["Diastolic" heart failure and pulsed pressure].
Cardiac failure is the leading cause of hospital admission after 65 years of age. Several studies have confirmed the frequency of cardiac failure with normal systolic function ("diastolic" cardiac failure) in the elderly (nearly half the cases). The cause is commonly isolated systolic hypertension. The pulsed pressure depends on ventricular ejection, arterial rigidity and the precocity of reflected pulse waves. In the elderly, the pulse pressure is a powerful predictive factor for mortality and adverse cardiovascular events (acute coronary syndromes, cardiac failure and cerebrovascular accidents). Patients with isolated systolic hypertension or an increased pulsed pressure usually have left ventricular hypertrophy or concentric remodelling, abnormal relaxation, alteration of hypertrophied myocytes with increased myocardial oxygen consumption and subendocardial ischaemia, especially when the coronary reserve is reduced. The decrease of the diastolic blood pressure reduces the presence of coronary perfusion. Moreover, an increase in the pulsed pressure predisposes to coronary atherosclerosis. These patients are very symptomatic on exercise because they do not have a reserve of preload and easily develop acute pulmonary oedema after a volume overload (increased salt intake, postoperative rehydratation). A recent study showed that the left ventricular ejection fraction was preserved during acute pulmonary oedema of hypertensive patients. The diagnosis of "diastolic" cardiac failure is often suspected by elimination (clinical signs of cardiac failure with a normal left ventricular ejection fraction), and echographers have proposed many criteria to detect abnormal relaxation, filling or distensibility of the left ventricle. Mortality would seem to be half that of systolic cardiac failure. Treatment should normalise the hypertension, ischaemia, tachycardia, and maintain or reestablish sinus rhythm, but it remains empirical.
Aumont
M C
MC
Service de cardiologie, hôpital Bichat, 46, rue Henri Huchard, 75877 Paris.
Morisson-Castagnet
J F
JF
D001794:Blood Pressure; D006333:Heart Failure / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology* / Q000628:therapy; D006801:Humans