1. Clinical Overview
Sorbitol Solution (1.2%) is a sterile, non-pyrogenic, aqueous solution of sorbitol, a hexahydric sugar alcohol (polyol). It is primarily used as an irrigating fluid in urological procedures, particularly Transurethral Resection of the Prostate (TURP) and other endoscopic surgeries. Its 1.2% concentration is slightly hypotonic to plasma, providing a clear surgical field with minimal risk of hemolysis when absorbed systemically. It is not intended for intravenous injection or oral consumption as a laxative, which uses higher concentrations.
| Onset | Duration | Bioavailability |
|---|---|---|
| Immediate upon contact as an irrigant. | Duration is limited to the time of irrigation during the surgical procedure. | Not applicable (N/A) for irrigant use. If absorbed systemically during surgery, it is nearly complete via peritoneal and venous sinuses. |
2. Mechanism of Action
As an irrigant, it provides a clear, electrolyte-free, non-conductive medium for endoscopic surgery using monopolar electrocautery. Its osmotic properties (when absorbed) draw fluid into the intravascular space, leading to diuresis. It is metabolized to fructose, bypassing the rate-limiting phosphofructokinase step of glycolysis.
3. Indications & Uses
- Irrigation fluid during Transurethral Resection of the Prostate (TURP)
- Irrigation fluid during other transurethral endoscopic urological surgeries (e.g., bladder tumor resection)
4. Dosage & Administration
Adult Dosage: Dosage is not fixed. Used as a continuous irrigation fluid during surgery. Typical volumes range from 10 to 30 liters per procedure, depending on duration and vascularity of the surgical field. Irrigation pressure should be maintained as low as possible (typically 60-80 cm H2O) to minimize systemic absorption.
Administration: For sterile irrigation only. Use with appropriate urological irrigation sets. Warm to room or body temperature before use to prevent patient hypothermia. Must be used with continuous flow to maintain visibility and regulate pressure. Never pressurize container excessively. Do not mix with other drugs unless compatibility is known.
5. Side Effects
Common side effects may include:
- Transient mild diuresis post-procedure (if absorbed)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Loop Diuretics (Furosemide) | Additive diuretic effect; may help excrete absorbed fluid and correct hyponatremia. Often used therapeutically if TURP syndrome occurs. | Moderate |
| Hypertonic Saline (3% NaCl) | Used to treat severe symptomatic hyponatremia resulting from massive sorbitol absorption. A direct therapeutic interaction. | Major |
| Other Irrigants (Glycine, Mannitol) | Not used concurrently. Different risk profiles for TURP syndrome. | N/A |
7. Patient Counselling
- This is a surgical irrigant; patient counselling is primarily pre-operative.
- Inform the surgeon/anesthetist of any history of kidney, heart, or liver disease.
- Report any history of rare metabolic disorders like fructose intolerance.
8. Toxicology & Storage
Overdose: Overdose' in this context refers to excessive systemic absorption (>2-3L). Symptoms are those of TURP Syndrome and fluid overload: Severe hyponatremia (Na+ <120 mEq/L), nausea, vomiting, confusion, visual disturbances (blurred vision, blindness), bradycardia, hypertension followed by hypotension, pulmonary edema, seizures, coma, and cardiovascular collapse. Metabolic acidosis may also occur.
Storage: Store at room temperature (15-25°C). Protect from freezing and excessive heat. Do not use if the container is damaged, leaking, or the solution is cloudy or contains particulates. Keep out of reach of children. For single use in one patient. Discard any unused portion.