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External Defibrillation (external + defibrillation)
Selected AbstractsTopics of Special Interest in an Emergency Medicine Course for Dental Practice TeamsEUROPEAN JOURNAL OF DENTAL EDUCATION, Issue 2 2004S. Weber Considering increasing life expectancy and population comorbitity, not only dentists but also nursing staff should gain knowledge and skills in treatment of patients in acute life-threatening situations. In cooperation with the State Dental Council, a 1-day course in the management of medical emergencies based on the ERC ALS guidelines was held for primary care dental practice teams. Following a short lecture series (2 hours), a systematic skills-training session (6 hours) was performed in small groups, addressing the following subjects: BLS, airway management and ventilation, intravenous techniques, manual and automated external defibrillation, ALS and resuscitation routine in a typical dental practice setting. For all skills-training sessions, life-like manikins and models were utilized and the emergency scenarios were simulated by the use of a universal patient simulator (SimMan®, MPL/Laerdal). At the end of the course, an evaluation questionnaire was completed by all candidates to find out in which emergency situations the dental practice teams now felt well trained or incompetent. In the first course with 32 participants, 13 were dentists and 19 were dental nurses. In the evaluation results, 53% of both, dentists and nurses, stated to be competent in cardiac arrest situations. 95% of the nurses, but only 69% of the dentists, thought that an automated external defibrillator should be available in the dental practice. 26% of the dentists felt unable to treat patients with anaphylactic reactions adequately, whereas 37% of the nurses felt incompetent in respiratory emergencies. [source] Reentry Site During Fibrillation Induction in Relation to Defibrillation Efficacy for Different Shock WaveformsJOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 5 2001Ph.D., RAYMOND E. IDEKER M.D. Reentry Site and Defibrillation Waveform Efficacy.Introduction: Unsuccessful defibrillation shocks may reinitiate fibrillation by causing postshock reentry. Methods and Results: To better understand why some waveforms are more efficacious for defibrillation, reentry was induced in six dogs with 1-, 2-, 4-, 8-, and 16-msec monophasic and 1/1- (both phases 1 msec) 2/2-, 4/4-, and 8/8-msec biphasic shocks. Reentry was initiated by 141 ± 15 V shocks delivered from a defibrillator with a 150- , F capacitance during the vulnerable period of paced rhythm (183 ± 12 msec after the last pacing stimulus). The shock potential gradient field was orthogonal to the dispersion of refractoriness. Activation was mapped with 121 electrodes covering 4 × 4 cm of the right ventricular epicardium, and potential gradient and degree of recovery of excitability were estimated at the sites of reentry. Defibrillation thresholds (DFTs) were estimated by an up-down protocol for the same nine waveforms in eight dogs internally and in nine other dogs externally. DFT voltages for the different waveforms were positively correlated with the magnitude of shock potential gradient and negatively correlated with the recovery interval at the site at which reentry was induced by the waveform during paced rhythm for both internal (DFT = 1719 + 64.5 , V , 11.1RI; R2= 0.93) and external defibrillation (DFT = 3445 + 150 , V , 22RI; R2= 0.93). Conclusion: The defibrillation waveforms with the lowest DFTs were those that induced reentry at sites of low shock potential gradient, indicating efficacious stimulation of myocardium. Additionally, the site of reentry induced by waveforms with the lowest DFTs was in myocardium that was more highly recovered just before the shock, perhaps because this high degree of recovery seldom occurs during defibrillation due to the rapid activation rate during fibrillation. [source] Ineffectiveness of Precordial Thump for Cardioversion of Malignant Ventricular TachyarrhythmiasPACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 2 2007OFFER AMIR M.D. Background:The Precordial Thump (PT) is commonly used for cardiopulmonary resuscitations both in and out of hospitals. However, the support for its efficiency relies mainly on sporadic cases. In this current prospective large study, we tested the effectiveness and safety of PT in a wide range of malignant ventricular tachyarrhythmias. Methods: The study included 80 patients who underwent electrophysiological study and/or implantation of a cardiodefibrillator device. During these procedures, once a malignant ventricular tachyarrhythmia was induced, PT was used as the first treatment option. If the PT failed, other means were used to discontinue the arrhythmia. Results: Polymorphic ventricular tachycardia occurred in 32 (40%) patients, ventricular fibrillation in 28 (35%) patients, and 20 (25%) patients had sustained monomorphic ventricular tachycardia. Except in one patient with monomorphic ventricular tachycardia, the PT was unsuccessful in terminating any of the other malignant tachyarrhythmias, and internal or external defibrillation was eventually required in all other 79 (99%) patients. The PT was not associated with any damage either to the sternal bone, ribs, or to the cardiodefibrillator device. Conclusions: PT is not effective in terminating malignant ventricular tachyarrhythmia and should be reserved to a situation in which a defibrillator is not available. [source] Unexpected ICD Pulse Generator Failure Due to Electronic Circuit Damage Caused by Electrical OverstressPACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 7 2001ROBERT G. HAUSER Hauser, R., et al.: Unexpected ICD Pulse Generator Failure Due to Electronic Circuit Damage Caused by Electrical Overstress. Because it is a lifesaving device, the unexpected failure of an ICD can be catastrophic. We report ICD electronic circuit failure due to electrical overstress damage (EOS) to the high voltage hybrid circuit and other electronic components in a series of ICD pulse generator models. Data were obtained from the Multicenter Registry of Pacemaker and ICD Pacemaker and Lead Failures, and from the manufacturers' adverse event reports, that were in the FDA's Manufacturer and User Facility Device Experience (MAUDE) database. Of 16 nonbattery Guidant/CPI ICD pulse generator failures reported to the registry, 6 (38%) have been confirmed by the manufacturer to be EOS related, and Guidant/CPI has reported 273 such failures to the FDA as of 12/29/00. The signs of failure included loss of telemetry and inability to deliver therapy, and some patients have experienced serious adverse events. Hybrid circuit damage may have occurred during capacitor charging or reform, and the majority appears to have happened during normal ICD function. While the incidence of this problem is unknown, a management strategy should be adopted that includes routine follow-up every 3 months and device evaluation after a shock or exposure to external defibrillation or electrosurgical devices. This study suggests that additional data are needed to determine the incidence of this problem, and that our present methods for monitoring the performance of ICDs following market release are inadequate. [source] | ||||||||||