Final answer:
Immediate invasive treatment of non-ST elevation ACS may be indicated in cases of ongoing chest pain or high-risk features such as ischemia on ECG or hemodynamic instability.
Step-by-step explanation:
Non-ST elevation acute coronary syndrome (ACS) refers to a type of heart attack where the ST segment on the electrocardiogram (ECG) is not elevated. In cases of non-ST elevation ACS, immediate invasive treatment is indicated in certain situations.
One indication for immediate invasive treatment is if the patient is experiencing ongoing chest pain or other symptoms of unstable angina. This suggests that the coronary artery is partially blocked, and immediate intervention is required to restore blood flow to the heart muscle.
Another indication for immediate invasive treatment is if the patient is showing signs of high-risk features, such as significant ischemia on ECG, elevated levels of cardiac enzymes (such as troponin), or evidence of hemodynamic instability. In these cases, urgent intervention, such as coronary angiography and possible percutaneous coronary intervention (PCI), may be necessary.