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==Lead reversals== | ==Lead reversals== | ||
Lead switches are a common mistake when ECGs are made and can lead to wrong diagnoses. Common mistakes are: | Lead switches are a common mistake when ECGs are made and can lead to wrong diagnoses. Common mistakes are: | ||
* | * '''Left - right arm reversals'''. This leads to a negative complex in lead I with also a negative P wave in lead I. It is one of the most common causes of right axis deviation on the ECG! | ||
* Arm - foot switches lead to a very small or 'far field' signal in leads II or III. | * '''Arm - foot switches''' lead to a very small or 'far field' signal in leads II or III. | ||
* Chest lead reversal lead to inappropiate R wave progression (increase - decrease - increase) and are often easily recognized. | * '''Chest lead reversal''' lead to inappropiate R wave progression (increase - decrease - increase) and are often easily recognized. | ||
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<gallery> | <gallery> | ||