Clinical Review

Compartment Syndrome in Children: Diagnosis and Management

Am J Orthop. 2016 January;45(1):19-22

References

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In a series of 33 children with CS, Bae and colleagues³¹ found that the 5 Ps were relatively unreliable in making a timely diagnosis. The authors also found that increased analgesic use was documented a mean of 7.3 hours before a change in vascular status and that it was a more sensitive indicator of CS in children. The resulting recommendation is that children at risk for CS be closely monitored for the 3 As (increasing analgesic requirement, anxiety, agitation).³²

Regional anesthesia is used to control postoperative pain in adults and children.^33,34 Injudicious use may mask the primary symptom (pain) of CS.^32,35-38 Use of regional anesthesia in patients at high risk for CS is highly discouraged.

Although CS is a clinical diagnosis, compartment pressure measurements can be useful in making decisions in certain clinical scenarios. In an obtunded child or in a child with severe mental and communication disability, such a measurement can help confirm or rule out the diagnosis.

Normal compartment pressures are higher in children than in adults. Staudt and colleagues³⁹ compared pressures in 4 lower leg compartments of 20 healthy children and 20 healthy adults. Mean pressure varied from 13.3 mm Hg to 16.6 mm Hg in children and from 5.2 mm Hg to 9.7 mm Hg in adults—indicating higher normal pressure in lower leg compartments in children.

Compartment pressures were reported highest within 5 cm of the fracture site.⁴⁰ When clinically indicated, they should be measured in that area in an injured extremity. The pressure threshold that requires fasciotomy is debatable. Intracompartmental pressures of 30 to 45 mm Hg, or measurements less than 30 mm Hg of diastolic blood pressure (pressure change = diastolic blood pressure – compartment pressure), have been recommended as cutoffs by some authors.^41-44 As resting normal compartment pressures are higher in children, these cutoffs cannot be used as reliably in children as in adults. Direct measurement of intracompartmental pressure is invasive and can be difficult in an agitated, awake child. The potential utility of near-infrared spectroscopy in the diagnosis of increased compartment pressure has been reported.^45,46 This method uses differential light absorption properties of oxygenated hemoglobin to measure tissue ischemia—similar to the method used in pulse oximetry. Compared with pulse oximetry, near-infrared spectroscopy can sample deeper tissue (3 cm below skin level). Shuler and colleagues⁴⁵ reported near-infrared spectroscopy findings for 14 adults with acute CS. Lower tissue oxygenation levels correlated with increased intracompartmental pressures, but the authors could not define a cutoff for which near-infrared spectroscopy measurements would indicate significant tissue ischemia. Use of this method in diagnosing CS in children was described in a case report.⁴⁶

CS remains a clinical diagnosis. Informing family and staff about the signs and symptoms of this syndrome and closely monitoring analgesic use in these patients are crucial. Compartment pressure measurements can be used when the diagnosis is unclear, particularly in noncommunicative patients, but these values should be interpreted with caution.

Treatment

Once CS is diagnosed, emergent fasciotomy and decompression are indicated. Surgeons planning fasciotomy should be aware of the definitive treatment of the CS etiology. Treatment of clotting deficiency in cases caused by excessive bleeding, fracture fixation, and vascular repair may be indicated during fasciotomy and decompression.

Summary

Increased need for analgesics is often the first sign of CS in children and should be considered the sentinel alarm for ongoing tissue necrosis. CS remains a clinical diagnosis, and compartment pressure should be measured only as a confirmatory test in noncommunicative patients or when the diagnosis is unclear. Children with supracondylar humeral fractures, forearm fractures, tibial fractures, and medical risk factors for coagulopathy are at increased risk and should be monitored closely. When the diagnosis is made promptly and the condition is treated with fasciotomy, good long-term clinical results can be expected.