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Cushing reflex (also referred to as the vasopressor response, the Cushing effect, the Cushing reaction, the Cushing phenomenon, the Cushing response, or Cushing's Law) is a physiological nervous system response to increased intracranial pressure (ICP) that results in Cushing's triad of increased blood pressure, irregular breathing, and bradycardia. [1]
Intracranial pressure (ICP) is the pressure exerted by fluids such as cerebrospinal fluid (CSF) inside the skull and on the brain tissue. ICP is measured in millimeters of mercury and at rest, is normally 7–15 mmHg for a supine adult. This equals to 9–20 cmH 2 O, which is a common scale used in lumbar punctures. [1]
A Cushing ulcer, named after Harvey Cushing, [1] [2] is a gastric ulcer associated with elevated intracranial pressure. It is also called von Rokitansky –Cushing syndrome. [ 2 ] Apart from the stomach , ulcers may also develop in the proximal duodenum and distal esophagus .
Cushing syndrome can be hard to diagnose. Here's what it is, as well as what causes it and how it's treated.
Cushing's syndrome is a collection of signs and symptoms due to prolonged exposure to glucocorticoids such as cortisol. [4] [9] [10] Signs and symptoms may include high blood pressure, abdominal obesity but with thin arms and legs, reddish stretch marks, a round red face due to facial plethora, [11] a fat lump between the shoulders, weak muscles, weak bones, acne, and fragile skin that heals ...
When cortisol levels are extremely high, which can cause Cushing syndrome, there are drastic signs like "distinctive changes in body fat distribution, such as the development of a rounded face ...
Cardiovascular and pulmonary symptoms may also be present as the brain loses function, but might also be associated with bleeding. These symptoms are known as Cushing's Triad: hypertension (with widening pulse pressure), irregular respirations (commonly Cheyne-Stokes), bradycardia and in severe cases cardiac arrest. [3] [4]
The symptoms of Cushing's disease are similar to those seen in other causes of Cushing's syndrome. [5] Patients with Cushing's disease usually present with one or more signs and symptoms secondary to the presence of excess cortisol or ACTH. [6] Although uncommon, some patients with Cushing's disease have large pituitary tumors (macroadenomas).