Key result
Cholinergic blockade with atropine eliminated respiratory heart rate variations, showing that vagally mediated heart rate variations normally reduce fluctuations in cardiac output and arterial pressure.
Why the study?
Does cholinergic blockade by atropine alter respiration-synchronous fluctuations in stroke volume, heart rate, and arterial pressure in healthy young adults?
Does cholinergic blockade by atropine alter respiration-synchronous fluctuations in stroke volume, heart rate, and arterial pressure in healthy young adults?
Vagally mediated heart rate variations normally counteract mechanically induced stroke volume fluctuations during respiration to stabilize cardiac output and arterial pressure.
No takes yet. Share an insight, caveat, or question.
Hypothesis-generating for vagal stabilization of hemodynamics during respiration; prospective studies needed before clinical relevance.
Toska et al. (1993) studied Healthy (n=10). Atropine vs. Baseline (before atropine) was evaluated on Respiration-synchronous fluctuations in SV, HR, CO and MAP. Cholinergic blockade with atropine eliminated respiratory heart rate variations, showing that vagally mediated heart rate variations normally reduce fluctuations in cardiac output and arterial pressure.
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