NURS 2400 Exam 2 - EKG interpretation
QUESTIONS AND CORRECT ANSWERS
SA Node - CORRECT ANSWER -Pacemaker cells create electrical signals 60-100 times per
minute
-Atrial depolarization occurs
AV Node - CORRECT ANSWER -Relays the impulse from the atria and sends to the ventricles
-BACKUP pacemaker, rate of 40-60 per minute (IF SA FAILS)
Bundle of His - CORRECT ANSWER -Divides impulses into left and right bundle branches
bundle branches - CORRECT ANSWER Supplies the right and left ventricles
Purkinje Fibers - CORRECT ANSWER -A group of conduction fibers at the end of the bundle
branches
-Is the back up (back up) pacemaker if both SA and AV nodes fail
-Rate of LESS than 40 per minute
P wave - CORRECT ANSWER -Originates from sinus node
-Depolarization of the right and left atria
-if you have a P wave, you are NOT in a fib or a flutter
P wave normal look - CORRECT ANSWER -Round, positive in lead II
-Height: 0.5-2.5 mm
-Width: 0.10 seconds or less
-1 P to every 1 QRS
PR interval - CORRECT ANSWER -Onset of atrial depolarization to onset of ventricular
depolarization
-Include start of P wave to the start of QRS
, -Normal duration: 0.12-0.20 seconds
-Abnormalities: short or prolonged PR intervals
QRS interval - CORRECT ANSWER -Represents depolarization of the right and left ventricles
QRS interval normal - CORRECT ANSWER -Positive in lead II
-Duration: 0.10 seconds or less
-Abnormal: duration >0.12 seconds
-Bundle branch block
-Ventricular hypertrophy
-THINK HYPERKALEMIA OR TRICYCLIC POISONING
ST interval - CORRECT ANSWER -Represents ventricular repolarization
ST interval normal - CORRECT ANSWER -FLAT line between QRS and T wave
ST interval abnormal - CORRECT ANSWER -ST depression or ST elevation
ST elevation: STEMI - CORRECT ANSWER -ST elevation Myocardial infarction
ST depression: N-Stemi - CORRECT ANSWER Non-ST elevation myocardial infarction
T wave - CORRECT ANSWER -Ventricle repolarization
-Normal: rounded with gradual slop upward
-Always follows the QRS
QT interval - CORRECT ANSWER -Time between onset of ventricular depolarization and end
of ventricular repolarization
QT interval measurement - CORRECT ANSWER Beginning of QRS to end of T wave
QUESTIONS AND CORRECT ANSWERS
SA Node - CORRECT ANSWER -Pacemaker cells create electrical signals 60-100 times per
minute
-Atrial depolarization occurs
AV Node - CORRECT ANSWER -Relays the impulse from the atria and sends to the ventricles
-BACKUP pacemaker, rate of 40-60 per minute (IF SA FAILS)
Bundle of His - CORRECT ANSWER -Divides impulses into left and right bundle branches
bundle branches - CORRECT ANSWER Supplies the right and left ventricles
Purkinje Fibers - CORRECT ANSWER -A group of conduction fibers at the end of the bundle
branches
-Is the back up (back up) pacemaker if both SA and AV nodes fail
-Rate of LESS than 40 per minute
P wave - CORRECT ANSWER -Originates from sinus node
-Depolarization of the right and left atria
-if you have a P wave, you are NOT in a fib or a flutter
P wave normal look - CORRECT ANSWER -Round, positive in lead II
-Height: 0.5-2.5 mm
-Width: 0.10 seconds or less
-1 P to every 1 QRS
PR interval - CORRECT ANSWER -Onset of atrial depolarization to onset of ventricular
depolarization
-Include start of P wave to the start of QRS
, -Normal duration: 0.12-0.20 seconds
-Abnormalities: short or prolonged PR intervals
QRS interval - CORRECT ANSWER -Represents depolarization of the right and left ventricles
QRS interval normal - CORRECT ANSWER -Positive in lead II
-Duration: 0.10 seconds or less
-Abnormal: duration >0.12 seconds
-Bundle branch block
-Ventricular hypertrophy
-THINK HYPERKALEMIA OR TRICYCLIC POISONING
ST interval - CORRECT ANSWER -Represents ventricular repolarization
ST interval normal - CORRECT ANSWER -FLAT line between QRS and T wave
ST interval abnormal - CORRECT ANSWER -ST depression or ST elevation
ST elevation: STEMI - CORRECT ANSWER -ST elevation Myocardial infarction
ST depression: N-Stemi - CORRECT ANSWER Non-ST elevation myocardial infarction
T wave - CORRECT ANSWER -Ventricle repolarization
-Normal: rounded with gradual slop upward
-Always follows the QRS
QT interval - CORRECT ANSWER -Time between onset of ventricular depolarization and end
of ventricular repolarization
QT interval measurement - CORRECT ANSWER Beginning of QRS to end of T wave
