test 2 COPY

Question 1

Right coronary artery feeds

Answer 1

inferior wall -feeds the upper portion of electrical system

Question 2

left main mi

Answer 2

sudden death

Question 3

left anterior descending (LAD)

Answer 3

anterior wall- feeds the left ventricle (widow maker) and th right bundle branch and portions of left bundle branch

Question 4

Creatine Kinase CK

Answer 4

enzyme specific to myocardium (MB), also types for skeletal muscle, brain and lung. CK-MB, detected about 4 hours after MI, peak 24 hrs post chest pain onset and elevated for 12 hours post MI. more than 4-6% indicate MI **Rapid bedside assays available. serial sampling (q6-8h X3) with troponin and ECG

Question 5

myoglobin

Answer 5

early nonspecific for MI. onset 30-60 min, peak 2 hours, duration 15 hours. DX female 10-60, male 15-90
Cleared from system rapidly, limited use for DX

Question 6

Troponins

Answer 6

specific for MI. onset 4-6 h, peak 24h, duration 2wks

DX (trop I): pos for MI >2.3, neg if <0.5, serial sampling with CK-MB

Question 7

p wave

Answer 7

atrial contraction/ polarization 0.06-0.12 sec, conduction problem SA node or atria

Question 8

PR Interval

Answer 8

time from atrial polarization to ventricle contraction 0.12-0.20 sec, conduction problem AV node, HIS, branches or within atria

Question 9

QRS Complex

Answer 9

Ventricular contraction/ depolarization 0.04-0.12sec, conduction prob of bundle branches

Question 10

ST segment

Answer 10

beginning of ventricular depolarization, 0.12 sec, ischemia or infarct, elevated- STEMI

Question 11

T wave

Answer 11

ventricular repolarization, 0.16 sec, ischemia or infarction, may be inverted with old injury

Question 12

QT interval

Answer 12

entire depolarization and repolarization of the ventricals0.34-0.44 seconds, repolarization disturbances