Indications for Stress Thallium
- Unable to walk or exercise to targert heart rate (85% of 220-age) - consider pharmacologic stress (persantine)
- Abnormal resting EKG
- bundle branch block (RBBB, LBBB, left anterior hemiblock)
- left ventricular hypertrophy
- significant ST-T wave abnormalities
- significant Q waves
- Wolf-Parkinson-White syndrome or pre-excitation
- Medications
- digoxin (false + regular stress test)
- quinidine (false +)
- procainamide (false +)
- nitrates (false -)
- beta blocker (false -)
- calcium channel blocker, especially diltiazem (false -)
- Valvular heart disease
- especially moderate to severe disease (may not be able to exercise)
- mitral valve prolapse (can have false + regular stress)
- Significant congential heart disease
- Cardiomyopathy
- Hypokalemia
- Anemia
- Hypertensive heart disease
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