Download Heart Flow Charts

Cardiac Physiology
Class 1
Cardiac Cycle
Class 2
Figure 20-17 Pressure and Volume Relationships in the Cardiac Cycle.
Step 1
ONE CARDIAC CYCLE
QRS
complex
QRS
complex
Electrocardiogram
(ECG)
T
P
ATRIAL
ATRIAL
DIASTOLE SYSTOLE
VENTRICULAR
DIASTOLE
P
ATRIAL
SYSTOLE
ATRIAL DIASTOLE
VENTRICULAR
SYSTOLE
VENTRICULAR DIASTOLE
5
120
6
Aorta
90
Pressure
(mm Hg)
1
2
3
60
Left
ventricle
4
4
7
5
6
7
30
Left atrium
8
2
1
8
3
0
Left
ventricular
volume (mL)
130
3
End-diastolic
volume
2
1
Stroke
volume
End-systolic
volume
6
50
0
100
200
300
400
Time (msec)
500
600
700
800
Cardiodynamics
Class 3
Figure 20-23 Factors Affecting Stroke Volume.
Step 1
Factors Affecting Stroke Volume (SV)
Venous return (VR)
Filling time (FT)
Increased by
sympathetic
stimulation
Decreased by
parasympathetic
stimulation
Contractility (Cont)
of muscle cells
Preload
End-diastolic
volume (EDV)
End-systolic
volume (ESV)
STROKE VOLUME (SV)
Increased by E, NE,
glucagon,
thyroid hormones
Increased by
vasoconstriction
Decreased by
vasodilation
Afterload (AL)
Figure 20-24b A Summary of the Factors Affecting Cardiac Output.
Factors affecting Factors affecting
heart rate (HR)
stroke volume (SV)
HEART RATE (HR)
STROKE VOLUME (SV) =
CARDIAC OUTPUT (CO) =
b
Factors affecting cardiac output