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Exertional fatigue in patients with CKD.
Jamie H Macdonald1, Lee Fearn, Mahdi Jibani
1College of Health and Behavioural Sciences, Bangor University, Bangor, United Kingdom. j.h.macdonald@bangor.ac.uk
Summary
Patients with chronic kidney disease (CKD) experience significant exertional fatigue during daily activities due to impaired oxygen delivery, particularly from uncompensated anemia. Addressing the entire oxygen transport chain is crucial for managing CKD fatigue.
Area of Science:
- Nephrology
- Exercise Physiology
- Cardiovascular Physiology
Background:
- Fatigue is a common and debilitating symptom in chronic kidney disease (CKD).
- Mechanisms underlying CKD-related fatigue are not well understood, partly due to imprecise definitions.
- This study specifically examines exertional fatigue during simulated daily living activities, focusing on oxygen delivery and utilization.
Purpose of the Study:
- To investigate the mechanisms of exertional fatigue in patients with non-dialysis-dependent CKD.
- To compare exertional fatigue and physiological responses between CKD patients and healthy controls during simulated daily activities.
- To identify factors contributing to fatigue in CKD, including oxygen transport and utilization.
Main Methods:
- A matched-cohort study design comparing 13 CKD patients (stages 3b-4) with 13 healthy controls matched for key characteristics.
- Participants underwent incremental cycle ergometer tests simulating activities of daily living at various metabolic equivalent tasks (METs).
- Exertional fatigue was assessed using Rating of Perceived Exertion (RPE), alongside multidimensional fatigue scales (UK SF-36 Vitality, FACIT-Fatigue) and physiological measures (cardiac output, arterial oxygen content, blood lactate).
Main Results:
- CKD patients reported significantly higher RPE at 2.4 and 3.1 METs compared to controls, indicating greater perceived exertion.
- Patients exhibited higher scores on fatigue subscales (UK SF-36 Vitality, FACIT-Fatigue), confirming increased chronic fatigue.
- Physiological findings included decreased arterial oxygen content and reduced oxygen delivery in CKD patients, alongside increased respiratory exchange ratio and blood lactate production, despite unchanged cardiac output and oxygen extraction.
Conclusions:
- Patients with non-dialysis-dependent CKD experience substantial exertional fatigue during simulated daily activities.
- Inadequate compensation for mild anemia contributes significantly to reduced oxygen delivery and subsequent fatigue.
- Effective management of fatigue in CKD requires interventions targeting not only anemia but the entire oxygen transport chain.
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