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Effect of duration of ventricular fibrillation on defibrillation efficacy in humans

R A Winkle, R H Mead, M A Ruder, N A Smith, W S Buch, V A Gaudiani
1990 Circulation  
Little is known about the effects of the duration of ventricular fibrillation on the efficacy of defibrillating shocks.  ...  The currently available automatic implantable cardioverter-defibrillator has proven highly successful for termination of ventricular tachycardia and fibrillation.  ...  Our data probably represent the worst case, because we initiated ventricular fibrillation with rectified alternating current and because all patients were in ventricular fibrillation for the entire duration  ... 
doi:10.1161/01.cir.81.5.1477 pmid:2331763 fatcat:vhdkt4jxkvad7eor5ryvj5ssue

Effect of shock timing on efficasy and safety of internal cardioversion for ventricular tachycardia

Huagui G. Li, Raymond Yee, Rahul Mehra, Paul DeGroot, George J. Klein, Marco Zardini, Ranjan K. Thakur, Carlos A. Morillo
1994 Journal of the American College of Cardiology  
We examined the effect of shock doling within the QRS complex on cardioversion efficacy in n randomized crossover test of shocks delivered at two timing intends relative to QRS onset .  ...  Cardioversion threshold was significantly lower with QRS + 100 shocks than QRS + 0 shocks (3 .1 ± 3 .5 vs. 10 (4) .  ...  Similarly, the peak voltage and current thresholds were significantly lower for QRS + 100 shocks than QRS + 0 shocks (Table 1 ) .  ... 
doi:10.1016/0735-1097(94)90018-3 pmid:8077542 fatcat:mnlfptbtibe5fhtulhjegpcnau

Modified alternating current defibrillation: a new defibrillation technique

S. Rosenheck, S. Gorni, I. Katz, A. Rabin, U. Shpoliansky, M. Mandelbaum, A. T. Weiss
2008 Europace  
Immediate availability of a home-based defibrillator using mains-derived alternating current (AC) current will drastically improve the outcome.  ...  Ventricular fibrillation was induced with rapid ventricular burst pacing, and stable VF was defibrillated after 15 s.  ...  Table 1 1 Defibrillation Threshold with MAC and DC defibrillation MAC DFT, modified alternating current defibrillation threshold; DC DFT, direct current defibrillation threshold. *P ¼ NS (MAC DFT vs.  ... 
doi:10.1093/europace/eun373 pmid:19168498 fatcat:tdto7ye73ffefjz2efigvxbs2e

Empirical Model of a Human Body Resistance at a Hand-To-Hand DC Flow

Sergiusz Boron, Adam Heyduk, Jarosław Joostberens, Joachim Pielot
2016 Elektronika ir Elektrotechnika  
Low mortality in DC shocks also stems from better let-go conditions and higher (during longer shock duration) threshold value of fibrillation current than in the case of 50 Hz or 60 Hz alternating current  ...  Fig. 8 . 8 Approximate relationship between maximum shock duration and expected touch voltages for direct shock current passing along the hand to hand path and liable to cause ventricular fibrillation  ... 
doi:10.5755/j01.eie.22.4.15910 fatcat:mf2rlwfb7zferkd6647wvgjbrm

Comparison of the defibrillation threshold and the upper limit of ventricular vulnerability

P S Chen, N Shibata, E G Dixon, R O Martin, R E Ideker
1986 Circulation  
To examine the relationship between the defibrillation threshold and the strength of shocks that induce ventricular fibrillation during the vulnerable period, we determined the defibrillation threshold  ...  slightly lower than the defibrillation threshold fail because they reinitiate ventricular fibrillation by stimulating portions of the myocardium during their vulnerable period.  ...  The voltage and current of the shock were recorded on an oscilloscope, and the delivered energy was calculated as their product multiplied by shock duration (0.005 sec).  ... 
doi:10.1161/01.cir.73.5.1022 pmid:3698224 fatcat:bh3cfmyajbchdj6x2en2exzdwi

Effect of pentobarbital anesthesia on ventricular defibrillation threshold in dogs

Charles F. Babbs
1978 American Heart Journal  
The effect of pentobarbital anesthesia upon the minimal voltage and current required for electrical ventricular defibrillation (the defibrillation threshold) was investigated in dogs.  ...  Defibrillation threshold current, determined at hourly intervals, did not drift outside ± 10 per cent limits.  ...  Ventricular fibrillation was produced by the application of a 1 second train of 60 Hz, 2 msec. duration rectangular electrical pulses of 5 to 15 volts intensity via the right ventricular catheter.  ... 
doi:10.1016/0002-8703(78)90364-2 pmid:622975 fatcat:nviknba2cnh2hep6wjtfxt25xe

Increasing fibrillation duration enhances relative asymmetrical biphasic versus monophasic defibrillator waveform efficacy

J L Jones, J F Swartz, R E Jones, R Fletcher
1990 Circulation Research  
Results showed that biphasic waveforms had significantly lower voltage and energy thresholds at all fibrillation durations and that their relative efflicacy improved with increasing fibrillation duration  ...  (Circulation Research 1990;67:376-384) P atients with recurrent episodes of ventricular fibrillation are often treated by implantation of an automatic defibrillator system, a procedure that currently requires  ...  Fibrillation and Defibrillation Episodes of ventricular fibrillation were initiated with bipolar delivery of 60 Hz alternating current (2-10 V) delivered to the right ventricular apex via the indwelling  ... 
doi:10.1161/01.res.67.2.376 pmid:2376078 fatcat:qor3qz3j3rduvcdooh4rormlk4

592 Induction of atrial fibrillation during ventricular Defibrillation Threshold Testing shock on t vs. direct current

2005 Europace  
Results: The proposed algorithm by Jaeggi et al. accurately classified the SVT in 81.4% of cases (76% for AVNRT vs. 88% for AVRT).  ...  Methods: In 97 patients (age _> 15 year), 50 with typical AVNRT and 47 with AVRT via a concealed AP, the 12qead ECG of sinus rhythm and tachycardia (QRS duration < 120 ms) were recorded.  ...  Induction of atrial fibrillation during ventricular Defibrillation Threshold Testing shock on t vs. direct current M. Cohen 1, K. Khalighi 2, B. Henderson 3, T. Lescher 3 , S. Brownstein 4, J.  ... 
doi:10.1016/eupace/7.supplement_1.132-b fatcat:g7xifiyxnbe4tiiqjfzf3pqhri

Evaluation of body weight as a predictive factor for transvenous ventricular defibrillation characteristics

J Paisey
2004 Europace  
Aims To investigate the correlation between body weight and defibrillation threshold (DFT) for transvenous lead systems using a porcine model.  ...  Ventricular fibrillation was induced using 60 Hz alternating current of 10 V for 1 s delivered through the defibrillation electrodes.  ...  Each test shock was delivered after 10 s of ventricular fibrillation.  ... 
doi:10.1016/j.eupc.2003.09.005 pmid:14697722 fatcat:2egkgth7zzdcdojgotbfitdohm

An Experimental Study of Transvenous Defibrillation Using a Coronary Sinus Catheter

1989 Journal of Electrophysiology  
(J Electrophysiol 3:253-260, 1989) defibrillation, AlCD, catheter defibrillation, coronary sinus, ventricular fibrillation  ...  Leading edge voltage was similar for all three configurations, but shock duration was longer for configuration A (11.3 ± 2.8 msec) than configuration B (6.6 ± 1.8 msec) or C(6.1 ± 1.5; P < 0.05).  ...  Ventricular fibrillation was induced through the right ventricular catheter using alternating current.  ... 
doi:10.1111/j.1540-8167.1989.tb01561.x fatcat:qysluvkvdjaejp33yxpx3s7iwi

The influence of ventricular fibrillation duration on defibrillation efficacy using biphasic waveforms in humans

Stephan Windecker, Raymond E Ideker, Vance J Plumb, G.Neal Kay, Gregory P Walcott, Andrew E Epstein
1999 Journal of the American College of Cardiology  
The purpose of this study was to prospectively investigate the influence of ventricular fibrillation (VF) durations of 5, 10 and 20 s on the defibrillation threshold (DFT) during implantable cardioverter-defibrillator  ...  Thirty patients undergoing primary ICD implantation or pulse generator replacement were randomly assigned to have the DFT determined using biphasic shocks at two durations of VF each (5 and 10 s,  ...  There are various methods to induce VF, including alternating current, T wave shocks and burst pacing, and their impact on the DFT is not known.  ... 
doi:10.1016/s0735-1097(98)00529-4 pmid:9935005 fatcat:7d7onsxjlfexfnxcgvqx6sw3gy

Effect of shock polarity on ventricular defibrillation threshold using a transvenous lead system

S.Adam Strickberger, John D. Hummel, Laura E. Horwood, John Jentzer, Emile Daoud, Mark Niebauer, Omar Bakr, K.Ching Man, Brian D. Williamson, William Kou, Fred Morady
1994 Journal of the American College of Cardiology  
With the use of epicardial leads for defibrillation, multiple factors, including the shock waveform (1,2), electrode polarity (3) , sequential versus single shocking pulses (4,5) and phasic duration (6  ...  ) have been demonstrated to influence the defibrillation threshold.  ...  1 to 3 s of alternating current.  ... 
doi:10.1016/0735-1097(94)90871-0 pmid:7930199 fatcat:wlptimqnpbdadfqa3kcgzynyti

The right atrial/transoesophagael approach for conversion of atrial fibrillation: a hybrid method for compromise?

D Pfeiffer
2000 European Heart Journal  
Titration of direct current cardioversion power may result in several shocks in cases with a high defibrillation threshold.  ...  A further decrease, to one third of the internal defibrillation threshold, using two sequential shocks delivered over two current pathways in an experimental model has been reported [9] .  ... 
doi:10.1053/euhj.1999.2068 pmid:10781344 fatcat:f72eomw7vbfzxgtxk7qi3wmyzq

Role of endogenous adenosine in postdefibrillation bradyarrhythmia and hemodynamic depression

R C Wesley, L Belardinelli
1989 Circulation  
In protocol 1, repetitive episodes of ventricular fibrillation lasting 15 seconds before transthoracic DC shock were performed in five animals, before (control) and after the administration of BW-A1433U  ...  In ventricular fibrillation episodes requiring rescue shocks, nine of 19 episodes (47%) exhibited secondor third-degree atrioventricular block at 15 seconds postdefibrillation compared with only one of  ...  ventricular fibrillation duration.  ... 
doi:10.1161/01.cir.80.1.128 pmid:2736745 fatcat:fs77xrzjmffjnkpoxbalbqcuuy

Electromagnetic Interference from Swimming Pool Generator Current Causing Inappropriate ICD Discharges

Edward Samuel Roberto, Thein Tun Aung, Atif Hassan, Abdul Wase
2017 Case Reports in Cardiology  
Intracardiac electrograms revealed unique, high-frequency signals at exactly 120 msec suggestive of EMI from a strong external source of alternating current.  ...  This is a unique case of extracardiac EMI by alternating current leakage from a submerged motor used to recycle chlorinated water, resulting in false rhythm detection and inappropriate ICD discharge.  ...  ; VP: ventricular paced; VS: ventricular sensed.  ... 
doi:10.1155/2017/6714307 pmid:28912976 pmcid:PMC5587929 fatcat:zjr54ey6zzepdnzbfe7brrm5bq
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