PubMed · 7493287
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C Garrote, E Alegría. [Beta blockers].. https://pubmed.ncbi.nlm.nih.gov/7493287/
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Tilt-table testing after therapy with beta blockade is frequently used to predict clinical success. This study found that heart rate and blood pressure reductions after beta-blocker therapy did not predict the results of the follow-up tilt-table test, but low blood pressure at rest before the initial test predicts failure of this therapy.
Dobutamine stress echocardiograms were performed in 6 volunteers under basal conditions and after 72 hours of metoprolol, 50 mg twice daily. Although heart rate responses were blunted, contractility increased to levels seen before beta blockade.