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Related Concept Videos

Criteria for Causality: Bradford Hill Criteria - II01:28

Criteria for Causality: Bradford Hill Criteria - II

The Bradford Hill criteria serve as guidelines for establishing causative links in epidemiological research. Beyond Strength, Consistency, Specificity, and Temporality, key criteria also include Biological Gradient, Plausibility, Coherence, Experiment, and Analogy. These principles assist scientists in assessing the likelihood of causation in complex biological contexts. Below is a summary of these concepts:
Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
Causality in Epidemiology01:21

Causality in Epidemiology

Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Pathophysiology of Vomiting01:22

Pathophysiology of Vomiting

Vomiting is a complex physiological response to expel harmful or irritating substances from the body. It's a defensive mechanism triggered by stimuli like poisons, microbial toxins, cytotoxic drugs, and mechanical abdominal distension. The process is centrally coordinated by the vomiting (or emetic) center located in the medulla of the brainstem. This area, rich in muscarinic M1, histamine H1, neurokinin 1 (NK1), and serotonin 5-HT3 receptors, coordinates the act of vomiting through interaction...

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Related Experiment Video

Updated: May 12, 2026

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
10:39

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

Published on: June 2, 2014

Causality and headache triggers.

Dana P Turner1, Todd A Smitherman, Vincent T Martin

  • 1Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA. daturner@wakehealth.edu

Headache
|March 29, 2013
PubMed
Summary
This summary is machine-generated.

Establishing headache trigger causality requires specific conditions, including consistent sufferer, trigger effect, and presentation. Natural experimentation is unreliable; formal studies are recommended for accurate headache trigger analysis.

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Last Updated: May 12, 2026

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
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Published on: June 2, 2014

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Area of Science:

  • Neurology
  • Epidemiology
  • Causal Inference

Background:

  • The term "headache trigger" is widely used but lacks clear criteria for establishing causality.
  • The specific assumptions for a causal relationship between stimuli and headaches remain underexplored.

Purpose of the Study:

  • To explore the necessary conditions for assigning causal status to headache triggers.
  • To apply Rubin's Causal Model to understand headache causation.

Main Methods:

  • Synthesis and application of Rubin's Causal Model to headache triggers.
  • Outlining conditions for inferring causality between a trigger event and a headache.

Main Results:

  • Identified three core assumptions for headache trigger causality: constancy of the sufferer, constancy of the trigger effect, and constancy of trigger presentation.
  • These assumptions must be met for valid evaluation of potential headache triggers in any study.

Conclusions:

  • Satisfying these assumptions is challenging in clinical practice and natural experiments.
  • Formal experimental designs or advanced statistical modeling (e.g., diary studies) are superior for establishing headache trigger causality.