Medicine Subclavian steal phenomenon is due to: A Block in the first part of the Subclavian artery B Block in the second part of the Subclavian artery C Block in the third part of the Subclavian artery D Vertebral venous thrombosis 💡 Explanation Subclavian steal phenomenon is due to: ✓ Correct Answer: A. Block in the first part of the Subclavian artery