Nitric Oxide Inhalation in Acute Pulmonary Hypertension After Cardiac Surgery Reduces Oxygen Concentration and Improves Mechanical Ventilation but Not Mortality - Westphal, K; Martens, S; Strouhal, U; Matheis, G; Hommel, K; Kessler, P (The Thoracic and Cardiovascular Surgeon, 1998)