A heart murmur can also be a sign of HCM Hypertrophic Cardiomyopathy.

Hypertrophic = abnormal enlargement of an organ
Cardio= heart
Myo = muscle
Pathy= disease

One of the symptoms of it can be syncope (fainting)

It is linked genetically and the only way to diagnose it is an ecg (echogardiogram of the heart) by a board certified cardiologist.

My dear friend has a Sphynx that has it. He was having fainting spells and one vet mis-diagnosed him with seizures. It wasn't until she had the scan done that they found it.

Have your friend ask her vet about it. To this day, I think that MooShoo had it, as it is more common in rare breeds like the Sphynx (he was only 10), although furred cats can also get it. My vet said it was Thrombosis. I just don't think so. Hind sight has 20/20 vision. All the signs he had (it came on very quickly) point to it. My heart is still broken.

Please keep us posted, Sandie.