ECG Tracing Flashcards
Sequential process of depolarization and repolarization of myocardial cells
ECG
Instrument used to record the electrical impulse of the heart
Electrocardiograph
Record of the mechanical tracing of the heart
Electrocardiogram
Activation is known as depolarization and relaxation (recovery) is known as
repolarization
Can ECG detect heart murmurs?
NO only through auscultation of the heart or echocardiogram
Measured in millivolts or how high is the deflection
Amplitude
Time to cross one small square is
0.04 seconds
Measured along the vertical axis with one large square representing 0.5 mV
Voltage or amplitude
Atrial Depolarization
P wave
Atrial Repolarization seen on ECG is hidden by the
QRS complex
Not always seen on ECG
Q wave (first deflection downward)
QRS complex is the
Depolarization of the ventricles
First deflection upward
R wave ( early depolarization of the ventricles)
Late depolarization of ventricles
S wave
Direction of the electrical current produced by the patients heart
Cardiac vector
Placing 2 sensors in the body , One positive and one negative leads
Bipolar lead
Flow from Right side (-) to the left side (+) same direction as the lead axis of the ECG leads to what type of deflection
Positive large upward deflection
When the cardiac current flow is opposite direction as the axis of the ECG lead. What type of deflection ?
Negative downward deflection
When the direction is perpendicular or at 90 degree to the lead axis of the ECG
Isoelectric line or Biphasic or equiphasic deflection
