If you have a heart condition, being outside when it is very cold can bring on symptoms. Talk to your doctor about the symptoms you have been experiencing. It is really important that you try and keep warm during this cold weather. For more information about cold weather and keeping warm, you may like to read our factsheet.
A heart rate of 140bpm is higher than normal, so it is very important that you get this double checked by a doctor, as soon as possible.