An athlete uses a potassium-rich salt substitute heavily and develops palpitations and an ECG showing peaked T waves. Which diagnosis and causative behavior is most consistent with this presentation?

• A. A potassium-independent cardiac conduction disorder that is unrelated to dietary intake and does not require checking serum electrolytes or changing the athlete's supplement habits.
• B. Hyperkalemia caused by excessive intake of potassium from the salt substitute; peaked T waves are a classic ECG sign and intake should be stopped and potassium levels checked promptly.
• C. Hypokalemia from sweating during exercise; peaked T waves indicate low potassium and the athlete should drink more plain water to restore electrolyte balance.
• D. Hypernatremia induced by the salt substitute because potassium salts always contain excess sodium leading to high sodium levels and ECG peaked T waves directly indicate sodium toxicity.

Answer: (B)