Coronary stenosis vasomotion during dynamic exercise before and after PTCA

T. M. Suter, O. M. Hess, A. Bortone, H. Nonogi, J. Grimm, H. P. Krayenbuehl
1989 European Heart Journal  
KEY WORDS: Coronary artery disease, coronary vasomotion, percutaneous transluminal coronary angioplasty, supine bicycle exercise. Coronary vasomotion was evaluated in eight patients (age 50 + 8 years) with coronary disease before and 3-3 ± 1 -9 months after successful percutaneous transluminal coronary angioplasty (PTCA). Luminal area of a normal and a stenotic coronary artery was determined before and after PTCA using biplane quantitative coronary arteriography. Patients were studied at rest,
more » ... e studied at rest, during supine bicycle exercise and 5 min after 1-6 mg sublingual nitroglycerin. Workloads before and after PTCA were identical. Percentage diameter stenosis decreased from 78% to 24% (P < 0-001) after PTCA. Mean pulmonary artery pressure increased during exercise from 21 to 40 mmHg (? < 0-001) before and from 19 to 34 mmHg (P < 0-001) after PTCA. Peak exercise pulmonary artery mean pressure was significantly (P < 0-05) lower after PTCA. Normal coronary arteries showed a minimal increase in mean luminal area before (+2%; NS) as well as after (+ 6%; NS) PTCA. Nitroglycerin produced dilation of the normal vessel segment to a similar extent pre-(+27%; P < 0-001) and post-(+31%; P < 0-001) PTCA. In contrast, stenotic vessel segments showed coronary vasoconstriction during exercise before PTCA (-28%; P < 0-01); after PTCA, exercise-induced vasoconstriction of the diseased segment was minimal NS). Nitroglycerin was associated with vasodilation of the stenotic vessel segment before (+17%; NS) as well as after (+26%; P < 0-005) PTCA. Thus, exercise-induced coronary vasoconstriction of stenotic coronary arteries is observed before as well as after PTCA, but vasoconstriction after PTCA is significantly less than before PTCA. Coronary vasomotion appears to be modified in a positive way by PTCA, but the exact mechanism remains unclear.
doi:10.1093/eurheartj/10.suppl_g.58 pmid:2627951 fatcat:ozmvpzljw5bxvamyvooypuvnva