Learn ECGs Fast | JMD Medical Ed on Instagram: "Middle-aged man. Chest pain tearing to the jaw. BP dropping. Monitor beeping like a countdown. The ECG prints — and everyone says: “Inferior STEMI.” But this one’s clever. This one’s hiding something. Inferior ST elevation? Check. Reciprocal depression in aVL? Check. You think you’ve solved it. But look again at lead II. That little notch deforming the T wave? That’s not noise. That’s a P wave that never made it through. Welcome to Mobitz Type I AV