significance as well.
Diastolic left ventricular dysfunction may originate from structrural pericardial (e.g.
constrictive pericarditis), myocardial changes, (e.g. myocardial fibrosis or amyloidosis),
or valvular disease (e.g. mitral stenosis, Covell 1990, Kushwaha 1997). These
conditions may require specific surgical or medical interventions. Diastolic dysfunction
may originate from functional changes of the heart as well. Here, diastolic dysfunction
may be reduced by treatment of the underlying disease, e.g. myocardial ischaemia,
blood pressure in case of hypertension, or tachycardia in case of arrhythmia.
Calcium channel blockers in heart failure. The negative inotropic effects of calcium
channel blockers result from depression of calcium transmembrane transport (Iliceto
1997, Packer 1989). In the intact hemodynamic system this negative inotropic effect is
however counterbalanced by peripheral vasodilatation, which reduces left ventricular
afterload, but also initiates neurohormonal activation. Despite these factors, verapamil
and diltiazem reduce ventricular contractility (Packer 1989, Su 1994, Clozel 1989).
Nifedipine however, being a dihydropyridine, increases all contractile indices, probably
resulting from reflex stimulation of the sympathetic system (Ferrari 1997, Iliceto 1997).
Second generation dihydropyridines may also exert their positive hemodynamic effect
by the same mechanism (Lambert 1990). The improvement in cardiac performance
after dihydropyridine administration is however less marked than after the
18
Chapter 2
administration of vasodilators that do not depress cardiac contractility (Packer 1989).
In ischaemic heart disease, regional systolic dysfunction may lead to global left
ventricular dysfunction by remodelling. Calcium channel blockers can play an important
role here, by reducing the extent of dysfunctioning myocardium caused by ischaemia,
and improving the functional recovery of post-ischaemic but viable myocardium (Iliceto
1997). This effect is obtained by coronary vasodilation thereby improving the
myocardial oxygen supply and removing harmful by-products of anaerobic glycolysis
(Nayler 1994). Calcium channel blockers also have an energy saving effect on the
myocardium by means of their peripheral vasodilative action, which reduces afterload,
and by means of their direct negative inotropic myocardial effect. In addition,
myocardial energy demand is depressed by heart rate reduction after administration of
verapamil or diltiazem (Iliceto 1997, Nayler 1994).
Despite beneficial haemodynamic effects of calcium channel blockers in
coronary artery disease, the administration of these drugs in congestive heart failure
can be detrimental (Packer 1989, Elkayam 1993). The unfavourable effects of shortterm administration have been attributed to the negative inotropic properties of calcium
channel blockers. In addition, the reflex augmentation of sympathetic activity in
nifedipine often fails to compensate its direct negative inotropic properties in patients
with congestive heart failure (Elkayam 1990). Long-term treatment with calcium channel
blockers may also have deleterious effects which are probably related to the activation
of neurohormonal systems, including the sympathetic nervous system and the reninangiotensin system (Packer 1989, Elkayam 1993). Although second generation
calcium antagonists do not induce significant neurohormonal activation, no data are
available justifying the use of these drugs in the treatment of heart failure (De Vries
1997).
In the treatment of concomitant angina pectoris, the anti-ischaemic effects of
calcium antagonists may however be useful (The DEFIANT II Research Group 1997).
Several approaches have been suggested to improve the safety of calcium channel
blockers in patients with heart failure including development of calcium channel blockers
that do not activate the neurohormonal system (Iliceto 1997, Elkayam 1993). In one
study the short term treatment of patients with heart failure with the T-channel selective
calcium antagonist mibefradil did not raise sympathetic activity (Van der Vring 1998).
Because of serious drug interactions and arrhythmogenic effects the drug was however
withdrawn from the market by the manufacturer in 1998.
Calcium channel blockers and myocardial relaxation. In coronary artery disease
regional and global left ventricular diastolic function may be impaired as a result of
'silent' myocardial ischaemia (Mahmarian 1990, Bareiss 1990). Relaxation, being an
energy consuming process, may be improved by reversing myocardial ischaemia e.g.
by bypass surgery or percutaneous transluminal coronary angioplasty (Lawson 1988,
Bonow 1982). Calcium channel blockers are also capable of increasing coronary blood
Diastolic function: focus on the present thesis
19
flow significantly, either via natural vessels or collaterals or both. In the presence of left
ventricular relaxation abnormalities due to myocardial ischaemia, they may therefore
improve diastolic function (Dienstl 1992, The DEFIANT II Research Group 1997, Hanet
1990). In addition, a reduction in afterload of the left ventricle by peripheral
vasodilatation may also improve diastolic left ventricular function, as it decreases
myocardial oxygen demand (The DEFIANT II Research Group 1997). The negative
inotropic effect of calcium channel blockers may decrease myocardial energy demand
directly, thus decreasing ischaemia, and improving myocardial relaxation. The latter
explanation is more likely in the administration of phenylalkylamines or
benzothiazepines, but not in dihydropyridines for they may enhance myocardial
contractility (Lahiri 1990).
In hypertensive left ventricular hypertrophy and hypertrophic cardiomyopathy, left
ventricular filling is often impaired as a result of reduced left ventricular relaxation,
reduced subendocardial coronary reserve, a reduction in adenosine triphosphate, or
increased chamber stiffness due to increased myocardial collagen content (Smith
1985, Vatner 1990). In addition, regional nonuniformity which arises from
nonhomogeneous distribution of these factors may further impair global left ventricular
filling (Bonow 1990). Indexes of left ventricular relaxation have been shown to be
improved after the administration of nifedipine, diltiazem, and verapamil (Bonow 1990).
In addition, in these patients verapamil improved exercise tolerance and diastolic
pressure volume relations despite its negative inotropic effect, normalised atrial
contribution to left ventricular filling, and reduced left ventricular asynchrony (Bonow
1985, Bonow 1983b, Bonow 1983a, Bonow 1987).
Finally, the structural and functional changes in diastolic function in the normal
ageing process, may at least in part be reversed by the administration of verapamil
(Nixon 1994, Arrighi 1994).
Diuretics. Diuretics effectively reduce pulmonary congestion and oedema. In
haemodynamic studies with diuretics, filling pressures of both left and right ventricles
are reduced (Udelson 1993). Exercise tolerance can thus be improved with little change
in systolic performance (Brutsaert 1993).
Nitrates. A favourable effect on diastolic performance is also noted with nitroprusside
and nitroglycerin resulting in diminished filling pressures at smaller chamber volumes
(Udelson 1993). However, in diastolic heart failure a drastic reduction of preload may
result in decreased cardiac output with fatigue and exercise intolerance as a
consequence.
ß-Blocking agents. In systolic heart failure ß-blockers depress left ventricular
contractility and relaxation initially (Eichhorn 1992). Long term treatment of heart failure
with ß-blockers may eventually result in increased contractility and improved early
20
Chapter 2
diastolic relaxation (Udelson 1993, Eichhorn 1990). Although the direct effect of ßblockers on the myocardium are unfavourable for diastolic function, the favourable
effects on diastolic function result from reduction of heart rate, blood pressure, left
ventricular hypertrophy, and left ventricular ischaemia, (Bonow 1992, Fragasso 1997).
ß-Adrenergic drugs. Although the short-term infusion of ß-adrenergic drugs has a
favourable effect on early diastolic relaxation, there is no influence on the end-diastolic
pressure-volume relation (Udelson 1990). Because in patients with diastolic
dysfunction, increased heart rate may be unfavourable, ß-adrenergic drugs must be
prescribed with great caution (Smith 1992).
Angiotensin-converting enzyme inhibitors. Angiotensin converting enzyme
inhibitors possibly have a favourable effect on diastolic function. They diminish filling
pressures of both left and right ventricles (Udelson 1990). In addition, left ventricular
hypertrophy and blood pressure are decreased (Bonow 1992). In patients with dilated
right ventricles, the impeding effect of pericardial constraint and ventricular
interdependence on early diastolic filling is diminished by acute angiotensin converting
enzyme inhibition (Konstam 1990). In patients with severe systolic left ventricular
dysfunction long-term therapy with the angiotensin converting enzyme inhibitor enalapril
prevented left ventricular dilatation accompanied by a decreased left ventricular
chamber stiffness (Pouleur 1993).
Digitalis glycosides. Because digitalis glycosides increase intracellular calcium
concentration, they possibly have unfavourable effects in diastolic heart failure. In
contrast, possible indirect effects of digitalis including afterload reduction and lower
end-systolic volumes may provide an association with lowered filling pressures
(Udelson 1993). In a recent study on the effects of chronic digitalisation in systolic heart
failure a decrease in the rate and degree of ventricular relaxation was confirmed
(Hassapoyannes 1998). This effect did however not abolish favourable effects of
digitalis on mortality.
A general approach of patients with diastolic heart failure in terms of drug treatment
does not (yet) belong to present-day practice. Although effects on heart rate,
remodelling and relaxation must be taken into account, the aetiology of heart failure and
the type of diastolic dysfunction are often the key to treatment.
In clinical trials no internationally accepted uniform diagnostic criteria are used
for diastolic heart failure. The lack of uniformity in diagnostic criteria explains why
diastolic heart failure in present day practice often is not recognised and poorly
understood. Prognosis of patients with heart failure and diastolic left ventricular
dysfunction differs from patients with systolic heart failure. Because of the rising
incidence of diastolic dysfunction and heart failure in ageing populations it is of
Diastolic function: focus on the present thesis
21
importance to define normal values and variability in cardiac disease of measures of
diastolic left ventricular function. Then tailored treatment options for patients with
diastolic heart failure may be tested successfully.
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