South Australia Police have launched a commissioner’s inquiry into an arrest in Adelaide’s eastern suburbs that left a man in critical condition.

On May 29, police attempted to arrest Gaurav Kundi on Payneham Rd, Royston Park, at about 2:45am on Thursday, where police allege they witnessed an “altercation” between Kundi and a woman.

While allegedly resisting arrest, the condition of the 42-year-old man from Modbury North declined and he “became unresponsive”.

Know the news with the 7NEWS app: Download today

Kundi was rushed to hospital, where he remains in a critical condition.

SA Police said no one was shot, and no police taser was deployed at the scene.

A woman, who was at the scene, alleges that Kundi was restrained with a knee to his neck by police.

The inquiry will review SA Police’s policies, practices, procedures including training in relation to responding to incidents.

SA Police Commissioner Grant Stevens told ABC Radio Adelaide the inquiry would be conducted “on top of” an investigation by Major Crime and the internal investigation section detectives.