Some shops mark their cylinders in 4 parts, (90 degrees apart) at each end of the cylinder and get 8 readings per cylinder. Unfortunately, not many will take the time to do this.So be cautious of the readings that you are given. Qualify them if you can.
Vasovagal syncope (also called cardioneurogenic syncope) is a condition in which temporary loss of consciousness is caused by a neurological reflex that produces either sudden dilation of the blood vessels in the legs, or a very slow heart rate (bradycardia), or both.
Micturition Syncope (Fainting During Urination or Bowel Movements) One of the most common causes of syncope, (passing out or fainting), occurs when a person strains to urinate or have a bowel movement. This stimulates the vagus nerve, increasing acetylcholine in the body and dilating blood vessels, causing blood pressure to fall and decreasing blood supply to the brain.