Cohen T J, Lowenkron D D
Department of Medicine, Winthrop-University Hospital, Mineola, New York 11501, USA.
Pacing Clin Electrophysiol. 1998 Feb;21(2):468-70. doi: 10.1111/j.1540-8159.1998.tb00075.x.
Pneumothorax has previously been reported to increase defibrillation thresholds and lead impedance in monophasic systems. This article demonstrates a case using an active can system in which the lead impedance between the right ventricular defibrillation coil and the device improved from 70 omega with pneumothorax to 48 omega after resolution. The defibrillation threshold also improved from > 30 J to < or = 10 J after the pneumothorax had resolved. We conclude that acute pneumothorax can increase the transthoracic lead impedance and defibrillation thresholds; however, with resolution both parameters can return to acceptable levels with an active can system.
既往有报道称气胸会增加单相系统中的除颤阈值和导联阻抗。本文展示了一个使用主动式罐体系统的病例，其中右心室除颤线圈与设备之间的导联阻抗在气胸时为70欧姆，气胸消散后降至48欧姆。气胸消散后，除颤阈值也从>30焦耳改善至≤10焦耳。我们得出结论，急性气胸可增加经胸导联阻抗和除颤阈值；然而，在气胸消散后，使用主动式罐体系统时这两个参数均可恢复到可接受水平。
