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Titolo:
LARGE ARTERY FUNCTION AND ALTERATIONS IN HYPERTENSION
Autore:
LONDON GM;
Indirizzi:
HOP F H MANHES,8 GRANDE RUE F-91700 FLEURY MEROGIS FRANCE F H MANHES HOSP CTR FLEURY MEROGIS FRANCE
Titolo Testata:
Journal of hypertension
, volume: 13, anno: 1995, supplemento:, 2
pagine: 35 - 38
SICI:
0263-6352(1995)13:<35:LAFAAI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONVERTING ENZYME-INHIBITION; CARDIAC-HYPERTROPHY; WAVE REFLECTIONS; CHRONIC UREMIA; PRESSURE;
Keywords:
HYPERTENSION; PULSE WAVE VELOCITY; ARTERIAL STIFFNESS; AGING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
G.M. London, "LARGE ARTERY FUNCTION AND ALTERATIONS IN HYPERTENSION", Journal of hypertension, 13, 1995, pp. 35-38

Abstract

Hypertension and arterial hemodynamics: One of the characteristics ofhypertension is an impairment in arterial hemodynamics. Any definition of hypertension has to take account of oscillatory fluctuations during the cardiac cycle, that is, fluctuations in systolic and diastolic blood pressure around mean arterial pressure. These fluctuations are determined by ventricular ejection, arterial distensibility and the timing of arterial wave reflections. Effects of aging on large arteries: Larger arteries stiffen progressively with age, due to medial and intimal thickening. This alteration can be described as a decrease in arterial distensibility (Di = Delta D/Delta P x D, where D is the diameterof the artery and P is the blood pressure). The most obvious consequence of arterial stiffening is an increase in the amplitude of pulse pressure, caused by an increase in systolic pressure and a decrease in diastolic pressure. Two mechanisms underlie this increase in pulse pressure: a higher incident pressure wave generated by the left ventricle into a stiffened aorta and an increase in the velocity of the pressurewave traveling forward and back in the arterial tree. In young subjects, the reflected wave causes an increase in the early diastolic wave,but in older people the reflected wave is summed with a late systolicwave, causing a dramatic increase in central systolic pressure. Thesephenomena affect left ventricular function adversely, increasing myocardial oxygen consumption and tending to decrease coronary blood flow. Furthermore, the increased systolic blood pressure induces left ventricular hypertrophy. Effects of antihypertensive drugs: Although all classes of antihypertensive drugs can reduce blood pressure, only some can decrease arterial distensibility. Angiotensin converting enzyme inhibitors and calcium antagonists have been shown to decrease the stiffness of conduit arteries and dilate peripheral arteries. This may account for the superiority of these drugs in regressing left ventricular hypertrophy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:56:58