Insufficiency may refer to:

Medical conditions

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Circulatory system

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  • 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, insufficient blood flow through the arteries typically caused by atherosclerosis
  • Chronic venous insufficiency or CVI is a medical condition where the leg veins cannot pump enough oxygen-poor blood back to the heart
  • 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
  • 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

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Nervous system

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  • 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

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Other uses

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