GNRH1 and cardiac arrhythmia: However, men with PCa on GnRH antagonists had an increased risk of developing AMI (HR = 1.62; 95% CI = 1.11‐2.35; I2 = 0%) and arrhythmia (HR = 1.55; 95% CI = 1.11‐2.15; I2 = 17%) compared to men on GnRH agonists.