Basics & Fundamentals
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Preexcitation Pitfalls (Part 3): Wide, Irregular, Fast…Avoid AV Nodal Blockers
A 53-year-old man presents with palpitations and lightheadedness. The following ECG is obtained on arrival and appears very rapid and irregular with changing QRS morphologies. He starts showing signs of…
Baltimore City EMS ECGs: Pitfalls and Mimics (Part 1)
A 68-year-old man is brought to the emergency department by EMS with acute chest discomfort. The following prehospital ECG was obtained and shows concave ST elevation across multiple leads. The…
Three More ECG Pitfalls That Punish Anchoring Bias
A 51-year-old man with lung cancer presents with shortness of breath and tachycardia. The arrival ECG shows an S1Q3 pattern and seems to support a familiar diagnosis that would normally…
Four ECG Pitfalls That Punish Anchoring Bias
A 43-year-old woman with sharp left-sided chest pain and minimal cardiac risk factors has an initial ECG that is not diagnostic for STEMI. She looks stable, but one feature on…
Reciprocal Depression in aVL: The Case for Serial ECGs
A 62-year-old man presents to the emergency department with acute chest pain associated with diaphoresis. He has cardiac risk factors including tobacco use. An initial 12-lead ECG is obtained on…
In the Era of High-Sensitivity Troponin, Does Unstable Angina Still Exist?
A 92-year-old man presents to the emergency department with gradually worsening dyspnea on exertion that has progressed to exertional chest “fullness”. He is asymptomatic on arrival with normal vitals. The…
Recent ECG Case Highlights from the University of Maryland (Part II)
A 67-year-old man arrives at the emergency department complaining of lightheadedness. The following ECG is obtained and shows a slow, regular rhythm around 40 beats per minute. The P waves…
AFib Overdiagnosis: Dangerous Pitfalls and Safer Reads
A patient presents to the emergency department with new-onset palpitations. He is hemodynamically stable but noted to have an irregular rhythm on arrival. The following ECG is obtained and automatically…
Not Your Usual STEMI: High Voltage and Narrow Q Waves
A 16-year-old male is referred to the emergency department from a primary care clinic with concern for STEMI. He has no known past medical history. At the clinic, he reported…
STEMI Diagnosis: Beyond the Millimeters
A 55-year-old man with PMHx of hyperlipidemia presents to the emergency department with vague chest discomfort. The following ECG is obtained:
Regularly Irregular Rhythms: Sorting Mobitz from PACs and Other Causes
A 52-year-old woman presents to the emergency department with weakness. The following ECG is obtained:
Grouped Beats: A Subtle AV Block Pitfall
An elderly patient is brought to the emergency department with acute stroke symptoms and the following routine 12-lead ECG is obtained during the patient’s stroke evaluation:
High-Grade AV Block: New Perspectives and Important Clarifications
A 51-year-old man presents to the emergency department via EMS with nausea, vomiting, weakness, severe bradycardia (HR in the 20s), and hypotension (BP 60s systolic). The following ECG is obtained…
Mobitz I or Mobitz II: How to tell the difference
A 79-year-old man is sent to a community hospital for evaluation of bradycardia discovered at his nursing facility. He is ultimately transferred to a tertiary care facility for consideration of…
Recent University of Maryland Medical Center Cases (Part I)
A 67-year-old man presents to the emergency department with chest pain and palpitations. The following ECG is obtained on arrival:
Optical Illusions and 12-Lead ECGs: How First Impressions Can Mislead
A 42-year-old woman presents to the emergency department with chest pain, shortness of breath, and palpitations. Her blood pressure and mental status are noted to be normal. The following ECG…
Unrecognized Killers in Emergency Electrocardiography
A 42-year-old man presents with fever, cough, shortness of breath, and vomiting. He appears toxic and dehydrated on arrival with suspected severe sepsis from multilobar pneumonia. He is later intubated…
2025 In-Training Exam Preparation (Part III/III)
A 47-year-old male presents to the emergency department with acute chest and back pain. The following ECG is obtained, and concerning for diffuse ST segment elevation:
T Wave Clues: Uncovering Concealed Conduction Blocks and Arrhythmias
A 58-year-old man presents to the emergency department after an episode of syncope. The following ECG is obtained on arrival and interpreted as “sinus bradycardia”:
Anterior T Wave Inversions: Benign Variant or Hidden Danger?
A 31-year-old woman presents with chest discomfort that is worse with twisting and lifting. She denies any associated vomiting or worsening pain with exertion. The following ECG is obtained on…
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