Michael Lohan

Michael Lohan is undergoing heart surgery Friday after being hospitalized with chest pains and high blood pressure, Reuters reports.

Lohan, who was rushed to Florida's Gulf Coast Hospital Thursday night, is having a stent inserted and a blood clot removed from his lungs, his rep, Gina Rodriguez, said. He is expected to recover in a week.

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According to Rodriguez, Lohan, 51, had not received his blood pressure or heart medicine in a week at the court-ordered treatment center where he's staying.

Lohan, whose heart problems were documented on Celebrity Rehab last season, was arrested last month on suspicion of domestic violence on his ex-girlfriend Kate Major. He was sentenced to two years probation and ordered to spend the first four months at a treatment center in Fort Myers, Fla.

Lohan had surgery in February to clear a blockage in an artery in his heart.