[Baroreceptor regulation of arterial pressure in elderly patients with systolic and essential hypertension].
OBJECTIVE
To study efficiency of baroreceptor regulation of circulation with reference to vegetative regulation of the heart (VRH) and 24-h rhythms of blood pressure (BP) in elderly patients with systolic hypertension (SH) and essential hypertension (EH).


METHODS
Synchronous 24-h monitoring of BP, ECG with evaluation of VRH by the system Cardio Tens 01 (Meditech, Hungary), examination of BP baroreceptor regulation from carotid areas with the method "cervical Camera" and in performing active orthostatic test were conducted in 50 elderly patients with mild and moderate SH and EH.


RESULTS
Weakening of BP baroresponse was more noticeable in SH patients than in EH patients though the cardiochronotropic component of baroreflex in EH was stronger. Stimulation of the carotid baroreflex by elevated BP is accompanied by different weakening of adrenergic efferentation depending on AH form. The results of testing baroreflex by BP reduction in the group of SH patients point to the absence of efficient reactions of systemic circulation. In EH, circulation reacts extra actively. The condition of the cardiovascular system in SH is characterized by marked amplitude hypertension and asynchronous 24-h rhythm of vegetative impacts on the myocardium in the presence of subnormal afferentation of carotid receptors.


CONCLUSIONS
The baroreflex control of the cardiovascular system in various forms of AH differs from that of normotensive subjects. The baroreflex and parameters of 24-h profile of AP and VRH are correlated.
B I
BI
Gel'tser
V N
VN
Kotel'nikov
M V
MV
Bobyleva
D000368:Aged; D017704:Baroreflex; D001794:Blood Pressure; D018660:Blood Pressure Monitoring, Ambulatory; D002940:Circadian Rhythm; D003971:Diastole; D005260:Female; D006439:Hemodynamics; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D008297:Male; D011311:Pressoreceptors / Q000503:physiopathology*; D013599:Systole