Vitamin K deficiency-induced spontaneous haemopericardium and cardiac tamponade in an infant with alpha-1 antitrypsin deficiency: a case report.

Alpha-1-antitrypsin deficiency can lead to vitamin K deficiency in young infants even with adequate prophylaxis. Spontaneous haemorrhagic pericardial effusion was a new manifestation of vitamin K deficiency bleeding in our patient and should be considered and ruled out in young infants who present with acute anaemia and poor clinical condition.