|First Author (Year) (Ref. #)||Study Type||Population||HF||N||First-Degree AVB (ms)||First-Degree AVB, n (%)||Age|
|Mean F/U (Months)||Outcomes Related to First-Degree AVB||Notes|
|Park et al. (2013) (9)||Registry analysis||Korean Heart Failure registry 2004–2009||Acute HF LVEF 35%∗ 58% NYHA III/IV||1986||>200||310 (16)||70∗||18∗||Adverse in-hospital outcomes when PR >200 ms was combined with QRS ≥120 ms||26% had previous history of HF|
|Schoeller et al. (1993) (50)||Prospective study||IDC 1982–1989||IDC LVEF <55% NYHA II–IV||94||>200||15 (18)||48||49||First-or second degree AVB increased risk of cardiac death and sudden cardiac death|
|Xiao et al. (1996) (49)||Retrospective analysis||Royal Brompton 1991–1995||IDC LVEDd >6.5 cm||58||Not defined||-||58||54||Patients who died or required pacemaker had prolongation of PR during the study period|
Values are mean except as noted.
IDC = idiopathic dilated cardiomyopathy; LVEDd = left ventricular end-diastolic diameter; LVEF = left ventricular ejection fraction; other abbreviations as in Table 1.