Diastolic Function and Its Importance in Cardiac Health

Introduction to Diastolic Function

The European Society of Cardiology recommends that adequate diastole is critical for optimal cardiac function as it enables proper ventricular filling, maintains normal stroke volume, and prevents elevated filling pressures that could lead to pulmonary congestion and heart failure symptoms 1, 2

Coronary perfusion occurs almost exclusively during diastole, making adequate diastolic time essential for coronary blood flow, as stated by the American Heart Association 3

The American College of Cardiology notes that proper diastolic function maintains a delicate balance between filling pressures, with adequate diastole preventing elevated left ventricular filling pressures, left atrial pressure, and pulmonary venous pressure 4, 5
The American College of Cardiology also states that diastolic function ensures sufficient ventricular filling to maintain stroke volume, particularly during increased demand (e.g., exercise) 5
The American Heart Association recommends that maintaining coronary blood flow through adequate diastolic time and pressure is crucial for cardiac health 3

The European Society of Cardiology recommends that normal diastolic response to exercise includes enhanced myocardial relaxation, with normal subjects increasing stroke volume without significantly increasing filling pressures due to augmented relaxation and early diastolic suction 2
The European Society of Cardiology also notes that in healthy individuals, both mitral E velocity and annular e' velocity increase proportionally during exercise, maintaining a stable E/e' ratio 2
The European Society of Cardiology states that the faster the myocardial relaxation (e' velocity), the higher the exercise capacity 2

The European Society of Cardiology notes that impaired diastolic function leads to elevated filling pressures, with patients with diastolic dysfunction only able to achieve required cardiac output at the expense of increased left ventricular filling pressures 2
The European Society of Cardiology also states that diastolic dysfunction limits the ability to augment cardiac output during exercise, resulting in reduced exercise tolerance 6, 2
The American College of Cardiology recommends that elevated filling pressures can lead to pulmonary venous congestion and symptoms of dyspnea 4, 5
The American College of Cardiology notes that approximately 30% of heart failure patients have normal systolic function but predominantly diastolic dysfunction 4

The European Society of Cardiology recommends that diastolic function can be evaluated through echocardiography, with key parameters including mitral inflow velocities, mitral annular e' velocity, E/e' ratio, tricuspid regurgitation velocity, and left atrial volume index 7, 2
The European Society of Cardiology also notes that diastolic stress testing is particularly valuable when resting echocardiography doesn't explain symptoms of dyspnea or heart failure, especially with exertion 6, 2

The European Society of Cardiology states that myocardial ischemia consistently reduces ventricular relaxation in patients with coronary artery disease 2
The European Society of Cardiology notes that hypertensive heart disease impairs diastolic function 2

The American College of Cardiology recommends that diuretics be used judiciously to reduce elevated filling pressures without significantly reducing cardiac output 8
The American College of Cardiology also notes that nitrates help lower elevated filling pressures 8
The American College of Cardiology recommends that rate control, using drugs that suppress AV conduction, can control ventricular rate in patients with atrial fibrillation 8
The American College of Cardiology states that calcium channel blockers and beta-blockers may improve diastolic filling by reducing heart rate and potentially augmenting ventricular relaxation 8
The American College of Cardiology notes that ACE inhibitors are frequently used, though studies demonstrating their effectiveness specifically for diastolic dysfunction are limited 8

The European Society of Cardiology recommends that heart rate effects, such as fusion of E and A velocities at higher heart rates, can complicate assessment 2
The European Society of Cardiology notes that conduction abnormalities, such as left bundle branch block, right ventricular pacing, and cardiac resynchronization therapy, reduce the accuracy of diastolic parameters 2
The European Society of Cardiology states that significant mitral valve disease can confound diastolic assessment 2