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  Indian J Med Microbiol
 

Figure 3: Corresponding electrograms showing RR alternans (RR cycle length of 316 and 308 ms), same VA interval, and atrial activation pattern which suggests that there is no beat-to-beat variation of RP interval and P-wave morphology; thus, confirming it as T-wave alternans

Figure 3: Corresponding electrograms showing RR alternans (RR cycle length of 316 and 308 ms), same VA interval, and atrial activation pattern which suggests that there is no beat-to-beat variation of RP interval and P-wave morphology; thus, confirming it as T-wave alternans