axis deviation

axis deviation

n.

The deflection of the electrical axis of the heart to the right or left of its normal position. Also called axis shift.

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axis deviation,

an electrocardiogram trace in which the QRS axis of the heart in the frontal plane lies outside the usual range of -30 to 110 degrees. It represents an abnormal direction of ventricular depolarization.

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deviation [de″ve-a´shun]

1. a turning away from the regular standard or course.

2. in ophthalmology, strabismus.

3. in statistics, the difference between a sample value and the mean.

axis deviation an axis shift in the frontal plane, as seen on an electrocardiogram. There are three types: Left, from −30° to −90°; Right, from +90° to +180°; and Undetermined, which may be either extreme left or extreme right, from −90° to +180°.

conjugate deviation dysfunction of the ocular muscles causing the two eyes to diverge to the same side when at rest.

sexual deviation sexual behavior or fantasy outside that which is morally, biologically, or legally sanctioned, often specifically one of the paraphilias.

standard deviation (SD) the dispersion of a random variable; a measure of the amount by which each value deviates from the mean. It is equal to the square root of the variance. For data that have a normal distribution, about 68 per cent of the data points fall within (plus or minus) one standard deviation from the mean and about 95 per cent fall within (plus or minus) two standard deviations. Symbol σ.

ulnar deviation a hand deformity, seen in chronic rheumatoid arthritis and lupus erythematosus, in which swelling of the metacarpophalangeal joints causes the fingers to become displaced to the ulnar side. Called also ulnar drift. See illustration.

 Ulnar deviation (ulnar drift) of the metacarpophalangeal joint, a characteristic sign of rheumatoid arthritis. From Pedretti and Early, 2001.