Utility of intra-operative ultrasound in choosing the appropriate site for blood pressure monitoring in Takayasu's arteritis.

Takayasu's arteritis (TA) is rare, chronic progressive, pan-endarteritis involving the aorta and its main branches, with a specific predilection for young Asian women. Anaesthesia for TA patients is complicated by their severe uncontrolled hypertension, extreme arterial blood pressure differentials, aortic regurgitation (AR), end-organ dysfunction, stenosis/aneurysms of major blood vessels and difficulties encountered in monitoring arterial blood pressure. We present the usefulness of ultrasound during anaesthetic management of a 35-year-old woman posted for emergency caesarean section due to intra-uterine growth retardation, foetal tachycardia in active labour, who was already diagnosed to have TA along with moderate AR and uncontrolled hypertension, using epidural technique. The use of intra-operative doppler helped resolve the initial dilemma about the diagnosis and treatment of the differential blood pressure between the affected and the normal upper limb in the absence of prior arteriogram.