Relationship between canine transthoracic impedance and defibrillation threshold. Evidence for current-based defibrillation.
نویسندگان
چکیده
منابع مشابه
Transthoracic Defibrillation
To improve survival rates in patients undergoing surgical ablative procedures for malignant ventricular tachycardia (VT), a frequent practice is to implant epicardial patch electrodes at the time of map-guided surgery. After operation, patients with inducible VT often receive an automatic internal cardioverter/defibrillator (AICD) implant, whereas patients with noninducible VT usually do not. I...
متن کاملRelation between transcardiac and transthoracic current during defibrillation in humans.
Conceptually, transthoracic defibrillation threshold current can be considered a function of at least two quantities. It is directly proportional to the transcardiac threshold current and inversely proportional to the transcardiac current fraction (FC) or the ratio of transcardiac and transthoracic current. Although experimental and theoretical estimates of FC have been as high as 45%, previous...
متن کاملTransthoracic defibrillation: effect of sternotomy on chest impedance.
The purpose of this study was to determine the effect of sternotomy on transthoracic impedance, a major determinant of current flow and defibrillation success. Transthoracic impedance was determined by using a validated test-pulse technique that does not require actual shocks. Seventeen patients undergoing median sternotomy were studied prospectively. Transthoracic impedance was determined befo...
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The evaluation of the defibrillation threshold (DFT) is common after the implantation of implantable cardioverter defibrillator (ICD) devices. The goal of this standard of care is to achieve successful defibrillation of ventricular fibrillation. In patients with elevated defibrillation thresholds, alternative techniques are required to correct the situation. We describe a case in which an uncom...
متن کاملTransthoracic Resistance in Human Defibrillation
Successful defibrillation depends on delivery of adequate electrical current to the heart; one of the major determinants of current flow is transthoracic resistance (TTR). To study the factors influencing ITR, we prospectively collected data from 44 patients undergoing emergency defibrillation. Shocks of94-450 J delivered energy were administered from specially calibrated Datascope defibrillato...
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ژورنال
عنوان ژورنال: Journal of Clinical Investigation
سال: 1987
ISSN: 0021-9738
DOI: 10.1172/jci113136