Bradycardia is a slower than normal heart rate, which can lead to a range of symptoms such as feeling faint, tired or short of breath.
Heart arrhythmias are irregular heartbeats. The heart can beat too fast, too slow or irregularly — learn how to recognise the symptoms here.
Morphine is an opioid-based medicine available on prescription from your doctor. Find out more about morphine, how it works and possible side effects.