The OPD services also remained affected as the doctors stayed away from work.
However, a PGIMER spokesperson said that with the help of senior faculty and paramedics, the patients were examined in all the OPDs while Emergency, OTs, ICUs and indoor patient care "has been going on as usual using the services of faculty and willing resident doctors".
A committee had been constituted to ascertain the facts about the conflict between the resident doctors and the technician.
Yesterday, the report was submitted after which the institute initiated disciplinary action against the OT technician, the spokesperson said.
"Despite the fact that the administration had taken immediate action, the resident doctors have gone on mass casual leave affecting patient care services. The resident doctors have been requested to join work immediately.
The strike is illegal and disciplinary action will be initiated against those who have violated the conduct rules," the spokesperson said, terming action of the resident doctors as "unwarranted and baseless".
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Yesterday, during the general body meeting of doctors, they had decided to go on mass casual leave today.
Ajay Mishra, a senior resident doctor of department of anaesthesia had alleged he was manhandled by a operation theatre technician on duty last week.
However, the Operation Theatre Technical Staff Association denied the allegation and termed it as fabricated.
There are around 1,200 resident doctors at the PGIMER, of whom around 500 are posted in the emergency care.