A rapid pulse is almost always found in fever, and the more severe the infection and the weaker the heart the more rapid is the pulse.
The muscle becomes weak, the heart contractions are insufficient, and heart weakness is shown by general weakness, shortness of breath, and weak, rapid pulse.
Auricular fibrillation, while generally causing a rapid pulse (though by no means all beats are transmitted to the peripheral arteries), tray cause a slow pulse because some of the contractions of the heart are not transmitted.
As to whether a slow or a more or less (but not excessively) rapid pulse in any one is abnormal depends entirely on whether that speed is normal or abnormal for that person.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "rapid pulse" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
