unit 4 big test
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what starts the pumping of the heart muscle
electrical activity
what causes the electrical current in the heart muscle
chemical changes in the cells of the heart
what is the state of a resting cell
negative charge
what is the mechanical response to depolarization (cell turns positive)
systole
why type of electrode is only used for a short time
resting
when would you chose monitoring electrodes over resting electrodes
when the electrodes must stay on the patient longer
what is telemetry used for
ongoing mobile monitoring in a hospital setting
how many leads are used in telemetry
5
what is a holter monitor used for
ongoing mobile monitoring outside of an inpatient setting
what is continuous monitoring used for
ER, ICU, or bedside monitoring without movement
how many leads are viewed in continuous monitoring
3-5
what is a 12 lead EKG used for
evaluating heart rhythm and signs of heart diease
what is a stress test used for
evaluating for heart disease when heart rate is increased
how many leads are used in a stress test
12
which electrode is positive and negative in lead 1
LT arm positive, RT arm negative
which electrode is positive and negative in lead 2
LT leg positive, right arm negative
which electrode is positive and negative in lead 3
left leg, left arm
what is positive and negative in the augmented leads
in each lead a different limb is positive, the negative is always the central terminal
what are the positive electrodes in aVR, aVL, and aVF
right arm, left arm, and the leg left
what are the precordial leads
v1-v9
what is the negative in the precordial leads
the central terminal
which leads look at the inferior wall of the heart (right coronary artery)
lead 2, lead 3, and aVF
which leads look at the anterior wall of the heart (left anterior descending)
v1, v2, v3, v4
which leads look at the left lateral wall (circumflex)
lead 1, aVL, v5 and v6