Familial Reflex Myoclonus (of Labrador Retrievers)
Myoclonus is a brief sudden jerk-like movement that occurs due to involuntary contraction of one or more muscles. Familial reflex myoclonus is a specific form of myoclonus common in Labrador Retrievers which differs from other forms of myoclonus because episodes are often stimulus-induced.
Age of Onset: 3 weeks of age
Sex Predisposition: Any sex of animal can be affected
Clinical Course:
Episodes of myoclonus are typically associated with a stimulus (postural manipulations, auditory stimuli, or tactile stimuli).
Episodes of myoclonus are typically associated with a stimulus (postural manipulations, auditory stimuli, or tactile stimuli).
Clinical Signs:
Posture and Appearance
Decerebrate posture with opisthotonus
Movement
Simultaneous contraction of the appendicular and axial muscles
Increased extensor tone
Collapse into lateral recumbency
Cranial Nerves
Contraction of facial muscles
Special Functions (e.g. respiration; urination)
Respiratory distress
Posture and Appearance
Decerebrate posture with opisthotonus
Movement
Simultaneous contraction of the appendicular and axial muscles
Increased extensor tone
Collapse into lateral recumbency
Cranial Nerves
Contraction of facial muscles
Special Functions (e.g. respiration; urination)
Respiratory distress
Neuromuscular
Unknown
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