Key Points
- This study aims to evaluate how stenotic coronary arteries behave during exercise and the impact of nitroglycerin on this response.
- 18 patients with classic angina pectoris performed dynamic exercise during cardiac catheterization.
- Hemodynamic measurements and coronary angiograms assessed changes in luminal areas before, during, and after exercise.
- Patients received either sublingual nitroglycerin after exercise or intracoronary nitroglycerin before exercise.
- During exercise, luminal area of the stenotic artery decreased to 71% of resting levels (p < .001), while the normal artery increased to 123% (p < .001).
- Post-exercise nitroglycerin administration dilated the stenosis to 112% of resting (p < .001), improving symptoms in treated patients.
- Group 2, pretreated with intracoronary nitroglycerin, experienced less myocardial ischemia and maintained better exercise capacity than group 1.
Structured PICO
Does intracoronary nitroglycerin prevent vasoconstriction of stenotic coronary arteries during dynamic exercise in patients with classic angina pectoris?
PPopulation18 patients with classic angina pectoris undergoing cardiac catheterization
IIntervention0.1 mg intracoronary nitroglycerin given before symptom-limited supine bicycle exercise, followed by sublingual nitroglycerin at the end of exercise
CComparatorSymptom-limited supine bicycle exercise without intracoronary nitroglycerin pretreatment, followed by 1.6 mg sublingual nitroglycerin at the end of exercise
OOutcomeLuminal area of normal and stenotic coronary arteries measured by computer-assisted determination from biplane coronary angiograms before, during, and after exercisesurrogate
Exercise-induced narrowing of coronary stenoses is driven by active vasoconstriction, which can be prevented by intracoronary nitroglycerin, thereby reducing myocardial ischemia and preserving work capacity.