Which type of stroke is characterized by the sudden onset of neurological deficits?

The type of stroke characterized by the sudden onset of neurological deficits is ischaemic stroke. Ischaemic strokes occur when there is a blockage in a blood vessel supplying blood to the brain, leading to an interruption of blood flow. This results in the affected brain tissue quickly becoming deprived of oxygen and nutrients, thus causing sudden neurological symptoms such as weakness, speech difficulties, or loss of coordination.

Transient ischemic attacks (TIA) also present with sudden neurological deficits; however, they are temporary and typically resolve within 24 hours, which distinguishes them from full-blown ischaemic strokes. Hemorrhagic strokes occur due to bleeding into or around the brain, resulting in similar acute symptoms but are classified differently due to the underlying pathophysiology of bleeding rather than blockage. Subdural hematomas are a form of hemorrhage that usually develops over time and is marked by more gradual symptoms rather than the acute onset typical of strokes.