An observational study in Difficult Videolaryngoscopy, sponsored by Clinica Universidad de Navarra, Universidad de Navarra. Recruiting at 1 site in Spain. Open to participants aged 18 Years to 90 Years. Per ClinicalTrials.gov, last updated 2026-04-15.
Sponsored by Clinica Universidad de Navarra, Universidad de Navarra · Observational
This multicentre observational study will collect clinical parameters, demographic data, and point-of-care airway ultrasound measurements from adult patients undergoing videolaryngoscopy across participating centres. The collected data will be analysed using artificial intelligence-based analytical approaches, including statistical and machine-learning techniques, to examine their association with predefined videolaryngoscopy-related outcomes.
Videolaryngoscopy is widely used for tracheal intubation in anaesthesia and critical care; however, variability in patient anatomy, operator experience, and institutional practice may influence videolaryngoscopy performance and strategy selection. Conventional bedside airway assessments provide limited guidance for videolaryngoscopy-specific decision-making, particularly in diverse clinical environments.
This multicentre observational study will collect clinical parameters, demographic data, and point-of-care airway ultrasound measurements from adult patients undergoing videolaryngoscopy across participating centres. The collected data will be analysed using artificial intelligence-based analytical approaches, including statistical and machine-learning techniques, to examine their association with predefined videolaryngoscopy-related outcomes.
The primary objective is to evaluate the performance and generalisability of multimodal predictive models developed using multicentre data. The study is designed to support the development and validation of data-driven decision-support tools for videolaryngoscopy planning. These tools are intended for research purposes and do not replace clinical judgement.
Clinica Universidad de Navarra, Universidad de Navarra is the lead sponsor of 160 studies on the registry; 36 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Patients (male or female) ASA I-III, aged between 18 and 90 years, undergoing scheduled surgery requiring orotracheal intubation. The signature of the informed consent is required authorizing its inclusion in the study.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Patient undergoing general anesthesia with intubation We will explore clinical airway parameters and external ultrasound parameters of the airway.
Diagnostic Test: Ultrasound mesurements
Compare various clinical test with ultrasound parameters to predict difficult videolaryngoscopy intubation.
Distance from skin to Hyoid bone measured with lineal ultrasound probe
Distance from skin to Hyoid bone measured with lineal ultrasound probe
Time frame: Immediately prior to induction of anesthesia
Distance from skin to epiglottis measured with lineal ultrasound probe
Distance from skin to epiglottis measured with lineal ultrasound probe
Time frame: Immediately prior to induction of anesthesia
Tongue Thickness measured with convex probe
Tongue Thickness measured with convex probe
Time frame: Immediately prior to induction of anesthesia
Distance from Jaw to Hyoid bone distance measured with convex probe
Distance from Jaw to Hyoid bone distance measured with convex probe
Time frame: Immediately prior to induction of anesthesia
Modified Mallampati Score Class I: Soft palate, uvula, fauces, pillars visible. Class II: Soft palate, major part of uvula, fauces visible. Class III: Soft palate, base of uvula visible. Class IV: Only hard palate visible.
Modified Mallampati Score
Time frame: Immediately prior to induction of anesthesia
Thyromental distance measured from the thyroid notch to the tip of the jaw with the head extended
Thyromental distance
Time frame: Immediately prior to induction of anesthesia
Sternomental distance the distance from the suprasternal notch to the mentum and is measured with the head fully extended on the neck and the mouth closed
Sternomental distance
Time frame: Immediately prior to induction of anesthesia
Interincisor distance DIstance in centimeters between fornt incisors
Interincisor distance
Time frame: Immediately prior to induction of anesthesia
Upper Lip Bite Test upper lip bite criteria-class I = lower incisors can bite the upper lip above the vermilion line, class II = lower incisors can bite the upper lip below the vermilion line, and class III = lower incisors cannot bite the upper lip
Upper Lip Bite Test
Time frame: Immediately prior to induction of anesthesia
neck circumference Using a flexible measuring tape in centimeters, neck circumference at the level of thethyroid cartilage will be measured
neck circumference Using a flexible measuring tape in centimeters, neck circumference at the level of thethyroid cartilage will be measured
Time frame: Immediately prior to induction of anesthesia
Plan to share: Undecided
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