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Related Concept Videos

Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

44
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
44
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

54
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
54
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

18
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...
18
Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

20
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...
20
Acute Coronary Syndrome IV: Interprofessional Care01:28

Acute Coronary Syndrome IV: Interprofessional Care

522
IntroductionThe management of Acute Coronary Syndrome (ACS) aims to minimize myocardial damage, preserve myocardial function, and prevent complications.Initial ManagementInpatient management involves continuous cardiac monitoring, preferably in an ICU, focusing on blood pressure, serum sodium, potassium, and creatinine levels, and urine output. Ongoing pharmacologic management is crucial for stabilizing the patient.Supplemental Oxygen: Administer supplemental oxygen if oxygen saturation is...
522
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

30
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...
30

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A Fibrin-Enriched and tPA-Sensitive Photothrombotic Stroke Model
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Collateral lessons from recent acute ischemic stroke trials.

David S Liebeskind

    Neurological Research
    |March 20, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Collateral blood flow significantly impacts acute ischemic stroke outcomes, influencing injury progression and treatment effectiveness. Recent trials suggest focusing on collaterals may be more crucial than the specific intervention used for stroke treatment.

    Keywords:
    Collateral,Ischemia,Neuroprotection,ReperfusionStroke,

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    Area of Science:

    • Neurology
    • Vascular Medicine
    • Interventional Neuroradiology

    Background:

    • Recent acute ischemic stroke trials have yielded extensive data on stroke pathophysiology and patient outcomes.
    • The role of collateral circulation in influencing stroke severity, injury progression, and therapeutic response is increasingly recognized.

    Purpose of the Study:

    • To analyze the impact of collateral perfusion on patient outcomes in acute ischemic stroke.
    • To evaluate the findings from recent major stroke trials, including SENTIS, MR RESCUE, and IMS III, in the context of collateral function.
    • To highlight the potential underestimation of collateral importance in current and developing stroke treatment strategies.

    Main Methods:

    • Review and analysis of data from recent large-scale randomized controlled trials in acute ischemic stroke.
    • Examination of studies focusing on device therapies (e.g., TREVO2, SWIFT) and endovascular interventions.
    • Assessment of how collateral status influences various aspects of stroke, such as recanalization, reperfusion, and hemorrhagic transformation.

    Main Results:

    • Despite extensive research and multiple trials, no new stroke treatment has unequivocally improved patient outcomes.
    • Collateral perfusion varies significantly among individuals and dramatically affects ischemic injury timelines, stroke severity, and imaging characteristics.
    • Collateral status demonstrably influences recanalization rates, reperfusion success, risk of hemorrhagic transformation, and subsequent neurological recovery.

    Conclusions:

    • Collateral circulation plays a pivotal role in acute ischemic stroke, potentially exceeding the influence of the chosen treatment modality.
    • Lessons learned from recent stroke trials emphasize the need to incorporate collateral assessment into trial design and clinical practice.
    • Future stroke research and therapeutic development should prioritize understanding and potentially augmenting collateral pathways for improved patient outcomes.