Luck, an Inquisitive Mind, and Opportunities: Lessons Learned: A Blinded Study of Pulse Oximetry before It Became a
1Department of Anesthesia, Critical Care and Pain Medicine, Harvard Medical School at the Massachusetts General Hospital for Children, Boston, Massachusetts.
Insights
Pulse oximetry monitoring in pediatric surgery significantly reduced major hypoxic events by providing early warnings before symptoms appeared. This technology improved patient safety, especially for younger children and those with higher ASA physical status.
Area of Science:
- Anesthesiology
- Pediatric Surgery
- Critical Care Medicine
Background:
- Intraoperative hypoxemia is a risk in pediatric anesthesia.
- Traditional vital signs may not always provide early detection of hypoxemia.
- Pulse oximetry offers continuous oxygen saturation monitoring.
Purpose of the Study:
- To evaluate the impact of pulse oximetry availability on intraoperative hypoxic events in pediatric surgical patients.
- To determine if pulse oximetry provides earlier detection of hypoxemia compared to traditional clinical signs.
Main Methods:
- A single-blind study involving 152 pediatric surgical patients divided into two groups: pulse oximetry data available vs. unavailable to the anesthesia team.
- A trained observer recorded hypoxic episodes and major events (SpO2 ≤ 85% for ≥ 30s).
- Comparison of event rates between groups, with subgroup analysis by age and ASA physical status.
Main Results:
- Fewer major hypoxic events occurred when pulse oximetry data was available (11 vs. 24, P=0.021).
- Pulse oximetry diagnosed hypoxemia earlier than clinical signs in more instances in the unavailable group (13 vs. 5).
- Younger children (≤ 2 years) and ASA Physical Status III/IV patients experienced more major events.
Conclusions:
- Pulse oximetry serves as an effective early warning system for developing hypoxemia in anesthetized children.
- Availability of pulse oximetry data is associated with a reduction in significant intraoperative hypoxic events.
- The technology aids in timely diagnosis of hypoxemia, potentially improving patient outcomes.
Abstract:
A Single-blind Study of Pulse Oximetry in Children. By CJ Coté, EA Goldstein, MA Cote, DC Hoaglin, and JF Ryan. Anesthesiology 1988; 68:184-8. Reprinted with permission. Oxygen saturation determined by pulse oximetry was monitored in 152 pediatric surgical patients divided into two groups. In one group, the oximeter data and alarms were available (N = 76) to the anesthesia team, and, in the other group, these data were unavailable (N = 76). A trained observer recorded all intraoperative hypoxic episodes and informed the anesthesia team of all major events (i.e., oxygen saturation 85% or less for 30 s or more; Pao2, approximately 52 mmHg). Thirty-five major events occurred: 24 in the unavailable group, and 11 in the available group (P = 0.021). A greater number of major events occurred in children 2 yr or younger (P = 0.013). Hypoxic events diagnosed by the oximeter, but not by the anesthesiologist, were more frequent in the unavailable group (13) than in the available group (5; P = 0.0495). American Society of Anesthesiologists (Schaumburg, Illinois) Physical Status III and IV patients were more likely to suffer a major event (P = 0.009 available, 0.006 unavailable). The pulse oximeter diagnosed hypoxemia before the signs and symptoms of hypoxemia were apparent (i.e., before observed cyanosis or bradycardia). Major hypoxic events were unrelated to duration of anesthesia. Major events were evenly distributed among induction, maintenance, and awakening from anesthesia; a greater number of hypoxic events occurred during induction in the unavailable group (P = 0.031). No morbidity was documented in any patient who suffered a hypoxic event. More patients experienced borderline oxygenation in room air at the end of anesthesia (90% saturation or less) in the unavailable group (12 of 60) than in the available group (3 of 57; P = 0.009). The authors conclude that pulse oximetry, in contrast to changes in vital signs, does provide an early warning of developing hypoxemia in anesthetized children.
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