MI Flashcards
High risk non-ST-Elevation myocardial infarction (non-STEMI) characteristics (3)
- ST depression > 0.5mm(0.05mV)
- Dynamic T-wave inversion with pain or discomfort
- Nonpersistant or transient ST elevation > 0.5mm (0.05mV) for longer than 20min.
Normal or nondiagnostic changes in ST segment or T wave characteristics
(2)
- normal ECG
* ST deviation of
II, III, aVf
Inferior Wall (most common)
V1, V2
Septal Wall
V3, V4
Anterior Wall (most lethal)
I, aVL, V5, V6
Lateral Wall
STEMI is characterized by what?
2
•Elevation > 1mm(0.1mV) in two or more limb leads or two contiguous
chest leads
•Also w/ new LBBB
II, III, aVf
What artery involved?
Right
V1, V2
What artery involved?
Left
I, aVL, V5, V6
What Artery involved?
Left
V4R-V6R
Right ventricle
V4R-V6R
What artery involved?
Right
What do deep symmetrically inverted T waves a sign of?
Ischemia
In an acute STEMI reciprocal changes may be seen where?
Between leads that face acute injury
Leads that face lateral boundary of the injury(between ischemic and healthy tissue)
Leads that face the injury often show what?
ST elevation
Leads that face the boundary often show what?
ST depression
How can the extent of infarction be gauged?
- How many leads show ST elevation
* Degree of elevation
What are some “Infarct Imposters” that can cause ST changes
Left ventricular hyperthrophy
Ventricular rhythms
Pericarditis
