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46 year old with chest pain develops a wide complex rhythm -- see many examples

Dr. Smith's ECG Blog

He reported a history of “Wolf-Parkinson-White” and “heart attack” but said neither had been treated. The receiving emergency physician consulted with interventional cardiology who stated there was no STEMI. Is there STEMI? These diagnoses were not found in his medical records nor even a baseline ECG. What is the rhythm?

STEMI 107
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A man in his 30s with cardiac arrest and STE on the post-ROSC ECG

Dr. Smith's ECG Blog

He reportedly told his family "I think I'm having a heart attack", then they immediately drove him to the ED, and he was able to ambulate into the triage area before he collapsed and became unresponsive. CPR was initiated immediately. There is also STD in V2-V4 (but maximal in V5-V6).

ACS 52
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A man in his 70s with chest pain

Dr. Smith's ECG Blog

He stated it was similar to prior heart attacks. ST depression maximal in V1-V4, in the context of ACS symptoms and unexplained by QRS abnormality or tachydysrhythmia, should be considered posterior OMI until proven otherwise. The pain was still ongoing at arrival. He also noted a bilateral "odd feeling" in his arms.