A 27-year-old male is seen in the Emergency Department having suffered seizures in the street
A 27-year-old male is seen in the Emergency Department having suffered seizures in the street. No history is available, and he remains obtunded when seen.
Observations reveal a heart rate of 119, a blood pressure of 100/78, a respiratory rate of 27, SpO2 of 94% on air, temperature of 39.2℃.
On examination, GCS is E1V2M5. You note injection sites in both antecubital fossae. There is a harsh systolic murmur, the loudest in the aortic area.
Investigations demonstrate:
| Haemoglobin | 117 | (130-180) |
| Platelets | 109 | (140-400) |
| White cell count | 19.7 | (3.6-11) |
| Neutrophils | 14.5 | (1.8-7.5) |
| Creatinine | 103 | (59-104) |
| C-reactive protein | 254 | (0-5) |
Post-contrast CT brain imaging demonstrates multiple contrast-enhancing lesions of various sizes in the middle cerebral artery territories bilaterally.
Which is the single most appropriate next investigation?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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