Why the study?
Does vagal stimulation or acetylcholine infusion alter left ventricular contractility in rats?
Population
24 rats (in situ Langendorff preparation)
Comparison
Bilateral vagal stimulation and acetylcholine… vs Pre-stimulation or pre-infusion baseline
Design
Preclinical, Rats were randomly divided into 3 experimental protocols
Follow-up
Acute (up to 5 minutes post-intervention)
Authors
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Rat findings on vagal vs ACh effects should not guide human therapies; leaves open species differences in LV innervation.
Does vagal stimulation or acetylcholine infusion alter left ventricular contractility in rats?
In rats, vagal stimulation does not directly decrease left ventricular contractility due to sparse vagal innervation, but induces an indirect positive inotropic effect via bradycardia, whereas acetylcholine infusion directly decreases contractility at a fixed heart rate.
Takahashi et al. (2003) studied this question.
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