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Critical Region, Critical Values and Significance Level01:16

Critical Region, Critical Values and Significance Level

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The critical region, critical value, and significance level are interdependent concepts crucial in hypothesis testing.
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A critical value is a definite value obtained from a particular probability distribution at a predecided confidence level (or a predecided significance level) for a given population parameter. The critical value provides demarcation that separates the sample statistics that are likely to occur from the ones that are unlikely to occur based on the given probability distribution and the population parameter to be estimated. The critical value for normal distribution is obtained from the z...
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Related Experiment Video

Updated: Jan 23, 2026

Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Videolaryngoscopy in critically ill patients.

Samir Jaber1,2, Audrey De Jong1,2, Paolo Pelosi3,4

  • 1PhyMedExp, University of Montpellier, INSERM U1046, CNRS UMR 9214, Montpellier, France.

Critical Care (London, England)
|June 19, 2019
PubMed
Summary

Videolaryngoscopy can improve glottis visualization during intensive care unit (ICU) intubations. While not universally recommended for all ICU intubations, it is a valuable rescue tool for difficult procedures, especially by experienced clinicians.

Keywords:
Critically illDirect laryngoscopyEmergency departmentIntensive care unitTracheal intubationVideolaryngoscopy

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Area of Science:

  • Critical Care Medicine
  • Medical Devices
  • Airway Management

Background:

  • Intubation is common in ICUs but carries risks, particularly during emergencies or with severe organ failure.
  • Improving intubation success and safety is a key objective for ICU physicians.
  • Videolaryngoscopy offers potential benefits for airway management.

Purpose of the Study:

  • To evaluate the role and effectiveness of videolaryngoscopy in intensive care unit (ICU) intubations.
  • To assess the benefits and limitations of different videolaryngoscope types.
  • To determine optimal strategies for videolaryngoscopy use in critical care settings.

Main Methods:

  • Review of randomized controlled trials (RCTs) and existing literature on videolaryngoscopy in the ICU.
  • Comparison of different videolaryngoscope designs (e.g., Macintosh-shaped, anatomical blades).
  • Analysis of factors influencing intubation success, such as glottis view and patient positioning.

Main Results:

  • Videolaryngoscopy generally improves glottis view and allows expert supervision.
  • Systematic use in all ICU intubations is not yet recommended, especially for non-expert users.
  • Videolaryngoscopes are effective as rescue devices for difficult or failed intubations, particularly in expert hands.

Conclusions:

  • Videolaryngoscopy is a valuable tool in the ICU for managing difficult airways.
  • Further research is needed to optimize its use with adjuncts and patient positioning.
  • Availability of videolaryngoscopes in ICUs is crucial for managing challenging intubations.