Myocardial ischemia and infarction Flashcards
What is the terrible triad
Ischemia
Injury
Infarction
What is ischemia? How does it appear on an ECG
Poor blood supply and hypoxia
Inverted T-waves
Is ischemia reversible
yes
How quickly does ischemia occur in an MI
within seconds of onset
Injury may appear which 2 ways on an ECG
Elevated ST Segment
Depressed ST segment
How does infarction appear on an ECG
Abnormal Q waves + QRS Complexes
Can also have increased R waves
Is infarction reversible?
No
Infarction occurs ____ after onset
2 hours after
Is injury reversible
yes
When does injury occur
20-40 mins
Bradycardia = ___BPM
<60bpm
Tachycardia = ___ BPM
> 100 bpm
What causes a 1st degree AV block
Prolonged conduction in AV node (PR interval >0.02s)
What does the P-wave look like in a 1st degree AV block
normal
how many types of 2nd degree AV block are there? what are they?
2
MOBITZ Type 1 (Wenckeback): Block occurs at AV node and is transient
MOBITZ Type 2: Block occurs at bundle branches/bundle of His