Questios Flashcards
Which artery is most likely to be affected if ST elevation in present in leads V3 and V4?
-LAD -Leads V3 and V4 related to the anterior portion of the heart. Therefore ST elevation in these leads suggests an anterior infarct. The anterior portion of the heart is supplied mainly by the left anterior descending artery therefore this is most likely to have been affected.
what does tall t wave suggest
- hyperaemia , so check serum levels for potassium - potassium leakage , so early MI b tissue death
whats the early sign of MI on a egg?
-all peaked T-waves can suggest a number of abnormalities. If seen in all leads then they usually suggest the individual has hyperkalaemia. However if tall T waves are seen in a particular group of leads it suggests early MI. The tall T waves are due to potassium leaking through the damaged membrane over the infarcted area.
What is a common cause of right axis deviation?
-In right ventricular hypertrophy the increased muscle mass of the right ventricle causes increased signal on the ECG. As a result the axis of the heart is shifted to the right with lead III becoming more positive and lead I and II becoming less positive.
what does short PR interval suggest and normal PR interval duration
-0.12-0.2 seconds - 3-5 small squares since each small square = 0.04 - Wolff-Parkinson-White syndrome
WPW
wolff-parkinson-white syndrome -most common ventricular pre-excitation syndrome - bypass AVN, instead go through the bundle of Kent so ventricles partially depolarise early so get a delta wave between the p-r interval, and a prolonged QRS - can cause supra ventricular fibrillation
what does sinus rhythm means?
- P wave precedes the qrs complex
If ST-elevation was noted in leads II, III and aVF what would it suggest?
inferior aspect MI
What is the most common cause of left axis deviation?
-defects in the conduction system -rarelyLVH
LVH
PREMATURE VENTRICULAR ECTOPIC BEATS
LVH
PVEB
wolff-parkinson-white syndrome
LBBB vsRBBB
