Dubai's ruler, Sheikh Mohammad bin Rashed al-Maktoum, paid a visit to Pakistan's president at a hospital in the emirate after he suffered a minor heart attack, state media reported on Wednesday.
Pakistan's embattled President Asif Ali Zardari was flown to Dubai for medical treatment on Tuesday after falling ill.
Sheikh Mohammad, also vice president and prime minister of the United Arab Emirates, wished Zardari a "speedy recovery," the official WAM news agency reported, without giving any further details.
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An adviser to the Pakistani prime minister told AFP that Zardari had suffered "a minor heart attack on Tuesday. He flew to Dubai where he had an angioplasty."
He said the president would return to Pakistan on Thursday, adding that despite media reports to the contrary, Zardari was not planning to resign.
The prime minister's office however later released a statement saying that although the president was "stable" he would remain under observation as doctors examine the cause of his illness.
Zardari took office after his Pakistan People's Party won general elections in February 2008, three months after his wife, former prime minister Benazir Bhutto was assassinated.
Although he has survived numerous crises and calls for his resignation, he has come under growing pressure over a memo allegedly written by close aide Husain Haqqani asking for US assistance in curbing the powerful military.