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Difficult intubation in acromegalic patients: incidence and predictability
H Schmitt1, M Buchfelder, M Radespiel-Tröger
1Department of Anesthesiology, Friedrich-Alexander University, Erlangen-Nuremberg, Germany. hubert.schmitt@kfa.imed.uni-erlangen.de
Anesthesiology
|June 22, 2000
Summary
Acromegalic patients have a higher incidence of difficult intubation. Preoperative Mallampati scores of 3 and 4 can help predict difficult laryngoscopy, but may miss some cases.
Area of Science:
- Anesthesiology
- Endocrinology
- Neurosurgery
Background:
- Previous studies suggest acromegalic patients experience more difficult intubations.
- Retrospective studies lacked preoperative airway assessments.
- This study aimed to determine difficult intubation incidence and predictive value of preoperative tests.
Purpose of the Study:
- Determine the incidence of difficult intubation in acromegalic patients.
- Evaluate the usefulness of preoperative airway assessments in predicting difficult laryngoscopy.
- Identify predictors for difficult laryngoscopy in this patient population.
Main Methods:
- 128 acromegalic patients undergoing general anesthesia and tracheal intubation were studied.
- Preoperative assessments included Mallampati classification, thyromental distance, and head/neck mobility.
- Laryngoscopic view (Cormack and Lehane grade) was assessed post-induction; grades III-IV indicated difficult laryngoscopy.
Main Results:
- Difficult laryngoscopy (grade III) occurred in 26% of patients.
- External laryngeal pressure improved visualization in 65% of difficult cases.
- Mallampati classes 3 and 4 were significantly associated with difficult laryngoscopy (P=0.001).
Conclusions:
- The incidence of difficult laryngoscopy and intubation is elevated in acromegalic patients.
- Preoperative Mallampati scores of 3 and 4 are valuable predictors of difficult laryngoscopy.
- Despite predictive value, Mallampati scores may not identify all patients with difficult airways.