Drs. Barold and Gaidula, as well as Drs. Lown and Kosowsky (correspondence, N Engl J Med 284: 220, 1971), should be complimented by emphasis on the fact that the various pacemaker manufacturers have not always supplied accurate information regarding certain aspects. For instance, artificial refractory periods and synchronization intervals have shown variations, from the data supplied in the manuals, as large as 130 and 240 msec respectively. 1 Moreover, Barold and his co-workers have also shown that QRS complexes of “marginal” amplitude can produce “partial recycling” leading to shorter than normal escape intervals. 2 Finally, it has recently been.
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