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Difficult QT: Difference between revisions
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===General considerations=== | ===General considerations=== | ||
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* The QT interval should be measured in lead II, because the influence of a possible U-wave are smallest in this lead. If lead II is cannot be used for measurements, than leads V4 or V5 can be used alternatively. | * The QT interval should be measured in lead II, because the influence of a possible U-wave are smallest in this lead. If lead II is cannot be used for measurements, than leads V4 or V5 can be used alternatively. | ||
* Draw a line through the baseline. This is the horizontal line between the P wave and QRS complex. If PTa depression is present, the T - P segment is used alternatively. If there is baseline drifting, it can be difficult to determine the proper baseline and measurements will be less accurate. | * Draw a line through the baseline. This is the horizontal line between the P wave and QRS complex. If PTa depression is present, the T - P segment is used alternatively. If there is baseline drifting, it can be difficult to determine the proper baseline and measurements will be less accurate. | ||