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[Hemodynamic importance of the left atrium in patients with essential hypertension]
Insights
Essential hypertension significantly increases left atrial size and impacts left atrial hemodynamics. Echocardiography reveals diminished diastolic function in hypertensive patients, even with normal systolic function.
Area of Science:
- Cardiology
- Hypertension Research
- Cardiac Physiology
Context:
- Essential hypertension affects cardiovascular structure and function.
- Left atrial size and function are crucial indicators of cardiac health.
- Assessing left ventricular diastolic function is vital in hypertensive patients.
Purpose:
- To investigate the impact of essential hypertension on left atrial size and hemodynamics.
- To evaluate left ventricular systolic and diastolic function in hypertensive individuals.
- To determine the clinical utility of echocardiography in assessing hypertensive heart disease.
Summary:
- Echocardiographic and polycardiographic examinations of 29 hypertensive patients and 37 healthy controls revealed significantly larger left atrial size and proportion of left atrial systole in hemodynamics among hypertensives.
- While left ventricular systolic function parameters were comparable, diastolic function parameters were significantly reduced in hypertensive patients.
- Left atrial assessment complements clinical evaluation, particularly when left ventricular global systolic function is normal but diastolic function is impaired.
Impact:
- Highlights the role of left atrial abnormalities in essential hypertension.
- Underscores the importance of evaluating diastolic function in hypertensive patients.
- Suggests limitations of electrocardiographic criteria (Morris's index, 4th heart sound) in assessing hypertension severity and emphasizes the need for consistent interpretation of the 4th heart sound.
Abstract:
Twenty-nine patients with essential hypertension and thirty-seven without cardiac disease were examined electrocardiographically, polycardiographically and echocardiographically. Both the proportion of the left atrial systole in the hemodynamics and the size of the left atrium were significantly greater in hypertonics compared to healthy subjects. The parameters of left ventricular systolic function did not differ significantly, the parameters of diastolic function were significantly lower in hypertonics. Evaluation of the size and function of the left atrium supplements the clinical assessment of the functional state of the left ventricle at a period of its normal global systolic function but diminished diastolic function. The insufficient informative value of the electrocardiographic criteria of changes in the size of the left atrium (so-called Morris's index) and of the presence of the 4th heart sound in evaluating the severity of hypertension is pointed out. Since the presence of the 4th heart sound is clinically incorrectly interpreted, the need for consistency in its interpretation is emphasized.