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Programming pressure support ventilation in pediatric patients in ambulatory surgery with a laryngeal mask airway.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences. (Hedenstierna)
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2007 (English)In: Anesthesia and Analgesia, ISSN 0003-2999, E-ISSN 1526-7598, Vol. 105, no 6, 1585-1591 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Anesthesia workstations with pressure support ventilation (PSV) are available, but there are few studies published on how to program flow-triggered PSV using a laryngeal mask airway (LMA) under general anesthesia in pediatric patients.

METHODS: We studied 60 ASA I and II patients, from 2 mo to 14 yr, scheduled for ambulatory surgery under combined general and regional anesthesia with a LMA. Patients were classified according to their body weight as follows: Group A ≤10 kg, Group B 11–20 kg, and Group C >20 kg. All were ventilated in PSV using the following settings: positive end-expiratory pressure of 4 cm H2O, the minimum flow-trigger without provoking auto-triggering, and the minimum level of pressure support to obtain 10 mL/kg of tidal volume.

RESULTS: The flow-trigger most frequently used in our study was 0.4 L/min, ranging from 0.2 to 0.6 L/min. We found no correlation between the flow-trigger setting and the patient’s age, weight, compliance, resistance, or respiratory rate. There was a good correlation between the level of pressure support (Group A = 15 cm H2O, Group B = 10 cm H2O and Group C = 9 cm H2O) and age (P < 0.001), weight (P < 0.001), dynamic compliance (P < 0.001), and airway resistances (P < 0.001).

CONCLUSIONS: PSV with a Proseal™ LMA in outpatient pediatric anesthesia can be programmed simply using the common clinical noninvasive variables studied. However, more studies are needed to estimate the level of pressure support that may be required in other clinical situations (respiratory pathology, endotracheal tubes, or other types of surgeries) or with other anesthesia workstations.

IMPLICATIONS: This study evaluates the ability to administer positive pressure support ventilation through a laryngeal mask airway to anesthetized, spontaneously breathing children.

Place, publisher, year, edition, pages
2007. Vol. 105, no 6, 1585-1591 p.
Keyword [en]
Adolescent, Ambulatory Surgical Procedures/instrumentation/*methods/standards, Child, Child; Preschool, Female, Humans, Infant, Infant; Newborn, Laryngeal Masks/standards, Male, Positive-Pressure Respiration/instrumentation/*methods/standards
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-15683DOI: 10.1213/01.ane.0000287674.64086.f1PubMedID: 18042854OAI: oai:DiVA.org:uu-15683DiVA: diva2:43454
Available from: 2008-03-03 Created: 2008-03-03 Last updated: 2010-04-01Bibliographically approved

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