指尖容積脈波を用いた妊婦血管刺激反応性に関する検討

Abstract

To determine the change in the blood vessel responsiveness during pregnancy, the vasoconstriction response to an electrical stimulus applied to the tips finger was examined by finger tip photoelectro-plethysmography. The change in the pulse wave amplitude and the elasticity rate of the arterioles were examined in 7 normal non-pregnant females, 42 gravida at various stages of pregnaney and 3 gravida with toxemia. The mean wave height of the volume pulse wave was lowered by the electrical stimulation. Also, the responsiveness of the blood vessels decreased with the advance in the stage of pregnancy. The elasticity of the arterioles increased after the electrical stimulation. Comparing the gravida of the third trimester of a normal pregnancy with the response to the same electrical stimulus, the gravida with toxemia had a markedly decreased pulse wave height, lower elasticity rate of the arterioles and slightly increased blood vessel tension. This method is considered to be useful for evaluating the normal circulatory regulation during pregnancy in the management of the gravida.