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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

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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...
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Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
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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

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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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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...

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Intracranial hypotension with spinal pathology.

Joji Inamasu1, Bernard H Guiot

  • 1Department of Neurosurgery, University of South Florida College of Medicine, Tampa, FL 33606, USA. ginamasu@aol.com

The Spine Journal : Official Journal of the North American Spine Society
|August 29, 2006
PubMed
Summary

Intracranial hypotension (IH) is a syndrome caused by cerebrospinal fluid (CSF) loss, often from spinal leaks. Spine surgeons must understand IH, as it can stem from spontaneous or secondary causes, including trauma and iatrogenic factors.

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Published on: March 26, 2019

Area of Science:

  • Neurosurgery
  • Spinal Surgery
  • Neurology

Background:

  • Intracranial hypotension (IH) is a syndrome characterized by neurological symptoms due to cerebrospinal fluid (CSF) volume depletion.
  • Spinal dural sac defects are the most common cause of CSF leakage leading to IH.
  • Causes are classified as spontaneous (primary) or secondary, with relevance to spine surgeons due to trauma, procedures, and degenerative conditions.

Purpose of the Study:

  • To provide an updated review of intracranial hypotension (IH) knowledge specifically for spine surgeons.
  • To highlight the importance of understanding IH in the context of spinal pathology and surgical considerations.

Main Methods:

  • A comprehensive literature review was conducted.
  • The search utilized the PUBMED database, focusing on studies published between 1966 and 2005.
  • Literature concerning intracranial hypotension associated with spinal pathology was systematically reviewed.

Main Results:

  • Cerebrospinal fluid (CSF) leaks in spontaneous intracranial hypotension (IH) commonly occur in the lower cervical and upper thoracic spine.
  • Risk factors for spontaneous IH include mechanical stress, meningeal diverticula, and connective tissue disorders.
  • Iatrogenic causes of IH encompass lumbar puncture, spine surgery, and chiropractic manipulation; degenerative spine disorders are rare secondary causes.

Conclusions:

  • Characteristic spinal imaging findings for IH include extradural fluid, meningeal enhancement, engorged epidural veins, and tonsillar descent.
  • Conservative management, such as autologous epidural blood patch, is effective for most spontaneous IH cases; surgery is reserved for refractory cases.
  • Treatment of underlying conditions is crucial for secondary IH, potentially resolving CSF leaks and symptoms.