Paul McCartney wrote this as Hey Jules, a song meant to comfort John Lennon's 5-year-old son Julian as his parents were getting a divorce. The change to Jude was inspired by the character Jud in the musical Oklahoma! (McCartney loves show tunes)
The medical term for a slow heart rate is bradycardia; generally defined as a heart rate below 60 bpm (beats per minute). In contrast, tachycardia means fast heart rate above 100 bpm.
A pulse rate that is too low can be dangerous. Photo Credit Jupiterimages/Photos.com/Getty Images. Keeping track of your blood pressure and pulse lets you know how hard your heart is working and what your risk for heart disease is. A normal pulse rate at rest is between 60 and 100 beats per minute. Generally, a lower pulse rate means that your heart muscle is not having to beat too hard to do its job.