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Related Concept Videos

Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...

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Related Experiment Video

Updated: Jul 6, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
10:34

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Subarachnoid Haemorrhage Incidence Pattern Analysis with Circular Statistics.

Ashish Dravid1, Wen-Shan Sung2, Jeeuk Song2

  • 1Department of Neurosurgery, Nepean Hospital, The University of Sydney, Sydney, Australia.

Emergency Medicine International
|April 24, 2024
PubMed
Summary

This study found no evidence that aneurysmal subarachnoid haemorrhage (SAH) incidence follows specific daily, weekly, or seasonal patterns. SAH occurrence is not linked to the lunar cycle, equinoxes, or solstices.

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Last Updated: Jul 6, 2026

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Public Health

Background:

  • Aneurysmal subarachnoid haemorrhage (SAH) is a critical condition with significant morbidity and mortality.
  • Understanding disease rhythms can optimize healthcare resource allocation and inform pathophysiology.
  • Previous research suggests potential periodic patterns in SAH incidence, but findings are inconsistent regarding chronobiological factors.

Purpose of the Study:

  • To investigate infradian rhythms in aneurysmal subarachnoid haemorrhage (SAH) occurrence.
  • To determine if SAH incidence exhibits a circular temporal pattern.
  • To correlate SAH occurrence with known temporal patterns like weekdays, lunar cycles, equinoxes, and solstices.

Main Methods:

  • Utilized circular statistical methods for novel temporal pattern analysis of SAH.
  • Analyzed SAH occurrence data for cyclical patterns within periods up to 365 days.
  • Examined potential relationships between SAH incidence and specific temporal markers.

Main Results:

  • The study found no statistically significant evidence supporting specific cyclical patterns in SAH occurrence.
  • No association was detected between SAH incidence and specific weekdays, full moon phases, equinoxes, or solstices.
  • The analysis did not reveal any relationship between SAH incidence and the timing of events within a 365-day cycle.

Conclusions:

  • The findings do not support the hypothesis that aneurysmal subarachnoid haemorrhage (SAH) incidence is influenced by infradian rhythms or specific temporal cycles.
  • Current data suggest no link between SAH occurrence and chronobiological factors like lunar cycles or seasonal events.
  • Further research with larger populations and advanced circular statistical methods is recommended to explore potential subtle temporal patterns in SAH.