Continuous monitoring of mixed venous oxygen saturation during exercise using fiberoptic pulmonary artery catheter Norifumi Nakanishi 1 , Takao Yoshioka 1 , Toshikazu Hashizume 1 , Hiroshi Nonogi 1 , Shumpei Okubo 1 , Akito Shimouchi 2 , Muneyasu Saito 3 1Cardiac Division, Department of Internal Medicine, National Cardiovascular Center 2Research Institute, National Cardiovascular Center 3Omiya Medical Center, Jichi Medical School Keyword: 混合静脈血酸素飽和度(mixed venous oxygen saturation) , 運動負荷試験(exercise testing) , fiberoptic pulmonary artery catheter pp.799-804
Published Date 1990/8/15
DOI https://doi.org/10.11477/mf.1404900197
  • Abstract
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We measured the mixed venous oxygen saturation (SvO2) continuously using a fiberoptic thermodilution pulmonary artery catheter to analyze the time course of SvO2 during exercise, and evaluated the relation-ship between SvO2 and exercise load, SvO2 and car-diac output. Five patients with old myocardial in-farction and one healthy man underwent pulmonary arterial catheterization and then performed an in- cremental steady state exercise test using a supine cycle ergometer. There was a rapid fall in SvO2 43.4±10.6 seconds after the start of exercise and new steady state were achieved 92.6±22.5 seconds after changing the exercise load. The value of SvO2 at exercise load 60 watts were 44.7±9.8% and this value was under the level of lactic acid accumulation. SvO2 correlates well with cardiac output by the thermodilution method in individual patienst. We conclude that a fiberoptic thermodilu-tion pulmonary artery catheter was useful to evaluate the dynamic changes of SvO2 during exercise.

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