Mehdi Karroubi, 79, the figurehead of the Green Movement in Iran has once again taken to an emergency room at a hospital in Tehran for heart problems, his son Mohammad Hossein told Jamaran website on Sunday, July 30.

“My father was taken to the hospital for suffering from a very low heartbeat,” said Karroubi junior, adding, “He is scheduled to go under angiography on Monday to pinpoint the cause of his low heartbeat. Then, the cardiologists will decide to either use a stent or a battery to address the problem.”

Karroubi is taken back to hospital a day after his family protested against President Hassan Rouhani’s Intelligence Ministry for its negligence on the elderly politician’s health condition.

Mahdi Karroubi, along with Mir Hossein Mousavi were presidential candidates who challenged Mahmoud Ahmadinejad in his bid for a second term in 2009 presidential election.

Ahmadinejad was officially declared the winner but Mousavi and Karroubi protested and labelled the outcome as “engineered, null and void”.

Their protest led to months of an unprecedented bloody uprising in the short history of the Islamic Republic. Dozens were killed and hundreds more were imprisoned.

Later, in February 2011, Mehdi Karroubi, Mousavi and his wife, Zahra Rahnavard were confined to their houses after they called for street demonstrations in solidarity with “Arab Spring” or pro-democracy movements in Egypt and Tunisia.

Although it is not yet clear who has exactly ordered the house arrests but many believe that the Supreme Leader, ayatollah Ali Khamenei is personally responsible for the decision.