MedGen

Beta-aminoisobutyric acid (BAIB) is a product of pyrimidine catabolism. Excretion of BAIB in urine is a benign 'metabolic polymorphism' present in many human populations (Scriver and Perry, 1989). [from OMIM]

Pulmonary hemorrhage is a bleeding within the lungs. Older children and adults may spit blood or bloody sputum. Neonates, infants and young children usually do not spit up blood. Anemia, pulmonary infiltrates, increasingling bloody return on BAL and the presence of hemosiderin-laden macrophages in broncho-alveolar lavage (BAL) fluid or lung biopsy can diagnose lung bleeding. Alveolar macrophages contain phagocytosed red blood cells and stain positive for hemosiderin, a product of hemoglobin degradation, after about 48-72 hours following pulmonary hemorraghe. Previous or recurrent bleeding can thus be distinguished from fresh events. A differentiation into local or diffuse is of importance. Also differentiate if pulmonary hemorrhage is due to a primary lung disorder or a manifestation of a systemic disease. [from HPO]

A type of of pulmonary hemorrhage that originates from the pulmonary microcirculation, including the alveolar capillaries, arterioles, and venules. It presents with hemoptysis, anemia, diffuse lung infiltration, and acute respiratory failure. The diagnosis is confirmed by the observation of the accumulation of red blood cells, fibrin, or hemosiderin-laden macrophage in the alveolar space on pathologic biopsy. Hemosiderin, a product of hemoglobin degradation, appears at least 48-72 hours after bleeding and is helpful in distinguishing diffuse alveolar hemorrhage from surgical trauma. Mild interstitial thickening, organizing pneumonia, or diffuse alveolar damage can also be seen. [from HPO]