Frequency, Clinical Characteristics, and Respiratory Parameters of Hepatopulmonary Syndrome

Lima, Beatriz L.G.; França, Alex V.C.; Pazin-Filho, Antonio; Araújo, Whemberton M.; Martinez, José A.B.; Maciel, Benedito C.; Simões, Marcus V.; Terra-Filho, João; Martinelli, Ana L.C.
January 2004
Mayo Clinic Proceedings;Jan2004, Vol. 79 Issue 1, p42
Academic Journal
• Objectives: To determine the frequency and the clinical characteristics of hepatopulmonary syndrome (HPS) in cirrhotic candidates for orthotopic liver transplantation and to identify the major respiratory parameters predictive of the presence of changes in arterial oxygenation. • Patients and Methods: Patients underwent transthoracic contrast-enhanced echocardiography, pulmonary scintigraphy, pulmonary function test with diffusing capacity of lung for carbon monoxide (DLCO), and measurement of arterial blood gases. • Results: Fifty-six patients were studied. Twenty-five patients (45%) presented with intrapulmonary vascular dilatations, but only 9 (16%) fulfilled the criteria for HPS. The clinical or demographic characteristics considered did not differ in the patients with and without HPS. The DLCO value was significantly lower in patients with HPS (P=.01). However, 32 (80%) of 40 patients with low DLCO values did not fulfill the criteria for HPS. An alveolar arterial oxygen gradient (AaPo[sub 2]) of more than 20 mm Hg showed a higher diagnostic accuracy (91%) in the assessment of HPS than did the DLCO of less than 80% predicted (41%) and the AaPo[sub 2] of more than 15 mm Hg (71%). • Conclusions: The AaPo[sub 2] proved to be a more reliable index than Pao[sub 2] and DLCO for the determination of changes in arterial oxygenation in HPS. The DLCO does not seem to be a good marker for HPS screening. Intrapulmonary vascular dilatations were frequent, even in patients who did not fulfill the criteria for HPS.


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