Electrophysio Flashcards
1
Q
Explain hyperkalemia
A
- tooo much K in blood + extracellular fluid
- cell moves into more positive membrane potential: eventually reaches threshold and depolarizes
- neurons can fire when we dont watn them to fire
- may be seen as twitchy
- can lead to VT or VF
2
Q
Talk about K and hyperkalemia
A
normal is 3.5-5.3
crticial value >7
-willl start dialysis when this happens
signs:
- fatigue, muscle weakness, flaccis paraylsis, paresthesis
- ECG: widening of QRS professing to ventricular tachcardia/frib; cardiac arrest
3
Q
Talk about K and hypokalemia
A
crit value: < 3
signs:
- fatigue, weakness, fasciculations, respiratory failure, paralyiss
- ECG: ST segment depression, PVC/PAC, ventricular/atrial tachy, ventricular fib
4
Q
what are the 4 cardiac myocyte properties?
A
- excitability
- contracility
- automatciity
- conductivity
5
Q
what does the P wave represent?
A
atrial depolarization
6
Q
what does the QRS wave represent?
A
ventricular depolorization
7
Q
what does the T wave represent?
A
ventricular repolarization
