Potassium levels above 8.5 mmol/L are associated with which ECG finding?

Prepare for the SNHD Paramedic Protocols Test. Utilize flashcards and multiple choice questions, with hints and explanations for each query. Ace your exam comfortably!

Multiple Choice

Potassium levels above 8.5 mmol/L are associated with which ECG finding?

Explanation:
High potassium disrupts cardiac conduction in a progressive way. As extracellular potassium rises, the cells’ resting membrane potential becomes less negative, which first shows up as tall, peaked T waves. With further elevation, conduction slows more, leading to PR prolongation and loss of P waves. The QRS complex then widens, and at potassium levels around 8.5 mmol/L or higher, the QRS and T waves can merge into a sine-wave pattern. This sine-wave appearance is the hallmark of severe hyperkalemia and indicates a high risk for life‑threatening arrhythmias, making it the best answer for this scenario.

High potassium disrupts cardiac conduction in a progressive way. As extracellular potassium rises, the cells’ resting membrane potential becomes less negative, which first shows up as tall, peaked T waves. With further elevation, conduction slows more, leading to PR prolongation and loss of P waves. The QRS complex then widens, and at potassium levels around 8.5 mmol/L or higher, the QRS and T waves can merge into a sine-wave pattern. This sine-wave appearance is the hallmark of severe hyperkalemia and indicates a high risk for life‑threatening arrhythmias, making it the best answer for this scenario.

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