Postoperative methemoglobinemia with associated G-6-P-D deficiency in infant cardiac surgery--enigmas in diagnosis and management.

Methemoglobinemia could cloud a turbulent postoperative course in infant cardiac surgery by interfering with the diagnosis of various critical conditions. Issues surrounding the treatment with methylene blue in the presence of glucose-6-phosphate dehydrogenase (G-6-P-D) deficiency are highlighted.