Which ECG lead changes occur with inferior MI?
Which ECG lead changes occur with inferior MI?
The ECG findings of an acute inferior myocardial infarction include the following: ST segment elevation in the inferior leads (II, III and aVF) Reciprocal ST segment depression in the lateral and/or high lateral leads (I, aVL, V5 and V6)
What are the inferior leads of the heart?
The arrangement of the leads produces the following anatomical relationships: leads II, III, and aVF view the inferior surface of the heart; leads V1 to V4 view the anterior surface; leads I, aVL, V5, and V6 view the lateral surface; and leads V1 and aVR look through the right atrium directly into the cavity of the …
Which leads should you check for an inferior wall infarction?
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. The addition of right-sided ECGs leads, especially lead V4r, will aid in that diagnosis.
What areas affect inferior myocardial infarction?
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.
Which leads show anterior MI?
The ECG findings of an acute anterior myocardial infarction wall include: ST segment elevation in the anterior leads (V3 and V4) at the J point and sometimes in the septal or lateral leads, depending on the extent of the MI. This ST segment elevation is concave downward and frequently overwhelms the T wave.
Which leads show posterior wall MI?
The ECG findings of an acute posterior wall MI include the following: ST segment depression (not elevation) in the septal and anterior precordial leads (V1-V4). This occurs because these ECG leads will see the MI backwards; the leads are placed anteriorly, but the myocardial injury is posterior.
What does lead V1 represent?
The precordial, or chest leads, (V1,V2,V3,V4,V5 and V6) ‘observe’ the depolarization wave in the frontal plane. Example: V1 is close to the right ventricle and the right atrium. Signals in these areas of the heart have the largest signal in this lead. V6 is the closest to the lateral wall of the left ventricle.
What leads are reciprocal to inferior leads?
Acute inferior myocardial infarction is indicated by ST-segment elevation and broad upright T waves in leads II, III, and aVF. These changes are mirrored perfectly by reciprocal ST depression and T-wave inversion in leads I and aVL.
Which coronary artery is affected in inferior MI?
An inferior myocardial infarction results from occlusion of the right coronary artery (RCA). This can cause a ST elevation myocardial infarction or a non-ST segment elevation myocardial infarction.
What leads show right-sided MI?
Right-sided leads The most useful lead is V4R, which is obtained by placing the V4 electrode in the 5th right intercostal space in the mid-clavicular line. ST elevation in V4R has a sensitivity of 88%, specificity of 78% and diagnostic accuracy of 83% in the diagnosis of RV MI.
What are leads V1 V2 V3 V4 V5 and V6 known as?
The six limb leads are called lead I, II, III, aVL, aVR and aVF. The letter “a” stands for “augmented,” as these leads are calculated as a combination of leads I, II and III. The six precordial leads are called leads V1, V2, V3, V4, V5 and V6.