19: ECGs, MIs Flashcards
1
Q
Limb leads vs precordial leads: show the heart in which planes?
A
Limb leads: frontal/coronal plane
Precordial leads: horizontal plane
2
Q
What % of MIs are STEMIs?
A
30%
3
Q
Two populations in which STEMIs can be silent
A
Diabetics, older women
4
Q
Angina, NSTEMI, and STEMI
A
Angina: partial occlusion
NSTEM: more occlusion
STEMI: necrosis occurs
5
Q
Causes of MIs
A
Mostly atherosclerosis, but also vasospasms, vasculitis, dissection, and genetics
6
Q
What part of the ECG is affected by infarct vs injury vs ischemia
A
Infarct: Q wave
Injury: ST segment
Ischemia: T wave
7
Q
When is troponin detectable and at its peak after AMI?
A
1-4hrs after onset: detectable
10-24hrs: peak
8
Q
What can cause false positive troponin?
A
Renal failure
