Date Published
September 25, 2025
Updated For
ALS PCS Version 5.4
#SWORBHPTips
Cardiac Thrombosis
- Refers to a blockage of a coronary artery (or arteries) by a blood clot.
- This blockage leads to heart muscle damage (Acute MI), which can result in lethal arrhythmias and/or a decreased cardiac output causing cardiac arrest
Why Leave Early?
- Time is heart muscle. The quicker that the thrombosis is treated, the better the chance of survival
- Thrombosis can be treated in-hospital via:
- Thrombolytic (TNK)
- PCI at cath lab facilities*
- Thrombosis can be treated in-hospital via:
*Each cath lab has its own dynamic capabilities and may or may not be able to accept a patient in cardiac arrest. Follow the STEMI Bypass Guidelines and local service-hospital policies.
When to Leave Early?
- The thrombosis causing arrest that we are searching for is STEMI
- Requires clinical symptoms consistent with cardiac ischmia
- Requires a STEMI ECG PRIOR to cardiac arrest
- Why do we need to see STEMI prior to arrest?
- Ischemia from cardiac arrest can cause STEMI due to the ischemic injury from lack of sufficient bloodflow
- We want to ensure we are stopping our resuscitation to transport a patient early ONLY IF the cause is a blockage of the coronary arteries (prehospital prearrest STEMI tells us about concern for blockage)
- Ischemia from cardiac arrest can cause STEMI due to the ischemic injury from lack of sufficient bloodflow
In Summary
- Cardiac thrombosis refers to a blood clot blocking coronary arteries – causing MI. This is detected in the prehospital realm by pre-arrest STEMI positive ECG
- Consider very early transport for patients with a STEMI positive 12-Lead ECG (along with clinical symptoms of MI) prior to cardiac arrest
- Otherwise, treat per the Medical Cardiac Arrest medical directive
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