心弾動図の研究—第II報 高血圧および低血圧の心弾動図について

A Study on Ballistocardiogram.:Report 2: Ballistocardiograms in Hypertension and Hypotension.

I．緒言

　Henderson^1）は1905年に心臓搏動による身体の運動について報告した。その後Starr^2）は心弾動図で異常を示す高血圧及び冠疾患の予後の悪いことを報告している。更にExternal Networkの少ないVon Wittern^3）のテーブルが発表されて以来，心弾動図に関する基礎的，臨床的研究が数多く行われるようになつた。すでに私は所謂健康人の心弾動図について報告^4）したが，この度は吾吾の内科を訪れた本態性高血圧症並びに本態性及び症候性低血圧症の心弾動図について研究した。

Using von Wittern's low-frequency table, ballistocardiograms were recorded in 40 cases of essential hypertension, in 40 cases of essential or symptomatic hypotension and in 40 normal cases. Those having maximal blood pressure over 150 mm Hg or minimal blood pressure over 100mmHg were regarded as hypertensive. Those having maximal blood pressure under 100 mm Hg were regarded as hypotensive. The above mentioned normal cases showed no abnormalities in their blood pressure, 12 lead resting electrocardiograms, chest x-ray films and physical examinations. Another series of 500 ballistocardiograms which had been traced in normal cases by the author¹⁾ were quoted as a control.

The results thus obtaind are as follows:

1) The ballistic abnormalities according to the Brown's classification, the changes of JK waves and the decreased respiratory ratio of amplitude of IJ segments under 50% were observed more frequently in the hypertensive than in the hypotensive and the normal.

2) The amplitudes of IJ and JK, and the time intervals of PH, QH, QI, QJ and QK were mea-sured with the results as the same among all the three groups, P and Q being concerned in electro-cardiograms.

3) There were many cases showing abnormal ballistocardiograms in the hypertensive, irrespective of their normal electrocardiograms.

4) The utility of ballistocardiography must be emphasized, especially for the clinical practice in hypertension and hypotension.