Final answer:
Left Axis Deviation (LAD) is an abnormality in the electrical conduction system of the heart that can be detected through an electrocardiogram (ECG). It refers to the deviation of the vector of depolarization to the left side of the heart and may indicate potential abnormalities or structural changes. Left Axis Deviation can be determined by observing specific criteria on ECG, such as angle of deviation, presence of ST shifts, and measurements of R or S waves in different leads.
Step-by-step explanation:
Left Axis Deviation (LAD) refers to an abnormality in the electrical conduction system of the heart, specifically in the direction of depolarization. It is detected through an electrocardiogram (ECG) which measures the voltage changes in different leads placed on the patient. In LAD, the vector of depolarization deviates to the left side of the heart, indicating a potential abnormality or structural changes.
Left Axis Deviation can be determined by observing various criteria, such as the angle of deviation (more negative than -15º), presence of ST shifts, and certain measurements of R or S waves in different leads. In certain cases, left ventricular hypertrophy (LVH) may be associated with LAD. ECG is an important diagnostic tool to detect and evaluate heart conditions, and a left axis deviation can provide insights into the electrical activity of the heart.