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M | N |
O | P |
Q | R | S |
T | U |
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W-X-Y-Z
ulcer,
ulceration a crater-like sore on the skin or mucous
membrane
ulnar
of or pertaining to the ulnar bone or the area around it
ultrasonic
sound frequencies in a range beyond human hearing (greater than
20,000 cycles per second).
ultrasonic
nebulizer device that uses a piezoelectric crystal,
vibrating at a high frequency, to convert electricity to sound
waves, creating standing waves in the liquid immediately above
the transducer, disrupting the liquid surface, and forming a
geyser of aerosolized droplets.
ultrasonic
transducer a mechanism that converts electrical
energy into sound waves by means of a piezoelectric crystal.
ultrasonography the diagnostic use of ultrasound to
provide visualization of internal organs and structures
ultrasound
sound waves that occur at frequency beyond that which humans can
normally discern (over 20,000 vibrations per second)
uncontrolled refers to arrhythmias such as atrial
flutter and atrial fibrillation that are untreated and,
consequently, have rapid ventricular rates.
underlying
rhythm the basic rhythm upon which certain
arrhythmias are superimposed, such as sinus arrest and
sinoatrial (SA) exit block, AV blocks, pacemaker rhythm, and
premature atrial, junctional, and ventricular contractions.
underwater
jet humidifier a device that adds water vapor to a
carrier gas by injecting a high-velocity gas stream below the
surface of a water reservoir, causing a large amount of small
bubbles to form and rise to the water surface.
unifocal
pertains to a single ectopic pacemaker.
unfractionated heparin an anticoagulant.
unifocal
PVC's PVC's that originate in the same ventricular
ectopic pacemaker site, usually appearing identical (i.e.,
uniform).
uniform
PVC's PVC's having the same appearance and
configuration, presumably arising from the same ventricular
ectopic pacemaker site (i.e., unifocal).
unilateral
renal agenesis failure of development of one of the
kidneys.
unipolar
chest ("V") leads leads V1 to V6.
unipolar
limb leads leads aVR, aVL, and aVF.
United
States Pharmacopeia (USP) not-for-profit private
organization founded to develop officially recognized quality
standards for drugs, including medical gases.
units of
pulmonary dose toxic (UPDT) factor used to determine
when a patient may be in trouble from oxygen toxicity, and to
calculate the dose of oxygen when treatment tables are
intermixed while treating a large number of patients in a
multiplace hyperbaric chamber.
unmeasured
anions anionic proteins and other substances in serum
that are not measured in routine serum electrolyte
determinations but whose presence can be suspected by
calculating the anion gap.
unmonitored
cardiac arrest cardiac arrest that is witnessed by
the resuscitation team or that has occurred before the arrival
of the team and the patient is not being monitored.
unperfused
lacking blood flow
unsaturated
fatty acid naturally occurring fatty acid that has
one or more double carbon-carbon bonds in its hydrocarbon chain
because not all of the chain carbon atoms are saturated with
hydrogen atoms.
unsynchronized shock a direct-current (DC) shock not
synchronized with the QRS complex, used to treat the following:
-
Ventricular tachycardia,
polymorphic, with prolonged QT interval (with pulse)
-
Torsade de pointes (with pulse)
-
Pulseless ventricular tachycardia
-
Ventricular fibrillation
upper case
letters upper case letters, such as Q, R, S, are used
to designate large deflections of the ECG.
upper
pressure limit the maximum amount of pressure allowed
to be delivered by a ventilator without causing an alarm.
upstream
a relative reference to a point closer to the source in a stream
of flowing fluid
uremia
toxic condition of excessive waste products, protein, and
nitrogen in the blood caused by renal insufficiency
urinalysis
a physical, microscopic, or chemical examination of urine
urticaria
a pruritic skin eruption characterized by transient wheals of
varying shapes and sizes with well-defined erythematous margins
and pale centers
USN
abbreviation for ultrasonic nebulizer
USP
abbreviation for the United States Pharmacopeia, an officially
recognized compendium of drug uses, strengths, and purity
standards
uteroplacental insufficiency a general term
describing any physiological or anatomical abnormality of the
placental system that impairs normal exchange across the
placenta and threatens the viability of the fetus
utilitarian
theory most common type of consequential theory;
looks for the best outcome, the one that is most useful.
uvulopalatopharyngoplasty (UVPPP) a surgical
procedure used in treating severe obstructive sleep apnea, which
involves shortening of the soft palate and removal of the uvula
and tonsils
U wave
the positive wave superimposed on or following the T wave.
Possibly represents the final phase of repolarization of the
ventricles.
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