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Diastolic dysfunction in hypertension
Michel Slama1, Dinko Susic, Jasmina Varagic
1Hypertension Research Laboratories, Division of Research, Ochsner Clinic Foundation, New Orleans, Louisiana 70121, USA. Mslama@ochsner.org
Insights
Hypertension frequently causes heart failure, often linked to diastolic dysfunction. Advanced imaging techniques reveal this dysfunction even in early stages and in individuals with a family history of hypertension.
Area of Science:
- Cardiology
- Hypertension Research
- Cardiovascular Disease
Background:
- Heart failure is a leading cause of cardiovascular morbidity and mortality.
- Hypertension is the primary driver of cardiac failure.
- Diastolic dysfunction is a common finding in hypertensive heart disease.
Purpose of the Study:
- To review current understanding of diastolic function assessment in hypertension.
- To highlight advancements in echocardiographic and other imaging techniques for evaluating diastolic function.
- To discuss the role of myocardial ischemia and fibrosis in hypertensive diastolic dysfunction.
Main Methods:
- Review of invasive and non-invasive methods for assessing diastolic function.
- Focus on echocardiography (Doppler, tissue Doppler, color M-mode) and newer modalities (MRI, cine CT).
- Analysis of E and A waves of mitral flow and ventricular time intervals.
Main Results:
- Diastolic dysfunction is prevalent in hypertensive patients, preceding detectable left ventricular hypertrophy.
- Early diastolic dysfunction can occur in normotensive offspring of hypertensive parents.
- Myocardial ischemia and fibrosis are identified as key contributors to diastolic dysfunction in hypertension.
Conclusions:
- Assessing diastolic function is crucial in managing hypertensive heart disease.
- Advanced imaging techniques provide valuable insights into diastolic dysfunction.
- Understanding the underlying mechanisms, including ischemia and fibrosis, is essential for targeted therapies.
Abstract:
Heart failure is one of the most common causes of cardiovascular morbidity and mortality, and hypertension is the most common cause of cardiac failure. Recent studies have shown that isolated diastolic dysfunction very often accompanies hypertensive heart disease. Ventricular diastolic function may be divided into an active relaxation phase and a passive compliance period. These two components have been investigated invasively, and they remain the gold standards for the study of diastolic function. However, in the routine clinical setting, echocardiographic and Doppler techniques are most useful for evaluating ventricular filling. Thus, analysis of E and A waves of mitral flow have provided important and useful information. Unfortunately, these indices depend on too many factors. Newer indices obtained from ventricular time intervals, tissue Doppler imaging, and color M-mode echocardiography have enhanced the means to assess diastolic function. In addition, new methods including MRI and cine CT have also provided better understanding of left ventricular filling in hypertension. Using these techniques, diastolic dysfunction has been found to be common in patients with hypertension, even before left ventricular hypertrophy is demonstrable and before hypertension in young, normotensive male offspring of hypertensive parents has developed. Furthermore, it has been made clear recently that myocardial ischemia and fibrosis are two important factors associated with diastolic dysfunction in hypertension.