CCT Exam
Questions With Reviewed Correct
Detailed Answers
1. Heart Block - ANSWER - abnormality in the electrical conduction system of
the heart that disrupts the propagation of electrical impulses through the AV
node.
- a decreased spread of electrical impulses leads to a decreased HR
- Symptoms: fainting, dizziness, SOB, CP
2. 1st phase in cardiac cycle - ANSWER - Ventricles relax and fill with blood -
lower pressure in ventricles than in atrium = AV valves open; blood from atrium to
ventricles
- increase in HR, decreases ventricular filling & atrial contraction marks the end -
diastole
3. 2nd Degree AVB Type I - ANSWER - block is high in the AV node
- some impulses do not reach the ventricle at all
- caused by acute conditions
- AV node fatigues with each heart beat, leading to a prolonged PR, each interval
lengthens until a heartbeat is skipped
- as PR is lengthening, the QRS is shortening with each beat
- No serious symptoms
- usually no treatment
, 4. 2nd degree AVB Type II - ANSWER - occurs below the AV node in a fascicle
that conducts electrical impulses to the ventricles
- less common than Type I
- more serious than type I
- possible need of a pacemaker
5. 3rd phase in cardiac cycle - ANSWER - ventricular relaxation
- vent pressure rapidly decreases when blood is ejected from vents into blood
vessels leading away from the heart
- when pressure falls below the pressure in the blood vessel (aorta or pulm
artery), the semi-lunar valves are forced closed &
- this closure marks the end of the systole & beginning of diastole
- both vent valves are closed & no blood is flowing in or out
- Atrioventricular valves are opened & ventricular filling begins again
6. Failure of a cardiac PM on ECG - ANSWER - QRS is absent & p wave
may/may not be absent
- small pacer spikes may still be seen
7. Recognizing AV dissociation on ECG - ANSWER - QRS complex will be
normal
- no p wave present possibly
- normal p wave possible but PR will vary in length
8. Myocardial Injury as seen on ECG - ANSWER - elevated ST segment
Questions With Reviewed Correct
Detailed Answers
1. Heart Block - ANSWER - abnormality in the electrical conduction system of
the heart that disrupts the propagation of electrical impulses through the AV
node.
- a decreased spread of electrical impulses leads to a decreased HR
- Symptoms: fainting, dizziness, SOB, CP
2. 1st phase in cardiac cycle - ANSWER - Ventricles relax and fill with blood -
lower pressure in ventricles than in atrium = AV valves open; blood from atrium to
ventricles
- increase in HR, decreases ventricular filling & atrial contraction marks the end -
diastole
3. 2nd Degree AVB Type I - ANSWER - block is high in the AV node
- some impulses do not reach the ventricle at all
- caused by acute conditions
- AV node fatigues with each heart beat, leading to a prolonged PR, each interval
lengthens until a heartbeat is skipped
- as PR is lengthening, the QRS is shortening with each beat
- No serious symptoms
- usually no treatment
, 4. 2nd degree AVB Type II - ANSWER - occurs below the AV node in a fascicle
that conducts electrical impulses to the ventricles
- less common than Type I
- more serious than type I
- possible need of a pacemaker
5. 3rd phase in cardiac cycle - ANSWER - ventricular relaxation
- vent pressure rapidly decreases when blood is ejected from vents into blood
vessels leading away from the heart
- when pressure falls below the pressure in the blood vessel (aorta or pulm
artery), the semi-lunar valves are forced closed &
- this closure marks the end of the systole & beginning of diastole
- both vent valves are closed & no blood is flowing in or out
- Atrioventricular valves are opened & ventricular filling begins again
6. Failure of a cardiac PM on ECG - ANSWER - QRS is absent & p wave
may/may not be absent
- small pacer spikes may still be seen
7. Recognizing AV dissociation on ECG - ANSWER - QRS complex will be
normal
- no p wave present possibly
- normal p wave possible but PR will vary in length
8. Myocardial Injury as seen on ECG - ANSWER - elevated ST segment
