What is affected in an inferior MI?

What is affected in an inferior MI?

Inferior wall myocardial infarction (MI) occurs from a coronary artery occlusion with resultant decreased perfusion to that region of the myocardium. Unless there is timely treatment, this results in myocardial ischemia followed by infarction.

When should you suspect posterior MI?

ST elevation in the posterior leads of a posterior ECG (leads V7-V9). Suspicion for a posterior MI must remain high, especially if inferior ST segment elevation is also present. ST segment elevation in the inferior leads (II, III and aVF) if an inferior MI is also present.

What is posterior MI?

Posterior myocardial infarction occurs when the posterior coronary circulation becomes disrupted. The two main branches of the coronary circulation are the right coronary artery and the left main coronary artery.

Is inferior myocardial infarction serious?

Inferior myocardial infarctions have multiple potential complications and can be fatal.

How do you treat inferior myocardial infarction?

The traditional field treatment for an MI is aspirin and oxygen, with nitroglycerin and morphine for pain (often referred to as MONA). Some services now administer angiotensin converting enzyme (ACE) inhibitors, clopidogrel, and beta-blocking drugs as well.

What artery is involved in an inferior MI?

In most patients, the inferior myocardium is supplied by the right coronary artery.

How is posterior MI confirmed?

Posterior infarction is confirmed by the presence of ST elevation and Q waves in the posterior leads (V7-9).

What artery is blocked for posterior MI?

Anatomically, the location of injury of “true posterior MI” by magnetic resonance imaging actually involves portions of the lateral left ventricular wall and is typically caused by occlusion of a nondominant left circumflex artery.

How is posterior MI diagnosed?

Posterior infarction is diagnosed based on the presence of ST segment elevation >0.5mm in leads V7-9. Note that there is also some inferior STE in leads III and aVF (but no Q wave formation) suggesting early inferior involvement.

How is inferior MI treated?

How is inferior MI diagnosed?

The ECG findings of an acute inferior myocardial infarction include the following:

1. ST segment elevation in the inferior leads (II, III and aVF)
2. Reciprocal ST segment depression in the lateral and/or high lateral leads (I, aVL, V5 and V6)

What part of the heart is affected by an inferior MI?

While inferior wall MIs traditionally have a good prognosis, there are a few factors that may increase mortality. Approximately 40% of inferior wall infarctions also involve the right ventricle. Right ventricular infarctions are very pre-load dependent, and nitrates may precipitate a drop in blood pressure.

What causes inferior infarction?

How do you suspect posterior MI?

In patients presenting with ischaemic symptoms, horizontal ST depression in the anteroseptal leads (V1-3) should raise the suspicion of posterior MI. Posterior infarction is confirmed by the presence of ST elevation and Q waves in the posterior leads (V7-9).

How can you tell the difference between anterior and posterior STEMI?

Main ECG pointers for Posterior STEMI: Look for deep (>2mm) and horizontal ST-segment depression in the anterior leads and large anterior R-waves (bigger than the S-wave in V2). Posterior STEMI often occurs along with an inferior or lateral STEMI, but can also occur in isolation.

What leads are elevated in posterior MI?

What is inferior MI in ECG?

Inferior Wall ST Segment Elevation Myocardial Infarction (MI) ECG Review. An inferior wall MI — also known as IWMI, or inferior MI, or inferior ST segment elevation MI, or inferior STEMI — occurs when inferior myocardial tissue supplied by the right coronary artery, or RCA, is injured due to thrombosis of that vessel.

What is inferobasilar?

Inferobasilar or inferobasal describes the lower part of the heart, above the diaphragm, and towards the back of the body.

What is inferior wall myocardial infarction (MI)?

Inferior wall myocardial infarction (MI) occurs from a coronary artery occlusion with resultant decreased perfusion to that region of the myocardium. Unless there is timely treatment, this results in myocardial ischemia followed by infarction. In most patients, the inferior myocardium is supplied by the right coronary artery.

What is an inferobasilar fixed defect?

Inferobasilar or inferobasal describes the lower part of the heart, above the diaphragm, and towards the back of the body. A fixed defect is a term for an abnormality that shows up in an xray or scan, which persists when the patient is at rest, and which occurs without ischemia (restriction of blood flow to the area).

What is the prognosis of an inferior wall mi?

Approximately 40% of all MIs involve the inferior wall. Traditionally, inferior MIs have a better prognosis than those in other regions, such as the anterior wall of the heart. The mortality rate of an inferior wall MI is less than 10%.