Examining Left Axis Deviation

Abstract

Axis deviation indicates possible presence of various conditions. It also affects the QRS and T morphologies. The limits of axis deviations are as such arbitrary and the approximate degree of axis itself can be easily determined. Various conditions often shift the QRS axis without fulfilling the defined limits of deviations in the initial stage. The associations with various conditions may be missed if such partial shift of the axis is disregarded. Isolated left axis deviation is relatively common in the general population and left anterior fascicular conduction delay is the most common cause of such isolated leftward shift of axis. Vulnerability of left anterior fascicle to interruption makes it likely to be affected by both atherosclerosis and fibrodegeneration. Glucose intolerance may increase the risk of both atherosclerosis and fibrodegeneration. The association of glucose intolerance with leftward shift of axis has been increasingly noticed. Research studies to get further evidences are required; however, utilizing the already available evidences to protect the susceptible population is equally essential. Documenting the approximate degree itself of the axis is the bottom line to study the association with the levels of various possible risk factors like glycated hemoglobin.