January 1, 1975Cardiovascular Research
Electrophysiological effects of the antiarrhythmic agent QX-572 in the human heart with special reference to rate-induced changes in effective refractory periods
Key result
QX-572 decreased atrioventricular node conduction time and shortened effective refractory periods, with effects disappearing 30 minutes after infusion.
Why the study?
Does QX-572 alter electrophysiological properties such as conduction time and effective refractory periods in the human heart?
Population
Human subjects (specific demographics and sample size not stated)
Design
Other
Follow-up
30 minutes post-infusion
Authors
Discussion
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Implication
Transient AV nodal effects advise periprocedural vigilance; leaves open sympathetic mechanisms for targeted research.
Structured PICO
Does QX-572 alter electrophysiological properties such as conduction time and effective refractory periods in the human heart?
P
Population
Human subjects (specific demographics and sample size not stated)
I
Intervention
QX-572 (N,N-bis(phenylcarbamoylmethyl)dimethylammonium chloride) 8 mg/kg body weight via infusion
O
Outcome
Electrophysiological effects including conduction time through the atrioventricular node, intra-atrial/intraventricular conduction, and effective refractory periodssurrogate
QX-572 produces transient shortening of AV node conduction time and effective refractory periods in the human heart, likely due to increased sympathetic tone.
Cite This Study
Rydén et al. (1975) studied this question. QX-572 was evaluated on Conduction time and effective refractory periods. QX-572 decreased atrioventricular node conduction time and shortened effective refractory periods, with effects disappearing 30 minutes after infusion.