Key result
Sustained rapid pacing in dogs transiently spikes ANP despite persistently elevated atrial pressures.
Why the study?
The ability of the atria to maintain elevated plasma concentrations of atrial natriuretic peptide during sustained rapid cardiac pacing was unclear.
Does sustained rapid cardiac pacing alter plasma ANP concentrations over time in dogs?
Population
7 chloralose-anaesthetized dogs
Comparison
Baseline vs sustained rapid cardiac pacing
Design
Preclinical experimental study
Follow-up
4 hours
Authors
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May indicate ANP depletion in sustained canine tachycardia; hypothesis-generating and should not yet inform clinical practice.
Does sustained rapid cardiac pacing alter plasma ANP concentrations over time in dogs?
p-value: p=<0.01
The atria are unable to maintain peak ANP release during sustained rapid pacing despite persistently elevated atrial pressures, suggesting depletion or downregulation of ANP release mechanisms.
Walsh et al. (1988) studied this question. Sustained rapid cardiac pacing vs. Baseline was evaluated on Temporal changes in plasma ANP concentrations (p=<0.01). In dogs, sustained rapid cardiac pacing increased arterial ANP concentrations to a peak at 30 minutes, which then significantly declined by 240 minutes despite persistently elevated atrial pressures.
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