Key result
Peritoneal dialysis is linked to ~36% lower peak oxygen uptake versus healthy controls.
Why the study?
Decreased cardiorespiratory fitness increases cardiovascular risk in end-stage kidney disease, making early detection of impaired cardiopulmonary function clinically significant in peritoneal dialysis patients.
Does cardiopulmonary exercise testing reveal subclinical abnormalities in cardiopulmonary function in patients undergoing peritoneal dialysis compared to healthy controls?
Cross-Sectional (n=53)
Does cardiopulmonary exercise testing reveal subclinical abnormalities in cardiopulmonary function in patients undergoing peritoneal dialysis compared to healthy controls?
Absolute Event Rate: 16.39% vs 25.77%
p-value: p=<0.001
Patients undergoing peritoneal dialysis exhibit subclinical cardiopulmonary dysfunction and reduced cardiorespiratory fitness compared to healthy controls.
Reduced peak VO2 signals impaired fitness in peritoneal dialysis patients; cross-sectional data leaves open whether interventions improve outcomes.
BACKGROUND: Decreased cardiorespiratory fitness (CRF) related to cardiopulmonary function increases the risk of cardiovascular disease in patients with end-stage kidney disease. Thus, early detection of the cause of impaired cardiopulmonary function in patients undergoing peritoneal dialysis (PD) is of important clinical significance. METHODS: In this cross-sectional study, symptom-restricted cardiopulmonary exercise testing (CPET) was performed in 30 patients undergoing PD and in 23 age- and sex-matched healthy control subjects. A fixed workload was added every minute until fatigue, and breath-by-breath respiratory gas was analysed with an automated gas analyzer at 10-s intervals. RESULTS: The peak oxygen uptake (16.39 ± 0.83 vs. 25.77 ± 1.33 ml/kg/min p < 0.001) and the oxygen uptake at the anerobic threshold of patients undergoing PD (9.61 ± 0.34 vs. 14.55 ± 0.64 ml/kg/min; p < 0.001) were lower than in healthy control subjects, and both of these parameters correlated with body mass index and left atrial dimension. A steeper minute ventilation/carbon dioxide production slope (27.20 ± 0.68 vs. 24.29 ± 0.69；p < 0.01) and a lower end-tidal carbon dioxide partial pressure (37.93 ± 0.54 vs. 41.27 ± 0.83 mmHg；p < 0.05) were observed in patients undergoing PD. The oxygen pulse and oxygen uptake efficiency slope was smaller in patients undergoing PD. The Maximum heart rate (126.07 ± 4.01 vs. 149.96 ± 5.29 bpm；p < 0.01) and 1-min heart rate recovery (13.93 ± 1.52 vs. 24.39 ± 1.61 bpm；p < 0.01) were also lower in patients undergoing PD. CONCLUSION: Subclinical cardiopulmonary dysfunction may exist in patients with PD, and a reduction in CRF in patients undergoing PD is affected by both central and peripheral functions. CPET has potential value in revealing the mechanism of impaired CRF and in discovering subclinical abnormalities in cardiopulmonary function.
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Wu et al. (2022) conducted a cross-sectional in End-stage kidney disease undergoing peritoneal dialysis (n=53). Cardiopulmonary exercise testing (CPET) vs. Healthy control subjects was evaluated on Peak oxygen uptake (ml/kg/min) (p=<0.001). Cardiopulmonary exercise testing revealed that patients undergoing peritoneal dialysis had significantly lower peak oxygen uptake compared to healthy controls (16.39 vs 25.77 ml/kg/min; p<0.001).
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