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Detection of coronary artery disease in aortic stenosis by exercise gated nuclear angiography
Insights
Exercise gated nuclear angiography helps detect coronary artery disease (CAD) in patients with aortic stenosis (AS). Abnormalities in left ventricular ejection fraction (LVEF) or wall motion suggest CAD, guiding further invasive evaluation.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Diagnostic Imaging
Background:
- Clinical diagnosis of coronary artery disease (CAD) is challenging in patients with aortic stenosis (AS).
- Exercise gated nuclear angiography is a non-invasive imaging technique used to assess cardiac function.
Purpose of the Study:
- To evaluate the diagnostic value of exercise gated nuclear angiography for detecting CAD in patients with AS.
- To determine if exercise-induced changes in left ventricular ejection fraction (LVEF) and wall motion can identify CAD in this population.
Main Methods:
- 33 patients with AS underwent symptom-limited supine cycle ergometer exercise.
- Exercise left ventricular (LV) ejection fraction (EF) and wall motion analysis were performed using gated nuclear ventriculography.
- Patients were categorized based on AS severity and presence of significant CAD.
Main Results:
- 13 patients had significant CAD; 12 showed decreased LVEF and 11 had wall motion abnormalities during exercise.
- In 20 patients without CAD, 10 had abnormal nuclear studies, all with severe AS.
- Abnormal LVEF response or wall motion during exercise was observed in patients with CAD, irrespective of AS severity.
Conclusions:
- Abnormal exercise LVEF response or wall motion analysis in patients with AS is indicative of CAD and warrants further invasive evaluation.
- Normal exercise LVEF and wall motion response in patients with AS suggest the absence of significant CAD, allowing for safe deferral of invasive procedures.
Abstract:
Because the clinical diagnosis of coronary artery disease (CAD) in the presence of aortic stenosis (AS) is difficult, the value of exercise gated nuclear angiography in detecting CAD in 33 patients with AS was assessed. Exercise left ventricular (LV) ejection fraction (EF) and wall motion analysis were evaluated after symptom-limited supine cycle ergometer exercise. Sixteen patients had severe AS (valve area 0.8 cm2 or less). Thirteen had significant associated CAD (50% or greater reduction in luminal diameter of 1 major coronary artery). Twenty patients had normal coronary arteriograms. All 10 patients with mild to moderate AS and normal coronary arteries had normal nuclear studies. Patients with CAD, regardless of the severity of AS, had a decrease in LVEF during exercise (12 of 13 patients) and regional wall motion abnormalities (11 of 13 patients). Abnormal exercise gated nuclear ventriculographic studies occurred in the absence of CAD in 10 of 20 patients, and all had severe AS (mean aortic valve area 0.8 cm2 or less, range 0.4 to 0.8). Ten had an abnormal LVEF response to exercise and 7 had exercise-induced abnormal wall motion. These findings suggest that the presence of an abnormal LVEF, whether in conjunction with an abnormal wall motion analysis, is indicative of further invasive evaluation; conversely, in those patients with a normal response of LVEF and normal wall motion during exertion, invasive studies may be safely deferred.