Anesthetic agent with vasoconstrictor is contraindicated in?

The use of vasoconstrictors (epinephrine or adrenaline) along with a local anesthetic is usually avoided in case of ring block or finger block as it causes severe vasocontriction (direct alpha adrenergic effect). As this vaso-constriction in the end aeries can lead to gangrene formation. Ref: Neural blockade in clinical anesthesia and management of pain, Issue 494 - Page 124, By Michael J. Cousins, Phillip O. Bridenbaugh; Fundamentals of Surgical Practice By Andrew Kingsnoh, Douglas Bowley, Page 147.