Key result
Intravenous KCN injections in unanesthetized rats produced intense bradycardia and decreased stroke volume, leading to a 76% reduction in cardiac output during chemoreflex activation.
Why the study?
Does autonomic blockade alter the systemic hemodynamic response to chemoreflex activation by KCN in unanesthetized rats?
Does autonomic blockade alter the systemic hemodynamic response to chemoreflex activation by KCN in unanesthetized rats?
Cardiac output is greatly reduced during KCN-evoked chemoreflex in rats, driven by intense parasympathetic bradycardia and decreased stroke volume secondary to increased afterload.
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Rat chemoreflex markedly lowers CO via bradycardia; leaves open autonomic blockade effects and human translation.
Franchini et al. (1997) studied Chemoreflex activation (n=6). Intravenous KCN vs. Control period (before autonomic blockers) was evaluated on Systemic hemodynamics (HR, BP, CO, SV, TPR). Intravenous KCN injections in unanesthetized rats produced intense bradycardia and decreased stroke volume, leading to a 76% reduction in cardiac output during chemoreflex activation.
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