Irrigation Settings for Pediatric PCNL
For pediatric patients undergoing PCNL, use isotonic saline (normal saline) at room temperature (22°C) with minimized irrigation volumes, particularly when using minimally invasive techniques like mini-PCNL or Microperc.
Irrigation Solution Type
Use isotonic saline (0.9% NaCl) as the standard irrigation fluid 1. Hypotonic solutions like distilled water cause electrolyte shifts and should be avoided 1. While the major guidelines 2, 3 don't specifically address irrigation solution composition for pediatrics, the most recent comprehensive review (2026) clearly demonstrates that isotonic saline maintains electrolyte stability during PCNL 1.
Temperature Considerations
Room temperature irrigation (22°C) is preferable for pediatric patients for several key reasons:
Reduced bleeding risk: Room temperature irrigation significantly decreases intraoperative blood loss compared to body temperature (37°C) irrigation 4. This is particularly critical in pediatric patients with smaller blood volumes.
Trade-off with hypothermia: While body temperature irrigation reduces hypothermia and shivering rates 5, 4, the bleeding reduction with cooler irrigation outweighs this concern in most pediatric cases, especially given their smaller kidney size and higher bleeding risk per unit volume.
Practical approach: Monitor core temperature closely and use warming blankets, warmed IV fluids, and increased ambient room temperature to compensate for cooler irrigation rather than warming the irrigation fluid itself 4.
Volume Management
Minimize irrigation volume aggressively in pediatric patients:
Children receiving Microperc (4.8-Fr) required significantly less irrigation volume than those receiving mini-PCNL (12-16-Fr) 6
Older age, higher BMI, and larger stone burden independently predict higher irrigation volumes needed 6
Recent evidence shows PCNL can be safely performed with dramatically reduced irrigation (mean 6,600 mL vs. traditional 19,125 mL) without compromising outcomes 7
Excessive irrigation volume correlates with systemic absorption, hemodynamic instability, and electrolyte disturbances 1
Practical Irrigation Strategy
Set up the irrigation system as follows:
Use passive gravity-based irrigation with bags elevated to create hydrostatic pressure 8
Irrigate through the inflow port of the nephroscope sheath (creates lower intrarenal pressure of 19.1 mmHg vs. 32.7 mmHg through outflow port) 9
Apply frequent suction - this significantly reduces intrarenal pressure across all configurations 9
Consider removing the rigid nephroscope sheath when possible to lower intrarenal pressure (14.7 mmHg without vs. 19.1 mmHg with sheath) 9
Additives to Consider
While not standard in pediatrics, evidence from adult studies suggests:
- Tranexamic acid in irrigation reduces blood loss and transfusion rates without added complications 1
- Povidone-iodine or antibiotic irrigation may reduce postoperative fever and sepsis 1
These should be considered on a case-by-case basis in high-risk pediatric patients.
Critical Safety Points
Monitor and limit operative time - both irrigation volume and operative duration consistently correlate with complications 1. Stone burden is the only independent predictor of both operative time and postoperative complications in pediatric bilateral PCNL 6.
Use minimally invasive techniques when possible - Microperc and mini-PCNL achieve excellent stone-free rates (93.3%) with acceptable complication rates (53.3%, mostly Clavien 1-2) in pediatric patients 6. The smaller instruments inherently require less irrigation.
Maintain ALARA principles for radiation exposure during fluoroscopic guidance 3.