The most common cause of renal artery stenosis is atherosclerosis, the same condition that causes narrowing of the arteries in coronary heart disease and stroke, and the risk factors are the same as well. Cholesterol plaques build up along the walls of the renal artery and gradually cause narrowing.
Oxytocin is a commonly used uterotonic that can cause significant and even fatal hypotension, particularly when given as a bolus. The resulting hypotension can be produced by a decrease in systemic vascular resistance or cardiac output through a decrease in venous return.
These send nerve impulses to the hypothalamus. The hypothalamus produces oxytocin which it sends to the posterior pituitary which secretes it into blood. Oxytocin hormone induces uterine contraction. These contractions stimulates further production of oxytocin which cause even further contractions.It is the only hormone the functions on positive feedback.hese send nerve impulses to the hypothalamus. The hypothalamus produces oxytocin which it sends to the posterior pituitary which secretes it into blood. Oxytocin hormone induces uterine contraction. These contractions stimulates further production of oxytocin which cause even further contractions.