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Relationship Between Pulmonary Artery Pressure and Catheter Position

patients with regard to more than 2 mm ST depression during submaximal treadmill stress tests, and if so, what percentage of this subgroup had main left coronary artery obstruction on coronary angiography? Admittedly, only 11 patients in their group had main left coronary disease so that the statistical significance of such an observation might be questioned. Nevertheless, if most patients with greater than 2 mm of ST depression on exercise stress testing have main left coronary disease demonstrated by coronary angiography, this subgroup of patients with coronary artery disease could be better suspected prior to coronary angiography. Because of the poor natural history, even asymptomatic patients with a prior myocardial infarction or prior angina should probably have coronary angiography performed and coronary vascular surgery if main left disease is demonstrated. It would also be useful for the coronary angiographer to be forewarned of the likelihood of main left coronary artery disease since Cohen's series demonstrated an approximately 15% mortality of the cardiac catheterization procedure alone.