Pakistan’s jailed former prime minister Nawaz Sharif’s condition is “very serious” after heart complications and he should be shifted to hospital without any delay, his doctor said on Wednesday.

He was later discharged from hospital and taken back to jail following medical tests. Doctors of the Punjab Institute of Cardiology Lahore, where his medical tests were conducted, said Sharif’s condition was “not very serious”, but suggested “aggressive medication” and regular medical follow-ups to avoid cardiac complications.

However, Sharif’s cardiologist Adnan Khan termed his condition as “very serious” and said he should be shifted to hospital without any delay. “Nawaz Sharif’s treatment at jail is not possible because of his heart complications. He should be shifted to hospital forthwith so that he is properly taken care of,” Khan said.

“Even a special medical board that earlier examined Mr Sharif had suggested shifting him to hospital for treatment but the government did not heed to the suggestion,” he said.

The report says that the left ventricle, the main pumping chamber of the heart, is damaged on the lower left wall, it said.Expressing concern about Sharif’s health, his daughter Maryam tweeted: “My only source of information on what is happening to my father is the media only.”Sharif’s brother Shahbaz Sharif asked the government to provide best healthcare facilities to the three-time prime minister.