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[Electrolyte disorders following colonic cleansing for imaging studies]
Mar Gutiérrez-Santiago1, Maite García-Unzueta, José A Amado
1Servicio de Medicina Interna, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Santander, Cantabria, Spain.
Medicina Clinica
|February 14, 2006
Summary
Bowel cleansing with oral phosphate salts often causes electrolyte imbalances like hyperphosphatemia and hypocalcemia. Clinicians should monitor patients, especially the elderly or those with kidney issues, for these potential risks.
Area of Science:
- Gastroenterology
- Nephrology
- Clinical Chemistry
Background:
- Bowel preparation is essential for radiologic and endoscopic procedures.
- Common bowel cleansing agents can disrupt calcium-phosphorus homeostasis.
Purpose of the Study:
- To investigate the effects of different bowel cleansing methods on serum electrolytes.
- To assess the incidence of electrolyte abnormalities following bowel preparation.
Main Methods:
- Observational prospective study of 47 inpatients undergoing barium enema or colonoscopy.
- Patients received bowel cleansing with low-salt polyethylene glycol (PEG), oral sodium phosphate, or phosphate enema.
- Serum electrolyte levels (calcium, phosphorus, sodium, potassium) and parathormone were monitored.
Main Results:
- Polyethylene glycol (PEG) caused mild serum sodium increases and potassium decreases.
- Oral phosphate led to significant increases in serum phosphorus and parathormone, and decreased calcium.
- Hyperphosphatemia occurred in 57% and hypocalcemia in 36% of oral phosphate users. Phosphate enemas caused hyperphosphatemia in 33% and hypocalcemia in 27%.
Conclusions:
- Bowel cleansing, particularly with oral phosphate, frequently induces electrolyte abnormalities like hyperphosphatemia and hypocalcemia.
- These changes are typically transient but pose a risk, especially for elderly patients and those with renal impairment.
- Awareness of these risks is crucial for safe clinical practice during bowel preparation.