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Canadian Journal of Anesthesia, Vol 32, 429-434, Copyright © 1985 by Canadian Anesthesiologists' Society

A Clinical Sign to Predict Difficult Tracheal Intubation: A Prospective Study

S. RAO MALLAMPATI MD1, STEPHEN P. GATT MD1, LAVERNE D. GUGINO PHD, MD1, SUKUMAR P. DESAI MD1, BARBARA WARAKSA CRNA1, DUBRAVKA FREIBERGER MD1, and PHILIP L. LIU MD1

1 Department of Anaesthesia, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts

Address correspondence to: Dr. S. Rao Mallampati, Brigham and Women's Hospital, 75 Francis Street, Boston, Massachusetts 02115.

It has been suggested that the size of the base of the tongue is an important factor determining the degree of difficulty of direct laryngoscopy. A relatively simple grading system which involves preoperative ability to visualize the faucial pillars, soft palate and base of uvula was designed as a means of predicting the degree of difficulty in laryngeal exposure. The system was evaluated in 210 patients. The degree of difficulty in visualizing these three structures was an accurate predictor of difficulty with direct laryngoscopy (p < 0.001).

Key Words: INTUBATION, ENDOTRACHEAL: complications, difficult intubation • ANAESTHETIC TECHNIQUES: laryngoscopy




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