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Left ventricular hemodynamics at rest and during supine exercise were studied before and 1 year after internal mammary artery implantation in 24 patients with severe coronary artery disease and angina pectoris and in five similar patients before and after 1 year of medical treatment. In the surgical group, 14 had evidence of one or more implants providing collaterals to coronary arteries, and 10 had no evidence of collaterals from the implant. Only two patients, both with functioning implants, showed a return to normal of left ventricular end-diastolic pressure at rest and during exercise. There was no correlation between clinical improvement and hemodynamics at the time of the postoperative study. It is concluded that left ventricular hemodynamics may return to normal after internal mammary artery implantation but this was uncommon in the present study.

circulation

Left Ventricular Hemodynamics Before and 1 Year After Internal Mammary Artery Implantation in Patients with Coronary Artery Disease and Angina Pectoris