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K Nagatsuka,
S Senda,
S Sakamoto,
T Takagi, H Matsuo,
Y Nitta,
T Inage,
H Yokoi,
H. Suekane,
K Kawanishi,
T Nishimura
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ABSTRACT: The authors studied whether the circadian oscillation of the autonomic nervous system can be evaluated by analysis of heart rate variability derived from 24-hour ambulatory electrocardiograms (Holter ECGs) on healthy subjects, diabetic patients, and hypertensive patients. While the circadian oscillation of the autonomic nervous system was distinct in healthy subjects, it almost disappeared in diabetic patients. Furthermore, the circadian oscillation of the autonomic nervous system was suppressed by α,β blocker administration in hypertensive patients. It is therefore concluded that the circadian oscillation of the autonomic nervous system can be evaluated by analyzing heart rate variability derived from Holter ECG
Systems Engineering, 1992., IEEE International Conference on; 10/1992
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ABSTRACT: The purpose of this study is to characterize regional myocardial alternations of reflected ultrasound throughout a cardiac cycle in normal and ischemic myocardium. Integrated ultrasonic backscatter (2-5 MHz) gated R wave of ECG was measured at the base, middle and apex in 4 dogs, and the apex before and after ischemia in other 4 dogs. Quantitative ultrasonic backscatter (IB) was reflected to a steel reflector. At the apex and middle, where a cyclic pattern of IB was discernible, maximum values were recorded near end diastole and minimum near end systole. The amplitude of the variation of IB throughout a cardiac cycle for each region increase progressively from base to middle to apex. Time-averaged IB over a cardiac cycle (averaged IB) was similar for each area of the heart (base = -50.6 +/- 0.5 dB (mean +/- SE), middle -49.4 +/- 0.5 dB, apex -49.7 +/- 0.6 dB. p = NS for comparison of any two regions). After occluding left anterior descending coronary artery for 30 minutes, the variation of IB was markedly blunted and averaged IB increased significantly (-47.5 +/- 0.5 dB. p less than 0.01 compared with preocclusion (-50.8 +/- 0.5 dB]. These results suggested that IB and averaged IB may permit assessment of intrinsic geometrical changes throughout a cardiac cycle (contractile properties) and histological changes respectively.
Rinsho byori. The Japanese journal of clinical pathology 08/1989; 37(7):819-24.
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Rinsho byori. The Japanese journal of clinical pathology 07/1988; 36(6):725-30.
