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Updated: Sep 30, 2025
Guidelines for Elective Pediatric Fiberoptic Intubation
Published on: January 17, 2011
Comparative Evaluation of Difficult Intubation Predictors in Children Under Two Years of Ages
Sedighe Shahhosseini1, Mohammad Montasery1, Mohammadali Saadati1
1Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
Insights
Predicting difficult pediatric intubation is crucial. Age under 6 months, weight under 5.9 kg, height under 61 cm, and sternomental distance under 5.3 cm are key indicators for challenging tracheal intubation in children.
Area of Science:
- Pediatric Anesthesiology
- Airway Management
- Critical Care Medicine
Background:
- Tracheal intubation is essential for securing pediatric airways.
- Managing pediatric airways presents significant challenges, particularly for non-specialists.
- Pre-anesthesia airway evaluation is vital for identifying difficult intubations and preventing adverse events in children.
Purpose of the Study:
- To compare the efficacy of adult predictors for difficult tracheal intubation in children under two years of age.
- To identify reliable pre-anesthetic indicators for predicting difficult intubation in pediatric patients.
Main Methods:
- A prospective descriptive-analytical study involving 405 children under two years undergoing elective surgery.
- Measurements included age, weight, height, sternomental distance (SMD), mouth opening (MO), neck circumference (NC), and the acromio-axillo-suprasternal notch index (AASI).
- Intubation difficulty was assessed using the Intubation Difficulty Scale (IDS) score by an expert anesthesiologist.
Main Results:
- The incidence of difficult intubation was 16% (IDS > 4) and 3% (IDS > 5).
- Age, weight, height, and SMD were significant predictors of difficult intubation.
- Identified cut-off points: age < 6 months, weight < 5.9 kg, height < 61 cm, and SMD < 5.3 cm.
Conclusions:
- Difficult pediatric intubation can be predicted using specific pre-anesthetic measurements.
- Key predictors include age < 6 months, weight < 5.9 kg, height < 61 cm, and SMD < 5.3 cm.
- These easily measurable parameters can assist anesthesiologists in anticipating and managing difficult tracheal intubations in young children.
Background:
Tracheal intubation is the most reliable way of securing an airway. Pediatric airway management is one of the significant challenges, especially for non-pediatric anesthesiologists. Early airway evaluation for detecting difficult intubation and preventing catastrophic events is necessary before anesthesia, especially in children.
Objectives:
Therefore, this study was done to compare some valuable adult predictors in children under two years of age.
Methods:
This prospective descriptive-analytical study was performed on 405 children under two years of age that were referred for elective surgery under general anesthesia with endotracheal intubation in Imam Hossein Hospital, Isfahan. Under sedation in a supine position, we measured items, including age, weight, height, stern omental distance (SMD), mouth opening (MO), neck circumference (NC), acromio-axillo-suprasternal notch index (AASI), and intubation difficulty scale score (IDS). An expert anesthesiologist did laryngoscopy and intubation, and difficult cases were recorded.
Results:
Our study showed that the frequency of difficult intubation with IDS > 4 was %16, and with IDS > 5 was %3. The variables, including age, weight, height, and SMD, significantly predicted difficult intubation. The cut-off points for age < 6 months, weight < 5/9 kg, height < 61 cm, and SMD < 5/3 cm were obtained, respectively. Other variables, such as MO, AASI, NC, and sex, were unreliable predictors for difficult intubation.
Conclusions:
We found that IDS > 4, age< 6-month, weight < 5/9 kg, and SMD < 5/3 cm are predictors for difficult intubation. It is helpful for the anesthesiologist to measure these predictions before anesthesia is started to find who has difficult intubation.
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