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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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Related Experiment Video

Updated: Oct 6, 2025

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
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3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache

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Cluster Headache: Rapid Evidence Review.

Omojo Odihi Malu1, Jonathan Bailey1, Matthew Kendall Hawks2

  • 1DiLorenzo TRICARE Health Clinic, Pentagon, Washington, DC, USA.

American Family Physician
|January 14, 2022
PubMed
Summary
This summary is machine-generated.

Cluster headache, a severe primary headache disorder, causes intense unilateral pain and autonomic symptoms. Treatments range from abortive therapies like oxygen to prophylactic options such as verapamil and newer agents like galcanezumab.

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Area of Science:

  • Neurology
  • Headache Medicine

Background:

  • Cluster headache is the most common trigeminal autonomic cephalgia, affecting less than 1% of the population.
  • It typically begins around age 30 and is more prevalent in males.
  • Characterized by severe unilateral orbital, supraorbital, or temporal pain attacks.

Purpose of the Study:

  • To provide a comprehensive overview of cluster headache.
  • To detail its clinical presentation, triggers, and management strategies.

Main Methods:

  • Review of existing literature on cluster headache.
  • Classification of treatments into abortive, transitional, and prophylactic categories.

Main Results:

  • Attacks occur 1-8 times daily, lasting 15-180 minutes, with associated autonomic symptoms (e.g., lacrimation, rhinorrhea, ptosis).
  • Common triggers include alcohol, nitrates, and strong odors.
  • Established treatments include triptans, oxygen, steroids, verapamil, lithium, melatonin, and topiramate.

Conclusions:

  • Cluster headache management involves a multi-faceted approach.
  • Emerging treatments like galcanezumab and neurostimulation offer new therapeutic avenues.