STEMI Flashcards
Which are the inferior leads?
2, 3, AVF
Which are the septal leads?
V1 and V2
Which are the anterior leads?
V3 and V4
Which are the lateral leads?
1, AVL, V5 and V6
What is the ECG criteria for a STEMI?
signs and symptoms consistent with an MI
ST elevation >1mm in anatomically contiguous limb leads
ST elevation >2mm in anatomically contiguous precordial leads
What causes ST segment depression?
During ischaemia the affected cells become electrically more negative than the unaffected surrounding tissue.
What causes hyper acute (tall peaked) T waves?
Prolonged ventricular repolarisation. Which can be caused by ischaemia.
What can cause inverted T waves?
Repolarisation along an abnormal pathway.
What causes ST segment elevation?
The injured zone does not repolarise properly causing it to remain more positive than the surrounding tissues.
What do pathological Q waves represent?
myocardial infarction/death.
What do normal Q waves represent?
depolarisaiton of the interventricular septum.
What are reciprocal changes?
Opposite changes in limb leads which strengthen the hypothesis that someone is experiencing a STEMI
Anterior depression = Posterior elevation
Lateral depression = Inferior elevation
and vice versa
What are dynamic changes?
Changes in the morphology or the QRS, ST segment or T wave on serial ECGS.
What is the 10 steps by which we analyse 12-Lead ECGs?
Regularity Rate P-wave PRI QRS ST-segment T waves Axis Hypertrophy Interpretation
