Evaluation of an Algorithm for Length Based Weight Estimation in Comparison to Known Devices

Study Overview
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Brief Summary
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The purpose of this prospective single center study is to investigate if a developed algorithm is more accurate than the Broselow Tape (BT). For this study 500 patients are required to collect anonymized data (length, weight, age, anaesthesia material used during anaesthesia) for achieving a power of 80% during statistical analysis. The main hypothesis ist that the algorithm has a better accuracy than the BT.

Detailed Description
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This prospective single center study is performed at the university children's hospital zurich. Patients planned for surgery in general anaesthesia with intubation, aged 0 to 16 years and with a body length suitable for the emergency tapes can be included in this study. Patient and parental information is performed during the pre-anaesthetic visit. After written consent the patient will be included. Patient ́s length and weight will be measures earliest one day before data collection. Data collection during anaesthesia has no influence on the daily anaesthesia routine and has no impact on patient safety and anaesthesia. Patient's data is made anonymous for further inspection. Data is documented in Microsoft Excel and statistical analysis calculated with SPSS. 500 patients are needed for a power of 80%. Primary outcome parameter is length- based weight estimation, secondary outcome parameters are length-based age estimation and the correctness of recommended anaesthesia material (endotracheal tube, laryngeal mask, oropharyngeal mask and face mask). Both tools (algorithm and BT) will be compared with each other regarding primary and secondary outcome parameters.

Official Title
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Evaluation of an Algorithm for Length Based Weight Estimation in Comparison to Already Known Devices Like the Broselow Tape (BT)

Conditions
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Weight-Estimation

Intervention / Treatment
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* Device: Accuracy of an algorithm and the Broselow Tape


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: body length suitable with the investigated emergency tapes all patients aged 0 -16 years receiving general anaesthesia with intubation or laryngeal mask Exclusion Criteria: Already included in this study once missing patient or parental consent

Ages Eligible for Study
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Minimum Age: 1 Day
Maximum Age: 16 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Device: Accuracy of an algorithm and the Broselow Tape|Computer based comparison of the two devices based on collected patient data|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| length-based weight-estimation by algorithm | The by the algorithm estimated bodyweight based on the patient's Body length is investigated regarding the estimations accuracy and cases in the +/- 10% interval | during anaesthesia | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| length based age estimation | The by the algorithm estimated age based on the patient's body length is investigated regarding the estimations accuracy | during anaesthesia | 
| size of endotracheal tube | The by the algorithm suggested endotracheal tube based on the patient's Body length is investigated regarding the correctness | during anaesthesia | 
| size of laryngeal mask | The by the algorithm suggested laryngeal mask based on the patient's Body length is investigated regarding the correctness | during anaesthesia | 
| size of facemask | The by the algorithm suggested facemask based on the patient's body length is investigated regarding the correctness | during anaesthesia | 
| size of oropharyngeal tube | The by the algorithm suggested oropharyngeal tube based on the patient's Body length is investigated regarding the correctness | during anaesthesia | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Broselow Tape, Weight estimation, Patient safety