Key result
Cardiopulmonary bypass acutely decreased myocardial isoproterenol-stimulated adenylyl cyclase activity by 21% (P=0.0062), regardless of preoperative beta-blocker administration.
Why the study?
Does cardiopulmonary bypass reduce myocardial beta-adrenergic receptor signaling in adult patients undergoing aortocoronary surgery?
Population
52 adult patients undergoing aortocoronary surgery requiring cardiopulmonary bypass (CPB)
Comparison
Cardiopulmonary bypass (CPB) vs Pre-CPB state (baseline)
Design
Cohort
Follow-up
Immediately before discontinuation of CPB
Authors
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CPB may impair postoperative myocardial beta-adrenergic responsiveness; hypothesis-generating for inotrope strategies and signaling mechanisms.
Observational (n=52)
Does cardiopulmonary bypass reduce myocardial beta-adrenergic receptor signaling in adult patients undergoing aortocoronary surgery?
Effect estimate: 21% decrease
Absolute Event Rate: 540% vs 750%
p-value: p=0.0062
Cardiopulmonary bypass acutely decreases myocardial adenylyl cyclase response to beta-adrenergic agonists in adults, which is not prevented by preoperative beta-blockers.
Booth et al. (1998) conducted an observational in Aortocoronary surgery requiring cardiopulmonary bypass (n=52). Cardiopulmonary bypass (CPB) vs. Before CPB was evaluated on Isoproterenol-stimulated adenylyl cyclase activity (pmol cAMP/mg protein) (21% decrease, p=0.0062). Cardiopulmonary bypass acutely decreased myocardial isoproterenol-stimulated adenylyl cyclase activity by 21% (P=0.0062), regardless of preoperative beta-blocker administration.
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