Final answer:
An Addisonian crisis is also known as acute adrenal insufficiency, (option 1) a serious condition due to insufficient cortisol production by the adrenal glands, characterized by severe symptoms such as weakness and low blood pressure, requiring cortisol replacement treatment.
Step-by-step explanation:
An Addisonian crisis, also known as acute adrenal insufficiency, is a potentially life-threatening condition that occurs when there is not enough cortisol, a hormone produced by the adrenal glands. It can be caused by Addison's disease, where the adrenal glands do not produce enough cortisol due to damage or malfunction, or as a result of decreased ACTH availability from the pituitary gland. Symptoms of Addisonian crisis can include severe weakness, low blood pressure, abdominal pain, and shock. Diagnosis usually involves blood tests and imaging, with treatment being cortisol replacement therapy.