Exercise Testing to Estimate Survival in Pulmonary Hypertension

• Autores: Herman Groepenhoff, Anton Vonk-Noordegraaf, Anco Boonstra, Marieke D. Spreeuwenberg, Pieter E. Postmus, Harm J. Bogaard
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 40, Nº. 10, 2008, págs. 1725-1732
• Idioma: inglés
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• Resumen

  • Background: The 6-min walk distance (6MWD) predicts survival in pulmonary hypertension (PH). The peak oxygen consumption (V[spacing dot above]O2peak) measured during a cardiopulmonary exercise test (CPET) also relates to survival in PH, and it is unknown how the prognostic information from measurements of ventilatory responses and gas exchange during CPET compares to the prognostic information obtained by the 6MWD alone. The aims of our study were to compare prognostic values of different exercise parameters in PH and to assess whether CPET adds prognostic value to the information from the 6MWD.

    Methods: After baseline right-heart catheterization and exercise testing, survival was assessed in a cohort of 115 PH patients.

    Results: During the 4 yr of follow-up, 18 patients died. At baseline, pulmonary arterial pressure was 49 +/- 17 mm Hg, the slope relating minute ventilation to carbon dioxide output (V[spacing dot above]E/V[spacing dot above]CO2slope) = 45 +/- 11, V[spacing dot above]O2peak = 15 +/- 6 mL[middle dot]kg-1[middle dot]min-1, increase in O2 pulse from rest to peak exercise ([DELTA]O2 pulse) = 5 +/- 2 mL[middle dot]beat-1, and 6MWD = 445 +/- 128 m. For the prediction of mortality, the areas under the receiver operating curves were very similar for the different parameters and ranged from 0.69 to 0.74. Patients with a V[spacing dot above]E/V[spacing dot above]CO2slope < 48, V[spacing dot above]O2peak > 13.2 mL[middle dot]kg-1[middle dot]min-1, [DELTA]O2 pulse > 3.3 mL[middle dot]beat-1, or a 6MWD > 399 m had a higher cumulative survival (P < 0.05). Multivariable Cox regression with a forward selection procedure showed that only [DELTA]O2 pulse improved the univariate 6MWD prediction model significantly (P < 0.05).

    Conclusion: CPET parameters predict survival in PH patients and add marginally to the prognostic value of the 6MWD.