The QRS complex may show a low voltage in a number of conditions.
(1) multiple myocardial infarctions
(2) severe post-myocardial infarcton dysynergy
(2) cardiac amyloidosis or other infiltrative cardiomyopathies
(4) reduced cardiac output (from hypovolemia, hemorrhage, etc).
(5) possibly increased hematocrit
(6) change in cardiac position
• An increased hematocrit indicates polycythemia which can occur in COPD.
(1) pericardial effusion
(3) thickening of the pericardium
• The low voltage QRS in hypothyroidism is usually due to a pericardial effusion but the effect on myocytes may contribute.
(1) peripheral edema
(2) chronic obstructive pulmonary disease (COPD)
(5) pleural effusion
(6) subcutaneous emphysema
(8) pulmonary edema
It can also occur in patients who are otherwise normal (idiopathic).
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