Medicine
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Non-ST Elevation MI

Non-ST Elevation MI

Pathology

Part of the acute coronary syndrome spectrum of conditions that result from acute myocardial ischaemia

Aetiology

Atheromatous plaque rupture and partial luminal obstruction by thrombus

Signs

Levine’s sign, diaphoresis, dyspnoea

Symptoms

Central chest heaviness or tightness, heavy arms, nausea, and breathlessness. Beware ‘atypical’ presentations- symptoms may occur with increasing frequency or severity, at rest or be new onset and severe

Investigations

Bloods: FBC, U&E, lipid profile, blood glucose, serial troponin (presence indicates NSTEMI while absence indicates unstable angina).

ECG: ST depression or T-wave inversion

Risk stratification: TIMI or Grace Risk Scores

Treatment

Analgesia and oxygen as required

Nitrates

β-receptor antagonists

Aspirin, clopidogrel or prasugrel

Low molecular weight heparin

Coronary angioplasty or surgery

Secondary prevention (including a statin and ACE inhibitor)

Prognosis

Hospital mortality in NSTEMI is 3-5%, and 13% at six months Unstable angina/NSTEMI associated with high incidence of late events.

Arrhythmias, LV failure, sudden death, RV failure, pericarditis, systemic embolism of mural thrombus, pulmonary embolism, mitral regurgitation, Dressler’s syndrome, depression and anxiety

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