Removal of Laryngeal Mask Airway: Awake or Deep Anesthesia?
Abstract
Background: The aim of this study was to study the influence of depth of anesthesia (awake or deep anesthesia) and choice
of anesthetic drug (halothane or propofol) on the incidence and severity of airway hyperreactivity associated with Laryngeal
Mask Airway (LMA) removal.
Methods: A prospective, randomized, double blind study was done in 156 ASA physical status I and II patients, aged 18-65
years, who had under gone short time elective surgery (<1 hour). Patients were randomly assigned in one of the four
subgroups: Hal-Aw (anesthesia maintenance with halothane and LMA removal in awaked state), Hal-Deep (anesthesia maintenance
with halothane and LMA removal in deep anesthesia), Pro-Aw (anesthesia maintenance with propofol and LMA
removal in awaked state), and Pro-Deep (anesthesia maintenance with propofol and LMA removal in deep anesthesia). The
incidence of cough and straining, bronchospasm, laryngospasm, breathholding, vomiting, oxygen desaturation, and severity
of airway hyperreactivity (mild, moderate, severe) with LMA removal were evaluated.
Results: There were no significant differences in bronchospasm, larynchospasm, oxygen desaturation among four
subgroups. Significant differences were in cough and straining, breath holding, vomiting, and finally severity of airway
hyperreactivity among four subgroups. Depth of anesthesia didn’t have any effect on incidence and severity of airway hyperreactivity
but in those with propofol, they were lower than those with halothane.
Conclusion: In short time surgery and with use of LMA, anesthesia with propofol is associated with lower incidence and
severity of airway hyperreactivity than halothane.
Keywords: propofol, halothane, airway hyperreactivity, Laryngeal Mask Airway (LMA).
of anesthetic drug (halothane or propofol) on the incidence and severity of airway hyperreactivity associated with Laryngeal
Mask Airway (LMA) removal.
Methods: A prospective, randomized, double blind study was done in 156 ASA physical status I and II patients, aged 18-65
years, who had under gone short time elective surgery (<1 hour). Patients were randomly assigned in one of the four
subgroups: Hal-Aw (anesthesia maintenance with halothane and LMA removal in awaked state), Hal-Deep (anesthesia maintenance
with halothane and LMA removal in deep anesthesia), Pro-Aw (anesthesia maintenance with propofol and LMA
removal in awaked state), and Pro-Deep (anesthesia maintenance with propofol and LMA removal in deep anesthesia). The
incidence of cough and straining, bronchospasm, laryngospasm, breathholding, vomiting, oxygen desaturation, and severity
of airway hyperreactivity (mild, moderate, severe) with LMA removal were evaluated.
Results: There were no significant differences in bronchospasm, larynchospasm, oxygen desaturation among four
subgroups. Significant differences were in cough and straining, breath holding, vomiting, and finally severity of airway
hyperreactivity among four subgroups. Depth of anesthesia didn’t have any effect on incidence and severity of airway hyperreactivity
but in those with propofol, they were lower than those with halothane.
Conclusion: In short time surgery and with use of LMA, anesthesia with propofol is associated with lower incidence and
severity of airway hyperreactivity than halothane.
Keywords: propofol, halothane, airway hyperreactivity, Laryngeal Mask Airway (LMA).