AHN 568 UNIT 1 WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS LATEST 2024 – 2025
ALREADY GRADED A+
positive deflection on EKG - ANSWERS-occurs when depolarization is moving
TOWARDS a positive electrode
Negative Deflection on EKG - ANSWERS-occurs when depolarization is moving
AWAY from a positive electrode
Normal Axis - ANSWERS-Lead I= (+) QRS
Lead aVF = (+) QRS
Between 0-+90
Left Axis Deviation - ANSWERS-Lead I= (-) QRS
Lead aVF = (+) QRS
,Right axis deviation - ANSWERS-Lead I= (+) QRS
Lead aVF = (-) QRS
Extreme Right axis deviation - ANSWERS-Lead I= (-) QRS
Lead aVF = (-) QRS
Right Ventricular Hypertrophy - ANSWERS-Main Criteria:
o S wave < R wave in V1
o R wave becomes progressively smaller in V2-V4'
o S wave persists in V5 and V6
o RAD with slightly widened QRS
o Rightward rotation in the horizontal plane
o Strain pattern may be present à asymmetrical, down sloping T wave in some
patients depending on pathology
Bundle of HIS
Rate?
Location? - ANSWERS-pathway for electrical signals to be transmitted to the
ventricles
Rate: 40-45 bpm
Location: partially in right atrium and upper portion of interventricular septum
that connects the AV node and 2 bundle branches
, Purkinjie Fibers
Rate? - ANSWERS-hair-like fibers that spread out from bundle branches into the
ventricles; innervate myocardial cells directly; initiate ventricular depolarization
Rate: 20-40 bpm
Sinoatrial Node (SA node)
Rate?
Location & Area of intervention?
EKG? - ANSWERS-Natural pacemaker of the heart
Rate: 60-100 bpm
Location: Upper portion posterior portion of the Right Atrium near superior vena
cava
EKG: represented as the P wave
Atrioventricular node (AV node)
Rate?
Location? - ANSWERS-A specialized mass of conducting cells located at the
atrioventricular junction in the heart. (back-up pacer of the heart
Rate 40-60 bpm
Location: Near the tricuspid valve
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