RESUMO
BACKGROUND: Late hemorrhagic disease of the newborn (HDN) may occur without an underlying disorder or as a secondary manifestation of an underlying disorder. It may be seen in fully breast-fed infants without a routine supplementation of vitamin K. In contrast, idiopathic late HDN is defined as HDN without the presence of any risk factor, such as gastroenteritis or use of antibiotics. Severe hemorrhagic symptoms frequently occur. METHODS: Between March 1987 and May 1997, we evaluated 15 infants with idiopathic late HDN, who were diagnosed by detailed history, physical examination and laboratory findings. RESULTS: The age (mean +/- SD) at onset of symptoms was 62.4 +/- 33.9 days. All children were breast-fed infants and were born at term from healthy mothers. The delivery histories were uneventful. There was no history of vitamin K administration at birth. Signs and symptoms of the patients were convulsions (47%), feeding intolerance and poor sucking (47%), irritability (33%) and pallor (20%). In physical examination; there was bulging or full fontanel in 10 patients (67%), diminished or absent neonatal reflexes in nine patients (60%) and ecchymosis in three patients (20%). Before administration of vitamin K, prothrombin time (PT) was 76.1 +/- 43.0 s and partial thromboplastin time (PTT) was 123.4 +/- 68.8 s. Six to 12 h after administration of vitamin K, PT was 15.6 +/- 1.8 s and PTT was 33.4 +/- 1.0 s. Neurologic, gastrointestinal and skin hemorrhagic findings were found in 11 (73%), three (20%) and three patients (20%), respectively. There were both neurologic and skin bleeding symptoms in two patients. The mortality in the present study was 33%. CONCLUSIONS: Late HDN results in severe hemorrhage, especially hemorrhage in the central nervous system. Administration of vitamin K (1 mg, i.m.) at the birth can reduce these severe complications.
