Lebanon's top Shi'ite cleric has successfully undergone a minor procedure to measure the flow of blood to the heart, an aide has said. Mohammed Hussein Fadlallah was released from hospital Tuesday a day after the procedure and is in good condition relaxing at home, said his aide Hani Abdullah. Fadlallah, 73, is one of the most influential Shi'ite clerics in the world, with strong followings in both Lebanon and Iraq. He was once the spiritual leader of Hizbullah. Fadlallah, a harsh critic of US policies in the region, was born in Iraq and lived for 30 years in the Shi'ite holy city of Najaf, Shiism's most prominent seat of learning, before moving to Lebanon. There are 1.2 million Shi'ites in Lebanon, about a third of the country's population.