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Biography

Peter de Leeuw is emeritus professor of Medicine at the Maastricht University Medical Center. His clinical and research interest goes to vascular me-dicine with particular reference to hypertension and related disorders. He has published over 700 papers on hemodynamics, neurohumoral abnor-malities and drug treatment in hypertension. Most recently, he has been involved with baroreceptor stimulation as a novel treatment of resistant hy-pertension. He has been President of the Dutch Hypertension Society and a Council Member of the International Society of Hypertension. Moreover, he has been Editor-in-Chief of three medical journals in internal medicine.

Abstract

Introduction: From a hemodynamic point of view, hypertension may be caused by an increase in cardiac output and/or peripheral vascular resistance. In addition, volume status and the degree of vascular stiffness determine the height of blood pressure. When hypertension is found during preg-nancy (HDPs), all these pathophysiological phenomena may play a role but the pattern is far from homogeneous. First, it makes a difference whether hypertension was pre-existent or induced by the pregnancy. Secondly, it is important to consider that HDP may involve as a spon-taneous disorder in an otherwise healthy woman or be superimposed upon another ‘silent’ underlying abnormality.

Pathophysiological considerations: In pregnancy-related hypertension we usually find a lower cardiac output, increased vascular resistance, increased arterial stiffness and a reduced plasma volume. The activity of the renin-angiotensin system is suppressed as well. This suggests that there is a hypertensive stimulus which leads to a compensatory reduction in pressor systems. The fact that sympathetic activity is activated rather than suppressed can be seen as an attempt to ‘keep the circulation going’.

Pathophysiology-based management: The most appropriate approach to the patient with a HDP is to direct treatment to those factors that could initiate or exacerbate a rise in pressure. Recent evidence suggests that a substantial proportion of women with preeclampsia - a common form of HDP - have renal vascular abnormalities, either as a pattern of intrarenal nephrosclerosis or, and perhaps more often, as macrovascular disease, notably fibromus-cular dysplasia.

References:

  1. Vance CJ et al. Increased prevalence of preeclampsia among wo-men undergoing procedural intervention for renal artery fibro-muscular dysplasia. Ann Vasc Surg 2015; 29: 1105.
  1. Spaanderman ME et al, The effect of pregnancy on the compliance of large arteries and veins in normal parous controls and formerly preeclamptics. Am J Obstet Gynecol 2000; 183: 1278.
  1. Abalos E et al. Antihypertensive drug therapy for mild to mode-rate hypertension during pregnancy. Cochrane Database Syst Rev. 2014 Feb6;(2): CD002252.
  1. Van Twist DJ et al. Renal hemodynamics and renin-angiotensin sys-tem activity in humans with multifocal renal artery fibromuscular dysplasia. J Hypertens 2016; 34: 1160.
  1. De Leeuw PW et al. Bilateral or unilateral stimulation for baroreflex activation therapy. Hypertension 2015; 65: 187.