Intracardiac electrophysiological effects of lorcainide in man
- 1 January 1979
- journal article
- research article
- Published by Springer Nature in European Journal of Clinical Pharmacology
- Vol. 15 (4) , 241-247
- https://doi.org/10.1007/bf00618512
Abstract
The electrophysiological effects of lorcainide 1.25 or 2.5 mg/kg given iv over 2 or 4 min, were studied in 21 patients with normal and diseased impulse formation and conduction, by means of intracardiac recording and stimulation. Sinus rate and the effective atrial refractory period rose following both doses of lorcainide. The corrected sinus node recovery time rose only after lorcainide 2.5 mg/kg and then most markedly in patients with sinus node dysfunction. The P-A interval remained unchanged following the drug. The A-H interval during sinus rhythm, and the pooled A-H intervals during atrial pacing, increased slightly, and the functional and effective A-V nodal refractory period changed variably. Wenckebach periods above the bundle of His occurred at lower atrial pacing rates following both doses of lorcainide in 7 patients, at the same atrial pacing rate in 9 and at higher rates in 3. H-V intervals, pooled H-V intervals and QRS-width lengthened in all patients, most markedly in cases with a conduction delay below the His bundle, who had received lorcainide 2.5 mg/kg. Thus, lorcainide shares some electrophysiological properties with procainamide and aprindine. Higher doses should be used with caution in patients with pre-existing conduction delay below the bundle His.Keywords
This publication has 13 references indexed in Scilit:
- Electrophysiological effects of mexiletine in man.Heart, 1976
- Electrophysiologic effects of procainamide in subtherapeutic to therapeutic doses on human atrioventricular conduction systemThe American Journal of Cardiology, 1976
- Electrophysiologic properties of procainamide in manThe American Journal of Cardiology, 1974
- Atrioventricular block with lidocaine therapyThe American Journal of Cardiology, 1973
- Effects of lidocaine on refractory periods in manAmerican Heart Journal, 1972
- Significance of the Sinus-Node Recovery TimeCirculation, 1972
- Evaluation of Sino-atrial Node Function in Man by Overdrive SuppressionCirculation, 1971
- Patterns of Atrioventricular Conduction in the Human HeartCirculation Research, 1970
- Pervenous Pacing of the Specialized Conducting System in ManCirculation, 1970
- Catheter Technique for Recording His Bundle Activity in ManCirculation, 1969