Venezuelan President Hugo Chavez's condition "continues to be delicate" due to new "complications" following cancer surgery earlier this month in Havana, Vice President Nicolas Maduro said from the Cuban capital.

Maduro has been visiting Chavez since Friday and provided the update on the president's condition Sunday on national radio and television.

The 58-year-old Chavez, who underwent surgery on Dec. 11, is recovering from his fourth cancer operation in 18 months.

Chavez is experiencing "new complications that emerged as a result of the respiratory infection" diagnosed on Dec. 17, the vice president said.

Maduro, who also serves as foreign minister, was accompanied during his address by one of Chavez's daughters, Rosa Virginia, the president's son-in-law, Science and Technology Minister Jorge Arreaza and Attorney General Cilia Flores.

Chavez, who took office in 1999, was re-elected in October to another six-year term.

He was first diagnosed with cancer after complaining of pain in his pelvic region during a June 2011 official visit to Cuba. Since then, the former paratrooper has undergone four surgical procedures and courses of chemotherapy and radiation.

Venezuela's opposition said last Wednesday the official reports on Chavez's condition were ambiguous and demanded the appointment of a board of physicians to certify the president is fit to begin a new term. EFE