NPPB and atrioventricular block: From the selected 11 articles, 17 risk factors were identified, including cTnI, TIMI flow grades, persistent hypotension, ECG J-waves, creatine kinase-MB (CK-MB), infarct-related artery (IRA), IRA diameter, reperfusion arrhythmias, BNP, renal insufficiency, newly developed atrioventricular block, ST-segment depression less than 70%, baseline heart rate greater than 70/min, post-PCI TIMI grading, use of blockers within 24 h, left ventricular ejection fraction ≤35%, and a TIMI risk score of 8–14.