"We have him in intensive care, he's stable and medicated to control his hypertension," Cedeno told reporters.
Martinelli is accused of spying on the telephone calls of more than 150 people, including journalists and politicians. He is also under investigation in about 20 other cases of corruption.
On Monday a handcuffed Martinelli, escorted by US Marshals, greeted reporters gathered to see him off at the Miami-area airport.
"I'm ready to watch the World Cup!" he said, giving a thumbs-up. Panama qualified for the tournament, which begins on Thursday.
His return to Panama comes at a time of political turbulence as the country prepares for general elections in May.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)