Why the study?
Does dl-sotalol 80 mg twice daily alter Class II (low frequency spectral power) and Class III (QTc interval) activity in healthy male volunteers?
Does dl-sotalol 80 mg twice daily alter Class II (low frequency spectral power) and Class III (QTc interval) activity in healthy male volunteers?
In healthy volunteers, repeated oral administration of dl-sotalol 80 mg twice daily demonstrated potent Class II (beta-blocking) activity without significant Class III (QTc prolonging) activity.
Answers are grounded in this paper and cite their sources.
May support beta-blockade without QTc prolongation in healthy volunteers; leaves open effects in arrhythmia patients.
Racemic sotalol has demonstrated anti-arrhythmic properties which include Class II (beta blockade) and Class III (potassium channel blockade) activity. The Class II activity is demonstrated primarily in l-sotalol, and Class III activity is almost equipotent in each isomer. Class II and Class III activity of dl-sotalol was investigated following repeated oral administration (80 mg b.i.d.) for 7 days. Class II activity was evaluated according to the low frequency spectral power obtained by fast Fourier analysis of the R-R interval variation. Class III activity was evaluated according to the change in the QTc interval of the surface electrocardiogram. The low frequency spectral power decreased after administration of the first dose on day 1 and this trend continued throughout the duration of the study. The QTc interval did not change with dl-sotalol administration. These findings may suggest that Class II activity is more potent than Class III activity.
No takes yet. Share an insight, caveat, or question.
Kimura et al. (1998) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: