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Effects of Physical Parameters of Fulguration on Electrophysiological and Anatomical Properties of Canine Myocardium
Author(s) -
LAVERGNE TH.,
HEUZEY J.Y.,
BRUNEVAL P.,
GUIZE L.,
BOUTJDIR M.,
EUW D.,
PERONNEAU P.
Publication year - 1986
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1986.tb06725.x
Subject(s) - fulguration , medicine , ventricle , electrophysiology , electrical shock , shock (circulatory) , cardiology , refractory period , surgery , electrical engineering , engineering
In order lo determine the respective roles of catheter (Ct) physical properties and of energy levels in myocardial effects of fulguration, we delivered an electrical shock between the tip electrode of a Ct placed at the apex of the right ventricle and a large cutaneous cathodal electrode in 12 dogs. Two energy levels were used: Group A = 25 J (n = 6) and group B = 100 J (n = 6), and three Cts were studied. These Cts had different resistances (R) and active surface electrodes (S): Ct 1 (R = 0.3 ω S=12 mm 2 ), Ct 2 (H = 0.3 ω, S = 2 mm 2 , Ct 3 (R = 2 ω S = 13 mm 2 ). Complex ventricular arrhythmias were observed in 5/6 cases at 100J but only in 1/6 case at 25J and were independent of the Ct type. Following the shock, the effective ventricular refractory period (S 1 S 1 = 300 msec) increased significantly only at 100J(11%, p = 0.03). Anatomical lesions were wider (10.6 vs. 5.2 mm, p < 0.05) and deeper (100 vs. 55%, p < 0.05) in the 100 J group. In contrast, there was no significant difference in the electrophysiological and anatomical changes between the three Cts. In conclusion, (1) arrhythmogenic adverse effects of ventricular Ct fulguration are related to the delivered energy; (2) on the contrary, they seem only slightly dependent on Ct physical properties at these energy levels; (3) a 2 J/kg shock is not only effective but also seems to be safe.