British Thermal Unit is a standard unit of energy that is measured at about 1055 joules. The British Thermal Unit (BTU or Btu) is primarily used in the United States more than in the United Kingdom. This energy unit is the total amount of thermal energy that is required to heat or cool 1 pound of water significantly by 1Â°Fahrenheit.
Bradyphrenia is a neurological term referring to the slowness of thought common to many disorders of the brain.
Bradycardia is an abnormally slow heart rate. In adults, it is defined as a heart rate of less than 60 beats per minute. Different types of bradycardia include (collectively referred to as bradyarrhythmias):1  Sinus bradycardia: an unusually slow heartbeat due to heart disease, a reaction to medication, or normal causes (such as excellent fitness or deep relaxation).n adults, it is defined as a heart rate of less than 60 beats per minute. Different types of bradycardia include (collectively referred to as bradyarrhythmias): 1  Sinus bradycardia: an unusually slow heartbeat due to heart disease, a reaction to medication, or normal causes (such as excellent fitness or deep relaxation).