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Insufficiency is used in describing many medical conditions and may refer to:

  • Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object
  • Adrenal insufficiency, a condition in which the adrenal glands, located above the kidneys, do not produce adequate amounts of steroid hormones
  • Aortic insufficiency (AI), also known as aortic regurgitation (AR), is the leaking of the aortic valve of the heart that causes blood to flow in the reverse direction during ventricular diastole, from the aorta into the left ventricle
  • Arterial insufficiency is a lack of enough blood flow through the arteries typically caused by atherosclerosis
  • Arterial insufficiency ulcer (also known as "Ischemic ulcers") are mostly localed 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
  • 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
  • Critical illness–related corticosteroid insufficiency, a form of adrenal insufficiency in critically ill patients who have blood corticosteroid levels which are inadequate for the severe stress response they experience
  • Exocrine pancreatic insufficiency (EPI) is the inability to properly digest food due to a lack of digestive enzymes made by the pancreas
  • Placental insufficiency, insufficient blood flow to the placenta during pregnancy
  • Pulmonary valve insufficiency (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
  • Uteroplacental insufficiency, insufficient blood flow to the placenta during pregnancy
  • Venous insufficiency ulceration, as well as stasis dermatitis, is a skin condition that results from increased pressure in the venous system of the lower leg
  • Vertebrobasilar insufficiency (VBI), or vertebral basilar ischemia, refers to a temporary set of symptoms due to decreased blood flow in the posterior circulation of the brain

Other non-medical uses of the word include:

  • Motion triggered contact insufficiency (MTCI) describes the effect of increased contact resistance occurring during or after mechanical stress or movement of an electrical contact system, sometimes appearing after a considerable amount of use, independent of electric current, difficult to detect due to temporary nature
  • The Complete Guide to Insufficiency, the debut album by David Thomas Broughton, released in 2005