A slow heart rate, usually defined as less than 60 beats per minute.

This can occur in normal people, particularly during sleep; trained athletes also usually have slow pulse and heart rates.

A slow heart rate that results from a heart disease.

Slow heart rate due to disease of the central nervous system, particularly that which is associated with increased intracranial pressure.

A slow heart beat in the absence of any pathological explanation.

A persistent fetal heart rate slower than 120 beats per minute throughout one ten-minute period.

A slow sinus rhythm with an atrial rate below 60 beats per minute in an adult and 70 beats per minute in a child.