Flashcards in Exam 1 review Deck (20):
Identify the normal electrical power source of the heart
Pacemaker cells in SA node
Differentiate the physiology of a pacemaker action potential from a cardiomyocyte action potential
Recall the typical rates of depolarization of pacemaker cells in the sinus node (SA node), the atrioventricular node (AV node) and the ventricles
Recognize what the following wave forms represent on a cycle of cardiac contraction and relaxation within the EKG
a. P wave
b. Q wave
c. QRS complex
d. T wave
P-wave=both atria depolarize
Recognize the following conditions either by analyzing an EKG/rhythm strip or by description
a. ST elevation myocardial infarction
b. Cardiac ischemia
c. Right, left and biatrial enlargement
STEMI=1mm height in limb leads, 2mm height in precordial leads
RA enlargement=enlarged P wave
LA enlargement=wide P wave, notched
biartial enlargement=shark fin
Recall which leads correspond to each of the following areas of the heart
c. Left lateral
d. Right ventricular
Anterior=V2, V3, V4
Inferior=II, III, aVF
Left Lateral=I, aVL, V5, V6
Right Vent=aVR, V1
Recall how many seconds one small square represents on EKG paper
Recall how many seconds one large square represents on EKG paper
5 small squares long and high
Prolonged PR boxes and time?
>1 big box
Type of heart block!
Prolonged QT? Normal is ___ between QRS complexes
Normal <1/2 between two QRS complexes. 40% of cardiac cycle. Inversely proportial to heart rate.
Pathologic Q wave means? Measurement?
Irreversible myocardial damage.
≥1/3 height of R wave
Poor R wave progression means what is enlarged?
R Wave progression defined as
Pattern of progressively increasing R wave amplitude moving right to left in the precordial leads
List the 5 criteria for normal sinus rhythm
1. P wave before every QRS
2. Regular rhythm
3. Rate between 60-100bpm
4. Normal PR int (0.12-0.2)
5. Normal QT-int (<1/2 way between two QRS complexes)
Wide QRS defined? Due to?
Impulses generated in ventricles or abberant pathway through ventricles
Normal QRS time?
Identify if an EKG shows right axis deviation
Identify if an EKG shows left axis deviation
Recall the criteria for right ventricular hypertrophy
R>S in V1
S>R in V6
Poor R wave progression
R axis deviation (I=down, aVF=up)