Its main purpose is to restore partial flow of oxygenated blood to the brain and heart. ♥
To ensure patient's safety, the nurse should make sure aside from informing the patient and significant others to finish the treatment prescribed he or she should also make sure the patient is well hydrated like providing fluid replacement such as Oresol or drinks with electrolytes such as Gatorade to avoid dehydration.
If you monitor your practice run you can see how much your improved time wise.
