Vital sign parameters are not associated with electrical capture during transcutaneous pacing
Do not use plethysmograph waveforms, capnometry, or blood pressure monitoring in isolation to confirm electrical capture during TCP. Since these parameters are unreliable predictors, continue to treat the patient based on clinical suspicion and established protocols rather than waiting for definitive confirmation from peripheral monitors alone. Remember that pacing success must be inferred cautiously when relying solely on non-invasive readings.
This article addresses the common reliance on peripheral monitoring parameters to confirm successful electrical capture when performing transcutaneous pacing (TCP) in prehospital settings. The authors report that standard bedside monitors, including plethysmograph waveforms, capnometry readings, and blood pressure measurements, are insufficient predictors of true electrical capture during paramedic-administered TCP. Essentially, the data suggests that these physiological parameters alone do not reliably confirm whether the pacing stimulus is achieving adequate myocardial depolarization. This finding cautions clinicians against over-relying on waveform changes or hemodynamic stability as definitive proof of successful pacing capture.