A site for medical students - Practical,Theory,Osce Notes

What are the common causes of Hyporeflexia?

Hyporeflexia is a condition characterized by the absence or diminished reflex in reaction to an applied stimulus. This condition is associated with the lower motor neuron disease defined by a deficit in the nerve that runs through the spinal cord going to the extremities.
Hyporeflexia is the hallmark of LMN lesion .It is also seen in UMN shock
LMN lesions
  • AHC
  • Root
  • plexus
  • nerve
  • muscle
  • Neurological shock
  • Severe extrapyramidal rigidity
  • Contracture
  • Peripheral neuropathy
  • GBS
  • SACD
  • Tabes dorsalis
  • Friedreich's ataxia
  • Periodic paralysis
  • Cerebral or spinal shock

Isolated loss of a rellex usually suggests radiculopathy.
Symmetrical loss of rellex may be found in peripheral neuropathy.
Reflexes may be absent if the patient is unable to relax.
A reflex seems lost or diminished in defect of technique, relaxation, or observation.