Question
All of the following are causes for the below ECG picture, EXCEPT :
| A. |
Hypothyroidism
|
| B. |
Pleural effusion
|
| C. |
Previous massive MI
|
| D. |
Acute pulmonary embolism
|
Show Answer
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Correct Answer � D
Explanation
|
|
Ans.D
· Above ECG depicts low voltage QRS complexes.
· The QRS is said to be low voltage when:
The amplitudes of all the QRS complexes in the limb leads are < 5 mm; or
The amplitudes of all the QRS complexes in the precordial leads are < 10 mm
·Mechanisms
Low voltage is produced by :
-The “damping” effect of increased layers of fluid, fat, or air between the heart and the recording electrode.
-Loss of viable myocardium.
-Diffuse infiltration or myxoedematous involvement of the heart.
Causes
Myxoedema/ Hypothyroidism
Infiltrative myocardial diseases — i.e.restrictive cardiomyopathy due to amyloidosis, sarcoidosis, hemochromatosis, Constrictive Pericarditis, Scleroderma
Loss of viable myocardium: Previous massive MI; End-stage dilated cardiomyopathy
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