AACN TEST LATEST UPDATED

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.