GNRH1 and cardiac arrhythmia: For men aged <75 years and on GnRH antagonists, there was an increased risk of developing AMI (HR = 2.16; 95% CI = 1.27‐3.67; I2 = 0%) and arrhythmia (HR = 1.62; 95% CI = 1.04‐2.51; I2 = 0%).