Can Habitus Adapted Length Based Body Weight Estimation be Improved by Adding Further Parameters?

Study Overview
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Brief Summary
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The purpose of this prospective single center study is to investigate if the accuracy of length based body weight estimation by the already investigated algorithm (CLAWAR) can be improved by adding another parameter. For this study 500 patients are required to collect anonymized data (length, weight, age, mid upperarm circumference and patient habitus by visual estimation) for achieving a power of 80% during statistical analysis. The main hypothesis ist that CLAWAR's accuracy can be improved.

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 CLAWAR. 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 the accuracy of length based weight estimation using either patient habitus by visual estimation or an improved version of the algorithm CLAWAR using the mid upperarm circumference.

Official Title
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Evaluation of an Algorithm for Gender Specific and Habitus Adapted Length Based Body Weight Estimation in Children - Improvement by Adding Another Parameter?

Conditions
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Weight-Estimation

Intervention / Treatment
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* Other: Accuracy of weight estimation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: body length suitable with the investigated algorithm all patients aged 0 -16 years 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

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Accuracy of weight estimation<br>Computer based comparison of the two algorithms based on collected patient data | Other: Accuracy of weight estimation<br>* Computer based comparison<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| length-based weight-estimation by algorithm | Habitus adapted weight estimation based on visual habitus classification compared to weight estimation by the modified algorithm CLAWAR utilizing mid upperarm circumference | during procedure | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Anaesthesia, Anthropometry, Body weight and measures, Development, Emergency treatment, Patient safety