Hypomagnesemia after spinal fusion
Larissa Rossato Chrun1, Paulo Ramos David João
1Unidade de Terapia Intensiva Pediátrica, Hospital Pequeno Príncipe, Curitiba, PR, Brazil. lary_rc@yahoo.com.br
Insights
Pediatric spinal fusion surgery significantly increases hypomagnesemia risk. Postoperative magnesium levels dropped dramatically, affecting 68% of patients, necessitating immediate monitoring and supplementation in pediatric intensive care units (ICUs).
Area of Science:
- Pediatric critical care medicine
- Orthopedic surgery outcomes
- Mineral metabolism
Background:
- Spinal fusion is a common orthopedic procedure in pediatric patients.
- Postoperative complications can arise from electrolyte imbalances.
- Hypomagnesemia, or low magnesium levels, is a potential concern after major surgery.
Purpose of the Study:
- To determine the incidence of hypomagnesemia in pediatric patients following spinal fusion.
- To compare preoperative and postoperative magnesium levels.
- To identify potential causes and clinical effects of hypomagnesemia.
Main Methods:
- Retrospective analysis of pediatric patients in the ICU post-spine fusion.
- Comparison of preoperative and first 24-hour postoperative serum magnesium, phosphorus, and calcium levels.
- Correlation analysis between magnesium reduction and surgical factors like fluid administration, blood transfusion, and fusion extent.
Main Results:
- A significant decrease in serum magnesium was observed post-surgery (1.8 to 1.4 mg/dL).
- The frequency of hypomagnesemia increased from 2% preoperatively to 68% postoperatively.
- Magnesium reduction correlated with fluid volume, transfused blood, and number of vertebrae fused; phosphorus and calcium also decreased significantly.
Conclusions:
- Spinal fusion surgery is associated with a high frequency of hypomagnesemia in pediatric patients.
- Routine magnesium level monitoring upon pediatric ICU admission is crucial.
- Prompt magnesium supplementation can mitigate potential complications.
Objectives:
To determine the frequency of hypomagnesemia in pediatric patients after spinal fusion, to verify whether postoperative magnesium levels were lower than preoperative levels and, if so, to identify possible causes and assess the clinical repercussions for patients.
Methods:
This was a retrospective descriptive study of pediatric patients admitted to a pediatric intensive care unit (ICU) after spine fusion surgery, between March 1 and August 31, 2011. Preoperative magnesium, phosphorus and total and ionized calcium concentrations were compared with the results of tests conducted during the first 24 hours after admission to the ICU.
Results:
A total of 45 patients were enrolled on the study. Median age was 13.1 years. Preoperative mean serum magnesium was 1.8 ± 0.2 mg/dL and postoperative serum magnesium was 1.4 ± 0.2 mg/dL, which was a significant reduction between the two periods (p < 0.001). The frequency of hypomagnesemia rose from 1 patient (2%) in the preoperative period to 31 patients (68%) during the postoperative period. There were also significant reductions in concentrations of phosphorus (p < 0.001) and total calcium (p < 0.001). There was a significant correlation between magnesium reductions and the volume of fluids administered during the surgery (p = 0.03), transfused blood volume (p < 0.001) and number of vertebrae fused (p < 0.05). Seven of the 31 patients with hypomagnesemia exhibited symptoms (22%).
Conclusion:
There was an elevated frequency of hypomagnesemia in patients who underwent spinal fusion. Serum magnesium should be assayed when patients are admitted to the pediatric ICU, so that appropriate supplementation can be initiated immediately, minimizing the risk of complications.
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