In this noteworthy and open access review article Geri et al. discuss current literature and state that there are no randomised studies looking at acute coronary angiography in OHCA patients. A large number of observational studies though supports feasibility and a possible survival benefit of an early invasive approach.
They conclude that even in the absence of large randomised studies, it is probable that an early coronary revascularization is associated with a significant clinical benefit in OHCA survivors.
Providing the patient had no other obvious reason for OHCA (sepsis, haemorrhage, metabolic disorder etc.) current literature strongly encourages performing a systematic coronary angiography in all OHCA patients.