Echocardiographic Proof of Pulmonary Hypertension with Irreversible Increased Resistance in the Pulmonary Circulation as a Complication After Placement of a Ventriculo-Atrial Shunt for Internal Hydrocephalus - Trowitzsch, E; Ostrejz, M; Evers, D; Engert, J; Brode, P (European Journal of Pediatric Surgery, 1992)