Alternatives for obese outlined
Several have shown promise, Dr. Joglar said. As one of several examples, he cited a 20-patient study that randomized patients to adhesive patches, like those employed in the Aymond trial, or handheld paddles. Both patches and paddles were applied with manual pressure while a 200-joule shock was delivered. The proportion of patients who cardioverted on the first shock was almost two times higher in the group after the first shock with the paddles (50% vs. 27%; P = .01). Dr. Joglar said the study supports the principle that 200 joules delivered by adhesive patches is inadequate for treatment of AF in many patients with obesity.
Dr. Joglar also cited studies suggesting that single DCCV delivered with higher energy than 200 joules appears to improve cardioversion success rates, but he indicated that this study with dual DCCV in the front-line setting provides evidence for another alternative.
“This is the first such trial with dual defibrillators as an initial strategy,” he said, calling the groups well matched and the superiority of dual DCCV “impressive.” He cautioned that the study size was well powered for the endpoint but perhaps small for evaluating relative safety.
Yet, “the study adds credibility and confidence for the use of dual DCCV, especially in difficult or refractory patients,” he said. He is less certain that it establishes dual DCCV as a standard first-line therapy in all patients with obesity. This would require additional studies to compare it to other types of strategies such as those he mentioned.
As an option for improving cardioversion in first-line treatment, dual DCCV “can be added to a list of other techniques, such as manual pressure or a higher initial dose with single DCCV,” he said.
Dr. Aymond and Dr. Joglar report no potential conflicts of interest.