Conduction disturbances after surgical
... et al., 1975; Subramanian, 1976) of complete right bundle-branch block. Similarly, our results show a significantly reduced incidence of complete right bundle-branch block with an atriotomy of 33-3 per cent, compared with 78-9 per cent with a ventriculotomy (P < 0O001). The incidence of left axis de ...
... et al., 1975; Subramanian, 1976) of complete right bundle-branch block. Similarly, our results show a significantly reduced incidence of complete right bundle-branch block with an atriotomy of 33-3 per cent, compared with 78-9 per cent with a ventriculotomy (P < 0O001). The incidence of left axis de ...
this PDF file - Pakistan Heart Journal
... The low cardiac output syndrome (or low output syndrome) is a serious clinical situation of inadequate tissue perfusion due to myocardial dysfunction that often occurs at termination of cardiopulmonary bypass (CPB) or shortly thereafter. It is usually transient and reversible, but persistent LCOS is ...
... The low cardiac output syndrome (or low output syndrome) is a serious clinical situation of inadequate tissue perfusion due to myocardial dysfunction that often occurs at termination of cardiopulmonary bypass (CPB) or shortly thereafter. It is usually transient and reversible, but persistent LCOS is ...
Bradycardia-dependent triggered activity: relevance
... through bipolar electrodes placed on Purkinje fiber strands. Stimuli were rectangular pulses of 2 msec duration and variable frequency and amplitude, delivered from pulse generators triggered by ramp generators through a stimulus isolation unit (Tektronix series 2600). Pacing protocols were similar ...
... through bipolar electrodes placed on Purkinje fiber strands. Stimuli were rectangular pulses of 2 msec duration and variable frequency and amplitude, delivered from pulse generators triggered by ramp generators through a stimulus isolation unit (Tektronix series 2600). Pacing protocols were similar ...
ECG Filtering
... • Its duration, amplitude, and morphology are useful in diagnosing cardiac arrhythmias, ventricular hypertrophy, MI, electrolyte derangement, etc. • Q wave greater than 1/3 the height of the R wave, greater than 0.04 sec are abnormal and may represent MI ...
... • Its duration, amplitude, and morphology are useful in diagnosing cardiac arrhythmias, ventricular hypertrophy, MI, electrolyte derangement, etc. • Q wave greater than 1/3 the height of the R wave, greater than 0.04 sec are abnormal and may represent MI ...
lecture 5
... Discuss the bipolar and un ipolar leads and their locations Discuss the bipolar limb lead and the cardiac axis ...
... Discuss the bipolar and un ipolar leads and their locations Discuss the bipolar limb lead and the cardiac axis ...
New Imaging Technologies To Characterize Arrhythmic
... chamber can be reached and mapped with a mapping catheter.10 In addition to bipolar EGM amplitude, bipolar EGM duration and fractionation were also found in similar early studies to be increased in the presence of scarring because of electrical uncoupling of adjacent myocytes by islands or shards of ...
... chamber can be reached and mapped with a mapping catheter.10 In addition to bipolar EGM amplitude, bipolar EGM duration and fractionation were also found in similar early studies to be increased in the presence of scarring because of electrical uncoupling of adjacent myocytes by islands or shards of ...
A 93-Year-Old Woman with an Abnormal
... increases automaticity and decreases conduction. At the AV junction, at low levels, digoxin slows AV nodal conduction by vagal stimulation. At toxic levels, it appears to act through its direct effects on the sodium pump to prolong the AV nodal refractory period. This direct effect at toxic levels l ...
... increases automaticity and decreases conduction. At the AV junction, at low levels, digoxin slows AV nodal conduction by vagal stimulation. At toxic levels, it appears to act through its direct effects on the sodium pump to prolong the AV nodal refractory period. This direct effect at toxic levels l ...
Nondestructive optical determination of fiber organization in intact
... INTRODUCTION The three-dimensional (3D) organization of myocardial fibers plays a crucial role in the heart’s electrical and mechanical properties. It has been well documented that propagation velocities are several times faster along fibers than in the transverse direction (Panfilov and Keener, 1993; ...
... INTRODUCTION The three-dimensional (3D) organization of myocardial fibers plays a crucial role in the heart’s electrical and mechanical properties. It has been well documented that propagation velocities are several times faster along fibers than in the transverse direction (Panfilov and Keener, 1993; ...
Cardiac Resynchronization: The Flow of Activation Sequence
... U-shaped block, however, was altered on asynchronous pacing. Moreover, the presence of near normal amplitude on unipolar and bipolar electrocardiography excluded the presence of scar tissue, and the presence of fractionated electrocardiographic results suggested that the block was functional and res ...
... U-shaped block, however, was altered on asynchronous pacing. Moreover, the presence of near normal amplitude on unipolar and bipolar electrocardiography excluded the presence of scar tissue, and the presence of fractionated electrocardiographic results suggested that the block was functional and res ...
85 Study of Left Ventricular Diastolic Function in
... towards these two variables but demonstrated no significant statistical value. Early detection of LVDD may have important diagnostic, prognostic and therapeutic implications Limitations of the study Beside DM, there are several other factors which can affect left ventricular diastolic function. We h ...
... towards these two variables but demonstrated no significant statistical value. Early detection of LVDD may have important diagnostic, prognostic and therapeutic implications Limitations of the study Beside DM, there are several other factors which can affect left ventricular diastolic function. We h ...
Cardiac Cycle - OpenStax CNX
... by the closing of the atrioventricular valves during ventricular contraction and is normally described as a lub, or rst heart sound. The second heart sound, S2 , is the sound of the closing of the semilunar valves during ventricular diastole and is described as a dub (Figure 3 (Heart Sounds and ...
... by the closing of the atrioventricular valves during ventricular contraction and is normally described as a lub, or rst heart sound. The second heart sound, S2 , is the sound of the closing of the semilunar valves during ventricular diastole and is described as a dub (Figure 3 (Heart Sounds and ...
His Bundle Electrocardiography
... Note that anomalous QRS complexes terminated longer intervals, while normal QRS complexes terminated shorter intervals. These groupings are incompatible with ventricular aberration of a supraventricular impulse. Numbers indicate cycle lengths in msec. Conventions as in figure 2. Paper speed 10Omm/se ...
... Note that anomalous QRS complexes terminated longer intervals, while normal QRS complexes terminated shorter intervals. These groupings are incompatible with ventricular aberration of a supraventricular impulse. Numbers indicate cycle lengths in msec. Conventions as in figure 2. Paper speed 10Omm/se ...
Single and Dual Chamber Pacemaker Timing Module 6 1
... • Changes in a patient’s disease and/or medications may alter the efficacy of the device’s programmed parameters. Patients should avoid sources of magnetic and electromagnetic radiation to avoid possible underdetection, inappropriate sensing and/or therapy delivery, tissue damage, induction of an ar ...
... • Changes in a patient’s disease and/or medications may alter the efficacy of the device’s programmed parameters. Patients should avoid sources of magnetic and electromagnetic radiation to avoid possible underdetection, inappropriate sensing and/or therapy delivery, tissue damage, induction of an ar ...
Subclinical Left Ventricular Dysfunction in Asymptomatic Type 1
... diabetic children. The major findings can be summarized as: 1) the longitudinal strain can be measured with good reproducibility in normal children and in those with T1D; 2) GLS is significantly reduced in diabetic children; and 3) No correlation was found between GLS and HbA1C however there was a s ...
... diabetic children. The major findings can be summarized as: 1) the longitudinal strain can be measured with good reproducibility in normal children and in those with T1D; 2) GLS is significantly reduced in diabetic children; and 3) No correlation was found between GLS and HbA1C however there was a s ...
Evaluation of right and left ventricular function
... Introduction and aim: The identification of right ventricular abnormalities in patients with arrhythmogenic right ventricular cardiomyopathy (ARVC) in early stages is still difficult. The aim of this study was to investigate if longitudinal strain based on speckle tracking can detect subtle right (R ...
... Introduction and aim: The identification of right ventricular abnormalities in patients with arrhythmogenic right ventricular cardiomyopathy (ARVC) in early stages is still difficult. The aim of this study was to investigate if longitudinal strain based on speckle tracking can detect subtle right (R ...
Acute Myocardial Infarction Complicated With Ventricular
... CARDIOVACULAR MEDICINE 6th edition Chapter 5 pp108 . Our ECG diagnose is different related the authors. Another example of hyperacute phase of extensive anterolateral MI. Marked ST elevation is present across the precordial leads, as well as in leads I and aVL. The QRS complexes have shape very simi ...
... CARDIOVACULAR MEDICINE 6th edition Chapter 5 pp108 . Our ECG diagnose is different related the authors. Another example of hyperacute phase of extensive anterolateral MI. Marked ST elevation is present across the precordial leads, as well as in leads I and aVL. The QRS complexes have shape very simi ...
Predictors of Conversion of Recent‐Onset Atrial Fibrillation Treated
... reduced systolic function and atrial fibrosis evaluated by magnetic resonance imaging, and they even suggest that persistent atrial fibrillation could generate ventricular fibrosis, leading to depressed contractility.11 This feedback between systolic dysfunction and atrial fibrillation makes atrial ...
... reduced systolic function and atrial fibrosis evaluated by magnetic resonance imaging, and they even suggest that persistent atrial fibrillation could generate ventricular fibrosis, leading to depressed contractility.11 This feedback between systolic dysfunction and atrial fibrillation makes atrial ...
Zaporozhye State Medical University
... PAT - paroxysmal atrial tachycardia. Precordial ECG waves - those emanating from chest leads of a 12-lead ECG. P wave - the ECG representation of the electrical impulse going through the atria. PVC - premature ventricular contraction. QRS complex - the letters have no specific meaning; Q, R, and S w ...
... PAT - paroxysmal atrial tachycardia. Precordial ECG waves - those emanating from chest leads of a 12-lead ECG. P wave - the ECG representation of the electrical impulse going through the atria. PVC - premature ventricular contraction. QRS complex - the letters have no specific meaning; Q, R, and S w ...
Mechanical Properties of the Heart Contractility Cardiac Cycle
... - increased Ao pressure rises the coronary perfusion; an increase in the coronary artery pressure is distending the heart from within its walls (stretch), inducing a better shortening of the myocardial fibers ...
... - increased Ao pressure rises the coronary perfusion; an increase in the coronary artery pressure is distending the heart from within its walls (stretch), inducing a better shortening of the myocardial fibers ...
Percutaneous left ventricular assist devices in acute
... The incidence of cardiogenic shock (CS) in patients with AMI ranges from 7 to 10% after acute myocardial infarction (AMI).1,2 Despite aggressive treatment modalities such as percutaneous coronary interventions (PCI) and use of intraaortic balloon support, mortality of CS remains unacceptably high (5 ...
... The incidence of cardiogenic shock (CS) in patients with AMI ranges from 7 to 10% after acute myocardial infarction (AMI).1,2 Despite aggressive treatment modalities such as percutaneous coronary interventions (PCI) and use of intraaortic balloon support, mortality of CS remains unacceptably high (5 ...
... recurring upper airway collapse with ongoing respiratory effort during sleep, causing apnoea, negative intrathoracic pressure, and a fall in arterial oxygen saturation. Cardiac arrhythmias and conduction disturbances are common in OSA patients [1–8], and may be related to increased mortality in this ...
Part 7
... the heart rate.8 Atropine administration should not delay implementation of external pacing for patients with poor perfusion. Use atropine cautiously in the presence of acute coronary ischemia or myocardial infarction; increased heart rate may worsen ischemia or increase the zone of infarction. Atro ...
... the heart rate.8 Atropine administration should not delay implementation of external pacing for patients with poor perfusion. Use atropine cautiously in the presence of acute coronary ischemia or myocardial infarction; increased heart rate may worsen ischemia or increase the zone of infarction. Atro ...
importance of right ventricular end-systolic regional wall stress in
... subjects (N, n = 5). Subjects underwent both gated cardiac magnetic resonance imaging (MRI) of the right ventricle and right heart catheterization (RHC). Using parameters from both the MRI and RHC, an estimate of RV end-systolic relative wall stress (RWS) was calculated. RV RWS was 34.7 ± 8.4 and 17 ...
... subjects (N, n = 5). Subjects underwent both gated cardiac magnetic resonance imaging (MRI) of the right ventricle and right heart catheterization (RHC). Using parameters from both the MRI and RHC, an estimate of RV end-systolic relative wall stress (RWS) was calculated. RV RWS was 34.7 ± 8.4 and 17 ...
PDF version - Heart, Lung and Vessels
... cardiac improvement during left ventricular assist device (LVAD) support after off-pump left ventricular ejection fraction (LVEF) reached its maximum value of 50%. At the time of maximum LVEF improvement (images A and B) longitudinal global systolic strain (SL) and strain-rate (SrL) were slightly re ...
... cardiac improvement during left ventricular assist device (LVAD) support after off-pump left ventricular ejection fraction (LVEF) reached its maximum value of 50%. At the time of maximum LVEF improvement (images A and B) longitudinal global systolic strain (SL) and strain-rate (SrL) were slightly re ...
Ventricular fibrillation
Ventricular fibrillation (V-fib or VF) is a condition in which there is uncoordinated contraction of the cardiac muscle of the ventricles in the heart, making them quiver rather than contract properly. Ventricular fibrillation is the most commonly identified arrhythmia in cardiac arrest patients. While there is some activity, the lay person is usually unable to detect it by palpating (feeling) the major pulse points of the carotid and femoral arteries. Such an arrhythmia is only confirmed by electrocardiography. Ventricular fibrillation is a medical emergency that requires prompt Advanced Life Support interventions. If this arrhythmia continues for more than a few seconds, it will likely degenerate further into asystole (""flatline""). This condition results in cardiogenic shock and cessation of effective blood circulation. As a consequence, sudden cardiac death (SCD) will result in a matter of minutes. If the patient is not revived after a sufficient period (within roughly 5 minutes at room temperature), the patient could sustain irreversible brain damage and possibly become brain-dead, due to the effects of cerebral hypoxia. On the other hand, death often occurs if sinus rhythm is not restored within 90 seconds of the onset of VF, especially if it has degenerated further into asystole.