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AACN TEST LATEST UPDATED
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AACN TEST LATEST UPDATED...
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Endocardium is the inner layer of the heart.Myocardium is the thick middle layer of the heart.
Epicardium - The outer surface of the heart muscle.
RCA - ANSWER extends to the back of the heart and perfuses the posterior
heart.
ECG preparation: ANSWER alcohol before skin prep.
How long does it take the paper to come out of the EKG machine? - ANSWER:
25 mm/s
Vertical axis - ANSWER voltage (tiny box = 0.1 mv)
Horizontal axis - Answer time--small box = 0.4 seconds
How frequent are tick marks? - Answer every three seconds.
Isoelectric line: the electrical charges in the heart are equal.
5 lead - Answer: smoke over fire, clouds over grass, brown in the middle.
, ANSWER: QT prolongation can lead to torsades.
- may be impacted by medications (antibiotics, antidysrhythmic, antipsychotic
meds).
The atrial pacemaker fires before the P wave.
Ventricular pacemaker fires... - Answer before the QRS complex
Threshold - ANSWER the minimum amount of energy required to produce a
"capture"
Failure to pace - ANSWER: No pacemaker activity; it is not firing. This could
be a sensitivity or a mechanical issue.
Failure to capture indicates that the pacemaker is firing but no P wave or QRS
complex follows the pacer spike. The impulse is insufficient to depolarize the
heart (raising the mA will resolve this issue).
Failure to sense: ANSWER If the pacer spike occurs in the T wave, it is failure
to perceive.
Oversensing - ANSWER: The pacemaker is too sensitive.
- for example, if a patient coughs and the pacemaker believes it is due to the
patient's heart rate.
- To lower sensitivity, increase the mV.
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