Severe TBI With a Contusion Expanding on Repeat Imaging
A 34-year-old woman, restrained driver, GCS 7 (E1 V2 M4) after a motor vehicle crash. Intubated. Initial CT: right frontal contusion 12 mm, no midline shift, small traumatic subarachnoid hemorrhage. ICP monitor placed: ICP 18-22 mmHg, CPP 65 mmHg on propofol sedation, MAP 85. She is on 0.9% saline at 100 mL/h, serum sodium 139, osmolality normal. Repeat CT at 8 hours shows the contusion now 28 mm with 4 mm midline shift and effacement of the right lateral ventricle. ICP now 26 mmHg. Pupils are 3 mm bilaterally and reactive. She has a right frontal external ventricular drain that is clamped per protocol.
1. Walk through your tiered management over the next 60 minutes, and state what you would NOT do.
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Stepwise, time-critical: (1) Confirm and correct reversible causes - head of bed 30 degrees, midline neck, loose C-collar if not needed, ensure sedation adequate (propofol), check PaCO2 (target 35-38, do not hyperventilate prophylactically), verify EVD patency and unclamp it to drain CSF if the protocol allows - a clamped EVD in a patient with rising ICP and ventricular effacement is a fixable problem. (2) Osmotherapy: hypertonic saline (e.g., 3% bolus) or mannitol 0.5-1 g/kg; given her sodium 139 and normal osmolality, either is reasonable, but hypertonic saline is preferred if she is hypotensive (she is not) and mannitol is avoided if renal function is poor. (3) If ICP remains >22 despite these, brief hyperventilation to PaCO2 30-35 as a bridge to the OR. (4) Urgent neurosurgical consult for decompressive hemicraniectomy/contusion evacuation given the expansion and 4 mm shift. What NOT to do: do not give steroids (CRASH trial - harm in TBI), do not use prophylactic hyperventilation to <30, do not use barbiturates or hypothermia before surgical options are considered, and do not keep the EVD clamped when it is a drainable source of ICP.
2. Her serum sodium is 139 and you gave 3% saline. What is your target sodium and how do you avoid overshoot?
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For ICP control, a reasonable target is a serum sodium of 145-155 mEq/L (or an osmolality of 300-320 mOsm/kg), using boluses of 3% saline (e.g., 150-250 mL) titrated to ICP and neurologic exam rather than to a fixed number. Avoid overshoot by: checking sodium every 4-6 hours (more often after boluses), using intermittent boluses rather than a continuous infusion unless needed, and recognizing that a rapid rise of >10-12 mEq/L in 24 hours risks osmotic demyelination - but in acute ICP crisis, the priority is ICP control and the demyelination risk is lower with acute (hours) correction than with chronic hyponatremia correction. Watch for complications of hypertonic saline: hyperchloremic metabolic acidosis, volume overload/pulmonary edema, and renal injury. If she develops polyuria and rising sodium, consider diabetes insipidus and treat with desmopressin rather than continuing to chase with saline.
3. At what point does the expanding contusion change from a medical to a surgical problem, and what determines that?
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The trigger is not a single number but the combination of: (a) contusion volume/expansion (here 12 to 28 mm with new 4 mm midline shift and ventricular effacement), (b) refractory ICP >22-25 mmHg despite tier-1 and tier-2 measures, (c) clinical or radiographic evidence of herniation or progressive deterioration, and (d) the presence of a surgically accessible lesion. For contusions, the evidence (DECRA for diffuse injury; STITCH for lobar ICH) does not directly apply, but the principle is that a mass lesion with shift and refractory ICP is a surgical indication - decompressive hemicraniectomy with or without contusion evacuation. The judgment call: do not wait for a fixed ICP threshold if there is progressive shift and a drainable/clottable lesion; conversely, do not operate on a stable patient with a small contusion just because it is a contusion. Involve neurosurgery early and reassess after each tier.