Cardiac Dysrhythmias Comprehensive Question and
Answers 2024
Three causes of dysrhythmias
1. disturbances in automaticity
2. disturbances in conductivity
3. reentry of impulses
the initiation of impulses
automaticity
the speed of impulses
conductivity
Cardiac tissue is depolarized multiple times by the same impulse
reentry of impulse
Normal calcium levels
9-10.5 mg/dL
Normal magnesium levels
1.7-2.2 mg/dL
How would kidney dz increase the risk for dysrhythmias?
inability to excrete K+
Two major concepts related to dysrhythmias
1. perfusion: decreased CO
2. oxygenation: decreased O2
Normal conduction ensures that the circulation of blood occurs in an _____
manner. With abnormal conduction, blood circulates in an _______ manner,
causing decreased ______ to the body and increased risk for ______.
even, uneven, perfusion, emboli
True or false: every cardiac cell has the potential to produce an impulse.
TRUE
Explain the movement of a NORMAL impulse through the heart
, SA Node -> AV Node -> R & L bundle branches -> Purkinje Fibers
Pacemaker of the heart
SA node
If the SA node fails, what takes over?
AV node
If the AV node fails, what takes over?
Bundle of His
Rate of the SA node
60-100 bpm
Rate of the AV node
40-60 bpm
Rate of the bundle branches
20-40 bpm
Explain the cardiac cycle and what each wave stands for
P-wave: atrial depolarization/contraction
QRS Complex: ventricular depolarization/contraction
T-wave: ventricular depolarization/relaxation
During which part of the cardiac cycle do we feel a pulse?
QRS complex
Strips are measured in ____ second intervals where each vertical line is _____
seconds apart.
6, 3
Give the normal times for a:
- small box
- large box
- small box: 0.04 seconds
- large box: 0.20 seconds (5 small boxes in each large box: 5x0.04)
How do you measure the PR interval?
from the beginning of the P wave to the beginning of the QRS complex
Normal PR interval time
0.12-0.20 seconds
Answers 2024
Three causes of dysrhythmias
1. disturbances in automaticity
2. disturbances in conductivity
3. reentry of impulses
the initiation of impulses
automaticity
the speed of impulses
conductivity
Cardiac tissue is depolarized multiple times by the same impulse
reentry of impulse
Normal calcium levels
9-10.5 mg/dL
Normal magnesium levels
1.7-2.2 mg/dL
How would kidney dz increase the risk for dysrhythmias?
inability to excrete K+
Two major concepts related to dysrhythmias
1. perfusion: decreased CO
2. oxygenation: decreased O2
Normal conduction ensures that the circulation of blood occurs in an _____
manner. With abnormal conduction, blood circulates in an _______ manner,
causing decreased ______ to the body and increased risk for ______.
even, uneven, perfusion, emboli
True or false: every cardiac cell has the potential to produce an impulse.
TRUE
Explain the movement of a NORMAL impulse through the heart
, SA Node -> AV Node -> R & L bundle branches -> Purkinje Fibers
Pacemaker of the heart
SA node
If the SA node fails, what takes over?
AV node
If the AV node fails, what takes over?
Bundle of His
Rate of the SA node
60-100 bpm
Rate of the AV node
40-60 bpm
Rate of the bundle branches
20-40 bpm
Explain the cardiac cycle and what each wave stands for
P-wave: atrial depolarization/contraction
QRS Complex: ventricular depolarization/contraction
T-wave: ventricular depolarization/relaxation
During which part of the cardiac cycle do we feel a pulse?
QRS complex
Strips are measured in ____ second intervals where each vertical line is _____
seconds apart.
6, 3
Give the normal times for a:
- small box
- large box
- small box: 0.04 seconds
- large box: 0.20 seconds (5 small boxes in each large box: 5x0.04)
How do you measure the PR interval?
from the beginning of the P wave to the beginning of the QRS complex
Normal PR interval time
0.12-0.20 seconds
