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EKG-Baweja

Terms in this set (151)

what does a standard L sided 12-lead EKG have leads up to?
a standard L sided 12-lead EKG has leads up to V6
which leads are not present on a standard 12 lead EKG?
leads V7, 8, 9
list the components of the cardiac conduction sequence
1. sinoatrial node (pacemaker)
2. internodal pathway--> carries impulse from SA to AV node
3. atrioventricular node
4. atrioventricular bundle (bundle of His)
5. bundle branches
6. purkinje fibers--> distribute the electrical impulse to the ventricle and myocardium
where do you place leads V1 and V2?
on either side of the sternum
where do you place leads V3, 4, 5, 6?
on the L (farther out from sternum)

4: midclavicular line
6: axillary line
where do you place leads V7, 8, 9?
on the back to look at the posterior wall of the heart

7: posterior axillary line
8: midscapula
9: paravertebral space
why did we add leads V7, 8, 9?
there was a blind spot (posterior wall of the heart) that the EKG couldn't see
what do you do if the patient has dextrocardia?
flip the leads to cause a R sided EKG
what would you see on a R sided EKG if there was a Right infarct with the Right coronary artery?
the inferior wall is affected; see an ST elevation in R sided leads
which part of the EKG should you measure to diagnose heart block?
PR interval
define the PR interval on the EKG
beginning of P to QRS
define the PR segment on the EKG
end of P to QRS
define the QT interval on the EKG
beginning of Q to end of T
T/F: the EKG is flawed
T: all tests including EKGs are flawed
1. detect things that aren't present (false positives)
2. miss things that are present (false negatives)
3. know your patient and pretest clinical probability to figure out what to do
when are you most likely to get a false positive
do a test on a low probability set
-it could be that someone has an abnormal EKG that reads as acute MI but unlikely chance because in wrong population
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