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Related Concept Videos

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In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
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Updated: Feb 17, 2026

Point-of-Care Ultrasound: A Review of Ultrasound Parameters for Predicting Difficult Airways
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Correlation Between External Body Parameters and Nares-to-Vocal Cord Distance.

Mohit Jain1, Pavan Nayar2

  • 1Department of Anesthesia, Maharishi Markandeshwar Medical College and Hospital, Solan, IND.

Cureus
|February 16, 2026
PubMed
Summary
This summary is machine-generated.

Nares-to-vocal cord distance (NVD) can be estimated using external body measurements like OC7, sternomental distance (SMD), height, and weight. These findings aid in nasotracheal intubation and device placement when fiberoptic assessment is unavailable.

Keywords:
blind intubationexternal body parametersfibre optic intubationnares-to-vocal cord distancenasopharyngeal airwaysnasotracheal intubation

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Area of Science:

  • Anesthesiology
  • Anatomy
  • Medical Imaging

Background:

  • Nares-to-vocal cord distance (NVD) is crucial for safe nasotracheal intubation and nasopharyngeal device placement.
  • Accurate NVD assessment is vital for patient safety during airway management.

Purpose of the Study:

  • To evaluate the relationship between NVD and easily obtainable external body measurements in adult surgical patients.
  • To identify simple anthropometric predictors for estimating NVD.

Main Methods:

  • Prospective observational study involving adult surgical patients under general anesthesia.
  • NVD measured using fiberoptic bronchoscopy.
  • Correlations assessed between NVD and various external anthropometric parameters (height, weight, OC7, SMD, etc.).

Main Results:

  • NVD and external measurements were greater in men than women.
  • Strongest positive correlations with NVD were found with OC7, sternomental distance (SMD), height (Ht), and weight (Wt) in the overall cohort and men.
  • Significant correlations were also observed in women, though generally weaker than in men.

Conclusions:

  • Clinically relevant associations exist between NVD and simple bedside anthropometric measures (OC7, SMD, Ht, Wt).
  • These external measurements can assist clinicians in estimating NVD for airway management, particularly when advanced tools are unavailable.
  • Further research in diverse populations is needed to develop practical NVD prediction tools.