Intra arterial injection of thiopentone causes –: (A) Vasospasm, (B) Vasodialation, (C) Necrosis of vessel wall, (D) Hypotension
Answer is A. Inadverent intra-arterial injection causes local vasoconstriction (vasospasm) and thrombosis which can cause ischemia and gangrene of the limb.
Note-IV injection cause generalized venodilatation due to which there is pooling of blood & hypotension. On the other hand intra-arterial injection results in localized vasospasm of the involved artery.