Management of Demand Ischemia NSTEMI

Initial Management Approach

The American College of Cardiology recommends administering nitroglycerin for ongoing ischemic symptoms to reduce myocardial oxygen demand by decreasing preload and afterload while enhancing myocardial oxygen delivery through coronary vasodilation 1, 2
The American College of Cardiology suggests that beta-blockers should be administered to reduce heart rate, blood pressure, and myocardial contractility, thereby decreasing myocardial oxygen demand 1, 2
Supplemental oxygen should be administered to patients with arterial oxygen saturation <90% to improve myocardial oxygen delivery 2, 4
Contraindications to nitrates include systolic blood pressure <90 mmHg or ≥30 mmHg below baseline, severe bradycardia (<50 bpm), tachycardia (>100 bpm) without heart failure, right ventricular infarction, or recent use of phosphodiesterase inhibitors for erectile dysfunction 2, 3

Aspirin (162-325 mg initially, then 75-162 mg daily) should be administered to all patients without contraindications, as recommended by the American College of Cardiology 5
Anticoagulation with low molecular weight heparin, unfractionated heparin, or fondaparinux should be initiated based on patient risk factors and planned management strategy, according to the American College of Cardiology 5

The American College of Cardiology recommends assessing hemodynamic stability, ongoing ischemia, and risk factors for adverse outcomes to determine management approach 1
For patients with ongoing ischemia refractory to initial medical therapy or hemodynamic instability, an early invasive strategy with cardiac catheterization is recommended by the American College of Cardiology 1, 6
Intra-aortic balloon pump counterpulsation may be reasonable for severe ischemia that continues or recurs frequently despite intensive medical therapy, as suggested by the American College of Cardiology 2

The American College of Cardiology recommends identifying and treating the specific factor causing oxygen supply-demand mismatch, including controlling tachyarrhythmias with appropriate rate-controlling medications 2
The American College of Cardiology suggests treating hypertension with appropriate antihypertensive agents 2
Addressing hypoxemia with supplemental oxygen and treatment of underlying respiratory conditions is recommended by the American College of Cardiology 2

The American Heart Association recommends continuing medications required to control ischemia after hospital discharge 7
Providing sublingual or spray nitroglycerin with clear instructions on its use is recommended by the American Heart Association 7
Educating patients about symptoms of worsening myocardial ischemia and when to seek emergency care is suggested by the American Heart Association 7

The American College of Cardiology recommends avoiding NSAIDs (except for aspirin) during hospitalization due to increased risks of mortality, reinfarction, hypertension, heart failure, and myocardial rupture 2
Immediate-release dihydropyridine calcium channel blockers should not be administered without adequate beta-blockade, as warned by the American College of Cardiology 2
Intravenous ACE inhibitors should be avoided within the first 24 hours due to increased risk of hypotension, according to the American College of Cardiology 2
Patients who have received nitrates must not take PDE5 inhibitors (sildenafil within 24 hours, tadalafil within 48 hours) due to potentially dangerous hypotensive effects, as cautioned by the American College of Cardiology 3