岡山医学会 Acta Medica Okayama 0030-1558 100 1-2 1988 気腹によるベクトル心電図の変化 31 36 EN Ritsuko Terasaka Hiroshi Yamanari Junichiro Togawa Keiko Ihara Naoki Kobiki Hidenori Hagihara Shigeru Matsuno Katashi Matsubara Nobuyuki Yamada Hidenori Yoshida Daiji Saito Shoichi Haraoka Takao Tsuji Vectorcardiograms were recorded with the Frank lead system during laparoscopy. Pneumoperitoneum produced the following significant vectorcardiographic changes: (1) The maximum spatial QRS vector increased in magnitude and shifted horizontally and slightly anteriorly. (2) The L/W ratio of the frontal QRS loop decreased. (3) The scalar data of each X, Y, Z lead of the QRS loop increased. In particular, the increases in R of all three leads and in S of lead Z were significant. These results suggest that the changes in the cardiac anatomic position due to lift of the diaphragma and a decrease of left ventricular end-diastolic volume might produce these vectorcardiographic changes during laparoscopy. No potential conflict of interest relevant to this article was reported.