You are called to a scene where a 70-year-old male is experiencing severe dehydration. The patient's blood test shows an elevated potassium level of 7.2 mEq/L. Which ECG finding is most likely associated with this electrolyte imbalance?
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✓ Correct answer: C. Widened QRS complexIn cases of hyperkalemia, where serum potassium levels exceed 7.0 mEq/L, ECG changes such as a widened QRS complex and prolonged PR interval are common. These changes reflect impaired cardiac repolarization caused by high potassium levels. Peaked T waves often occur at lower potassium levels, typically between 5.5 mEq/L - 6.5 mEq/L.
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