Exam (elaborations)
BAMC TELEMETRY TEST QUESTIONS AND ANSWERS
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BAMC TELEMETRY TEST QUESTIONS AND ANSWERS
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BAMC TELEMETRY TEST QUESTIONSAND ANSWERS
Action potential - Answer-The graphic representation of cellular electrical events
Describes the changes in intracardiac voltage that lead to impulse formation and
conduction and, ultimately, to cardiac contraction
Automaticity - Answer-The ability to initiate impulses spontaneously
Conductivity - Answer-The ability to conduct an impulse along the cell membrane
Contractility - Answer-The ability to contract in response to a stimulus
Depolarization - Answer-A change in the resting electrical state of the cardiac cell
The inside of the cell becomes more positive and impulse is spread through the heart
Excitability - Answer-The ability of cells to respond to a stimulus
Refractory period - Answer-Absolute
Relative
Absolute refractory period - Answer-The cardiac cell is unable to accept or respond to a
stimulus
Relative refractory period - Answer-A stronger than normal impulse may stimulate the
cardiac cell to depolarize
Repolarization - Answer-Return of the cardiac cell to the resting membrane state
The inside of the cell becomes more negative
Resting membrane potential - Answer-The electrical charge across the cardiac cell
membrane between impulses
About -70 mV
Threshold - Answer-The electrical level at which the cell will continue to depolarize
without additional stimulus
About -60 mV
Sinoatrial node (SA node) - Answer-Located high in the right atrium, near the junction of
the superior vena cava
It is the primary pacemaker of the heart with normal rate automaticity of 60-100 bpm
Internodal atrial pathways - Answer-Conduct the impulse from the SA node through the
right atrium musculature to the AV node
, Three tracts
- Bachmann's (anterior, fast tract)
- Wenchkebach's (middle)
- Thorel's (posterior, slow tract)
Atrioventricular node (AV node) - Answer-Located low in the right atrium, adjacent to the
inter-atrial septum
Delays impulse from atria to allow atrial contraction and synchronizes atrial contribution
to ventricular pumping
The impulse is then sent to the ventricles via the bundle of His, normally the AV node is
the only structure that is capable to conducting impulses to the ventricles
Can serve as a backup pacemaker
Inherent rate of automaticity is 40-60 bpm
Bundle of His - Answer-Arises from the AV node and conducts impulse to bundle
branch system
Bundle branch system - Answer-Pathways that arise from the Bundle of His
Composed of right bundle branch
Right bundle branch - Answer-A direct continuation of the bundle of His
Transmits impulse down right side of the inter ventricular septum to the myocardium of
the right ventricle
Left bundle branch - Answer-Separates into 3 fascicles
- Left posterior fascicle
- Left anterior fascicle
- Septal fascicle
Left posterior fascicle - Answer-Transmits impulse over posterior and inferior
endocardial surface of the left ventricle
Left anterior fascicle - Answer-Transmits impulse over anterior and superior endocardial
surfaces of the left ventricle
Purkinje fibers - Answer-Arises from distal portion of bundle branches, transmits
impulses into subendocardial layers of both ventricles
Provides for the depolarization
Followed by ventricular contraction and ejection of blood out of the ventricles
Intrinsic rate of 20-40 bpm
ECG markers - Answer-Isoelectric line
- flat line between complexes
P wave - Answer-Indicates that the impulse originated at the SA node and the atrial are
normally depolarized
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