8 year-old boy with tachycardia, DCM, and cardiogenic shock.

Adenosine response is as shown; consistent with AT/AFL.

RA map shows the earliest signal at interatrial septal area. Is it early enough?
Noted that CS activation pattern is more of septal rather than left-to-right or right-to-left.

LA map shows the earliest signal at RUPV. The signal is >50ms earlier than the signal in proximal CS. Ablating here terminates the tachycardia.
In this case, the patient is hemodynamically unstable. Focus mapping, rather than detailed mapping, was performed.