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Related Concept Videos

Hazard Ratio01:12

Hazard Ratio

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
For example, in a clinical trial...
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RACE - Rapid Amplification of cDNA Ends02:35

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Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific...
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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Introduction to Epidemiology01:26

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Epidemiology, known as the cornerstone of public health, involves studying the distribution and determinants of health-related events in defined populations and applying these insights to control health issues. This is essential for understanding how diseases spread, identifying populations at greater risk, and implementing measures to control or prevent outbreaks. Epidemiology addresses not only infectious diseases but also non-communicable conditions like cancer and cardiovascular disease,...
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Related Experiment Video

Updated: Mar 18, 2026

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Croup: Rapid Evidence Review.

Alexandria Cooke1, Sara Conway2, Leslie Griffin3

  • 1Erlanger Health, Chattanooga, Tennessee, and University of Tennessee Health Science Center (UTHSC) College of Medicine, Chattanooga.

American Family Physician
|March 16, 2026
PubMed
Summary
This summary is machine-generated.

Croup, a common childhood respiratory illness, causes barking cough and stridor due to upper airway inflammation. Corticosteroids like dexamethasone are the primary treatment, with nebulized epinephrine for severe cases.

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Area of Science:

  • Pediatrics
  • Pulmonology
  • Emergency Medicine

Background:

  • Croup is a frequent pediatric respiratory condition characterized by subglottic inflammation.
  • Symptoms include barking cough, hoarseness, and inspiratory stridor, often accompanied by fever.
  • Differential diagnosis must exclude severe upper airway obstructions like epiglottitis or abscesses.

Purpose of the Study:

  • To outline the diagnosis and management of croup in children.
  • To emphasize the importance of differentiating croup from more critical conditions.
  • To review current treatment guidelines for croup.

Main Methods:

  • Clinical assessment for characteristic symptoms of croup.
  • Consideration of differential diagnoses for upper airway obstruction.
  • Review of treatment protocols including corticosteroids and nebulized epinephrine.

Main Results:

  • Corticosteroids, particularly dexamethasone, are effective first-line treatments.
  • Nebulized epinephrine is indicated for moderate to severe croup.
  • Radiography and lab tests are generally not required unless the diagnosis is uncertain.

Conclusions:

  • Prompt recognition and appropriate management of croup are essential.
  • Corticosteroids reduce symptom severity and healthcare utilization.
  • Recurrent croup warrants investigation for underlying abnormalities.