Microvoltations: Difference between revisions

Latest revision as of 22:29, 18 September 2007

Microvoltages. Note the normal amplitude of the p waves.

Another example of (extreme) microvoltages.

microvoltages: The QRS amplitute (i.e. the sum of the postive and negative parts) in the limb leads does not exceed 0.5 mV (5 mm) OR is no more than 1.0 mV (1 cm) in the chest leads.

Possibe causes of microvoltages:

Cardiomyopathy, especially infiltrative cardiomyopathy, such as in amyloidosis
Increased resistance between the heart and the electrodes: pneumothorax, obesesity, pericardial fluid / tamponade, pleural effusion
Myocarditis / pericarditis
Heart tranplantation, especially during acute or chronic rejection
Wrong settings on the ECG apparatus (sensitivity should be at 10 mm/mV)

@@ Line 1: / Line 1: @@
-[[Image:microvoltages.jpg|thumb|Microvoltations. Note the normal amplitude of the p waves.]]
+[[Image:microvoltages.jpg|thumb|Microvoltages. Note the normal amplitude of the p waves.]]
-[[Image:microvoltages002.jpg|thumb|Another example of (extreme) microvoltations. ]]
+[[Image:microvoltages002.jpg|thumb|Another example of (extreme) microvoltages.]]
-;microvoltations: The QRS amplitute (i.e. the sum of the postive and negative parts) in the limb leads does not exceed 0.5 mV (5 mm) OR is no more than 1.0 mV (1 cm) in the chest leads.
+;microvoltages: The QRS amplitute (i.e. the sum of the postive and negative parts) in the limb leads does not exceed 0.5 mV (5 mm) OR is no more than 1.0 mV (1 cm) in the chest leads.
-Possibe causes of microvoltations:
+Possibe causes of microvoltages:
 * Cardiomyopathy, especially infiltrative cardiomyopathy, such as in [[w:Amyloidosis|amyloidosis]]
 * Increased resistance between the heart and the electrodes: pneumothorax, obesesity, pericardial fluid / tamponade, pleural effusion