Table 1. Clinical characteristics.
| First author (year) | Study design | Country or region | Definition for RBBB | Types of included RBBB | Study participants | Study period | Sample size | RBBB | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| New-onset | Transient | Permanent | Previous | ||||||||
| Gann et al. (1975) | Retrospective | USA | rsR′, rSR′ or qR complex ≥0.12 s duration in the right precordial leads | RBBB, with either normal axis, left or right axis deviation | Patients with acute myocardial infarction | 1971–1972 | 75 | 35 | 40 | ||
| Melgarejo-Moreno et al. (1997) | Prospective | Spain | RBBB was defined by using standard ECG criteria; a QRS duration of ≥120 ms was required | Compared with complete AVB or not | Patients consecutively diagnosed with acute myocardial infarction | 1992.6–1994.1 | 96 | 51 | 25 | 26 | 45 |
| Vivas et al. (2010) | Cohort | Spain | BBB was present when the QRS duration was ≥120 ms. RBBB was present when the secondary R wave (R′) in V1 and a wide S wave in leads V5 to V6 were detected | Compared with complete AVB or not | Consecutive patients with STEMI undergoing primary PCI | 2004.1–2008.6 | 119 | 92 | 47 | 42 | 27 |
| Melgarejo-Moreno et al. (2015) | Prospective | Spain | Conduction disturbances were defined using standard electrocardiographic criteria | NA | Patients with acute MI | 1998.1–2008.1 | 465 | 212 | 137 | 75 | 253 |
| Iwasaki et al. (2009) | Retrospective | Japan | (1) a QRS duration ≥120 ms, (2) the presence of an rSR′ pattern of QRS in lead V1, (3) a PQ interval >120 ms, and (4) a S wave in lead I and either lead V5 or V6 | NA | Acute anterior or inferior myocardial infarction within 48 h after the onset of symptoms | 1997.1.1–2006.12.31 | 119 | 99 | 58 | 41 | 20 |
Notes:
Summary of clinical characteristics of eligible studies.
RBBB, right bundle-branch block; PCI, percutaneous coronary intervention; STEMI, ST-elevation myocardial infarction; LVEF, left ventricular ejection fraction.