A slow heart rate is called bradycardia. Some irregular heartbeats are normal: 1  Sinus arrhythmia is the normal variation in heart rate that accompanies breathing in and out.  Sinus tachycardia is the normal increase in the heart rate that occurs in healthy people when they are excited, exercising, or have a fever.
There are four tabby patterns that have been shown to be genetically distinct: Mackerel, Classic, spotted, and ticked. A fifth includes tabby as part of another basic color pattern. The patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively).All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds.A modified Classic tabby is found in the Sokoke breed.he patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively). All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds. A modified Classic tabby is found in the Sokoke breed.
Cats born of Siamese parents sometimes have a tabby/spotted pattern breaking through so strongly that the cat appears to be a tabby/spotted Oriental or a tabby/spotted sepia (Burmese) pattern. Viewed closely, the pattern colour is heavily ticked on a paler ticked background.