Unit 8 Flashcards

1
Q

A patient presents to the CCU with chest pain made worse by breathing deeply or lying supine, dyspnea, malaise, fever, and elevated blood cell count. On reviewing his medical chart, the nurse observes that the patient had a myocardial infarction almost 2 months ago. What does the nurse suspect the patients condition to be?

A) Dresslers syndrome

B) Dilated cardiomyopathy

C) Hypertrophic cardiomyopathy

D) Buergers disease

A

a

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2
Q

A 20-year-old competitive swimmer was recently admitted to the CCU and diagnosed with myocarditis. The nurse is counseling the patient and her family regarding what this diagnosis means. What should the nurse mention? Select all that apply.

A) Corticosteroids are effective in changing the clinical course of this disease.

B) Immunosuppressive agents are effective in changing the clinical course of this disease.

C) Some cases of myocarditis resolve without further sequelae.

D) The patient will need to withdraw from training and competition for at least 6 months.

E) The disease is potentially lethal and often has no cure.

F) The disease may require heart transplantation.

A

C D E F

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3
Q

A patient in the CCU presents with endocarditis. This patient is 40 years old, a smoker, had rheumatic heart disease as a child, and is obese. Which characteristics of this patient are risk factors for endocarditis?

A) Age

B) Smoking status

C) History of rheumatic heart disease

D) Obesity

A

C

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4
Q

A patient in the CCU has an obstruction in his coronary arteries that is resulting in oxygen levels that are inadequate to meet the metabolic demands of his myocardial cells. He is exhibiting symptoms of left ventricular heart failure. Which disease does he most likely have?

A) Ischemic cardiomyopathy

B) Nonischemic cardiomyopathy

C) Endocarditis

D) Peripheral vascular disease

A

A

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5
Q

A patient in the CCU is experiencing a cramping pain in the buttocks whenever she stands. The nurse also observes that the patients nails on both hands are thick and her skin dry. The nurse recognizes this condition as which of the following?

A) Deep vein thrombosis

B) Abdominal aortic aneurysm

C) Peripheral arterial disease

D) Thoracic aortic aneurysm

A

C

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6
Q

A patient in the CCU has been confined to bed rest for 3 weeks. The patient is obese, is on warfarin, and has a peripherally inserted central catheter (PICC). Which of the following are causative factors for thrombophlebitis in this patient? Select all that apply.

A) Bed rest

B) Obesity

C) Presence of a PICC

D) Warfarin

E) Insulin

A

A C

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7
Q

The nurse observes a balloon-shaped outpouching on the abdomen of a cardiac patient in the CCU. The nurse recognizes this as which of the following?

A) Fusiform aneurysm

B) False aneurysm

C) Saccular aneurysm

D) Thoracic aneurysm

A

C

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8
Q

A patient in the CCU has an abdominal aortic aneurysm that is 7 cm in diameter. The nurse recognizes that which of the following is the most appropriate treatment for this patient?

A) Anticoagulant therapy

B) Heart transplant

C) Genetic screening and counseling

D) Surgical repair

A

D

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9
Q

A pregnant patient in the CCU who recently was in a motor vehicle accident suddenly complains of an intense chest pain that she describes as ripping before passing out. On auscultation, the nurse hears the murmur of aortic regurgitation. What condition does the woman most likely have?

A) Thoracic aortic aneurysm

B) Aortic dissection

C) Hypertrophic cardiomyopathy

D) Hypertensive crisis

A

B

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10
Q

. An elderly man presents to the CCU with a blood pressure reading of 190/125, severe headache, visual disturbances, and bleeding from his eyes. The nurse recognizes this condition as which of the following?

A) Pericarditis

B) Endocarditis

C) Dilated cardiomyopathy

D) Hypertensive crisis

A

D

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11
Q

The patient was admitted with an acute myocardial infarction several days ago and is now complaining of severe midsternal chest pain at rest and dyspnea. The pain is constant, more severe when the patient lies down, and unaffected by medications. What is the best nursing intervention?

A) Obtain cardiac marker blood tests to assess for reinfarction.

B) Auscultate for pericardial and pleural friction rubs.

C) Auscultate for new onset of S3 heart sound.

D) Prepare the patient for cardiac catheterization.

A

B

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12
Q

A patient has been diagnosed with pericarditis. Which assessment changes unique to pericarditis would the nurse expect to find?

A) New onset of S3 gallop

B) Severe chest pain at rest

C) Diffuse ST segment elevation on ECG

D) Prolonged, irregular PR intervals on ECG

A

C

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13
Q

A patient with mitral valve prolapse has been admitted to the CCU with probable infectious endocarditis. What physical changes unique to infectious endocarditis will the nurse be most likely to find?

A) Track marks on arms following peripheral veins

B) New onset of or change in cardiac murmur

C) Severe midsternal crushing chest pain with activity

D) Fever, tachycardia, and general malaise

A

B

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14
Q

A patient is admitted with complications and exacerbation of symptoms from dilated cardiomyopathy. Which easily treated factor might account for the change in the patients condition?

A) Viral illness before the original diagnosis

B) Acute myocardial infarction

C) Chronic alcohol abuse

D) Persistent vegetative growth on valves

A

C

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15
Q

A young adult collapses during a sporting event. Cardiopulmonary resuscitation is successful, and the patient is admitted with a diagnosis of possible hypertrophic cardiomyopathy. What nursing assessment is a priority for this patient?

A) Cardiac monitor pattern and pulse oximetry

B) Evaluation for dyspnea and heart murmur

C) Level of consciousness and mental status evaluation

D) History of recent viral illness or alcohol abuse

A

B

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16
Q

A patient is being treated for hypertrophic cardiomyopathy. During discharge teaching, what is the most important information to include?

A) Cessation of alcohol abuse will improve cardiac function.

B) Only a heart transplant is associated with increased longevity.

C) Make an appointment for genetic screening and counseling.

D) Information about anti-infective medications

A

C

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17
Q

A patient with chronic arteriosclerotic disease complains of severe pain in the calf, foot, and ankle, followed by numbness. If the patient has an embolus of the lower extremity arteries, what additional physical sign will the nurse find?

A) History of claudication

B) Black tips of toes

C) No foot pulses on affected foot

D) Bilateral cool skin on lower extremities

A

C

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18
Q

A patient is diagnosed with Buergers disease. What would be the most important teaching for this patient?

A) Information about anti-inflammatory medications

B) Importance of protecting the extremities from cold

C) Rationale for quitting smoking

D) Anticoagulant therapy precautions

A

C

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19
Q

A patient is critically ill in the CCU and is on complete bed rest. What strategy should the nurse use to prevent phlebitis leading to thromboembolism?

A) Repeated attempts to insert intravenous catheters

B) Maintain overall blood volume slightly low

C) Maintain complete bed rest

D) Passive exercises of lower extremities

A

D

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20
Q

A patient is admitted for repair of an abdominal aortic aneurysm and begins to complain of severe abdominal pain and a sense of impending doom. What assessment should the nurse perform first?

A) Blood pressure

B) Respiratory rate

C) Auscultation of heart sounds

D) Pain scale

A

A

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21
Q

A patient with a history of hypertension has been admitted for surgical repair of a thoracic aneurysm. What symptom would indicate probable acute dissection of the aneurysm?

A) Nonspecific mild chest pain

B) Absence of cardiac murmur

C) Wide mediastinum on chest x-ray

D) Equal radial pulses at normal intensity

A

C

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22
Q

A patient has been admitted with hypertensive crisis and is experiencing headache, visual disturbances, confusion, nausea, papilledema, and oliguria. The patient has been started on an intravenous vasodilator to reduce his blood pressure quickly. What is the priority nursing assessment?

A) Protection of safety with side rails and restraints

B) Continuous blood pressure monitoring by arterial catheter

C) Response to pain and nausea medications

D) Insertion of nasogastric tube to intermittent suction

A

B

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23
Q

A critical care nurse is caring for a client in a hypertensive crisis. Blood pressure is being reduced slowly. If the blood pressure is lowered too much too quickly, what is the patient is at risk for?

A) A myocardial infarction

B) A cerebral infarction

C) Renal failure

D) All of the above

A

C

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24
Q

A patient in the CCU with chronic heart failure is prescribed an ACE inhibitor. What side effects should the nurse mention to him? Select all that apply.

A) Angioderma

B) Cough

C) Rebound tachycardia

D) Hyperkalemia

E) Night sweats

F) Anxiety

A

A B D

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25
Q

A CCU nurse who works frequently with cardiac patients is putting together a teaching plan to follow when she instructs these patients on how to live with heart failure. Which points should she include in this plan? Select all that apply.

A) Discontinue medications once you are feeling better, to avoid adverse effects.

B) Take your medications about the same time every day.

C) Avoid pepper and spices.

D) Remove the saltshaker from your table.

E) The best time to weigh yourself is in the afternoon.

F) Try to perform 15 to 20 minutes of continuous activity each day.

A

B D F

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26
Q

A patient with chronic cardiac failure in the CCU is on an ACE inhibitor but still has significant pitting edema in his extremities. Which medication, in addition to the ACE inhibitor, is the physician likely to prescribe to this patient?

A) Digoxin

B) A loop diuretic

C) b-blocker

D) Calcium channel blocker

A

B

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27
Q

A patient presents to the CCU with acute, decompensated heart failure. The nurse observes that this patient has chronic obstructive pulmonary disease and hypotension. She eats a low-sodium diet and drinks alcohol excessively. Which of the following are contributing factors to this patients heart failure? Select all that apply.

A) Chronic obstructive pulmonary disease

B) Hypotension

C) Low-sodium diet

D) Excessive alcohol intake

A

A

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28
Q

A patient is in the CCU with dilated cardiomyopathy and asymptomatic right-sided chronic heart failure. What finding will the nurse most likely discover in her assessment of this patient?

A) Mitral regurgitation murmur

B) Cheyne-Stokes respiratory pattern

C) Unilateral crackles

D) Rales

A

A

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29
Q

A nurse in the CCU must assess a cardiac patients fluid status. Which of the following is the best method for him to use?

A) Having the patient measure and record all liquids taken in and all urine excreted

B) Weighing the patient daily

C) Pulse oximetry

D) Radionuclide ventriculography

A

B

30
Q

A patient presents to the CCU with shortness of breath on exertion. Which diagnostic study would be best for ruling out pneumonia or COPD as the cause of the patients symptoms?

A) Echocardiography

B) Radionuclide ventriculography

C) Pulse oximetry

D) Chest radiography

A

D

31
Q

A patient in the CCU with chronic heart failure experiences shortness of breath even when at rest. When he stands up and walks across the room, his shortness of breath worsens. Which class of heart failure does this patient exhibit, according to the New York Heart Association (NYHA) Functional Classification of Heart Failure?

A) Class I

B) Class II

C) Class III

D) Class IV

A

D

32
Q

A patient in the CCU has clear evidence of structural heart failure, as he lacks contractility in his left ventricle and his ejection fraction is only 37%. However, he has never shown any signs or symptoms of heart failure. According to the American College of Cardiology (ACC)/American Heart Association (AHA) Guidelines for Stages of Heart Failure, which stage of heart failure best characterizes this patients condition?

A) Stage A

B) Stage B

C) Stage C

D) Stage D

A

B

33
Q

A patient presents to the CCU with cardiac heart failure resulting from atrial tachycardia. Which of the following explains how atrial tachycardia can cause heart failure?

A) Premature ventricular beats leading to sudden death

B) Increase in muscle mass in ventricle

C) Pulmonary embolus leading to acute right-sided heart failure

D) Shortened diastole leading to decreased filling and diastolic dysfunction

A

D

34
Q

The nurse is caring for a patient who has been admitted with a diagnosis of heart failure. What does the term heart failure mean?

A) It is characterized by rales and alveolar edema.

B) It results from damage caused by acute myocardial infarction.

C) It is a general clinical syndrome with many etiologies.

D) All patients have similar symptoms

A

C

35
Q

A patient has been diagnosed with left ventricular heart failure. What physical findings would the nurse expect?

A) Enlarged liver

B) Peripheral edema

C) Pulmonary rales

D) Enlarged spleen

A

C

36
Q

An elderly patient with uncontrolled hypertension and atrial fibrillation with rapid ventricular response is admitted with a diagnosis of heart failure. He has crepitant pulmonary rales and his chest x-ray shows pulmonary congestion. The patient probably has what type of heart failure?

A) Left ventricular systolic failure

B) Left ventricular diastolic failure

C) Right ventricular failure

D) Combination heart failure

A

B

37
Q

A patient has been admitted with acute left systolic heart failure secondary to acute myocardial infarction. The patient has dyspnea and orthopnea and a cardiac rhythm of sinus tachycardia. The physiologic dysfunction for this type of heart failure is what?

A) Impaired contractility of the left ventricle

B) Impaired compliance of the left ventricle

C) Cardiac valve disease

D) Acute myocardial infarction

A

A

38
Q

A patient has been admitted with right heart failure. The physiologic basis of right heart failure is what?

A) Left heart failure

B) Impaired right cardiac output

C) Pulmonary hypertension

D) Acute pulmonary embolus

A

B

39
Q

A patient has been diagnosed with acute left heart failure secondary to acute myocardial infarction and increased afterload. What changes in assessment findings does the nurse expect to find?

A) Elevated pulmonary capillary wedge pressure

B) Normal or low blood pressure

C) Enlarged liver and spleen

D) Lungs clear to auscultation

A

A

40
Q

A patient with heart failure is being monitored with a pulmonary artery catheter to assess cardiac output and its components. What pattern of results would indicate a need for immediate intervention?

A) Heart rate, preload, contractility, and afterload are balanced and cardiac output is normal.

B) Heart rate is rapid, preload is reduced, contractility and afterload are normal, and cardiac output is reduced.

C) Heart rate is rapid, preload is high, contractility is high, afterload is low, and cardiac output is normal.

D) Heart rate is low, preload is high, contractility is high, afterload is low, and cardiac output is normal.

A

B

41
Q

A patient has been diagnosed with chronic heart failure, compensated. What symptoms would the nurse expect to find?

A) Frothy sputum progressing to pink frothy sputum

B) Severe hypotension when supine

C) Mild dyspnea on exertion or when supine

D) 4+ pitting edema of the lower extremities when dependent

A

C

42
Q

A patient with long-standing hypertension has a viral upper respiratory illness and is self-medicating with over-the-counter medications. The patient complains of severe dyspnea with activity and has new-onset crepitant rales and pitting edema of the lower extremities. In evaluating the patients medications, what medication should the nurse look for in particular?

A) Furosemide (Lasix)

B) Nonsteroidal anti-inflammatory medications (NSAIDs)

C) Hydrochlorothiazide diuretic (HCTZ)

D) Angiotensin-converting enzyme (ACE) inhibitor

A

B

43
Q

A patient with heart failure is being discharged. What discharge instruction should the nurse emphasize most?

A) Date and time of next medical appointment

B) Dietary alterations to reduce sodium intake

C) Structured exercise program

D) Maintaining weight within 1 to 2 pounds

A

D

44
Q

For a patient with heart failure, maintenance of a steady weight is an important goal. The nurse should teach the patient that which of the following is the most accurate method for monitoring fluid volume changes?

A) Intake and output, with 24-hour totals and trends

B) Daily weight at the same time every day

C) Daily assessment of peripheral edema

D) Periodic assessment of serum electrolyte values

A

B

45
Q

A patient with heart failure has been started on an ACE inhibitor. What lab value related to the ACE inhibitor would concern the nurse?

A) Elevated serum potassium

B) Elevated CK-MB

C) Diminished sodium

D) Increased prothrombin time

A

A

46
Q

A patient receiving an ACE inhibitor has a blood pressure of 85/50 mm Hg. The patient is asymptomatic otherwise. What is the best nursing action?

A) Hold the medication because the blood pressure is too low.

B) Recheck the blood pressure in 1 hour.

C) Administer the medication because the patient is asymptomatic.

D) Reschedule time of medication administration to hour of sleep.

A

C

47
Q

The patient is prescribed hydralazine and a nitrate for management of heart failure. The patient tells the nurse he has trouble taking medications that must be taken several times a day. What intervention will be the most helpful to the patient?

A) Stress the importance of taking medications as prescribed.

B) Ask the physician to change his therapy to long-acting medications that can be taken less often.

C) Ask the physician to change his therapy to other drug classes at the same frequencies.

D) Inform the physician that the patient is not taking his prescribed medications

A

B

48
Q

A patient with heart failure is taking an ACE inhibitor and a diuretic as prescribed but continues to be symptomatic. What patient behavior would explain lack of achievement of therapeutic goals?

A) Exercises regularly (walking and water aerobics)

B) Diet of mostly canned food and soda pop

C) Does not drink any alcoholic beverages

D) Takes medications as prescribed

A

B

49
Q

A patient with heart failure comes to the clinic for a routine monitoring visit. What findings would indicate achievement of therapeutic goals?

A) Lungs have crepitant rales.

B) Complains of dyspnea on exertion

C) Has pitting edema of lower extremities

D) Weight is within 2 pounds of ideal weight

A

D

50
Q

A patient is recovering in the CCU following carotid endarterectomy. What intervention should the nurse make to ensure that a hematoma is not forming in the patients neck?

A) Assess neck size by comparing operative side with nonoperative side.

B) Monitor pupil reactivity.

C) Assess hand grip.

D) Monitor blood pressure.

A

A

51
Q

A patient who recently underwent carotid endarterectomy is exhibiting signs of stroke. Which intervention or interventions should the nurse take to assess this patients neurological function? Select all that apply.

A) Measure chest tube output.

B) Assess eye movement.

C) Monitor level of consciousness.

D) Assess urine output

A

B C

52
Q

A patient with left main coronary artery disease (CAD) experiences persistent angina. She would like to exercise more, but is limited by shortness of breath and angina. Her physician believes that she is a good candidate for coronary artery bypass graft. The nurse recognizes that which of the following are indications for coronary artery bypass graft (CABG) surgery in this situation?

A) Having left main CAD

B) Being a good candidate for angioplasty and stenting

C) Having persistent angina

D) Availability of new effective CAD medication

E) Limited exercise tolerance

F) The patients spouse was successfully treated with CABG

A

A C E

53
Q

A patient in the CCU is recovering from coronary artery bypass graft (CABG) surgery. He has had multiple graft surgeries in the past. For this latest surgery, the patients radial artery was used in the graft. What complication should the nurse most expect to observe in this patient?

A) Occlusion

B) Infection

C) Arterial spasm

D) Internal hemorrhaging

A

C

54
Q

A patient is recovering in the CCU following off-pump coronary artery bypass graft (OPCABG) surgery involving the internal mammary artery graft. What nursing intervention is most important for the first 48 hours following surgery for this patient?

A) Administration of anticoagulant therapy

B) Administration of calcium channel blockers

C) Monitoring of fluid status

D) Assessment for hematoma

A

A

55
Q

A patient with moderate mitral stenosis with minimal calcification and regurgitation is preparing to have surgery. Which procedure would be most appropriate to restore normal function to this patient?

A) Annuloplasty

B) Valve replacement with biological valve

C) Valve replacement with caged ball valve

D) Commissurotomy

A

D

56
Q

A patient recovering from cardiopulmonary bypass surgery is shivering. For what reason should the nurse be concerned about the shivering?

A) Shivering is a sign of cardiogenic shock

B) Shivering is a sign that the patient has a fever

C) Shivering increases myocardial workload

D) Shivering can cause sutures to rupture

A

C

57
Q

A patient recovering in the CCU following coronary artery bypass graft (CABG) surgery complains of pain in his chest. The patient underwent a sternotomy incision during the surgery. Which of the following types of pain would indicate anginawhich may indicate graft failureas opposed to typical pain resulting from the sternotomy?

A) Radiates to arms

B) Is worse with deep breathing

C) Is worse with movement

D) Is sharp

A

A

58
Q

A patient in the CCU is experiencing premature atrial contractions following coronary artery bypass graft surgery. Which of the following would be the most appropriate nursing intervention?

A) Administration of anticoagulants

B) Administration of potassium and magnesium

C) Administration of dopamine

D) Administration of epinephrine

A

B

59
Q

A patient who underwent carotid endarterectomy is being discharged from the CCU. Which of the following instructions should the nurse give to the patient?

A) Avoid rotating your head.

B) Bruising and discoloration of the neck are not normal and should be reported immediately.

C) Eat a low-fat diet.

D) Avoid washing the incision site.

A

C

60
Q

A patient with severe coronary artery disease is scheduled for coronary artery bypass graft surgery. As part of the preoperative teaching, the nurse explains the surgery. Which of the following statements about this procedure is true?

A) The diseased artery will be removed and replaced with a graft from another artery.

B) A piece of the saphenous vein will be used to go around the diseased part of the artery.

C) After removal of the diseased artery, the remaining ends will be anastomosed.

D) The wall of the heart will be incised to create a new pathway for blood flow.

A

B

61
Q

The patient is scheduled for coronary artery bypass surgery using the off-pump technique. During preoperative teaching, the nurse explains that using the off-pump procedure has what advantage over the on-pump procedure?

A) There is a lower risk of a cerebral embolus.

B) The patient can anticipate a shorter hospital stay.

C) There will be less need for anticoagulation therapy.

D) The procedure will be less painful.

A

B

62
Q

A patient with severe coronary artery disease has persistent angina that is refractory to medical management at maximum drug doses and has severe compromise of activities of daily living from the angina. The patient has had several coronary artery bypass surgeries and has been told that he is not a candidate for any further surgeries or percutaneous interventions such as stents. In discussing options for further therapy, what should the nurse include that would offer the patient the most hope?

A) Unless a new medication is invented, there is nothing that can be done.

B) Discussion of hospice and palliative support for end-of-life care

C) Referral to the social worker for financial assistance

D) Referral to the transmyocardial laser revascularization program for evaluation

A

D

63
Q

The patient has been diagnosed with severe mitral valve stenosis. What physical changes would the nurse expect to find as a result of the stenosis?

A) Prolonged capillary refill

B) Normal left atrial and ventricular pressures

C) Clear lung sounds

D) Angina pectoris

A

A

64
Q

The patient has been diagnosed with mitral valve insufficiency and left ventricular hypertrophy. What effect would the nurse expect from the left ventricular hypertrophy?

A) Improved cardiac output from increased left ventricular contractility

B) No appreciable signs or symptoms or effects until late in the disease process

C) A more obvious and easier-to-auscultate mitral valve regurgitant murmur

D) Early onset of pulmonary edema and right-sided congestive heart failure

A

C

65
Q

The patient has been diagnosed with severe aortic valve stenosis. Considering the most common symptoms caused by aortic valve stenosis, what is the most important nursing intervention?

A) Document characteristics of the aortic stenosis murmur.

B) Teach patient to rise slowly from a supine position.

C) Assess peripheral circulation more frequently.

D) Assess for and document pulmonary adventitious sounds

A

B

66
Q

. The patient has developed acute aortic valve insufficiency after experiencing blunt chest trauma. What symptom, if found by the nurse, is indicative of a counterproductive compensatory mechanism that should be treated?

A) Low cardiac output

B) Pulmonary edema

C) Elevated blood pressure

D) Aortic insufficiency murmur

A

C

67
Q

The patient has had coronary artery bypass surgery involving the cardiopulmonary bypass pump, systemic hypothermia, topical cardiac hypothermia, and cold cardioplegia. As a result of the various hypothermic therapies, numerous postoperative complications may ensue. What collaborative postoperative intervention is specifically directed at ameliorating one or more of these complications?

A) Use of intravenous pain and sedation medications

B) Mechanical ventilation and supplemental oxygen therapy

C) Vital signs every hour until stable or transferred to step-down unit

D) Management of mediastinal chest tube drainage

A

B

68
Q

The nurse is caring for a patient who has just had coronary artery bypass grafting. As part of the admission procedure to the critical care unit immediately after surgery, what nursing assessment has the highest priority?

A) Urine output

B) Cardiac index measurement

C) Chest tube drainage measurement

D) Core body temperature

A

B

69
Q

After coronary artery bypass surgery, the patient experiences significant fluid volume shifts and losses. What nursing assessment would be most indicative of fluid volume deficit?

A) Low central venous pressure

B) Urine output 40 mL/hr

C) Brisk capillary refill

D) Diminished core body temperature

A

A

70
Q

A patient who has just has coronary artery bypass surgery has developed tachycardia, a low-grade fever, and an elevated total white blood cell count. What additional sign or symptom would support the nurses suspicion of a postoperative infection?

A) Purulent drainage from the chest incision

B) Chest incision edges are red and swollen.

C) Elevated immature neutrophils or bands

D) Severe incisional pain with cough

A

A

71
Q

The nurse is caring for a patient who has just had coronary artery bypass grafting and is experiencing significant hypotension. What nursing assessment would best confirm that the hypotension is related to blood loss?

A) Low hemoglobin and hematocrit, with high central venous pressure

B) Chest tube drainage in excess of 200 mL/hr

C) Urine output 40 to 50 mL/hr

D) Chest tube drainage less than 30 mL/hr

A

B

72
Q
A