During admittance due to acute exacerbation of chronic obstructive lung disease will patience have an echocardiography to examine their pulmonary pressure. If patient have a tricuspidal return gradient above 40 mmHg, they will receive treatment with a phosphordiesterase-5-inhibitor, Sildenafil.
This trial will investigate whether patiens admitted with an acute exacerbation of chronic obstructive lung disease and pulmonary hypertension will benefit from a targeted pharmacological treatment.