Cardiac Electrophysiology Flashcards
what is the sinoatrial node?
Pacemaker: it starts the AP
what does the atrioventricular node do?
delays the AP to allow the atria to contract the ventricle
what does the bundle of His do?
transmit AP to the ventricles
what does the purkinje fibers do?
distributes AP throughout the ventricles
what is an electrocardiogram?
a recording of electrical activity of the heart
what does the electrocardiogram do?
measures specific electrical events
T/F electrocardiogram is one complete cycle of the heart conduction system
True
what are the five waves of the electrocardiogram?
P, Q, R, S, T
what are the two divisions of the electrocardiogram?
PR interval and QT interval
what is the complex of the electrocardiogram?
QRS complex
what are the two segments of the electrocardiogram?
PR and ST segment
what is the P wave?
the AP spreads through the atria = atria contraction
what is the Q wave?
the first phase of ventricular depolarization
what is the R wave?
the second phase of ventricular depolarization
what is the S wave?
the final phase of ventricular depolarization of the purkinje
what is the T wave?
it repolarizes the ventricles
what is the PR interval?
the time from the start of atrial depolarization to the start of ventricular depolarization
what is the QT interval?
the total time of ventricular depolarization and repolarization
what is the QRS complex?
ventricular depolarization (AP spreads through the ventricles)
what is the PR segment?
time from the start of atrial depolarization to the start of ventricular depolarization
what is the ST segment?
ventricles are fully depolarized and contracting
T/F the cardiac cycle is the sequence of events that occur during one incomplete heartbeat
False, it is one fully completed heartbeat
what are the two main phases of the cardiac cycle?
systole and diastole
T/F systole contraction is when the blood is pumped out
True
