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. 1983 Nov;72(5):1563–1574. doi: 10.1172/JCI111115

Effects of energy delivery via a His bundle catheter during closed chest ablation of the atrioventricular conduction system.

J L Trantham, J J Gallagher, L D German, A Broughton, T Guarnieri, J Kasell
PMCID: PMC370444  PMID: 6605367

Abstract

In this paper we summarize our experience and report the characteristics of energy delivery in 23 patients who have undergone closed chest ablation of the normal atrioventricular (AV) conduction system for the treatment of refractory supraventricular arrhythmias. The induction of AV block was achieved by the synchronous delivery of electrical energy with a damped sinusoidal waveform utilizing a standard direct current defibrillator and a standard tripolar His bundle catheter. The procedure was well tolerated, though one patient experienced ventricular fibrillation, which was uneventfully converted with external paddles. Complete AV block was achieved in 20 of 23 patients and all were rendered arrhythmia free, though two still required antiarrhythmic drugs. A stable escape rhythm was seen in all patients with a cycle length of 1,294 +/- 243 ms. Creatine phosphokinase-MB was positive at low levels in 19 of 23 patients and cleared within 24 h. 99mTc pyrophosphate scans were faintly positive in only 2 of 22 patients. Left ventricular wall motion and ejection fractions were unchanged in 19 of 19 patients, two-dimensional echocardiography with microcavitation technique was unchanged in 12 of 12 patients, and a slight increase in pulmonary artery wedge pressure was seen in only 1 of 11 patients. Current, voltage, and their product (power) waveforms were recorded in 12 patients (12 recordings at a defibrillator setting of 200 J and 5 recordings at a defibrillator setting of 300 J) and revealed a complex voltage-current relationship due to changes occurring at the catheter electrode-tissue interface. At 200 J the peak values were 42.2 +/- 3.3 A, 2.16 +/- 0.11 kV, and 87.9 +/- 4.7 kW, while at 300 J the peak values were 58.2 +/- 2.8 A, 2.40 +/- 0.10 kV, and 134.4 +/- 6.7 kW, respectively. No instance of catheter disruption was seen, though "pitting" of the distal electrode (through which current passed) occurred in all but one catheter.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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