MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Negative-Negative
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Positive-Positive
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Positive negative
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Negative-Positive
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undetermined-indeterminate
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Detailed explanation-1: -Therefore, if leads I and aVF are both positive, then the axis falls within the normal axis range. If lead I is positive and lead aVF is negative, then there is LAD. If lead I is negative and lead aVF is positive, then there is RAD.
Detailed explanation-2: -Left Axis Deviation If the QRS is upright in lead I (positive) and downward in lead aVF (negative), then the axis is between 0 and-90 degrees.
Detailed explanation-3: -The most efficient way to estimate axis is to look at LEAD I and LEAD aVF. A positive QRS in Lead I puts the axis in roughly the same direction as lead I. A positive QRS in Lead aVF similarly aligns the axis with lead aVF. Combining both coloured areas – the quadrant of overlap determines the axis.