A Cerebrovascular Accident (CVA), commonly known as a stroke, is a medical emergency that occurs when the blood supply to part of the brain is interrupted or reduced, preventing brain tissue from getting oxygen and nutrients. Because brain cells can begin to die within minutes of oxygen deprivation, rapid recognition and intervention are critical to minimizing long-term neurological damage.
The Two Primary Types of Stroke
To understand stroke management, one must first distinguish between the two main physiological mechanisms: ischemia and hemorrhage. While both result in brain cell death, their causes and treatments are fundamentally different.
Ischemic Stroke
Ischemic strokes are the most common type, accounting for the majority of CVA cases. They occur when a blood vessel supplying the brain becomes obstructed, usually by a blood clot (thrombus) or a piece of plaque that has broken off from another part of the arterial system (embolus). This blockage creates a "downstream" effect where the brain tissue is starved of blood flow.
Hemorrhagic Stroke
A hemorrhagic stroke occurs when a weakened blood vessel ruptures and bleeds into the surrounding brain tissue. This is often caused by uncontrolled hypertension (high blood pressure) or an aneurysm. Unlike ischemic strokes, which involve a lack of flow, hemorrhagic strokes cause damage through two mechanisms: the loss of blood flow to healthy tissue and the increased intracranial pressure caused by the accumulating blood (hematoma) within the skull.
Clinical Note: The distinction between these two types is vital because treatments for ischemic stroke (such as "clot-busting" thrombolytic drugs) can be fatal if administered to a patient experiencing a hemorrhagic stroke.
Keep reading for free.
Create an account to finish this reading and make it part of your study routine.
Continue reading freeAlready have an account? Log in
Updated