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Stroke: Introduction and Types

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...

Hemorrhagic Stroke ll: Pathophysiology

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...

Hemorrhagic Stroke l: Introduction

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...

Ischemic Stroke l: Introduction

Ischemic Stroke l: Introduction

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.

Ischemic Stroke ll: Pathophysiology

Ischemic Stroke ll: Pathophysiology

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...

Transient Ischemic Attack l: Introduction

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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Related Experiment Video

Updated: Jun 28, 2026

Integrated Photoacoustic, Ultrasound, and Angiographic Tomography (PAUSAT) for NonInvasive Whole-Brain Imaging of Ischemic Stroke

Integrated Photoacoustic, Ultrasound, and Angiographic Tomography (PAUSAT) for NonInvasive Whole-Brain Imaging of Ischemic Stroke

Published on: June 2, 2023

Stroke in Pakistan.

Bhojo A Khealani¹, Bilal Hameed, Uzma U Mapari

¹Department of Medicine, Aga Khan University Hospital, Karachi.

JPMA. the Journal of the Pakistan Medical Association

|November 8, 2008

Summary

This summary is machine-generated.

Stroke incidence is rising in Asia, with Pakistan facing a high burden of risk factors like diabetes and hypertension. Many patients are unaware of their conditions, leading to uncontrolled hypertension and significant health consequences.

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Area of Science:

Neurology
Public Health
Epidemiology

Background:

Stroke is a primary cause of long-term disability and mortality globally.
While stroke incidence declines in Western countries, it is increasing in Asia.
Pakistan faces a substantial burden of stroke risk factors, including a high prevalence of diabetes and hypertension, with many individuals unaware of their diagnosis.

Purpose of the Study:

To review the available literature on stroke and its associated risk factors in Pakistan.
To highlight the epidemiological differences and challenges in stroke management within the Pakistani context.

Main Methods:

A comprehensive review of existing literature on stroke and its risk factors in Pakistan was conducted.
Analysis focused on reported case series and epidemiological data to identify trends and patterns.

Main Results:

Data on stroke incidence and prevalence in Pakistan is limited but suggests significant variations compared to Western countries.
High rates of undiagnosed and uncontrolled hypertension and diabetes contribute to the stroke burden.
The absolute number of stroke cases in Pakistan is estimated to be in the millions, with profound individual and societal impacts.

Conclusions:

Pakistan faces a growing stroke problem due to a high prevalence of modifiable risk factors and challenges in diagnosis and management.
Urgent public health interventions are needed to address the escalating burden of stroke and its consequences in Pakistan.