1. Conduction disturbances after superior septal approach for mitral valve repair 
Yoshio Misawa, MD, PhD, Katsuo Fuse, MD, Koji Kawahito, MD, Tsutomu Saito, MD, Hiroaki Konishi, MD 
The Annals of Thoracic Surgery 
Volume 68, Issue 4, Pages (October 1999)
DOI: /S (99)

2. Fig 1
PR intervals of patients who had the superior septal approach (SSA) became longer postoperatively and decreased gradually. However, those of patients who had a conventional approach did not change significantly (p values of any PR intervals ≥ 0.10). Between the two groups, there was a significant difference in serial PR interval changes (p = 0.05 by the generalized Wilcoxon test).
The Annals of Thoracic Surgery  , DOI: ( /S (99) )