Abstract
We investigated the effect of β- and α-adrenergic blockers on fractional flow reserve (FFR) and index of microvascular resistance (IMR). In 43 patients (pts) with intermediate stenoses, we measured FFR and IMR before and after nonselective β-blocker propranolol (30 μg/kg, n = 20) and selective β1-blocker metoprolol (40 μg/kg, n = 23) IC; (b) In additional 21 pts after percutaneous coronary intervention (PCI), FFR and IMR were measured before and after α-blocker phentolamine (3 mg) IC. Neither propranolol nor metoprolol changed values of FFR and IMR. Phentolamine slightly decreased FFR (from 0.88 ± 0.05 to 0.87 ± 0.06, p = 0.025) but did not change IMR. FFR decreased from >0.80 to ≤0.80 in 3 pts (14 %), but in none, the value decreased to <0.75. β-blockers do not affect FFR and IMR in intermediate stenoses. After PCI, a mild decrease in FFR occurs after α-blockers, though of limited clinical impact.
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Associate Editor Angela Taylor oversaw the review of this article
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Barbato, E., Sarno, G., Berza, C.T. et al. Impact of Alpha- and Beta-Adrenergic Receptor Blockers on Fractional Flow Reserve and Index of Microvascular Resistance. J. of Cardiovasc. Trans. Res. 7, 803–809 (2014). https://doi.org/10.1007/s12265-014-9599-8
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DOI: https://doi.org/10.1007/s12265-014-9599-8