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By Michael F. O’Rourke (auth.), M. E. Safar, G. M. London, A. Ch. Simon, Y. A. Weiss (eds.)

The hemodynamic mechanisms of high blood pressure are usually constrained to the examine of 3 dominant parameters: blood strain, cardiac output and vascular resis­ tance. hence, the improvement of high blood pressure is generally analyzed by way of a 'struggle' among cardiac output and vascular resistance, leading to the classical development of standard cardiac output and elevated vascular resistance, therefore indicating a discount within the quality of small arteries. besides the fact that, up to now years, the medical administration of high blood pressure has mostly changed those easy perspectives. whereas an enough keep an eye on of blood strain could be acquired with antihypertensive medicines, arterial problems may well happen, related to more often than not the coronary flow and suggesting that numerous components of the cardiovascular method are altered in high blood pressure. certainly, disturbances within the arterial and the venous method had already been spotted in animal high blood pressure. the elemental assumption during this publication is that the general cardiovascular approach is fascinated about the mechanisms of the increased blood strain in sufferers with high blood pressure: not just the guts and small arteries, but in addition the big arteries and the venous procedure. hence, the subsequent issues are emphasised. First, the cardiovascular procedure in high blood pressure needs to be studied not just when it comes to regular stream but in addition by means of bearing in mind the pulsatile elements of the guts and the arterial structures. moment, arterial and venous compliances are altered in high blood pressure and possibly mirror intrinsic changes of the vascular wall.

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Extra resources for Arterial and Venous Systems in Essential Hypertension

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Go ... 00 Figure 3. Sequence of aortic pulsation and mean aortic caliber changes during the development of a sustained hypertension (subdiaphragmatic aortic constriction) in rats. Pulsation is expressed as dynamic strain (pulsation over diastolic caliber x 100) and mean caliber as mean strain (percent change of mean caliber over the control mean caliber). 8%, respectively. ) mm Hg [30]. Therefore, the sustained distension of the diastolic caliber rather than vessel pulsation is the major determinant of baroreceptor distortion during rapid changes in pressure.

From such data rj and w can then be calculated, also at various levels of distending diastolic pressure [7, 8, 9]. It is, however, technically quite difficult to 25 perform exact pressure-volume estimations on an otherwise intact heart [8, 9] making such evaluations of cardiac geometric design fairly cumbersome. c. General principles of cardiovascular structural adaptation Before going into the particular situation for the resistance vessels in hypertension, it is worthwhile to outline some general principles governing the process of structural adaptation both in heart and vessels.

Acta Physiol Scand 117: 91-97. 29. Folkow B (1986): The structural cardiovascular factor in primary hypertension - pressure dependence and genetic reinforcement. J Hypertension 4 (Supp!. 3): S51-S56. 30. Kanbe T, Nara Y, Tagami M, Yamori Y (1983): Studies of hypertension-induced vascular hypertrophy in cultured smooth musle cells from spontaneously hypertensive rats. Hypertension 5: 887-892. 31. Yamori Y, 19awa T, Tagami M, Kanbe T, Nara Y, Kihara M, Horie R (1984): Humoral trophic influence on cardiovascular structural changes in hypertension.

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