An emergency medical technician was stabbed in the back Tuesday night while treating a patient at a rural home in Arroyo Grande.

Resident Thomas Kadota had called requesting medical aid for his elderly mother at 9:45 p.m., according to a news release from the Sheriff's Office. San Luis Ambulance and Cal Fire responded to the call at 2382 Left Lane in rural Arroyo Grande.

While the responding crew tended to the woman, Kadota, 38, allegedly became agitated and stabbed one of the San Luis Ambulance technicians in the back.

Sheriff's deputies arrived and evacuated the medical personnel and the elderly woman from the home, according to the news release.

Kadota remained inside and was uncooperative, according to authorities. After 5 1/2 hours of negotiation, Kadota came out of the house and was arrested on suspicion of assault with a deadly weapon.