Key result
Stimulation of parasympathetic nerve fibers to the AV nodal area in dogs induced a selective negative dromotropic response, while SA nodal stimulation increased the atrial interval.
Why the study?
Does regional parasympathetic stimulation to the AV or SA nodal areas selectively alter AV conduction time and heart period in anesthetized dogs?
Does regional parasympathetic stimulation to the AV or SA nodal areas selectively alter AV conduction time and heart period in anesthetized dogs?
Regional parasympathetic stimulation in the dog heart demonstrates selective control over AV conduction and sinus rate depending on the specific nodal area targeted.
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Selective AV nodal parasympathetic stimulation prolongs AV conduction without affecting sinus rate; leaves open targeted neuromodulation for human arrhythmias.
Furukawa et al. (1990) studied this question. Regional intracardiac parasympathetic nerve fiber stimulation to the AV nodal area (AVP) or SA nodal area (SAP) was evaluated on Cardiac electrical responses (AV interval and atrial interval). Stimulation of parasympathetic nerve fibers to the AV nodal area in dogs induced a selective negative dromotropic response, while SA nodal stimulation increased the atrial interval.
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