age 1 of 62
NUR 4420 CRITICAL CARE EXAM ONE (WEEK 3) EXAM
QUESTIONS AND ANSWERS
4 layers of the heart ......ANSWER........Pericardium
Epicardium
Myocardium
Endocardium
Pericardium ......ANSWER........The serous, fibrous layer that
encloses the heart
The pericardial sac is a fluid space between the visceral side of
the pericardium and the parietal layer
---> Contains 10 ml of pericardial fluid
If you're having an MI, this is the layers you're having it in
......ANSWER........Myocardium
If you're having an MI, what layer is injured FIRST
......ANSWER........Endocardium
---> You're not getting blood supply from the coronary arteries
,age 2 of 62
STEMI MI vs. Non-STEMI MI ......ANSWER........STEMI = All layers
lost w/ MI
Non-STEMI = only a portion of the layers are damaged w/ MI
Pulmonary circulation is a low pressure system
t or f ......ANSWER........true
What happens if the L. ventricle is damaged?
......ANSWER........The LV will have difficulty pumping out
oxygenated blood to the rest of the body
---> LV is involved most often w/ MI
A damaged LV will affected SV, EF, & CO
*Give meds that help w/ contractility)
Normal CO ......ANSWER........4-8 L/min
Meds to help w/ contractility ......ANSWER........Digoxin
Positive inotrope (*Dobutamine*)
Dobutamine helps some w/ LVD
,age 3 of 62
During contraction, the LV pressure is about _____x greater than
RV pressure ......ANSWER........5
Atrioventricular (AV) valves ......ANSWER........Tricuspid
Bicuspid/mitral
*Clase during ventricular systole*
Semi-lunar valves ......ANSWER........Aortic & pulmonic
*Close during diastole*
SA node ......ANSWER........Located at the mouth of the SVC & RA
---> Fires at 60-100 bpm
Perfused by R. coronary a.
*In order to have sinus rhythm, you must have a functioning SA
node*
Atrial depolarization occurs through what 4 specialized
conduction pathways? ......ANSWER........Bachmann's Bundle (to L.
atrium)
, age 4 of 62
3 internodal pathways to AV node
Internodal tracts ......ANSWER........They make sure that both sides
of the heart are stimulated before moving the AP to the AV
nodes
Internodal pathways take the signal to the bundle of His
(located in septum of heart)
*Internodal tracts = atrial depolarization*
Bundle of His depolarization ......ANSWER........Once the signal
moves through the bundle of His, it splits into the R & L bundle
branches
*Ventricular depolarization*
*Electrolytes of conduction* ......ANSWER........Na+ & K+
NUR 4420 CRITICAL CARE EXAM ONE (WEEK 3) EXAM
QUESTIONS AND ANSWERS
4 layers of the heart ......ANSWER........Pericardium
Epicardium
Myocardium
Endocardium
Pericardium ......ANSWER........The serous, fibrous layer that
encloses the heart
The pericardial sac is a fluid space between the visceral side of
the pericardium and the parietal layer
---> Contains 10 ml of pericardial fluid
If you're having an MI, this is the layers you're having it in
......ANSWER........Myocardium
If you're having an MI, what layer is injured FIRST
......ANSWER........Endocardium
---> You're not getting blood supply from the coronary arteries
,age 2 of 62
STEMI MI vs. Non-STEMI MI ......ANSWER........STEMI = All layers
lost w/ MI
Non-STEMI = only a portion of the layers are damaged w/ MI
Pulmonary circulation is a low pressure system
t or f ......ANSWER........true
What happens if the L. ventricle is damaged?
......ANSWER........The LV will have difficulty pumping out
oxygenated blood to the rest of the body
---> LV is involved most often w/ MI
A damaged LV will affected SV, EF, & CO
*Give meds that help w/ contractility)
Normal CO ......ANSWER........4-8 L/min
Meds to help w/ contractility ......ANSWER........Digoxin
Positive inotrope (*Dobutamine*)
Dobutamine helps some w/ LVD
,age 3 of 62
During contraction, the LV pressure is about _____x greater than
RV pressure ......ANSWER........5
Atrioventricular (AV) valves ......ANSWER........Tricuspid
Bicuspid/mitral
*Clase during ventricular systole*
Semi-lunar valves ......ANSWER........Aortic & pulmonic
*Close during diastole*
SA node ......ANSWER........Located at the mouth of the SVC & RA
---> Fires at 60-100 bpm
Perfused by R. coronary a.
*In order to have sinus rhythm, you must have a functioning SA
node*
Atrial depolarization occurs through what 4 specialized
conduction pathways? ......ANSWER........Bachmann's Bundle (to L.
atrium)
, age 4 of 62
3 internodal pathways to AV node
Internodal tracts ......ANSWER........They make sure that both sides
of the heart are stimulated before moving the AP to the AV
nodes
Internodal pathways take the signal to the bundle of His
(located in septum of heart)
*Internodal tracts = atrial depolarization*
Bundle of His depolarization ......ANSWER........Once the signal
moves through the bundle of His, it splits into the R & L bundle
branches
*Ventricular depolarization*
*Electrolytes of conduction* ......ANSWER........Na+ & K+
