Quadriparesis

Quadriparesis is a medical term describing weakness in all four limbs, often including trunk muscles. It results from disruption of motor pathways affecting both the arms and legs, and is typically due to injury or disease involving the cervical spinal cord, brainstem, or regions of the brain that control limb movement. It differs from quadriplegia, which implies complete paralysis rather than partial weakness.

Causes of quadriparesis are diverse and can be broadly categorized as traumatic, vascular, inflammatory, infectious, demyelinating, compressive, metabolic, or toxic. Common etiologies include cervical spinal cord injury or compression, strokes or brainstem strokes, multiple sclerosis, inflammatory myelopathies, tumors or abscesses, Guillain-Barré syndrome affecting the arms and legs, and severe metabolic disturbances such as electrolyte abnormalities or sepsis.

Clinical features typically include symmetric weakness in both arms and both legs, with reduced strength that may be accompanied by altered reflexes, sensory changes, or cranial nerve involvement if the brainstem is affected. Respiratory muscle weakness can occur and may require monitoring or ventilatory support. The course may be acute after trauma, subacute in vascular events, or chronic in progressive diseases.

Diagnosis relies on neurological examination and targeted testing. Imaging, especially MRI of the brain and cervical spine, helps identify structural causes. CT may be used in acute trauma. Laboratory studies, cerebrospinal fluid analysis, and electrodiagnostic tests (nerve conduction studies and EMG) aid in distinguishing central from peripheral causes.

Treatment focuses on the underlying cause, stabilization, and rehabilitation. Management may involve emergency care for spinal injury, anti-inflammatory or immunomodulatory therapies for inflammatory conditions, antibiotics or surgery for infections or compression, and intensive physical and occupational therapy to maximize function. Prognosis varies with etiology, severity, and response to treatment.