In these instances, it has been postulated that extreme anxiety can be associated with a hyperdynamic hemodynamic phase that calls forth antagonistic reflexes (parasympathetic nervous system) to prevent the BP and HR from rising out of control.
Then, if the hyperdynamic processes cease abruptly, the opposing reflex mechanisms will be suddenly unopposed, and fainting will occur.
Noted that bradycardia associated with a faint was reversed by atropine, but arterial pressure did not return to normal, nor did the subjects fully regain consciousness
The term vasovagal was introduced to describe the circulatory alterations responsible for production of the syncopal reaction
Vasovagal Care First, assess your patient Decreased BP Decreased BP Decreased HR Decreased HR Lie down Observe O 2 ± Trendelenberg ± NS Conscious Loss of Consciousness Lie down Trendelenberg O 2 NS Lie down Trendelenberg O 2 NS / Atropine Lie down Trendelenberg O 2 Atropine
Occurs when a large amount of unoxygenated radiological contrast agent is given as an IV bolus. The IV bolus produces transient rise in pulmonary artery pressure and cardiac output and decrease in systemic vascular resistance. It can also produce hemodynamic changes in the vein
Patients may complain of burning, feelings of warmth or flushing, or a metallic taste in the mouth
Max walked a post cardiac cath patient to the rest room. While walking back to his room, the patient noticed an area of blood, about the size of a quarter, on his gown. He promptly c/o lightheadedness.