Abstract：
STUDY OBJECTIVE:To compare the work of breathing associated with the laryngeal mask airway (LMA) and tracheal tube (TT) in spontaneously breathing anesthetized patients. DESIGN:Randomized, prospective, controlled trial. SETTING:University teaching hospital. SUBJECTS:20 ASA physical status I and II patients scheduled for elective peripheral surgery with general anesthesia. INTERVENTIONS AND MEASUREMENTS:A standardized anesthetic protocol was utilized, and patients were allowed to breathe spontaneously through a circle absorption system. Patients were randomly assigned to receive either LMA (n = 10) or TT (n = 10) for airway management. Work of breathing was determined after the patients' ventilatory status had been allowed to stabilize for 15 minutes and before the onset of the surgical stimulus. Airflow and esophageal pressures were measured using a pneumotachograph and an esophageal balloon, respectively, and the values were subsequently integrated to determine work of breathing. MAIN RESULTS:The two groups were similar with respect to demographic characteristics and the end-tidal concentrations of carbon dioxide and isoflurane. Work of breathing per minute through the LMA (1.4+/-0.3 J/min) was significantly lower than that through the TT (1.9+/-0.4 J/min). CONCLUSION:In healthy, anesthetized, spontaneously breathing patients, work of breathing is significantly lower through the LMA than the TT.
journal_name
J Clin Anesthjournal_title
Journal of clinical anesthesiaauthors
Joshi GP,Morrison SG,White PF,Miciotto CJ,Hsia CCdoi
10.1016/s0952-8180(98)00026-9subject
Has Abstractpub_date
1998-06-01 00:00:00pages
268-71issue
4eissn
0952-8180issn
1873-4529pii
S0952-8180(98)00026-9journal_volume
10pub_type
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