Sources at the hospital said Samrat is now undergoing treatment at the Coronary Care Unit (CCU) of the hospital.
A three-member medical board, headed by director the hospital Afzalur Rahman, was formed for his treatment.
The authorities of Keraniganj jail took Samrat to Dhaka Medical College Hospital around 7 am after he complained of chest pain.
Later, he was shifted to the National Institute of Cardiovascular Diseases.
Rab members arrested Samrat and Arman, also vice-president of Jubo League Dhaka South unit, from Chauddagram upazila in Cumilla on October 6.
A mobile court, led by Rab Executive Magistrate SarwarAlam, sentenced Samrat to six months’ simple imprisonment under the Wildlife Conservation Act after the elite force recovered two hides of kangaroo from his Kakrail office.
He was then sent to Dhaka Central Jail in Keraniganj on that day.