The minimum voltage required to consistently capture the myocardium at a specific pulse width (typically 0.4 or 0.5 ms) must be assessed. Acceptable acute thresholds are generally <1.0 V at 0.5 ms, with an implant target of approximately 0.5-1.0 V; chronic thresholds commonly rise somewhat over the following weeks to months before stabilizing, so devices are typically programmed with a safety margin (e.g., 2-3x the measured threshold) above the measured value.
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