Sources said he suffered a serious cardiac arrest and was immediately moved to National Institute of Cardiovascular Diseases. Special team of doctors also conducted his check-up.
He was currently under detention of Rangers. Personnel of the paramilitary force were also deployed at the hospital for his security and vigilance.
The condition of the PPP leader was not stable at the time of his arrival at the hospital, however, he is now recuperating fast.
Doctors said Dr. Hussain was suffering from heart depression for some time.