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Related Concept Videos

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...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
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...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...

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Related Experiment Video

Updated: May 25, 2026

Dural Stimulation and Periorbital von Frey Testing in Mice As a Preclinical Model of Headache
05:40

Dural Stimulation and Periorbital von Frey Testing in Mice As a Preclinical Model of Headache

Published on: July 29, 2021

Post-dural puncture headache.

Ahmed Ghaleb1, Arjang Khorasani, Devanand Mangar

  • 1Department of Anesthesiology, University of Arkansas for Medical Sciences, Little Rock, AR.

International Journal of General Medicine
|January 31, 2012
PubMed
Summary
This summary is machine-generated.

Post-dural puncture headache (PDPH) risk is reduced with smaller, pencil-point needles. An epidural blood patch is recommended for high-risk patients experiencing PDPH, using 12-20 mL of blood.

Keywords:
causegaugeincidenceneedlespost-dural puncture headacherisk

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Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
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Published on: June 18, 2021

Area of Science:

  • Anesthesiology
  • Neurosurgery
  • Neurology

Background:

  • Post-dural puncture headache (PDPH) remains a significant complication following dural puncture.
  • Historical context: First described by August Bier in 1898.
  • Advances in needle design and management strategies have evolved over the past 30 years.

Purpose of the Study:

  • To review current understanding and management of PDPH.
  • To highlight the impact of needle characteristics on PDPH incidence.
  • To outline evidence-based recommendations for PDPH prevention and treatment.

Main Methods:

  • Review of clinical and laboratory research over the last 30 years.
  • Analysis of needle types (pencil-point vs. cutting-point) and their association with PDPH.
  • Evaluation of diagnostic criteria, including the postural headache component.
  • Assessment of epidural blood patch (EBP) efficacy and optimal volume.

Main Results:

  • Smaller-gauge, pencil-point needles significantly reduce PDPH risk compared to traditional cutting-point (Quincke) needles.
  • A postural headache component is the defining characteristic of PDPH.
  • Autologous epidural blood patch (AEBP) is an effective treatment, with an optimal volume of 12-20 mL for adults.
  • AEBP is associated with rare complications.

Conclusions:

  • Minimizing needle gauge and utilizing pencil-point designs are key preventive measures for PDPH.
  • Early intervention with epidural blood patching is crucial for high-risk patients (<50 years, postpartum) after large-gauge dural puncture.
  • Autologous epidural blood patching is a safe and effective treatment for PDPH.