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W-X-Y-Z
QRS axis
the single large vector representing the mean (or average) of
all the ventricular vectors.
QRS complex
normally, the wave following the P wave, consisting of the Q, R,
and S waves, and representing ventricular depolarization. May
be normal (narrow), 0.10 second or less, or abnormal (wide),
greater than 0.10 second.
qRS pattern
the QRS pattern present in leads V5-V6 typical of right bundle
branch block with an intact interventricular septum. An example
of a QRS complex with a "terminal S" wave.
QRS-ST-T
pattern refers to the abnormally wide, "sine-wave"
appearing QRS-ST-T complex that occurs in hyperkalemia.
QSR pattern
the QRS pattern present in leads V1-V2 typical of right bundle
branch block with a damaged interventricular septum.
QS wave
a QRS complex that consists entirely of a single, large negative
deflection.
QTc
see Corrected QT interval (QTc).
QT interval
the section of the ECG between the onset of the QRS complex and
the end of the T wave, representing ventricular depolarization
and repolarization.
quadrants
refers to the four quadrants of the hexaxial reference
figure-quadrants I, II, III, and IV.
quadrigeminy a series of groups of four beats,
usually consisting of three normally conducted QRS complexes
followed by a premature contraction that may be atrial,
junctional, or ventricular in origin (i.e., atrial quadrigeminy,
junctional quadrigeminy, ventricular quadrigeminy).
quadriplegia paralysis of the arms, legs, and trunk
of the body below the level of an associated injury to the
spinal cord, usually caused by spinal cord injury.
quick-connect outlet a device that allows rapid
connection and disconnection of compressed gas appliances to
highpressure gas delivery systems.
quick
reliever medication any of a group of primarily
short-acting agonists used to combat acute exacerbations of
bronchoconstriction or provide quick, complete resolution of
airflow obstruction and its accompanying symptoms of cough,
wheezing, and chest tightness; includes short-acting β2-agonist
and anticholinergics.
quinidine
sulfate an antiarrhythmic used to treat premature
atrial and junctional contractions.
quinidine
toxicity excessive administration of quinidine,
manifested electrocardiographically by wide, often notched P
waves; wide QRS complexes; low, wide T waves; U waves; prolonged
PR intervals; depressed ST segments; and prolonged QT
intervals.
Q wave
the first negative deflection of the QRS complex not preceded by
an R wave.
Q wave
myocardial infarction (MI) a myocardial infarction in
which abnormal Q waves are present in the ECG. In the majority
of the Q wave MI's a transmural myocardial infarction is
present; in the rest, the infarction involves only the sub
endocardium or mid portion of the myocardium.
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