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Cardiovascular System Flashcards

1
Q

What is the purpose of the cardiovascular system

A

To perfuse the organs and tissues with oxygenated blood

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2
Q

What three protective layers make up the pericardial sac?

A

Fibrous pericardium
Parietal pericardium
Visceral pericardium (Epicardium)

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3
Q

What is the fibrous pericardium?

A

A loose fitting sac that outlines and hold the heart

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4
Q

What is the parietal pericardium?

A

A serous membrane, fluid lines this area & helps reduce friction

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5
Q

What is the visceral pericardium (epicardium)

A

The inner most protective layer of the pericardial sac
Covers the heart muscle directly
The outermost cardiac layer
Prevents friction as the heart beats

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6
Q

Name the cardiac layers

A

Epicardium
Myocardium
Endocardium

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7
Q

What is the myocardium

A

Thick layer of muscle within the heart

Aides in contraction of the heart

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8
Q

What is the endocardium

A

The inside cardiac chamber
Lines the inside of the heart
Lines all cardiac chambers and valves

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9
Q

What are coronary arteries?

A

Arteries that surround the heart and provide the heart with oxygenated blood

Oxygenated blood travels from the aorta to the cardiac arteries

Without the coronary arteries, the heart wouldn’t receive oxygenated blood and would not function / would die

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10
Q

Name the four cardiac chambers

A

Superior Chambers:
Right Atrium
Left Atrium

Inferior Chambers:
Right Ventricle
Left Ventricle

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11
Q

What is the purpose of cardiac valves?

A

Prevent the back flow of blood

Keep blood moving in a forward direction

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12
Q

What are the two classes of cardiac valves?

A 
Atrioventricular valves (AV Valves)
Semilunar Valves
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13
Q

What are the two atrioventricular valves?

A

Right Atrioventricular Valve (Tricuspid Valve)
Left Atrioventricular Valve (Bicuspid Valve)

Always “tri” to do the “right” thing

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14
Q

What are the two semilunar valves?

A

Pulmonary/Pulmonic Valve

Aortic Valve

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15
Q

When blood is flowing from the atria to the ventricles, what valves are open?

A

The atrioventricular valves (tricuspid & bicuspid)

The semilunar valves are closed (pulmonic and aortic)

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16
Q

When blood is flowing from the ventricles to the lungs and body, what valves are open?

A

The semilunar valves (pulmonic and aortic)

The atrioventricular valves are closed (tricuspid & bicuspid)

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17
Q

In order, list the structures that blood flows through in the heart

A 
Inferior/Superior Vena Cava »
Right Atrium » 
Tricuspid Valve » 
Right Ventricle » 
Pulmonic/Pulmonary Valve » 
Pulmonary Artery » 
Lungs (oxygenation occurs) » 
Pulmonary Veins » 
Left Atrium » 
Mitral Valve » 
Left Ventricle » 
Aortic Valve » 
Aorta »
Body Tissue/Organs
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18
Q

The only vein within the body that carrys oxygenated blood is what?

A

Pulmonary vein

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19
Q

The only artery within the body that carrys deoxygenated blood is what?

A

Pulmonary artery

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20
Q

Which cardiac chamber has the greatest workload & greatest demand? Because of this, what can result?

A

Left ventricle

It can fail first if overworked too long

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21
Q

It is vital for electrolytes to be in appropriate range for which cardiac system to run effectively?

A

Cardiac Electrical System / Cardiac Conduction Pathway

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22
Q

Name the parts of the Cardiac Conduction Pathway in order

A
  1. Sinoatrial (SA) Node
  2. Interatrial Node/Pathway/Bundle (Bachmann’s Bundle)
  3. Atrioventricular (AV) Node
  4. Bundle of His
  5. Right and Left Bundle Branches
  6. Purkinje Fibers
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23
Q

Where is the Sinoatrial Node located?

A

In the wall of the right Atrium

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24
Q

The rate of the Sinoatrial Node is dictated by what?

A

The needs of the body

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25
Q

Which part of the Cardiac Conduction Pathway is known as the “pacemaker” of the heart?

A

Sinoatrial Node

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26
Q

If the Sinoatrial Node fails, which part of the Cardiac Conduction Pathway will initiate a heartbeat? What is the rate?

A

Atrioventricular Node at a rate of 40 to 60 beats per minute

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27
Q

One cycle of cardiac activity can be divided into what two phases?

A

Systole and Diastole

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28
Q

Define systole

A

Systole is when the chambers are contracting (squeezing)

Blood is being pushed from the chambers

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29
Q

Define diastole

A

Diastole is when the chambers are relaxing (filling with blood)
Blood is filling into the chambers

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30
Q

While systole is happening with one set of chambers, what is happening with the other set of chambers?

A

Diastole

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31
Q

If the right atrium is in systole, what other chamber is in systole?

A

Left atrium

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32
Q

If the right atrium is in diastole, what other chamber is in diastole?

A

Left atrium

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33
Q

If the left atrium is in diastole, what other chamber is in diastole?

A

Right atrium

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34
Q

If the left atrium is in systole, what other chamber is in systole?

A

Right atrium

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35
Q

If the right ventricle is in systole, what other chamber is in systole?

A

Left ventricle

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36
Q

If the right ventricle is in diastole, what other chamber is in diastole?

A

Left ventricle

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37
Q

If the left ventricle is in diastole, what other chamber is in diastole?

A

Right ventricle

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38
Q

If the left ventricle is in systole, what other chamber is in systole?

A

Right ventricle

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39
Q

What is occurring during atrial systole?

A

Atria are contracting, squeezing blood out
Atrioventricular valves (tricuspid & bicuspid) are open, allowing blood to flow from atria to ventricles
Ventricles are in diastole, filling with blood sent from atria
Semilunar valves (pulmonic & aortic) are closed, to keep blood in ventricles

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40
Q

What is occurring during atrial diastole?

A 
Atria are relaxing & filling (blood is flowing from the body via inferior and superior vena cava)
Atrioventricular valves (tricuspid & bicuspid) are closed, to keep blood in the atria
Ventricles are in systole, contracting and squeezing blood into the lungs and body
Semilunar valves (pulmonic & aortic) are open, allowing blood to flow out of the ventricles
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41
Q

What is occurring during ventricular systole?

A

Ventricles are contracting, squeezing blood out
Semilunar valves (pulmonic & aortic) are open, allowing blood to flow out of the ventricles
Atria are relaxing & filling (blood is flowing from the body via inferior and superior vena cava)
Atrioventricular valves (tricuspid & bicuspid) are closed, to keep blood in the atria

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42
Q

What is occurring during ventricular diastole?

A

Ventricles are relaxing, filling with blood from the atria
Semilunar valves (pulmonic & aortic) are closed, to keep blood in ventricles
Atria are contracting, squeezing blood out
Atrioventricular valves (tricuspid & bicuspid) are open, allowing blood to flow from atria to ventricles

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43
Q

Heart sounds are made from what?

A

Closure of valves

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44
Q

The first heart sound heard, S1, known as the “lubb” sound, is made from what?

A

Closure of the atrioventricular valves

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45
Q

The second heart sound heard, S2, known as the “dubb” sound, is made from what?

A

Closure of the semilunar valves

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46
Q

What is the equation for cardiac output?

A

Cardiac Output = Stroke Volume * Heart Rate

CO = SV * HR

47
Q

What are the units of measurement for cardiac output?

A

mL/min
or
L/min

48
Q

What is stroke volume? What are its units of measurement?

A

The amount of blood pumped out of the left ventricle in one beat
mL/beat

49
Q

What is heart rate? What are its units of measurement?

A

The number of times the heart beats in one minute

beats/minute

50
Q

If the heart rate begins to increase, but stroke volume remains the same, will cardiac output:
increase, decrease, remain the same?

A

Increase

51
Q

If stroke volume begins to decrease, what must happen in the body in order for the cardiac output to remain unchanged?

A

Heart rate must increase

52
Q

Define preload

A

The amount of pressure stretching the ventricle at the end of ventricular diastole

53
Q

Define afterload

A

The amount of resistance the heart/left ventricle must overcome to open the aortic valve and push the blood out in to systemic circulation

54
Q

If afterload (i.e. systemic vascular resistance) is increased, what must increase to keep up with body’s demands?

A

Cardiac workload

The heart has to work harder to overcome the resistance and push the blood into circulation

55
Q

Define ejection fraction

A

Total amount of blood the left ventricle pumps out with each contraction

56
Q

Ejection fraction is measured in what unit of measurement?

A

Percentage

57
Q

Normal range for ejection fraction for a healthy adult?

A

55% to 70%

58
Q

What does the following phrase mean:

“Ejection fraction of 65%”

A

65% of the total amount of blood in the left ventricle is being pumped out with each contraction/squeeze of the ventricle

59
Q

If an ejection fraction is less than 40%, what may be present?

A

Heart failure

60
Q

What test is performed to determine the ejection fraction?

A

Echocardiogram

61
Q

What affect does epinephrine and norepinephrine have on the heart?

A

Activates beta one receptors

Increases heart rate
Increases force of cardiac contraction
Increases cardiac output
Dilates coronary vessels
Blood pressure increases due to increased cardiac output
62
Q

How does aldosterone work?

A

Tells the kidneys to hold on to sodium & release potassium
When sodium is retained, fluid follows
This increases intravascular volume within the body, thus increasing blood pressure

63
Q

What organ regulates the Renin-Angiotensin-Aldosterone System?

A

Kidneys

The kidneys will release renin to activate RAAS

64
Q

What conditions would cause the kidneys to activate the Renin-Angiotensin-Aldosterone System?

A

Decreased blood flow to the kidneys (decreased renal perfusion/renal ischemia)
Decreased arterial blood pressure (i.e. hypotension)
Decreased blood volume
Decreased serum sodium (hyponatremia)
Increased urine sodium

65
Q

What is the purpose of the Renin-Angiotensin-Aldosterone System?

A

To retain sodium, thus retaining fluid
Increasing blood volume & increasing blood pressure
Increasing serum sodium levels
Increase renal perfusion

66
Q

What are the steps of the Renin-Angiotensin-Aldosterone System?

A
  1. Kidneys release Renin
  2. Renin meets up with Angiotensinogen (which comes from the liver)
  3. Chemical reaction occurs between Renin & Angiotensinogen –> Angiotensin I is created
  4. Angiotensin Converting Enzyme (which comes from the lungs) converts Angiotensin I to Angiotensin II
  5. Angiotensin II promotes vasoconstriction of the arteries/arterioles
  6. Angiotensin II acts on the adrenal cortex, releasing aldosterone
  7. Aldosterone acts on the kidneys to retain sodium
  8. Retention of sodium causes fluid to be retained & potassium to be excreted
  9. Blood volume increases, blood pressure increases, renal perfusion increases, serum sodium levels increases
  10. When blood pressure is an appropriate level, the kidneys will stop releasing Renin and will stop RAAS
67
Q

List what occurs within the cardiovascular system as a person ages

A 
Atherosclerosis
Resting blood pressure increases
Left ventricle workload increases, causing the heart muscle to become less efficient
Vein valves are less competent
Resting heart rate decreases
Dysrhythmias are common
Heart sounds are distant due to kyphosis
68
Q

If a patient presents with complaints of dizziness, fatigue, and chest tightness, what are the first assessments the RN should do?

A

Assess vital signs
Assess heart rhythm
Pain
Dyspnea, SOB

69
Q

The nurse knows if blood pressure is taken on the leg, the reading will be..

A

About 10 mmHg higher

70
Q

A nurse takes a blood pressure in both arms, which blood pressure is recorded? The higher or lower?

A

Higher blood pressure should be recorded

71
Q

What is the purpose of a heart rate reading on the pulse oximeter?

A

To compare with a radial or apical heart rate, this determines if the pulse oximeter is accurate or not.

72
Q

The student nurse assesses a radial pulse and it is 59 bpm. What do they do?

A

Take an apical pulse for a minute.

73
Q

What is the purpose of palpating a pulse?

A

To assess volume and pressure quality

74
Q

A pulse is palpated and the finding is “normal.” How is this documented?

A

Strong, 2+

75
Q

When assessing the right radial pulse, the nurse should also do what…?

A

Assess the left radial pulse. Assess for equality

76
Q

Before performing orthostatic vitals, the nurse should gather what supplies?

A

A gait belt, possibly a partner for safety measures

77
Q

Before performing orthostatic vitals, the nurse should ask what?

A

Ask about current dizziness

78
Q

What are normal blood pressure and heart rate variations when body position is changed?

A

Systolic BP decreases up to 15 mmHg
Diastolic BP decreases up to 10 mmHg
HR increases up to 20 bpm

79
Q

What vital sign changes indicate orthostatic hypotension is present?

A

Systolic BP decreases greater than 15 mmHg
Diastolic BP decreases greater than 10 mmHg
HR increases greater than 20 bpm

80
Q

What must the nurse ask with each position change when performing orthostatic vital signs?

A

Ask about feeling dizzy/lightheaded

81
Q

Why may a patient have orthostatic hypotension?

A

Dehydrated
Analgesic medication
Pain

82
Q

When does dependent rubor occur

A

When there is decreased arterial blood flow to the lower extremities

83
Q

If a patient has decreased arterial blood flow to the lower extremities, what position should be encouraged?

A

Keep legs in the dependent position

Avoid elevating legs above the level of the heart, this will decrease blood flow

84
Q

If a patient has venous blood flow problems to the lower extremities, what color will appear?

A

Brown discoloration, purple skin, possible cyanosis when in the dependent position

85
Q

If venous blood flow problems of the lower extremities are present, what position should be encouraged?

A

Elevation of extremities above the heart

86
Q

When does a cardiac murmur present?

A

When a cardiac valve doesn’t close completely

87
Q

If heart sounds are distant, what position can the patient be placed in?

A

Lean the patient forward or on their left side

88
Q

A capillary refill < 3 seconds indicates what?

A

Appropriate arterial blood flow & oxygenation to the extremities

89
Q

A capillary refill > 3 seconds indicated what?

A

A decrease in arterial blood flow & oxygenation to the extremities

90
Q

What are the six P’s in a neurovascular assessment?

A 
Pain
Paresthesia
Pallor
Pulselessness
Paralysis
Poikilothermia
91
Q

What is cardiac monitoring? What can it detect?

A

Continuous monitoring of cardiac activity

It can detect changes in heart rate and heart rhythm immediately

92
Q

When will a cardiac monitor be ordered?

A

If a patient has cardiac complaints
If a patient is receiving medications that can change cardiac activity
When a patient is acutely ill
When a patient is experiencing electrolyte imbalances
When a patient is receiving IV electrolyte replacement

93
Q

A typical cardiac monitor has how many leads?

A

5

94
Q

What does EKG/ECG stand for?

A

Electrocardiogram

95
Q

What abnormalities can an Electrocardiogram identify?

A 
Issues with:
Cardiac conduction
Heart rate
Heart rhythm
Heart chamber enlargement
Myocardial ischemia/infarction
Electrolyte imbalances
96
Q

What is a Holter monitor?

A

A portable/ambulatory electrocardiogram

97
Q

What education is given with a Holter monitor?

A

If a patient feels any cardiac related symptoms, they must push the “event” button
Wear loose clothing
Only sponge bathe

98
Q

What is an Echocardiogram?

A

Ultrasound of the heart

99
Q

What does an Echocardiogram record/determine?

A

Determines the ejection fraction
Determines blood flow through the heart
Shows heart size, heart shape, heart position
Shows motion of heart chambers and valves

100
Q

What is the most concerning cardiac lab?

A

An elevated troponin.

Shows acute myocardial damage

101
Q

When is a cardiac troponin elevated?

A

During acute myocardial damage/ischemia

102
Q

Other than a troponin, what elevation of what lab can show injury to cardiac muscle?

A

Creatine Kinase MB (CK-MB)

103
Q

When is Brain Natriuretic Peptide (BNP) measured?

A

To identify and monitor individuals with congestive heart failure
To determine cause of SOB: cardiac (CHF) or pulmonary

104
Q

Elevation of what labs can put a patient at risk for developing coronary artery disease (CAD)?

A

LDL
Total Cholesterol
Triglycerides

105
Q

What is atherosclerosis

A

Plaque build up within arteries of the body

106
Q

What is coronary artery disease

A

Plaque build up within the coronary arteries
Narrowed coronary arteries
Decreased blood flow and oxygen delivery to cardiac tissue

107
Q

What therpeutic measures can be taken to improve cardiovascular health?

A

Improve diet
Exercise
Smoking cessation
Wear compression stockings

108
Q

Coronary artery disease can lead to what issues?

A

Angina
Myocardial infarction
Sudden death

109
Q

What are modifiable risk factors for coronary artery disease?

A 
Excessive alcohol use
Obesity
Sedentary lifestyle
Emotional stress
Tobacco use
110
Q

What medications can be prescribed to help with coronary artery disease?

A 
Antiplatelet aggregator (Aspirin, Plavix)
Lipid lowering agent (Statins)
111
Q

What lifestyle changes should be made to improve coronary artery disease?

A

Smoking cessation
Alcohol cessation
Low cholesterol diet & decreased saturated fats
Increase exercise

112
Q

What is a normal BNP level?

A

<100 pg/nL

113
Q

If BNP is elevated >400 pg/mL, what is the likely cause?

A

Heart failure

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