Defining rules for the identification of critical ventilatory events.
OBJECTIVE
The automated recognition of critical clinical events by physiological monitors is a challenging task exacerbated by a lack of standardized and clinically relevant threshold criteria. The objective of this investigation was to develop consensus for such criteria regarding the identification of three ventilatory events: disconnection or significant leak in the anesthesia circuit, decreased lung compliance or increased resistance, and anesthetic overdose from inhaled anesthetics.


METHODS
We individually administered a structured interview to five expert anesthesiologists to gain insight into the cognitive processes used by clinicians to diagnose ventilatory events and to determine the common heuristics (rules of thumb) used in clinical practice. We then used common themes, identified from analysis of the structured interviews, to generate questions for a series of web-based questionnaires. Using a modified Delphi technique, iterative questionnaire administration facilitated rapid consensus development on the thresholds for the specific rules used to identify ventilatory events.


RESULTS
A threshold for 75% agreement was described for each scenario in a healthy ventilated adult. A disconnection or significant leak in the anesthesia circuit is diagnosed with peak airway pressure (< 5 cm H2O or change of 15 cm H2O), ETCO2 (0 mmHg, 40% drop, or value below 10 mmHg for a duration of 20 sec), and inspired-expired volume difference (300 mL). Increased resistance or decreased lung compliance is diagnosed with high peak airway pressure (40 cm H2O or a 20 cm H2O change), asymmetry of capnogram, and changes in measured compliance or resistance. Anesthetic overdose from inhaled anesthetics is diagnosed with high end-tidal anesthetic agent concentration (2 MAC in a patient less than 60 yr of age or 1.75 MAC in a patient over 60 yr of age), low systolic blood pressure (below 60 mmHg), and low modified electroencephalogram (bispectral index or entropy).


CONCLUSIONS
This investigation has provided a set of consensus-based criteria for developing rules for the identification of three critical ventilatory events and has presented insight into the decision heuristics used by clinicians.
Department of Anesthesiology, Pharmacology and Therapeutics, The University of British Columbia, Vancouver, British Columbia, Canada. anserminos@yahoo.ca
J Mark
JM
Ansermino
Maryam
M
Dosani
Erica
E
Amari
Peter T
PT
Choi
Stephan K W
SK
Schwarz
D000758:Anesthesia / Q000009:adverse effects*; D000769:Anesthesia, Inhalation / Q000009:adverse effects; D000776:Anesthesiology; D018685:Anesthetics, Inhalation / Q000506:poisoning*; D001794:Blood Pressure; D003422:Critical Care; D062787:Drug Overdose / Q000175:diagnosis; D004569:Electroencephalography; D004868:Equipment Failure; D006801:Humans; D007407:Interviews as Topic; D008170:Lung Compliance; D008171:Lung Diseases / Q000209:etiology*; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D017410:Practice Guidelines as Topic; D012143:Respiratory Physiological Phenomena / Q000187:drug effects*; D011795:Surveys and Questionnaires
D018685:Anesthetics, Inhalation