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Variabilities of blood pressure respiration and heart rate during sleep in patients with ischemic heart disease and arrhythmia observation by continuous recording of direct arterial pressure and others using telemetric method



Variabilities of blood pressure respiration and heart rate during sleep in patients with ischemic heart disease and arrhythmia observation by continuous recording of direct arterial pressure and others using telemetric method



Yokohama Medical Journal 36(3): 189-199



Direct arterial blood pressure, heart rate, respiratory state and transdermal arterial O2 saturation were measured in 43 patients with heart diseases and 8 normal subjects when they were sleeping. There were stable phase and spontaneously fluctuating phase of blood pressure (SFP), and a concomitant variability of both BP (mean value of systolic BP change during SFP; 23.5 .+-. 1.5 mmHg) and respiratory amplitude were observed in a cyclic fashion in 59% of the subjects. The .DELTA.SBP during SFP was significantly correlated with the age (r=0.48, P < 0.05), but not correlated with indices of cardiac function (mVcf, ejection fraction and cardiac index as estimated from the echocardiogram). The .DELTA.SBP in patients with angina pectoris was significantly higher than that in normal subjects (P < 0.05), although there was no significant difference in the ages of the 2 groups. There seems to be a regular incidence of premature ventricular contractions in accordance with the variabilities of blood pressure and concomitant changes of respiratory amplitude. Such a relationship was recognized in 5 patients. Apparently, the degree of blood pressure change during SFP is partly dependent on the age, and on the changing tone of autonomic nervous system as a whole. Such changes are probably related to the incidence of angina pectoris and/or arrhythmia along with those influences exerted by the pathophysiology of these diseases.

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