A patient's electrocardiogram ST segment tracing is demonstrating deflections. The nurse realizes that this tracing is consistent with
1. atrial muscle injury.
2. ventricular muscle injury.
3. hypokalemia.
4. respiratory acidosis.
2
Rationale: The ST segment represents the completion of ventricular depolarization and the beginning of ventricular repolarization. The segment should be isoelectric, or consistent with the baseline. There should be no deflections present because positive and negative charges are balanced. Deflections in the ST segment usually indicate ventricular muscle injury. ST segment changes do not indicate atrial muscle injury, hypokalemia, or respiratory acidosis.
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