Category: U

  • Uteroplacental insufficiency

    Inadequate blood flow through the placental intervillous spaces to enable sufficient transmission of nutrients, oxygen, and fetal wastes. It may be caused by diminished maternal cardiac output due to anemia, heart disease, regional anesthesia, or supine hypotension; vasoconstriction due to chronic or pregnancy-related hypertension or uterine overstimulation; vasospasm due to pregnancy-induced hypertension; vascular sclerosis due…

  • Ulcerative inflammation

    The formation of an ulcer over an area of inflammation.  

  • Uric acid infarct

    An infarct in the kidney caused by obstruction of the renal tubules by uric acid crystals.  

  • Urge urinary incontinence

    Involuntary passage of urine occurring soon after a strong sense of urgency to void. Drugs that inhibit the detrusor muscle of the bladder, such as oxybutynin, can be used as treatment.  

  • Unilateral inattention

    An inability to recognize stimulation provided to the side of the body or the visual field damaged by a stroke in the nondominant hemisphere of the brain. Sometimes called visual inattention or visual unilateral inattention.  

  • Urinary ileostomy

    The surgical formation of an opening from the urinary tract to an isolated segment of the ileum, most often by implanting the ureters into an ileal segment fashioned into a continent ileal conduit (e.g., Kock pouch).  

  • Unsaturated hydrocarbon

    A hydrocarbon in which carbon atoms share two or three pairs of electrons.  

  • Uterine horn

    Either of the two upper corners of the uterus into which the uterine tubes enter.  

  • Uterine hernia

    The presence of the uterus in the hernial sac.  

  • Unilateral hermaphroditism

    Hermaphroditism in which an ovary and a testis or an ovotestis is present on one side and either an ovary or a testis is present on the other side.