By David L. Hayes, Samuel J. Asirvatham, Paul A. Friedman
Together with thirteen chapters, this publication is uniformly written to supply good, matter-of-fact equipment for figuring out and taking care of sufferers with everlasting pacemakers, ICDs and CRT systems.Now stronger and up-to-date, together with a brand new bankruptcy on programming and optimization of CRT units, this moment variation provides a large number of details in an simply digestible shape. Cardiac Pacing and Defibrillation bargains brilliant, matter-of-fact tools for realizing and taking care of sufferers, making daily scientific encounters more uncomplicated and extra productive.Readers will take pleasure in the data and event shared by way of the authors of this publication.
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Additional info for Cardiac Pacing and Defibrillation: A Clinical Approach
The ventricular endocardial electrogram and pacemaker sensing. J Thorac Cardiovasc Surg 1977; 73:258–66. 28 Kleinert M, Elmqvist H, Strandberg H. Spectral properties of atrial and ventricular endocardial signals. Pacing Clin Electrophysiol 1979; 2:11–9. 29 Watson W. Myopotential sensing in cardiac pacemakers. In: Barold SS, ed. Modern cardiac pacing. , 1985:813–37. 30 Parsonnet V, Myers GH, Kresh YM. Characteristics of intracardiac electrograms II: Atrial endocardial electrograms. Pacing Clin Electrophysiol 1980; 3:406–17.
Note from the curve that the likelihood of success at the DFT energy (10 J) is 70%. Now, if the DFT process were repeated, it is possible that the second shock might fail on one occasion (defining the DFT as 20 J) or that all four shocks might succeed on another occasion (and that a lower energy shock would fail to define the DFT), and so on. Thus, repeating the DFT determinations may result in different values for the DFT with each determination. However, if enough repetitions were performed, a population of DFTs, as shown in (B), would be created.
From Schuder JC, Rahmoeller GA, Stoeckle H. Transthoracic ventricular defibrillation with triangular and trapezoidal waveforms. Circ Res 1996; 19:689–94. ) thoracic defibrillation, an ascending ramp waveform has a much higher success rate with the same delivered current than does a descending ramp (Fig. 30). 116 However, because of the importance of using physically small circuits for implantable devices, a capacitor discharge, which more closely resembles the descending ramp is employed in devices.