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Factitious halothane detection during trigger-free anesthesia in a malignant hyperthermia susceptible patient

Abstract

Purpose

To discuss the problems encountered when halothane was detected in a presumed ‘clean’ patient circuit during the ‘trigger-free’ anesthetic management of a known Malignant Hyperthermia Susceptible (MHS) patient for routine orthopedic surgery.

Clinical Features

A 29-yr-old MHS woman had a wrist arthroscopy/explorationAusion under general anesthesia. During the course of the ‘trigger-free’ anesthetic the respiratory gas analyser detected end-tidal halothane in the patient circuit. The patient was disconnected from the circuit as attempts to identify the source of the readings were undertaken. After ruling out the presence of halothane by various clinical manoeuvres the patient was reconnected to the circuit without sequelae.

Conclusion

By exclusion the problem was presumed to be a factitious reading resulting from the respiratory gas analyser incorrectly identifying patient-expired methane as halothane.

Résumé

Objectif

Faire le point sur les problèmes survenus lorsque de l’halothane a été détecté dans un circuit présumé «propre» pendant l’anesthésie, sans «agent déclenchant», d’une patiente susceptible d’hyperthermie maligne (SHM) au cours d’une intervention orthopédique de routine.

Éléments cliniques

Une femme de 29 ans SHM s’est présentée pour l’arthroscopie /exploration /fusion d’un poignet sous anesthésie générale. Pendant l’anesthésie sans «facteur déclenchant» d’hyperthermie, l’analyseur de gaz respiratoires a détecté la présence d’halothane dans le cirucuit en fin d’expiration. Le circuit a été débranché et on a tenté de vérifier la présence d’halothane. Mais cette possibilité a été exclue à la suite de diverses manoeuvres cliniques et on a rebranché le circuit, ce qui n’a laissé aucune séquelle à la patiente.

Conclusion

On a déduit que le problème provenait d’une fausse indication de l’analyseur de gaz respiratoires qui aurait incorrectement identifié le méthane expiré comme de l’halothane.

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Correspondence to Christopher A. Hawkes.

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Hawkes, C.A. Factitious halothane detection during trigger-free anesthesia in a malignant hyperthermia susceptible patient. Can J Anesth 46, 567 (1999). https://doi.org/10.1007/BF03013548

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  • DOI: https://doi.org/10.1007/BF03013548

Keywords

  • Halothane
  • Laryngeal Mask Airway
  • Fenoterol
  • Anesthesia Machine
  • Artificial Lung