大倉 宏之　, 吉川 純一, 吉田 清, 赤阪 隆史, 赤土 正洋, 高木 力, 三宅 仁

Hiroyuki OKURA, Junichi YOSHIKAWA, Kiyoshi YOSHIDA, Takashi AKASAKA, Masahiro SHAKUDO, Tsutomu TAKAGI, Shinobu MIYAKE

神戸市立中央市民病院循環器センター内科

Department of Cardiology, Kobe General Hospital

キーワード : Tricuspid regurgitant orifice area, Proximal isovelocity surface area method, Tricuspid regurgitation

We assessed the changes in the tricuspid regurgitant orifice area in sixteen cases with secondary tricuspid regurgitation using the color Doppler flow proximal isovelocity surface area method. In nine instants, we calculated the orifice area of instantaneous tricuspid regurgitation by dividing the instantaneous regurgitant flow rate by the velocity of a regurgitant jet. The tricuspid regurgitant orifice area decreased to 25% of its initial value during systole and increased slightly during isovolumic relaxation.