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Changes in renal function during acute spinal cord injury: implications for pharmacotherapy
V Rodríguez-Romero1, L Cruz-Antonio, R E Franco-Bourland
1Departamento de Farmacología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, México City, México.
Spinal Cord
|April 24, 2013
Summary
Acute spinal cord injury (SCI) significantly impairs glomerular filtration rate (GFR) but not tubular secretion (TS). This finding is crucial for managing medications in early cord-injured patients to prevent toxicity.
Area of Science:
- Nephrology
- Neurology
- Pharmacology
Background:
- Spinal cord injury (SCI) can impact systemic physiological functions, including renal function.
- Understanding renal changes post-SCI is vital for drug administration and patient management.
Purpose of the Study:
- To investigate alterations in renal function, specifically glomerular filtration rate (GFR) and tubular secretion (TS), during the acute phase of spinal cord injury.
- To characterize the impact of SCI on pharmacokinetic parameters of renally eliminated substances.
Main Methods:
- Laboratory investigation using Sprague Dawley rats subjected to experimental spinal cord contusion or laminectomy (control).
- Assessment of GFR using iohexol clearance and TS using p-aminohippuric acid (PAH) clearance 24 hours post-injury.
- Pharmacokinetic analysis of iohexol and PAH concentrations in blood via high-performance liquid chromatography.
Main Results:
- A significant decrease in iohexol clearance was observed post-SCI, indicating reduced GFR.
- Increased blood concentrations and half-life of iohexol were noted in injured rats.
- P-aminohippuric acid (PAH) clearance, reflecting tubular secretion, remained unchanged after spinal cord injury.
Conclusions:
- Acute spinal cord injury primarily affects glomerular filtration rate (GFR), while tubular secretion (TS) remains largely unaltered.
- These findings highlight the importance of considering altered renal function in early SCI management.
- Adjusting drug dosages based on impaired GFR is essential to prevent potential toxicity and therapeutic failure in patients with acute SCI.
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