STROKE

The clinical manifestations of stroke depend largely on the type of stroke (ischemic or hemorrhagic), the vascular territory involved, the size of the lesion, and the side of the brain affected. Stroke results in a sudden interruption of blood supply to specific brain regions, leading to neuronal injury or death, which manifests as characteristic motor, sensory, cognitive, perceptual, and autonomic dysfunctions.

Motor Impairments

One of the most prominent clinical manifestations of stroke is motor dysfunction, typically presenting as hemiparesis or hemiplegia on the side of the body opposite to the affected cerebral hemisphere. Initially, during the acute stage, patients often experience flaccid paralysis, characterized by hypotonia, absent voluntary movement, and depressed reflexes. This phase is often referred to as cerebral shock. As recovery progresses into the subacute and chronic stages, muscle tone gradually increases, leading to spasticity, particularly in antigravity muscles.

Upper limb involvement is usually more severe than lower limb involvement. Patients commonly exhibit a flexor synergy pattern in the upper limb, with shoulder adduction and internal rotation, elbow flexion, forearm pronation, and wrist and finger flexion. In contrast, the lower limb often demonstrates an extensor synergy pattern, including hip extension and adduction, knee extension, ankle plantarflexion, and inversion. These abnormal movement patterns significantly impair functional activities such as reaching, grasping, standing, and walking.

Loss of selective motor control is another key feature. Patients may be unable to isolate joint movements and instead rely on mass movement patterns. Fine motor skills, particularly hand function, are often severely compromised, affecting activities of daily living like dressing, feeding, and writing.

Sensory Disturbances

Sensory impairments frequently accompany motor deficits following a stroke. Patients may experience reduced or absent sensations such as touch, pain, temperature, proprioception, and vibration on the affected side. Loss of proprioception is particularly disabling, as it interferes with joint position sense and movement awareness, leading to poor coordination and increased risk of falls.

Some individuals develop sensory neglect, where they fail to recognize sensory input from the affected side despite intact peripheral sensation. Sensory deficits significantly affect motor recovery because effective movement relies on continuous sensory feedback.

Abnormal Muscle Tone and Reflex Changes

Alterations in muscle tone are hallmark features of stroke. Initially, hypotonia predominates, but as upper motor neuron signs emerge, patients develop hypertonia and spasticity. This is accompanied by exaggerated deep tendon reflexes, clonus, and the presence of pathological reflexes such as the Babinski sign.

Spasticity often varies with posture, speed of movement, emotional state, and pain. Over time, prolonged abnormal tone may lead to muscle shortening, joint stiffness, and contractures, particularly in the shoulder, elbow, wrist, hip, knee, and ankle joints.

Postural Control and Balance Deficits

Stroke frequently impairs postural control, resulting in difficulty maintaining sitting and standing balance. Patients may demonstrate asymmetrical weight bearing, with a tendency to shift weight toward the unaffected side. Trunk control is often compromised, leading to poor alignment, reduced trunk rotation, and impaired anticipatory postural adjustments.

Damage to cortical and subcortical structures involved in balance and coordination can result in ataxia, particularly in strokes affecting the cerebellum. These patients may present with unsteady gait, wide base of support, and difficulty performing coordinated movements.

Gait Abnormalities

Gait is commonly affected following stroke. Typical hemiplegic gait patterns include circumduction of the affected leg, reduced hip and knee flexion during swing phase, foot drop due to dorsiflexor weakness, and reduced push-off during stance. Spasticity in plantarflexors often leads to toe walking or equinovarus foot posture.

Gait deviations increase energy expenditure and reduce walking efficiency, often limiting community ambulation and independence.

Speech and Swallowing Disorders

Stroke can significantly affect speech and swallowing functions, particularly when the dominant hemisphere or brainstem is involved. Aphasia may occur, affecting expressive language (Broca’s aphasia), receptive language (Wernicke’s aphasia), or both. Patients may have difficulty forming words, understanding speech, reading, or writing.

Dysarthria, caused by weakness or incoordination of speech muscles, results in slurred or unclear speech. Dysphagia is also common and poses a serious risk for aspiration, malnutrition, and pneumonia.

Cognitive and Perceptual Deficits

Cognitive impairments are frequent and include difficulties with attention, memory, executive function, problem-solving, and judgment. Patients may have reduced ability to plan, initiate, and sequence tasks, which significantly affects functional independence.

Perceptual disorders such as unilateral spatial neglect, especially following right hemisphere stroke, lead patients to ignore the affected side of the body or environment. Visual field defects, such as homonymous hemianopia, may also occur, further impairing mobility and safety.

Emotional and Behavioral Changes

Emotional disturbances are common after stroke. Patients may experience depression, anxiety, emotional lability, or pseudobulbar affect, characterized by inappropriate laughing or crying. These changes can negatively influence motivation, participation in rehabilitation, and overall quality of life.

Personality changes and reduced social interaction may also be observed, placing emotional strain on caregivers and family members.

Autonomic and Secondary Complications

Stroke can disrupt autonomic regulation, leading to issues such as blood pressure instability, bladder and bowel dysfunction, and impaired thermoregulation. Secondary complications include shoulder subluxation, pain (especially hemiplegic shoulder pain), pressure sores, deep vein thrombosis, and respiratory infections due to reduced mobility.

Functional Impact

Collectively, these clinical manifestations result in varying degrees of functional disability, affecting self-care, mobility, communication, and social participation. The severity and combination of impairments differ among individuals, making stroke a highly heterogeneous condition requiring individualized assessment and rehabilitation planning.