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Grades of a murmur and what they mean

Catzzzmeow

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We often hear about cats/kittens having murmurs. We hear they are graded in severity from grade 1 through grade 6. I thought sharing exactly what those grades mean might be helpful to many as most only hear the number. Just a reminder some kittens outgrow murmurs in their first year and that a murmur does not always mean HCM positive. Only about 50% of cats that develop HCM even have an audible murmur. The only true way to test for HCM is getting an echocardiogram done. The recommended age to have a cat heart scanned is when then reach maturity around 1 years of age.


Grade I — barely audible
Grade II — soft, but easily heard with a stethoscope
Grade III — intermediate loudness; most murmurs which are related to the mechanics of blood circulation are at least grade III
Grade IV — loud murmur that radiates widely, often including opposite side of chest
Grade V — very loud, audible with stethoscope barely touching the chest; the vibration is also strong enough to be felt through the animal’s chest wall
Grade VI — very loud, audible with stethoscope barely touching the chest; the vibration is also strong enough to be felt through the animal’s chest wall.
 

Yoda mom

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@Catzzzmeow thank you for posting this thread..

I know my active kitten like Yoda man has a grade 3 murmur and just turned 9yrs old Sept 6.
Toby I was told 5 yrs ago is grade 1. Batman Grade 1 years ago too
ClaireBare no murmur

Wanted to share that my vet offered me to listen to the murmur with her stethoscope.
Now I took mine of of my EMT kit to take a listen too

Everyday is a gift

hugs n head smooches
 

Annejo12

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Thank you. My kitty has a murmur but I have never asked my vet what grade. Now I know it would be a good thing to ask. The first time she heard it she did some tests to see if my kitty had heart trouble. She has never been concerned about it so I haven't been worried.

Sphynxlair is a great place for support and information!
 

Uksphynxmum

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My precious Rizzy was diagnosed with grade 2 murmur at about 8 months. I lost him at 12 years 3 months to HCM. The murmur stayed grade 2 throughout his life. HCM only made him unwell for 3 months x
 

Fayiza

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As a new Sphynx owner the possibility of HCM is frightening, even the thought of any murmur development has scared me. But, having a detailed breakdown of each grade murmur helps it seem less scary, so thank you so much! I am bookmarking this in case I ever need to refer to it in the future.
 

kauna

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Thank you for sharing the information. We can learn a lot from one another. Love this group
 

oolahappi

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Thanks for the share. My 2.5 year old is HCM negative, but grade 2 murmur. My 10 week old not HCM tested, no murmur. For the former, my vet said nothing to be concerned about right now and it may never progress beyond grade 2.
 

Sheldon13

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From a nurse’s perspective:

In people murmurs are similarly graded. It is VERY common for children to have a low grade murmur that self resolved as they age. Even if it sticks around a grade 1 or 2 murmur is unlikely to cause much of an issue. The only thing I can think of is a higher likelihood to throw a clot. As long as they are otherwise healthy though this shouldn’t really happen.


Sent from my iPhone using Tapatalk Pro
 

Yoda mom

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@JojoCatMama I still recall that sinking feeling when the vet looked up at me and handed me the stethoscope to listen to his grade 3 murmur ..
having a great working relationship with your vet definitely brings peace of mind and a course of action to follow.

He has no idea he has a grade 3 murmur ...
two of the others have grade 1 for years ... no issues

they only know our love

(((hugs))) and positive vibes
will follow your thread for updates
 
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