I use a polar heart rate monitor when riding my bicycle. When I go into afib, it does show the rapid heart rate. Mine has been between 130 to 170 beats per minute and everything in between. The personal heart rate monitors are not made to read afib, but it does reflect the rapid pace and shows that it is irregular. I would think the nurse is using better equipment. I hope this answers your question.
I also work out using a Polar device. I have found them to be quite accurate, but they tend to take a bit of time to center in when an irregular heartbeat is detected. The Polar won't be able to tell if it is afib or vfib, it isn't programmed that way. The fact that you have an irregular heartbeat in my opinion should be investigated.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.