PMC6116299_01
Serial electrocardiograms, lead II strips. (a): normal, 5 months prior to admission. (b): Complete third-degree atrioventricular (AV) block, at primary office 12 h before admission. (c): Type I second-degree AV block, 2 h after admission and antibiotic therapy. (d): first-degree AV block, 12 h after admission and antibiotic therapy. (e): normal, at discharge.
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Of note, his cardiac history was unremarkable and his EKG done 5 months earlier for routine check-up was completely normal (Figure 1). Serial EKG's were obtained during his stay (Figure 1).