The corrected SNRT (CSNRT) value is derived by calculating

The corrected SNRT (CSNRT) value is derived by calculating

• A. SNRT + SCL
• B. SNRT - SCL
• C. SNRT x SCL
• D. SNRT / SCL

Answer: (B)

Corrected SNRT is obtained by subtracting the pacing cycle length from the raw SNRT. SNRT measures how long the sinus node takes to resume ordinary rhythm after pacing, but the time you see is influenced by the length of the last paced interval. By removing that paced interval (the SCL), CSNRT reflects only the additional delay due to the sinus node’s intrinsic recovery, allowing apples-to-apples comparisons across different pacing rates. Adding would overcount the pacing time, while multiplying or dividing would not yield a meaningful time representing recovery delay.

Corrected SNRT is obtained by subtracting the pacing cycle length from the raw SNRT. SNRT measures how long the sinus node takes to resume ordinary rhythm after pacing, but the time you see is influenced by the length of the last paced interval. By removing that paced interval (the SCL), CSNRT reflects only the additional delay due to the sinus node’s intrinsic recovery, allowing apples-to-apples comparisons across different pacing rates. Adding would overcount the pacing time, while multiplying or dividing would not yield a meaningful time representing recovery delay.