ECG Flashcards
(46 cards)
P-R interval
0.12 - 0.20 sec (3 - 5 small squares)
QRS width
0.08 - 0.12 sec (2 - 3 small squares)
QT interval
0.35-0.43 seconds
Widowmaker:
expression describing the complete closure of the left anterior descending (LAD) coronary artery. The LAD is an essential coronary artery and its occlusion can result in immediate death
Sinus node artery supplies:
right atrium
Right marginal artery supplies:
right ventricle
Posterior descending artery supplies:
inferior walls of both ventricles
interior portion of the interventricular septum
Circumflex artery supplies:
left atrium
posterior and lateral walls of the left ventricle
anterior and inferior walls of the left ventricle
Left anterior descending artery
anterior portion of the interventricular septum
diastole:
Phase of the cardiac cycle when myocardium is relaxed
systole
Phase of the cardiac cycle when the myocardium contracts
Atrial systole
when atria contract
Ventricular systole
when ventricles contract
ECG - electrocardiogram
graphic recording of electrical events
established electrode pattern results in specific tracing pattern
electrical pattern reveals blood supply problems
ECG records a positive (upward) deflection
If an electrode is placed so that wave of depolarization spreads toward the recording electrode
negative (downward) deflection
If wave of depolarization spreads away from recording electrode
V1
Fourth intercostal space to the right of the sternum
V2
Fourth intercostal space to the Left of the sternum
V3:
Directly between leads V2 and V4
V4:
Fifth intercostal space at midclavicular line
V5:
Level with V4 at left anterior axillary line
V6:
Level with V5 at left midaxillary line. (Directly under the midpoint of the armpit)
Where does Lead I travel?
travels’ horizontally
Its left pole (LA) is positive and its right pole (RA) is negative
What does Lead I show?
Shows a positive wave when an impulse moves towards the left arm, negative wave when an impulse moves away from the left arm
