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34 Cards in this Set

  • Front
  • Back
SA node is supplied with blood from the RCA what percent of the time? LCA? Both?
59%
38%
3%
Prolonged QT can be associated with what 2 electrolyte abnormalities?
Hypocalcemia
Hypomagnesemia
Pacemakers do not work with what electrolyte abnormality?
Hyperkalemia
Leads involved in an inferior MI?
Leads II, III, aVF
Leads involved in a Septal MI?
Leads V1, V2
Leads involved in an Anterior Wall MI?
V3, V4
Leads involved in a Lateral Wall MI?
Leads I, aVL, V5, V6
What is the cause behind sinus arrhythmia?
Varies with respiration
What is the difference between Wandering Atrial Pacemaker and Multifocal atrial tachycardia?
MAT is WAP with tachycardia
Describe Multifocal Atrial Tachycardia:
Rate: Greater than 100
Rhythm: Irregularly Irregular
P wave: At least 3 morphologies
Describe the difference between Mobitz type I and II second degree block?
Type I: Wenckeback: Progressive prolongation of PR interval.
Type II: Same PR interval before a dropped beat.
In what leads are P waves almost always positive? What can you consider if these are negative?
I, II, V4, V5, V6

If the P's are inverted, consider low pacemaker or AV node pacemaker.
An M shaped P wave, >0.12s in Leads I, II represents what?
Left atrial enlargment.
What is a finding is aVL that would signify LVH?
R wave greater that 11mm
What are the EKG findings in Right Atrial Enlargment?
P waves greater that 2.5 mm high. Most commonly in leads II, III.
A biphasic P wave in V1 is consistent with what finding?
Left aftrial
When you see PR depression, what syndromes findings could fit with that finding?
Pericarditis
Atrial Infarction
What is the normal PR interval?
0.12 to 0.20 seconds
Delta wave is seen in what condition?
WPW
Sgarbossa's criteria
ST elevation ≥1 mm in a lead with upward (concordant) QRS complex - 5 points
ST depression ≥1 mm in lead V1, V2, or V3 - 3 points
ST elevation ≥5 mm in a lead with downward (discordant) QRS complex - 2 points
≥3 points = 90% specificity of STEMI (sensitivity of 36%)
EKG criteria for LVH:
Add the depth of the S wave in V1 or V2 to the R wave of V5 or V6. If >35 mm = LVH.

Or aVL R wave >11
I R > 12
aVF R >20
Determining LVH: Add the depth of the _ wave in V1 or V2 to the _ wave of V5 or V6. If >__ mm = LVH

Or
aVL R wave >11
I R > __
aVF R >20.
S
R
35

12
Causes of RVH:
PE
Pulmonary HTN
Scarring
What are the EKG findings in V1 or V2 that show RVH?
R:S ratio greater than 1
What EKG findings make Q waves pathologic?
Q wave >0.03 seconds or Q 1/3 of size of R wave.
Where is the QS wave found generally?
V1, if it extends into V2, V3 it could signify anteroseptal MI.
When does the Osborn or J wave present?
Hypothermia
QRS notching is also known as what?
Early repolarization
What are the main criteria for RBBB on EKG?
QRS >0.12 s
Slurred S wave in leads I and V6
RSR' in V1 with R' larger than R
Symmetric vs. Asymmetric T waves, which is sign of potential MI?
Symmetric
S_Q_T_ pattern is seen in patients with large pulmonary embolism causing Right heart strain.
1
3
3
S1Q3T3 is seen in what condition?
PE, Right heart strain
In addition to RVH, R:S >1 is seen in what type of MI?
Posterior Wall MI
Hedgehogs
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