Shimazaki T, Katho K, Watanabe T, Hasegewa T, Tatsuta T, Nagamine K, Okitsu M, Shimada J, Yamamoto Y
First Department of Oral Surgery, Meikai University School of Dentistry, Saitama, Japan.
Meikai Daigaku Shigaku Zasshi. 1990;19(1):74-9.
The rate x pressure product is a product of the systolic blood pressure and heart rate and is widely used in clinical medicine as an index of the cardiac oxygen supply-demand balance. Employing 20 healthy male subjects, we studied the changes in the rate x pressure product due to a body position change from the sitting position to the supine position in a dental chair. The following results were obtained: 1. The change from the sitting position caused a 10% decrease in the rate x pressure product, and this value did not return to the initial sitting position value even after 5 min in the supine position. 2. The heart rate tended to decrease due to the position change. 3. Immediately after the position change, the systolic blood pressure decreased significantly (p less than 0.05), but it tended to return to the initial value with the lapse of time. The lower rate x pressure product in the supine position suggests that the supine position is more advantageous than the sitting one in treatment of the elderly and patients with cardiovascular diseases from the viewpoint of the systemic cardiovascular kinetics.
速率×压力乘积是收缩压与心率的乘积，在临床医学中广泛用作心脏氧供需平衡的指标。我们选取了20名健康男性受试者，研究了在牙科椅上从坐姿变为仰卧位时速率×压力乘积的变化。得到以下结果：1. 从坐姿改变导致速率×压力乘积下降10%，即使在仰卧位5分钟后该值也未恢复到初始坐姿值。2. 心率因体位改变而趋于下降。3. 体位改变后立即收缩压显著下降（p<0.05），但随着时间推移有恢复到初始值的趋势。仰卧位时较低的速率×压力乘积表明，从全身心血管动力学角度来看，仰卧位在治疗老年人和心血管疾病患者方面比坐姿更具优势。
