I didn't cover this because I think it goes beyond what a medical student needs to know about EMG. In a nutshell, H waves parallel what is assessed when checking ankle jerks (Achilles reflex) on exam. So, it may be absent in an S1 radiculopathy, but also in a polyneuropathy. There are many limitations (they can be normal in S1 radiculopathy, are often absent in individuals > 60, etc.) and so I would consider it to be - in general - a less important part of the EMG study. Hope that helps.
You channel is so underrated, very high quality content.
Gonna share it to my colleagues
I have ALS and have watched your videos to learn what's happening to me. Thank you. I have some videos that show my clinical exam features.
Thank you very much for all your videos.
There are many videos on this topic but yours only tells the exact concept needed
i enjoyed your video and your clear expression thank you
this is a lovely series of videos, glad I found it! many thanks
I knew I had ALS before my doctors did thanks to your videos.
Very informative video and educational for new patients.
from a recent graduate point of view this is very well summarised and refined, please continue with these lectures
Great video, thanks!
Woww
Great lecture !!
sir, please explain absent of h reflex biletarally..
I didn't cover this because I think it goes beyond what a medical student needs to know about EMG. In a nutshell, H waves parallel what is assessed when checking ankle jerks (Achilles reflex) on exam. So, it may be absent in an S1 radiculopathy, but also in a polyneuropathy. There are many limitations (they can be normal in S1 radiculopathy, are often absent in individuals > 60, etc.) and so I would consider it to be - in general - a less important part of the EMG study. Hope that helps.
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