Insufficiency may refer to:

Medical conditions

Circulatory system

* Aortic insufficiency (AI), also known as aortic regurgitation (AR), the leaking of the aortic valve of the heart that causes blood to flow in reverse during ventricular diastole, from the aorta into the left ventricle *

Arterial insufficiency Peripheral artery disease (PAD) is an abnormal narrowing of arteries other than those that supply the heart or brain. When narrowing occurs in the heart, it is called coronary artery disease, and in the brain, it is called cerebrovascular diseas ...

, insufficient blood flow through the arteries typically caused by atherosclerosis ** Arterial insufficiency ulcer (also known as "Ischemic ulcers"), mostly located on the lateral surface of the ankle or the distal digits * Chronic venous insufficiency or CVI is a medical condition where the leg veins cannot pump enough oxygen-poor blood back to the heart **

Venous insufficiency ulceration Venous ulcer is defined by the American Venous Forum as "a full-thickness defect of skin, most frequently in the ankle region, that fails to heal spontaneously and is sustained by chronic venous disease, based on venous duplex ultrasound testing." ...

, as well as stasis dermatitis, a skin condition that results from increased pressure in the venous system of the lower leg *

Placental insufficiency Placental insufficiency or utero-placental insufficiency is the failure of the placenta to deliver sufficient nutrients to the fetus during pregnancy, and is often a result of insufficient blood flow to the placenta. The term is also sometimes use ...

, insufficient blood flow to the placenta during pregnancy *

Pulmonary valve insufficiency Pulmonary (or pulmonic) insufficiency (or incompetence, or regurgitation) is a condition in which the pulmonary valve is incompetent and allows backflow from the pulmonary artery to the right ventricle of the heart during diastole. While a small a ...

(or incompetence, or regurgitation) is a condition where the pulmonary valve is not strong enough to prevent backflow into the right ventricle * Tricuspid insufficiency, a valvular heart disease also called Tricuspid regurgitation, refers to the failure of the heart's tricuspid valve to close properly during systole * Vertebrobasilar insufficiency (VBI), or vertebral basilar ischemia, a temporary set of symptoms due to decreased blood flow in the posterior circulation of the brain

Endocrine system

Adrenal insufficiency Adrenal insufficiency is a condition in which the adrenal glands do not produce adequate amounts of steroid hormones. The adrenal gland normally secretes glucocorticoids (primarily cortisol), mineralocorticoids (primarily aldosterone), and androge ...

, a condition in which the adrenal glands, located above the kidneys, do not produce adequate amounts of steroid hormones **

Critical illness–related corticosteroid insufficiency Critical illness–related corticosteroid insufficiency is a form of adrenal insufficiency in critically ill patients who have blood corticosteroid levels which are inadequate for the severe stress response they experience. Combined with decrease ...

, a form of adrenal insufficiency in critically ill patients whose blood corticosteroid levels are inadequate for the stress response they experience

Nervous system

* Accommodative insufficiency (AI), the inability of the eye to focus properly on an object * Convergence insufficiency, a sensory and neuromuscular anomaly of the binocular vision system, characterized by an inability of the eyes to approach each other, or sustain convergence

Other medical conditions

Exocrine pancreatic insufficiency Exocrine pancreatic insufficiency (EPI) is the inability to properly digest food due to a lack of digestive enzymes made by the pancreas. EPI is found in humans afflicted with cystic fibrosis and Shwachman–Diamond syndrome, and is common in ...

(EPI), the inability to properly digest food due to a lack of digestive enzymes made by the pancreas

Other uses

* Motion triggered contact insufficiency (MTCI), the effect of increased contact resistance occurring during or after mechanical stress or movement of an electrical contact system {{disambig