Exam 2 review Flashcards
Determine axis?
Lead 1 and Lead aVF. Normal=+,+ Left deviation=+,- Right deviation=-,+ Extreme right deviation=-,-
Normal QRS duration? Wide?
Normal=0.06-0.1sec
Wide= >0.1sec
RVH criteria?
Right axis deviation.
Poor R-wave progression=R-wave larger than S-wave in V1 and S-wave larger than R-wave in V6
R waves tallest in which two leads?
V4 and V5
LVH criteria?
Left axis deviation
R-wave amp in V5 or V6 plus S-wave amp in V1 or V2 exceeds 35mm (7 boxes)
Causes of Sinus Arrythmia?
Hypoxia, ischemia, irritability, sympathetic stimulants, drugs, lyte imbalance, enlargement/hypertrophy
What does the term “Sinus Arrythmia” imply?
A benign slight irregularly which is a variant of normal
Sinus tach rate?
> 100bpm
Sinus Brady rate?
<60bpm
What stops firing in a Sinus Arrest?
SA node stops firing
What does a rescue beat do?
Restarts sinus node.
Inhalation and sinus rate?
Increases
Exhalation and sinus rate?
Decreases
Where does a rescue beat originate from?
AV-node (most common)
When rescue beat originates from the AV node what’s it called?
Junctional Pacemaker
Which wave does the junctional rhythm lack?
P-waves
Sick Sinus Syndrome is a dysfunction of which node?
SA- node
Sick Sinus Syndrome is the inability of the heart to do what?
Inability to generate heart rate to meet physiologic needs
Sick Sinus Syndrome can cause what rates?
Profound bradycardia, sinus pause, sinus arrest, paroxysmal SVT
Most common ventricular arrythmia?
Premature Ventricular Contraction (PVC)
The QRS-complex of a PVC looks like?
Wide and bizarre. ≥0.12sec
When to PVCs become dangerous?
Run of >3, variable morphology, during MI
Premature Atrial Contraction (PAC) due to what?
Ectopic focus which fires at random
What do the P-waves of PACs look like compared to other beats?
Different from other beats
PAC aka
Atrial Premature Beat
Where do Supraventricular Arrythmias originate from?
Above ventricles in AV-node or atria
How long can Supraventricular Arrythmias last for?
Single beats or sustained rhythms lasting for seconds to years
Supraventricular Tachycardia rate?
150-250bom
Does Supraventricular Tachycardia have P-waves?
NO!
Supraventricular Tachycardia QRS-complex wide or narrow?
Narrow
Supraventricular Tachycardia initiatedby?
Premature supraventricular beat atrial or junctional
Supraventricular Tachycardia driven by?
Reentrant circuit looping within the AV-node (AVNRT)
Causes of Supraventricular Tachycardia?
Alcohol, coffee, exitement
First tx for Supraventricular Tachycardia?
Valsalva
Second tx for Supraventricular Tachycardia?
Adenosine
MC type of Supraventricular Tachycardia?
Atrioventricular Nodal Reciporcating Tachycardia
Supraventricular Tachycardia is what type of rhythm?
Reentrant rhythm
Supraventricular Tachycardia is a disorder of what?
Disorder of impulse transmission
Supraventricular Tachycardia on-set and cessation time?
Sudden on-set, sudden cessation
Does Supraventricular Tachycardia have P-waves?
No P-waves!
Why doesn’t Supraventricular Tachycardia have P-waves? (Hint: where originates)
Originates below atria in AV-node or ventricules
Which MC- Afib or AFlutter?
Afib
HTN, mitral valve dz, thyrotoxicosis, pericarditis can all cause which rhythm abnormality?
Afib
Afib rhythm regular or irregular?
irregular
Afib rate?
120-180
P-waves in Afib?
No true P-waves due to completely chaotic atria
Which rhythm is irregularly irregular, narrow complex, with no discernable P-waves at a rate of 120-180?
Afib