ECG_coronary arteries_

Question 1

describe atrial fibrillation on an ECG?

Answer 1

Chaotic and erratic baseline (irregularly irregular) with no discrete P waves in between irregularly spaced QRS complexes.

Question 2

what are the complications of atrial fibrillation?

Answer 2

Can result in atrial stasis and lead to thromboembolic stroke.

Question 3

what is the treatment of AFib?

Answer 3

Treatment includes rate control, anticoagulation, and possible pharmacological or electrical cardioversion.

eg…rivaroxaban

Question 4

coronary artery occlusion most commonly occurs in ?

Answer 4

LAD, left anterior descenting

Question 5

the LAD of the coronary artery system supplies what parts of the heart?

Answer 5

the anterior 2/3 of the interventricular septum
anterior papillary muscle
anterior surface of the left ventricle

Question 6

the SA node and the AV node are usually supplied by which coronary artery?

Answer 6

RCA

Question 7

if you had an infarct to the RCA (which supplies the nodes) what would result?

Answer 7

bradycardia, heart block

Question 8

what is right dominant circulation, left dominant circulation and co-dominant circulation in relation to the heart?
give %’s
and origin or blood supply

Answer 8

Right- 85%- PDA (posterior descending artery) arises from RCA
Left- 8%- PDA arises from LCX
co-dominant- 7%- PDA arises

Question 9

what is the most posterior part of the heart? what would enlargement of this cause?

Answer 9

left atrium

dysphagia, hoarseness

Question 10

what does the LCX of the coronary artery system supply?

Answer 10

left lateral ventricle, and posterior wall of left ventricle

Question 11

what does the PDA of coronary system supply?

Answer 11

posterior 1/3 of AV spetum, posterior walls of ventricles