Background: Measurement of pulmonary diffusion capacity for carbon monoxide (DLCO) may be useful for assessing disease affecting the alveolar-capillary bed or the pulmonary vasculature. It was reported that hemodialysis (HD) therapy causes DLCO reduction via decrease of pulmonary capillary blood volume components. The aim of the study was to evaluate the effect of interdialytic weight gain on pulmonary function and especially DLCO. We further determined whether intravascular volume status, assessed by inferior vena cava diameter (IVCD) contributes to DLCO in patients on HD. Methods: Routine pulmonary function testing including forced expiratory volume in 1 second (FEV1), forced vital capacity (FVC), FEV1/FVC, forced mid-expiratory flow rate (FEF25–75), DLCO IVCD index and other echocardiographic parameters were evaluated in 20 patients (mean age 48.6 ± 18.3 years, mean dialysis duration 17.4 ± 19.2 months) on chronic HD, 1 hour after HD and after an interdialytic period (1 hour before HD therapy). Single-breath DLCO measurements were corrected for hemoglobin concentration (cDLCO). Results: Routine pulmonary function tests (spirometry) showed no significant changes in FEV1, FVC and FEF25–75 whereas a statistically significant fall in FEV/FVC was found. At the end of the interdialytic period a statistically significant increase in weight, IVCD index, left ventriculer diastolic diameter (LVDD), and diastolic blood pressure (DBP) were observed (P < 0.05). Using the single-breath DLCO, we found unchanged cDLCO at the end of the interdialytic period. There was no correlation of cDLCO with increases in weight, DBP, IVCD index, LVDD (P > 0.05). Conclusion: The accumulation of body water between dialyses has no significant influence on DLCO.
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Taskapan, H., Ulu, R., Gullu, H. et al. Interdialytic weight gain and pulmonary membrane diffusing capacity in patients on hemodialysis. Int Urol Nephrol 36, 583–586 (2004). https://doi.org/10.1007/s11255-004-8790-2
- Diffusion capacity
- Pulmonary function test