Right subclavian steal
Referral for investigation of markedly lower right brachial artery pressure compared to the left. The patient is a long-term smoker,
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Arm artery pressures as follows: Right Left
Brachial 140 177 mmHg
Radial 134 172
Ulnar 129 163
There appeared to be occlusion of the right subclavian artery at its origin with collateralisation of the vertebral arteries. Retrograde flow in the right vertebral artery supplied the right arm.
Occlusion of the right subclavian artery at its origin caused a right-sided subclavian steal and decreased pressures within the right arm arteries.