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Evaluation of cerebrovascular reactivity in children [corrected] with chronic renal failure
K Szprynger1, J Kwieciński, M Szczepańska
1Department of Pediatrics, Clinic of Nephrology, Endocrinology, and Metabolic Disorders of Childhood, Silesian School of Medicine, Zabrze, Poland.
Insights
Children with chronic renal failure (CRF) show altered cerebral blood flow. Uremic children on conservative treatment or CAPD exhibit hyperreactive cerebral circulation, potentially due to impaired autoregulation.
Area of Science:
- Pediatric Nephrology
- Neurology
- Vascular Physiology
Background:
- Children with chronic renal failure (CRF) can experience developmental issues and encephalopathy.
- Cerebral blood flow regulation may be compromised in pediatric uremia.
Purpose of the Study:
- To investigate cerebral circulation efficiency in children with uremia.
- To assess cerebrovascular reactivity in pediatric CRF patients undergoing different treatments.
Main Methods:
- Evaluated cerebral blood flow velocity in middle cerebral arteries (MCA) using Doppler flowmetry.
- Measured vascular reactivity via hyperventilation challenges and CO2 response.
- Compared groups: conservative treatment, continuous ambulatory peritoneal dialysis (CAPD), maintenance hemodialysis (HD), and healthy controls.
Main Results:
- Baseline MCA blood flow velocity was higher in children on conservative treatment and CAPD compared to HD and controls.
- Cerebrovascular reactivity was significantly higher in children on conservative treatment and CAPD versus HD and controls.
- Elevated vascular reactivity suggests potential impaired cerebral blood flow autoregulation.
Conclusions:
- Children with CRF, particularly those on conservative management or CAPD, demonstrate hyperreactivity in cerebral circulation.
- Impaired autoregulation of cerebral blood flow is a likely contributor to observed hyperreactivity.
- Further research is needed to fully understand cerebrovascular reactivity in uremic children.
Abstract:
Developmental disturbances and encephalopathy have been observed in children with chronic renal failure (CRF). The aim of this study was to investigate the efficiency of the cerebral circulation in uremic children. The study group consisted of 10 children with CRF on conservative treatment, 8 children on continuous ambulatory peritoneal dialysis (CAPD), and 8 children on maintenance hemodialysis (HD). Examination was performed using a TC2-64B, EME Doppler flowmeter machine and capnograph Datex, Normocap. Blood flow velocity in both middle cerebral arteries (MCA), at rest and after spontaneous hyperventilation for 30 s, was analyzed. The vascular reactivity coefficient was calculated as the percentage ratio of decline of blood flow velocity in MCA to PCO2 decrease. Baseline mean blood flow velocities of MCA in euvolemic children under conservative treatment and on CAPD were significantly higher than those in children on HD and healthy control children. The highest value of the vascular reactivity coefficient was significantly higher in the group of children with CRF on conservative and CAPD treatment, than in children on HD and healthy controls. We suggest that hyperreactivity of the cerebral circulation could be the result of impaired autoregulation of blood flow. Evaluation of cerebrovascular reactivity in uremic children requires further examination.