left axis deviation


Also found in: Acronyms.

left ax·is de·vi·a·tion

a mean electrical axis of the heart pointing to -30° or more negative. See: hexaxial reference system.

left axis deviation

Cardiology Any shift in the pattern of EKG leads; when seen with a counterclockwise loop abnormality in the frontal plane of a vectorcardiogram, LAD is typical of an ostium primum type atrioventricular canal defect.
Mentioned in ?
References in periodicals archive ?
In our study the ECG abnormalities were sinus tachycardia, T-wave inversion in inferior leads, left anterior hemiblock with left axis deviation and ventricular premature contraction.
* Pacemaker spikes are not always visible, but the morphology will usually show atypical LBBB with left axis deviation and RV apical pacing.
There is frequently a left axis deviation due to these changes.
In control group, there was no electrical deviation, but among IHD cases 10 cases showed left axis deviation.
Figure 3 shows a monitor strip during battery exchange with the patient's own rhythm (left axis deviation) followed by VVI stimulation by the newly connected pacemaker, showing an unusual right axis deviation.
Electrocardiogram (ECG) was suggestive of sinus tachycardia with left axis deviation. Two-dimensional (2D) transthoracic echocardiography demonstrated IVS posterior wall mismatch, right ventricular free wall hypokinesia, ejection fraction 49.7% and normal cardiac valve morphology.
Criteria for left anterior fascicular block as proposed by the World Health Organization/International Society and Federation of Cardiology (WHO/ISFC) task force are left axis deviation of the QRS in the frontal plane of -45[degrees] to -90[degrees], qR pattern in aVL, R peak time in aVL [greater than or equal to] 45 ms, and QRS duration <0.12s.
P wave axis greater than +70[degrees] thus usually reflects right axis deviation of the p wave, P wave axis less than +45[degrees] usually reflects left axis deviation.
(24) Slight left axis deviation (-30, and -15, respectively) of mean QRS axis was present in 14.3% cases.
Among Athletes 16% (8/50) subjects showed Left Axis deviation (LAD), 4% (2/50) showed Right Axis Deviation (RAD).