The pain-free STEMI

STEMI often presents without chest pain, especially in older adults, women, and patients with diabetes. In adults over 85, roughly 40% to 45% of STEMIs are pain-free, and delayed ECGs and reperfusion help explain the higher mortality in this underrecognized ACS group.

Pain-Free STEMI Recognition

• Misleading symptom labels: Calling ischemic symptoms “atypical” obscures risk, because older adults commonly present with dyspnea, syncope, weakness, or abdominal complaints rather than the textbook substernal pain story.
• High-risk older adults: Adults over 85 have STEMI without chest pain in about 40% to 45% of cases, making absence of pain a dangerous reason to down-rank ACS.
• Why pain is absent: Neuropathy, impaired pain perception, ischemic preconditioning, collateral flow, and underlying lung disease can shift MI presentation toward dyspnea or nonspecific symptoms instead of chest discomfort.
• Alternative ischemic symptoms: Dyspnea, diaphoresis, nausea or vomiting, syncope, altered mental status, and generalized weakness can all be the first clue to occlusive MI. We get into the bedside pattern recognition in the episode.
• Age-based ECG triggers: There are validated age-based criteria for obtaining an immediate 12-lead ECG when chest pain is absent, linking symptoms like dyspnea, syncope, AMS, and abdominal pain to STEMI screening. We walk through the age cutoffs in the chapter.

Consequences of Missed ACS

• Delayed diagnostic workup: Patients without chest pain wait longer for ECGs and ACS evaluation than patients with chest pain, even though the nonpain presentation carries higher mortality.
• Less definitive reperfusion: Older patients presenting without chest pain are almost half as likely to undergo PCI, a treatment gap that likely contributes to worse outcomes.
• Prehospital ECG disparity: Pain-free STEMI is less likely to trigger a prehospital 12-lead, removing one of the fastest pathways to cath-lab activation and timely reperfusion.
• Medication treatment gap: Patients without chest pain are also less likely to receive aspirin, a statin, or a beta-blocker, showing how symptom framing changes downstream care.
• Older adults may benefit more: Aggressive early treatment may help older patients at least as much as younger patients, an important reminder not to let age or absent pain blunt reperfusion urgency.

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