In the ATP screen The R-S1 interval is commonly referred to as the _________ interval

In the ATP screen The R-S1 interval is commonly referred to as the _________ interval

• A. Trigger
• B. S1
• C. Coupling
• D. Sequence

Answer: (C)

The main idea is how pacing stimuli are timed relative to the previous beat in anti-tachy pacing. The R-S1 interval is the delay from the last depolarization (the R wave) to the first pacing stimulus in the train (S1). This specific delay is called the coupling interval because it “couples” the pacing stimulus to the preceding beat. Shorter coupling intervals place the stimulus closer to the prior beat, which can influence whether the tachycardia is captured or terminated. The term S1 refers to the first pacing stimulus itself, not the timing; the trigger describes what starts an arrhythmia, and sequence refers to the order of stimuli in the program, not this particular interval.

The main idea is how pacing stimuli are timed relative to the previous beat in anti-tachy pacing. The R-S1 interval is the delay from the last depolarization (the R wave) to the first pacing stimulus in the train (S1). This specific delay is called the coupling interval because it “couples” the pacing stimulus to the preceding beat. Shorter coupling intervals place the stimulus closer to the prior beat, which can influence whether the tachycardia is captured or terminated. The term S1 refers to the first pacing stimulus itself, not the timing; the trigger describes what starts an arrhythmia, and sequence refers to the order of stimuli in the program, not this particular interval.