• Revista clínica española · Apr 1997

    Comparative Study

    [Efficacy of acetazolamide treatment of patients with hypercapnia and superimposed metabolic alkalosis].

    • J M Prieto de Paula, V Villamandos Nicás, P Cancelo Suárez, A del Portillo Rubí, E Guillem Ares, A Prada Mínguez, and H Sanz de la Fuente.
    • Servicio de Medicina Interna, Hospital Santos Reyes, Aranda de Duero, Burgos.
    • Rev Clin Esp. 1997 Apr 1;197(4):237-40.

    BackgroundMetabolic alkalosis usually complicates the evolution of patients with hypercapnia under diuretic or steroid therapy. The objective of this study was to analyze the efficiency of therapy with acetazolamide, a reversible carbonic anhydrase inhibitor, in this condition.Patients And MethodsProspective study conducted at our hospital from June 1994 to March 1996, with 45 patients who had chronic respiratory acidosis and metabolic alkalosis. After a previous stabilization of the patient and eventually the discontinuation of diuretic or corticosteroid drugs fro 24-48 hours, 500 or 750 mg of acetazolamide were administered daily for 48 hours. Later, variations both in arterial gasometry and venous electrolytes were analyzed by comparing two means of paired data.ResultsAfter therapy with acetazolamide a clinical improvement was observed in patients, a decrease in PaCO2, pH and CO3H (p < 0.001) and an increase in PaO2 (p < 0.001). Hypochloremia (82.2%) and hypopotassemia (33.3%) were the most common electrolytic abnormalities before therapy. Both abnormalities improved significantly after the administration of acetazolamide. In five patients (11.1%) acetazolamide was discontinued when metabolic acidosis appeared, which only in three cases was associated with acidemia. No secondary effects were observed.ConclusionsAcetazolamide is an efficient alternative for treatment of patients with respiratory acidosis and metabolic alkalosis, particularly when other more common measures in this condition (discontinuation of diuretics and/or volemic replacement) have failed or are contraindicated. On the other hand, the emergence of relevant secondary effects is unlikely.

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