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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...
Aneurysm I: Introduction01:30

Aneurysm I: Introduction

An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...
Aneurysm II: Clinical Manifestations and Diagnostic Studies01:21

Aneurysm II: Clinical Manifestations and Diagnostic Studies

Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
Aneurysm III: Interprofessional Care01:26

Aneurysm III: Interprofessional Care

Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...
Aneurysm IV: Nursing Management01:22

Aneurysm IV: Nursing Management

Vigilant monitoring for aneurysm rupture is essential for patients undergoing aortic surgery.Preoperative Nursing ManagementContinuously monitor the patient for manifestations of aneurysm rupture, such as pallor, weakness, tachycardia, hypotension, abdominal, back, groin, or periumbilical pain, changes in consciousness, and a pulsating abdominal mass. Regularly assess the patient's peripheral pulses.Instruct the patient to consume a clear liquid diet the day before surgery and administer...

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Related Experiment Video

Updated: May 22, 2026

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

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

Published on: August 30, 2020

Nonaneurysmal subarachnoid hemorrhage: an update.

Young Woo Kim1, Matthew F Lawson, Brian L Hoh

  • 1Department of Neurosurgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. youngwookim1732@gmail.com

Current Atherosclerosis Reports
|May 29, 2012
PubMed
Summary

Nonaneurysmal subarachnoid hemorrhage (NA-SAH) is complex, with distinct perimesencephalic (PMN-SAH) and non-perimesencephalic (nPMN-SAH) subtypes. Differentiating these and aneurysmal SAH is crucial for appropriate patient management.

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

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

Published on: June 18, 2021

Related Experiment Videos

Last Updated: May 22, 2026

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

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

Published on: August 30, 2020

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

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

Published on: June 18, 2021

Area of Science:

  • Neurology
  • Neurosurgery
  • Radiology

Background:

  • Nonaneurysmal subarachnoid hemorrhage (NA-SAH) encompasses diverse etiologies and clinical presentations.
  • Perimesencephalic (PMN-SAH) and non-perimesencephalic (nPMN-SAH) are distinct subtypes with varying prognoses.
  • The etiology of NA-SAH remains largely uncertain, necessitating careful diagnostic approaches.

Purpose of the Study:

  • To highlight the heterogeneity within NA-SAH.
  • To emphasize the importance of differentiating PMN-SAH from nPMN-SAH and aneurysmal SAH.
  • To discuss diagnostic strategies for NA-SAH.

Main Methods:

  • Review of clinical data and diagnostic imaging (CT, cerebral angiography).
  • Classification of SAH into PMN-SAH, nPMN-SAH, and aneurysmal SAH.
  • Analysis of clinical course and outcomes based on SAH subtype.

Main Results:

  • PMN-SAH is often identifiable on CT and requires negative angiography for confirmation.
  • nPMN-SAH necessitates aggressive diagnostic evaluation and management.
  • Convexal NA-SAH, a subtype with varied causes, generally shows a favorable prognosis.

Conclusions:

  • Accurate differentiation of NA-SAH subtypes is critical for guiding patient management.
  • CT and cerebral angiography play key roles in diagnosing PMN-SAH.
  • Understanding subtype-specific characteristics informs prognosis and treatment strategies for NA-SAH.