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Related Concept Videos

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...
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...
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...
Alterations in Blood Pressure01:30

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)...
Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...

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Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
09:14

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Spontaneous intracranial hypotension: a case study.

Tammy L Tyree1, Randall Porter

  • 1Barrow Neurosurgical Associates, Phoenix, Arizona, USA. tammy.tyree@bnaneuro.nete

Journal of the American Academy of Nurse Practitioners
|May 4, 2012
PubMed
Summary

Spontaneous intracranial hypotension (SIH) is a condition caused by cerebrospinal fluid (CSF) leaks, often presenting as orthostatic headaches. Early recognition by nurse practitioners is crucial for timely referral and management.

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Area of Science:

  • Neurology
  • Radiology
  • Neurosurgery

Background:

  • Spontaneous intracranial hypotension (SIH) is a clinical syndrome resulting from cerebrospinal fluid (CSF) loss.
  • It typically presents with orthostatic headaches due to reduced CSF volume and pressure.

Observation:

  • This case study illustrates a patient diagnosed with SIH.
  • Key diagnostic findings include diffuse pachymeningeal enhancement, cerebellar tonsillar descent, and subdural fluid collections on MRI.

Findings:

  • SIH often occurs without significant trauma, stemming from dural weaknesses or meningeal diverticula.
  • Cerebrospinal fluid (CSF) hypovolemia is the underlying pathophysiology.

Implications:

  • Nurse practitioners (NPs) must recognize SIH symptoms, particularly orthostatic headaches, in emergency and urgent care settings.
  • Prompt identification and referral by NPs can prevent iatrogenic complications and improve patient outcomes.