document
... • These are unidirectional valves that allow blood flow in only one direction. • They prevent blood from flowing back to the chamber that it has just left. ...
... • These are unidirectional valves that allow blood flow in only one direction. • They prevent blood from flowing back to the chamber that it has just left. ...
Wall Thickness and Diastolic Properties of the Left Ventricle
... from the present data that within the population of all patients exhibiting LVH by ECG criteria, wall thickness acts as a further and independent predictor of stiffness. This is supported by the observation that even in the absence of LVH, increased h1, was associated with increased S, as noted in p ...
... from the present data that within the population of all patients exhibiting LVH by ECG criteria, wall thickness acts as a further and independent predictor of stiffness. This is supported by the observation that even in the absence of LVH, increased h1, was associated with increased S, as noted in p ...
PVC project
... The sinus impulse following the PVC may be conducted with a longer PR interval because of retrograde concealed conduction by the PVC into the AV junction slowing subsequent conduction of the sinus impulse. ...
... The sinus impulse following the PVC may be conducted with a longer PR interval because of retrograde concealed conduction by the PVC into the AV junction slowing subsequent conduction of the sinus impulse. ...
Effects of Spontaneous Respiration on Canine
... increases the capacitance of the pulmonary vessels and decreases the filling of the left ventricle (Charlier, 1967; Hoffman et al, 1965; Ruskin et al, 1973). Still others have considered that left ventricular filling is decreased because of compression of the left ventricle from the enlarging right ...
... increases the capacitance of the pulmonary vessels and decreases the filling of the left ventricle (Charlier, 1967; Hoffman et al, 1965; Ruskin et al, 1973). Still others have considered that left ventricular filling is decreased because of compression of the left ventricle from the enlarging right ...
Low pressure giant pulmonary artery aneurysms in the adult: natural
... Clagett reported only eight cases in a review of 109 571 necropsies.2 Aggressive surgical approaches have often been advocated based on previous reports of dissection or rupture. Pulmonary artery aneurysms, even when very large, in the presence of low pulmonary pressures and the absence of left to r ...
... Clagett reported only eight cases in a review of 109 571 necropsies.2 Aggressive surgical approaches have often been advocated based on previous reports of dissection or rupture. Pulmonary artery aneurysms, even when very large, in the presence of low pulmonary pressures and the absence of left to r ...
File
... • Whole of conducting system of heart except part of lts branch of AV bundle • SA Node –supplied by LCA (40%) ...
... • Whole of conducting system of heart except part of lts branch of AV bundle • SA Node –supplied by LCA (40%) ...
C:\Documents and Settings\Reb...uhi.default\Cache\0F1E60D5d01
... Regional inhomogeneities in contractility and mechanical restitution may serve as foci for stretch-induced arrhythmias (SIAs). These inhomogeneities can be attributed to localized ischemia (12, 42) or hypertrophy localized to various regions on the ventricular free wall and septum (11). Such inhomog ...
... Regional inhomogeneities in contractility and mechanical restitution may serve as foci for stretch-induced arrhythmias (SIAs). These inhomogeneities can be attributed to localized ischemia (12, 42) or hypertrophy localized to various regions on the ventricular free wall and septum (11). Such inhomog ...
File
... • Whole of conducting system of heart except part of lts branch of AV bundle • SA Node –supplied by LCA (40%) ...
... • Whole of conducting system of heart except part of lts branch of AV bundle • SA Node –supplied by LCA (40%) ...
Назва наукового напрямку (модуля): Семестр: 4 Модуль 4 Цикл
... Basal departments of the heart It is known, that a QRS complex represents the process of distribution of depolarization wave on right and left ventricles. Excitation of what area of ventricles is characterized by the S indent? Superior and middle third of an interventricular septum Middle and inferi ...
... Basal departments of the heart It is known, that a QRS complex represents the process of distribution of depolarization wave on right and left ventricles. Excitation of what area of ventricles is characterized by the S indent? Superior and middle third of an interventricular septum Middle and inferi ...
Temporary Pacing power point education
... • Determine underlying rhythm and document – This can be done when you are determining pacing threshold – By turning down the mA to below the pacing threshold, the patient’s intrinsic rhythm will become apparent ...
... • Determine underlying rhythm and document – This can be done when you are determining pacing threshold – By turning down the mA to below the pacing threshold, the patient’s intrinsic rhythm will become apparent ...
Assessment of Cardiac Murmurs in Children
... Attention should be paid toward allaying the anxiety of the people concerned rather than concentrating on the murmur itself. It is necessary to emphasise that this extra sound does not signify the presence of any underlying heart disease. As such, the child Bulletin 5; September 1998 ...
... Attention should be paid toward allaying the anxiety of the people concerned rather than concentrating on the murmur itself. It is necessary to emphasise that this extra sound does not signify the presence of any underlying heart disease. As such, the child Bulletin 5; September 1998 ...
Review Article Ventricular Tachycardia in the Absence of Structural
... Exercise stress testing is used frequently to initiate and evaluate RVOT VT (unlike RV monomorphic extrasystoles, which are suppressed by sinus tachycardia) but is not clinically helpful in most cases. Initiation of the tachycardia depends on a critical heart rate that differs in each patient. The V ...
... Exercise stress testing is used frequently to initiate and evaluate RVOT VT (unlike RV monomorphic extrasystoles, which are suppressed by sinus tachycardia) but is not clinically helpful in most cases. Initiation of the tachycardia depends on a critical heart rate that differs in each patient. The V ...
Right ventricular cardiac myxoma. Histopathology diagnosis in
... Right atrial myxomas may mimic constrictive pericarditis by producing functional stenosis of the tricuspid valve, with increased right atrial pressure [35,36,39]. Ventricular myxomas may mimic stenosis of the aortic or pulmonic valve because of the narrowing of the left or right ventricular outflow ...
... Right atrial myxomas may mimic constrictive pericarditis by producing functional stenosis of the tricuspid valve, with increased right atrial pressure [35,36,39]. Ventricular myxomas may mimic stenosis of the aortic or pulmonic valve because of the narrowing of the left or right ventricular outflow ...
Non-coronary sinus of Valsalva aneurysm diagnosed after a road
... the interventricular septum leading to malignant arrhythmias and conduction disturbances, an intramural thrombus causing obstruction of coronary ostia, and myocardial ischaemia.7 Ruptures in non-congenital cases are usually fatal, and occur in the pericardial or pleural cavity and, less frequently, ...
... the interventricular septum leading to malignant arrhythmias and conduction disturbances, an intramural thrombus causing obstruction of coronary ostia, and myocardial ischaemia.7 Ruptures in non-congenital cases are usually fatal, and occur in the pericardial or pleural cavity and, less frequently, ...
Na/K pump regulation of cardiac repolarization
... As mentioned earlier, the mathematical descriptions of the cardiac Na/K pump current have been integrated in a variety of models of cardiac cell electrophysiology. Computational studies using the cellular models have allowed quantification of the specific role of the pump in cardiac electrophysiolog ...
... As mentioned earlier, the mathematical descriptions of the cardiac Na/K pump current have been integrated in a variety of models of cardiac cell electrophysiology. Computational studies using the cellular models have allowed quantification of the specific role of the pump in cardiac electrophysiolog ...
Can heart rate variability become a screening tool for
... analysis for the same data are also included by Fujiwara et al. (13), for reference. Analysis of entropy is a mathematically different approach from FFT, which has among other things, the superficial advantage of being very simple in its result, and apparently lesser amounts of HRV data needed for a ...
... analysis for the same data are also included by Fujiwara et al. (13), for reference. Analysis of entropy is a mathematically different approach from FFT, which has among other things, the superficial advantage of being very simple in its result, and apparently lesser amounts of HRV data needed for a ...
1 introduction - Jyväskylän yliopisto
... We could also say that heart muscle is a syncytium of many cells thus forming an atrial syncytium and a ventricular syncytium. The atria are separated from the ventricles by fibrous tissue surrounding the area of valvular openings. This is the reason why electric potentials are not conducted from th ...
... We could also say that heart muscle is a syncytium of many cells thus forming an atrial syncytium and a ventricular syncytium. The atria are separated from the ventricles by fibrous tissue surrounding the area of valvular openings. This is the reason why electric potentials are not conducted from th ...
030814 Acute Cardiac Tamponade - Ether
... Cardiac catheterization will show equilibration of average diastolic pressure and characteristic respiratory reciprocation of cardiac pressures: an inspiratory increase on the right and a concomitant decrease on the left — the proximate cause of pulsus paradoxus. Except in low-pressure tamponade, di ...
... Cardiac catheterization will show equilibration of average diastolic pressure and characteristic respiratory reciprocation of cardiac pressures: an inspiratory increase on the right and a concomitant decrease on the left — the proximate cause of pulsus paradoxus. Except in low-pressure tamponade, di ...
Full text (PDF file)
... primarily the intra-ventricular synchrony with a potential beneficial impact also on the interventricular synchrony. The optimal V-V interval (designated as A) was predicted based on the determination of the onsets of deformation of individual LV segments using strain-rate Doppler tissue echocardiog ...
... primarily the intra-ventricular synchrony with a potential beneficial impact also on the interventricular synchrony. The optimal V-V interval (designated as A) was predicted based on the determination of the onsets of deformation of individual LV segments using strain-rate Doppler tissue echocardiog ...
Estimation of left ventricular operating stiffness from - AJP
... suspended ventilation before cardiopulmonary bypass, during partial (1.5–2 l/min) cardiopulmonary bypass, and after surgery. Ventilation was suspended for at most 20–30 s at a time during which time data collection was performed. All patients had continuous routine oxygen saturation monitoring, and ...
... suspended ventilation before cardiopulmonary bypass, during partial (1.5–2 l/min) cardiopulmonary bypass, and after surgery. Ventilation was suspended for at most 20–30 s at a time during which time data collection was performed. All patients had continuous routine oxygen saturation monitoring, and ...
Cardiac electrophysiology
... will increase the heart rate and potentially cause palpitations or tachycardias. Causes include stress, ingested or injected substances (ie: caffeine, amphetamines, alcohol—see Holiday heart syndrome), and an overactive thyroid gland (hyperthyroidism). Individuals who have a tachycardia are often ad ...
... will increase the heart rate and potentially cause palpitations or tachycardias. Causes include stress, ingested or injected substances (ie: caffeine, amphetamines, alcohol—see Holiday heart syndrome), and an overactive thyroid gland (hyperthyroidism). Individuals who have a tachycardia are often ad ...
How to use echo-Doppler in clinical trials: different modalities for
... The assessment of regional wall function is often performed by visual, semiquantitative analysis (scoring) of both inward endocardial motion and myocardial thickening.3 A 17-segment model of the left ventricle has been proposed by the American Heart Association in order to obtain a standardized myoc ...
... The assessment of regional wall function is often performed by visual, semiquantitative analysis (scoring) of both inward endocardial motion and myocardial thickening.3 A 17-segment model of the left ventricle has been proposed by the American Heart Association in order to obtain a standardized myoc ...
PAUL M. ZOLL, M.D. Invasive Temporary Pacing
... o~ electro~echanical coupling in the myocardIum. StImulation with the NTP is usually effective and usually comfortable or tolerable for' most conscious subjects (about 90%) at threshold levels between 40 and 70 mA.19 Thresholds as low as 20 mA have rarely been observed, but levels up to and above th ...
... o~ electro~echanical coupling in the myocardIum. StImulation with the NTP is usually effective and usually comfortable or tolerable for' most conscious subjects (about 90%) at threshold levels between 40 and 70 mA.19 Thresholds as low as 20 mA have rarely been observed, but levels up to and above th ...
Fig. 33-3: Top
... Referred to as the “silent killer” because patients are frequently asymptomatic until target organ disease occurs ...
... Referred to as the “silent killer” because patients are frequently asymptomatic until target organ disease occurs ...
Shortcut to Electrocardiography
... Hypertrophy refers to the increase muscle mass. Caused by the pressure overload in which the heart is forced to pump blood against an increased resistance. E.g., in long term hypertension and aortic stenosis. Enlargement refers to dilatation of a particular chamber. Caused by volume overload. The ch ...
... Hypertrophy refers to the increase muscle mass. Caused by the pressure overload in which the heart is forced to pump blood against an increased resistance. E.g., in long term hypertension and aortic stenosis. Enlargement refers to dilatation of a particular chamber. Caused by volume overload. The ch ...
Heart failure
Heart failure (HF), often referred to as congestive heart failure (CHF), occurs when the heart is unable to pump sufficiently to maintain blood flow to meet the body's needs. The terms chronic heart failure (CHF) or congestive cardiac failure (CCF) are often used interchangeably with congestive heart failure. Signs and symptoms commonly include shortness of breath, excessive tiredness, and leg swelling. The shortness of breath is usually worse with exercise, while lying down, and may wake the person at night. A limited ability to exercise is also a common feature.Common causes of heart failure include coronary artery disease including a previous myocardial infarction (heart attack), high blood pressure, atrial fibrillation, valvular heart disease, excess alcohol use, infection, and cardiomyopathy of an unknown cause. These cause heart failure by changing either the structure or the functioning of the heart. There are two main types of heart failure: heart failure due to left ventricular dysfunction and heart failure with normal ejection fraction depending on if the ability of the left ventricle to contract is affected, or the heart's ability to relax. The severity of disease is usually graded by the degree of problems with exercise. Heart failure is not the same as myocardial infarction (in which part of the heart muscle dies) or cardiac arrest (in which blood flow stops altogether). Other diseases that may have symptoms similar to heart failure include obesity, kidney failure, liver problems, anemia and thyroid disease.The condition is diagnosed based on the history of the symptoms and a physical examination with confirmation by echocardiography. Blood tests, electrocardiography, and chest radiography may be useful to determine the underlying cause. Treatment depends on the severity and cause of the disease. In people with chronic stable mild heart failure, treatment commonly consists of lifestyle modifications such as stopping smoking, physical exercise, and dietary changes, as well as medications. In those with heart failure due to left ventricular dysfunction, angiotensin converting enzyme inhibitors or angiotensin receptor blockers along with beta blockers are recommended. For those with severe disease, aldosterone antagonists, or hydralazine plus a nitrate may be used. Diuretics are useful for preventing fluid retention. Sometimes, depending on the cause, an implanted device such as a pacemaker or an implantable cardiac defibrillator may be recommended. In some moderate or severe cases cardiac resynchronization therapy (CRT) may be suggested or cardiac contractility modulation may be of benefit. A ventricular assist device or occasionally a heart transplant may be recommended in those with severe disease despite all other measures.Heart failure is a common, costly, and potentially fatal condition. In developed countries, around 2% of adults have heart failure and in those over the age of 65, this increases to 6–10%. In the year after diagnosis the risk of death is about 35% after which it decreases to below 10% each year. This is similar to the risks with a number of types of cancer. In the United Kingdom the disease is the reason for 5% of emergency hospital admissions. Heart failure has been known since ancient times with the Ebers papyrus commenting on it around 1550 BCE.