Rate Related Bundle Branch Blocks

Case and content by Brandon Fainstad, MD.
Edits and graphics by Yilin Zhang, MD. 


OBJECTIVES:


CASE:

70 yo M presents with sepsis secondary to a presumed skin and soft tissue infection. On presentation, he is febrile and tachycardic to 145 bpm.

ECG
Baseline EKG

How do you explain the change from his baseline ECG? 


TAKE HOME POINTS:


REFERENCES:
  1. Denes, P, et al: Electrophysiological observations in patients with rate dependent bundle branch block. Circulation.1975;51:244-250
  2. Fisher, JD & Aronson, RS. Rate-dependent Bundle Branch Block: Occurrence, Causes, and Clinical Correlation. JACC. 1990;16(1): 240-243.