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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Pleural fluid pH in malignant effusions. Diagnostic, prognostic, and therapeutic implications.

STUDY OBJECTIVE: To determine whether the measurement of pleural fluid pH in malignant effusions has diagnostic use, predicts survival, and has therapeutic implications. DESIGN: A prospective comparison of cytologic examinations and pleural biopsy results, survival, and response to chemical pleurodesis with tetracycline in patients with normal-pH (7.30 or greater) and low-pH (less than 7.30) malignant pleural effusions. SETTING: Academic medical center, university referral hospital, city hospital, and Veterans Administration hospital. PATIENTS: Sixty patients with malignant pleural effusions, proven at either initial thoracentesis by cytologic examination or within 4 months of initial thoracentesis by repeat thoracentesis, thoracotomy, or autopsy, were followed until death. INTERVENTION: Twenty-one patients, 12 with normal pleural fluid pH and 9 with low pleural fluid pH, were treated with tube thoracostomy and intrapleural tetracycline for symptomatic, recurrent pleural effusions. MAIN RESULTS: The 20 patients with low-pH malignant effusions had a significantly greater positivity on initial pleural fluid cytologic evaluation, a shorter mean survival, and a poorer response to tetracycline pleurodesis compared with 40 patients with normal-pH malignant effusions. CONCLUSIONS: Determination of pleural fluid pH in malignant effusions provides a rational approach to further diagnostic testing, prognostic information, and a rationale for palliative treatment.[1]

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