Comment on

• Significance of pulmonary arterial pressure and diffusion capacity of the lung as prognosticator in patients with idiopathic pulmonary fibrosis.

  Hamada K, Nagai S, Tanaka S, Handa T, Shigematsu M, Nagao T, Mishima M, Kitaichi M, Izumi T. Hamada K, et al. Chest. 2007 Mar;131(3):650-656. doi: 10.1378/chest.06-1466. Epub 2007 Feb 22. Chest. 2007. PMID: 17317730
• Pulmonary hypertension and pulmonary function testing in idiopathic pulmonary fibrosis.

  Nathan SD, Shlobin OA, Ahmad S, Urbanek S, Barnett SD. Nathan SD, et al. Chest. 2007 Mar;131(3):657-663. doi: 10.1378/chest.06-2485. Chest. 2007. PMID: 17356077
• Sildenafil improves walk distance in idiopathic pulmonary fibrosis.

  Collard HR, Anstrom KJ, Schwarz MI, Zisman DA. Collard HR, et al. Chest. 2007 Mar;131(3):897-899. doi: 10.1378/chest.06-2101. Chest. 2007. PMID: 17356110 Free PMC article. Clinical Trial.