《H Singapore》.ppt

Soleus H-reflex and S1 Radiculopathy Patrick Zhu M.D. Upstate Medical University State University of New York * A B H - M = 6.8 ± 0.5 ms M H M H 17.5 ± 0.3 cm Fig 3 Fig 1 Fig 2 A B H - M = 6.8 ± 0.5 ms M H M H 17.5 ± 0.3 cm Fig 3 Fig.1 Schematic representation of soleus H-reflexes from electrical stimulation of the S1 nerve root (1) between the spinal processes of L4-5 level, (2) at the S1 foramen and (3) of the tibial nerve at the popliteal fossa. Fig.2 A 41-years-old woman, 170cm, with right S1 radiculopathy. The latency of tibial H-reflex (A) shows no significant difference between the two sides. Note the increased S1 foramen HMI on the right side (B). Fig.3 A 39-years-old man, 168cm, with left S1 radiculopathy. Note the increased tibial H-reflex latency (A) and S1 foramen HMI (B) on the involved side. normal L4-5 level HMI (C) shows no significant difference on both sides. Fig.4 A 51-years-old woman, 167cm, with right S1 radiculopathy. The tibial H-reflex is absent on the right (A). S1 foramen H-reflex is present, with HMI (B) markedly increased on the involved side. * * * *