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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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.
this is a lovely series of videos, glad I found it! many thanks
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
Thank you very much for all your videos.
I knew I had ALS before my doctors did thanks to your videos.
Very informative video and educational for new patients.
Great video, thanks!
Great lecture !!
Woww
👍🏻
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.