At potassium 6.5-7.5 mmol/L, which ECG change is expected?

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Multiple Choice

At potassium 6.5-7.5 mmol/L, which ECG change is expected?

Explanation:
When potassium is this high, the heart’s conduction becomes progressively suppressed, and atrial activity is affected first in a way that blunts or eliminates the P waves. So at potassium 6.5–7.5 mmol/L, loss of P waves reflects significant atrial conduction slowing and is a characteristic change for this stage of hyperkalemia. You may still see tall tented T waves, but the defining change at this level is the disappearance of P waves. Widening of the QRS and sine wave patterns occur as potassium rises even higher, indicating more severe electrical instability.

When potassium is this high, the heart’s conduction becomes progressively suppressed, and atrial activity is affected first in a way that blunts or eliminates the P waves. So at potassium 6.5–7.5 mmol/L, loss of P waves reflects significant atrial conduction slowing and is a characteristic change for this stage of hyperkalemia. You may still see tall tented T waves, but the defining change at this level is the disappearance of P waves. Widening of the QRS and sine wave patterns occur as potassium rises even higher, indicating more severe electrical instability.

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