Usefulness and Problem of the Noninvasive Cardiac Output Monitor : Comparison between Doppler and KSG

Abstract

Measurement of cardiac output by ther 皿 odilution is an invasive technique ． That method provides intermittent data． Recently developing transesophageal doppler ultrasound technique offers a continuous and relatively noninvasive cardiac output monitoring ． Meanwhile Korrotkoff sound graph ( KSG )provides blood pressure ， pulse rate ， strok volume ， cadiac output and total peripheral resistance by caliculating sumilate arterial wave graph which is produced by the intensity of Korrotkoff sound ． We compared simultaneously doppler cardiac eutput ( DCO ) and KSG in 15 patients u 皿 dergoing hysterectomy The Swan Type of KSG had a middle − grade correlation ( r ＝ 0 ， 67 y ＝ 0 ． 7x 十 1 ， 8 ) ． Since KSG had 5 patterns ， other type of KSG was correlated poorly with interventon and hypotension ． KSG is used easi 互 y ． That is ' t so expensive ， but has less reliabilty ． On the other hand DOC was determined easily and reproduciblely if there wer no displacement of esophageal probe or noise from electorical scalpel ． We recomfirmed the usefulness of DOC monitor during the operation ．