ECGs

A 36-year-old man presents with acute onset of palpitations. He has no known history of heart disease. What is the origin of the tachyarrhythmia?

An 88-year-old man on digoxin presents to his cardiologist for routine follow-up. He is complaining of occasional palpitations and shortness of breath, and an ECG is obtained.

A 68-year-old woman presents to the ED with fatigue, breathlessness with minimal exertion, and muscle aches. She denies angina.

A 55-year-old woman presents with palpitations and breathlessness. What's your interpretation?

A 48-year-old woman with severe asthma is admitted to the hospital with palpitations. She is initially thought to have atrial fibrillation and is treated with attempts at rate control.

A 22-year-old man with no previous cardiac history, but with a history of a seizure disorder for the past 4 years, presents to the emergency department after an unwitnessed syncopal episode. He is admitted to the hospital and placed on telemetry.

The patient was complaining of chest pain and dyspnea in the minutes preceding the ECG and became acutely unresponsive and pulseless while the ECG was being obtained.

65-year-old man with known coronary disease presents with lightheadedness and palpitations. What is the rhythm abnormality?

A 63-year-old woman presents with the acute onset of chest discomfort.

57-year-old man presents to the emergency department with a several-hour history of substernal chest burning radiating to his throat and left arm associated with diaphoresis and nausea.