management of patients cardiac disorders

If a client were to develop rheumatic carditis, which cardiac structure would most likely be affected?

mitral valve In rheumatic carditis, cardiac structures that usually are affected include the heart valves (particularly the mitral valve), endocardium, myocardium, and pericardium.

During a teaching session, a client who is having a valuloplasty tomorrow asks the nurse about the difference between a mechanical valve replacement and a tissue valve. Which of the following answers from the nurse is correct information?

"A mechanical valve is thought to be more durable and so requires replacement less often." Mechanical valves are thought to be more durable than tissue valves and so require replacement less often. Tissue valves are less likely to generate blood clots and so long-term anticoagulation therapy is not required. Homografts (human valves) are not always available and are very expensive.

The nurse obtains a health history from a client with a prosthetic heart valve and new symptoms of infective endocarditis. Which question by the nurse is most appropriate to ask?

"Have you been to the dentist recently?" Invasive procedures, particularly those involving mucosal surfaces (e.g., those involving manipulation of gingival tissue or periapical regions of teeth), can cause a bacteremia, which rarely lasts more than 15 minutes. However, if a client has any anatomic cardiac defects or implanted cardiac devices (e.g., prosthetic heart valve, pacemaker, implantable cardioverter defibrillator), bacteremia can cause bacterial endocarditis.

The nurse determines that a 49-year-old client recently diagnosed with subacute bacterial endocarditis understands discharge teaching upon which client statement?

"I have to call my doctor so I can get antibiotics before seeing the dentist." Antibiotic prophylaxis is recommended for high-risk clients immediately before and sometimes after dental procedures.

A client with a confirmed DVT is being discharged from the ED. Which client statement indicates that the client has received proper nursing instruction and understands how to manage this condition?

"I need to do my leg exercises five times or more every hour." Exercise prevents venous stasis by promoting venous circulation, relieves swelling, and reduces pain. Promoting venous blood flow prevents the formation of thrombi and subsequent potential for emboli in the unaffected extremity. Bending the knees is contraindicated for a client with DVT because it interferes with venous circulation and may increase the size of the existing clot or contribute to the formation of additional thrombi. Clients with DVT should apply warm, moist compresses to the area of discomfort because warmth dilates blood vessels, improves circulation, and relieves swelling, all of which relieve discomfort; moist heat is more comforting than dry heat. Adequate fluid volume dilutes blood cells in plasma and reduces the risk for platelet aggregation.

A nurse is teaching a client who is awaiting a heart transplant. Which statement indicates the client understands what is required to help minimize rejection?

"I will need to take three different types of medications for the rest of my life to help prevent rejection." Clients who have had heart transplants are constantly balancing the risk of rejection with the risk of infection. They must adhere to a complex regimen of diet, medications, activity, follow-up laboratory studies, biopsies of the transplanted heart (to diagnose rejection), and clinic visits. Three classes of medications are prescribed for a transplant client to help minimize rejection: corticosteroids (e.g., prednisone), calcineurin inhibitors (tacrolimus, cyclosporin), and antiproliferative agents (mycophenolate mofetil, azathioprine, or sirolimus).

A nurse and a nursing student are performing a physical assessment of a client with pericarditis. The client has an audible pericardial friction rub on auscultation. When leaving the room, the student asks the nurse what causes the sound. The nurse's best response is which of the following?

"The pericardial surfaces lose their lubricating fluid because of inflammation and rub against each other." A pericardial friction rub occurs when the pericardial surfaces lose their lubricating fluid due to inflammation. The rub is audible on auscultation and is synchronous with the heartbeat. The layers of the heart never become loose from each other. The great vessels are not in contact with the inside of the pericardium, where the inflammation is located. The lungs have nothing to do with a pericardial friction rub.

A nurse is teaching a client about valve replacement surgery. Which statement by the client indicates an understanding of the benefit of an autograft replacement valve?

"The valve is made from my own heart valve, and I will not need to take any blood thinning drugs when I am discharged." Autografts (i.e., autologous valves) are obtained by excising the client's own pulmonic valve and a portion of the pulmonary artery for use as the aortic valve. Anticoagulation is unnecessary because the valve is the client's own tissue and is not thrombogenic. The autograft is an alternative for children (it may grow as the child grows), women of childbearing age, young adults, clients with a history of peptic ulcer disease, and people who cannot tolerate anticoagulation. Aortic valve autografts have remained viable for more than 20 years.

A patient was admitted to the hospital with a diagnosis of aortic regurgitation. On assessment, the nurse notes the following positive indicators for the disease process. Select all that apply.

+The presence of a diastolic murmur +The pulse has a rapid upstroke, then collapses +Visible neck vein pulsations Pulse pressure widens and systolic blood pressure in the lower extremities is higher than in the upper extremities as a result of progressive left ventricular failure.

A nurse plans to have an education session with a client with cardiomyopathy and the client's spouse about ways to increase activity tolerance. Which of the following instructions would provide that information?

Alternate active periods with rest periods. The client should plan activities to occur in cycles, alternating rest with active periods. The client with cardiomyopathy must avoid strenuous activity and isometric exercises. It is impossible to avoid all physical and emotional stress.

While assessing a patient with pericarditis, the nurse cannot auscultate a friction rub. Which action should the nurse implement?

Ask the patient to lean forward and listen again. The most characteristic sign of pericarditis is a creaky or scratchy friction rub heard most clearly at the left lower sternal border. Having the patient lean forward and to the left uses gravity to force the heart nearer to the chest wall, which allows the friction rub to be heard. These assessment data are not life-threatening and do not require a call to the health care provider. The nurse should try multiple times to auscultate the friction rub before deciding that the rub is gone. Chest tubes are not the treatment of choice for not hearing friction rubs.

Which describes a valve used in replacement surgery that is made from the client's own heart valve?

Autograft An example of an autograft is when the surgeon excises the pulmonic valve and uses it for an aortic valve replacement. An allograft, also called a homograft, refers to replacement using human tissue. Xenograft refers to animal tissue used in tissue replacement.

A nurse is caring for a client who had an aortic balloon valvuloplasty. The nurse should inspect the surgical insertion site closely for which complication(s)?

Bleeding and infection Possible complications of an aortic balloon valvuloplasty include aortic regurgitation, emboli, ventricular perforation, rupture of the aortic valve annulus, ventricular dysrhythmia, mitral valve damage, infection, and bleeding from the catheter insertion sites.

The nurse is caring for a patient diagnosed with pericarditis. What serious complication should this patient be monitored for?

Cardiac tamponade The inflammatory process of pericarditis may lead to an accumulation of fluid in the pericardial sac (pericardial effusion) and increased pressure on the heart, leading to cardiac tamponade (see Chapter 29).

Which nursing intervention should a nurse perform when a client with cardiomyopathy receives a diuretic?

Check regularly for dependent edema The nurse should regularly monitor for dependent edema if the client with cardiomyopathy receives a diuretic. Oxygen is administered either continuously or when dyspnea or dysrhythmias develop. Bed rest is not necessary. The nurse should ensure that the client's activity level is reduced and should sequence any activity that is slightly exertional between periods of rest.

The nurse determines that a patient has a characteristic symptom of pericarditis. What symptom does the nurse recognize as significant for this diagnosis?

Constant chest pain The most characteristic symptom of pericarditis is chest pain, although pain also may be located beneath the clavicle, in the neck, or in the left trapezius (scapula) region. Pain or discomfort usually remains fairly constant, but it may worsen with deep inspiration and when lying down or turning.

A client seeks medical attention for dyspnea, chest pain, syncope, fatigue, and palpitations. A thorough physical examination reveals an apical systolic thrill and heave, along with a fourth heart sound (S4) and a systolic murmur. Diagnostic tests reveal that the client has hypertrophic cardiomyopathy (HCM). Which nursing diagnosis may be appropriate?

Decreased Cardiac Output Decreased cardiac output is an appropriate nursing diagnosis for a client with HCM because the hypertrophied cardiac muscle decreases the effectiveness of the heart's contraction, decreasing cardiac output. Heart failure may complicate HCM, causing fluid volume excess; therefore, the nursing diagnosis of Risk for deficient fluid volume isn't applicable. Ineffective thermoregulation and Risk for peripheral neurovascular dysfunction are inappropriate because HCM doesn't cause these problems.

For a client with cardiomyopathy, the most important nursing diagnosis is:

Decreased cardiac output related to reduced myocardial contractility.

For a client with cardiomyopathy, the most important nursing diagnosis is

Decreased cardiac output related to reduced myocardial contractility. Decreased cardiac output related to reduced myocardial contractility is the greatest threat to the survival of a client with cardiomyopathy. Although Excess fluid volume, Ineffective coping, and Anxiety are important nursing diagnoses, the nurse can address them when the client has improved cardiac output and myocardial contractility.

A client with aortic regurgitation is admitted to the hospital. Which of the following assessment findings would indicate left ventricular failure?

Dyspnea, orthopnea, paroxysmal nocturnal dyspnea (PND) Signs and symptoms of progressive left ventricular failure include breathing difficulties, such as orthopnea and PND. Distended jugular veins, pedal edema, and nausea are signs and symptoms of right-sided heart failure

A client is admitted to the hospital with aortic stenosis. Which of the following assessment findings would indicate the development of left ventricular failure?

Dyspnea, orthopnea, pulmonary edema Signs and symptoms of progressive left ventricular failure include breathing difficulties, such as orthopnea, PND, and pulmonary edema. Distended jugular veins, pedal edema, and nausea are signs and symptoms of right sided heart failure.

A client is admitted to the hospital with possible acute pericarditis and pericardial effusion. The nurse knows to prepare the client for which diagnostic test to confirm the client's diagnosis?

Echocardiogram Echocardiography is useful in detecting the presence of pericardial effusions associated with pericarditis. An echocardiogram may detect inflammation, pericardial effusion, tamponade, and heart failure. It may help confirm the diagnosis.

The diagnosis of aortic regurgitation (AR) is confirmed by which of the following?

Echocardiography Diagnosis is confirmed by echocardiography. Cardiac catheterization is not necessary in most patients with AR. Exercise stress testing will assess functional capacity and symptom response. A myocardial biopsy may be performed to analyze myocardial tissue cells in patients with cardiomyopathy.

A client reporting heart palpitations is diagnosed with atrial fibrillation caused by mitral valve prolapse. To relieve the symptoms, the nurse should teach the client which dietary intervention?

Eliminate caffeine and alcohol To minimize symptoms of mitral valve prolapse, the nurse should instruct the client to avoid caffeine and alcohol. The nurse encourages the client to read product labels, particularly on over-the-counter products such as cough medicine, because these products may contain alcohol, caffeine, ephedrine, and adrenaline, which may produce arrhythmias and other symptoms. The nurse also explores possible diet, activity, sleep, and other lifestyle factors that may correlate with symptoms.

The nurse is auscultating the heart of a client diagnosed with mitral valve prolapse. Which is often the first and only manifestation of mitral valve prolapse?

Extra heart sound Often the first and only sign of mitral valve prolapse is identified when a physical examination of the heart reveals an extra heart sound, referred to as a mitral click. Fatigue, dizziness, and syncope are other symptoms of mitral valve prolapse.

A patient with a prosthetic heart valve is diagnosed with subacute infective endocarditis. The nurse knows that the majority of these infections are caused by:

Group A, beta-hemolytic Streptococcus Acute IE is often caused by Staphylococcus infection, and its onset is rapid, occurring within days to weeks. Subacute IE, usually caused by Streptococcus, occurs more slowly and its course is prolonged.

A patient is diagnosed with rheumatic endocarditis. What bacterium is the nurse aware causes this inflammatory response?

Group A, beta-hemolytic streptococcus Acute rheumatic fever, which occurs most often in school-age children, may develop after an episode of group A beta-hemolytic streptococcal pharyngitis (Chart 28-2). Patients with rheumatic fever may develop rheumatic heart disease as evidenced by a new heart murmur, cardiomegaly, pericarditis, and heart failure.

Which type of graft is used when a heart valve replacement is made of tissue from an animal heart valve?

Heterograft Heterograft, also called bioprosthesis, refers to replacement of tissue from animal tissue, usually pigs but also cows or horses. An autograft is a heart valve replacement made from the client's ow

The nurse suspects a diagnosis of mitral valve regurgitation when what type of murmur is heard on auscultation?

High-pitched blowing sound at the apex Mitral valve regurgitation is associated with a systolic murmur, which is a high-pitched, blowing sound at the apex.

In which type of cardiomyopathy does the heart muscle actually increase in size and mass weight, especially along the septum?

Hypertrophic Because of structural changes, hypertrophic cardiomyopathy had also been called idiopathic hypertrophic subaortic stenosis or asymmetric septal hypertrophy. Restrictive cardiomyopathy is characterized by diastolic dysfunction caused by rigid ventricular walls that impair ventricular stretch and diastolic filling. Arrhythmogenic right ventricular cardiomyopathy occurs when the myocardium of the right ventricle is progressively infiltrated and replaced by fibrous scar and adipose tissue.

A patient with endocarditis is being discharged home. In evaluating the effectiveness of patient teaching about how to prevent recurrence of the infection, the student nurse would expect the patient to state:

I will ask for antibiotics whenever I have dental work done." The patient should take antibiotics for dental procedures that involve manipulation of gingival tissue or the periapical area of the teeth or perforation of the oral mucosa. Exceptions include routine anesthetic injections through noninfected tissue, placement of orthodontic brackets, loss of deciduous teeth, bleeding from trauma to the lips or oral mucosa, dental x-rays, adjustment of orthodontic appliances, and placement of removable prosthodontic or orthodontic appliances.

A client who suffered blunt chest trauma in a motor vehicle accident complains of chest pain, which is exacerbated by deep inspiration. On auscultation, the nurse detects a pericardial friction rub — a classic sign of acute pericarditis. The physician confirms acute pericarditis and begins appropriate medical intervention. To relieve chest pain associated with pericarditis, which position should the nurse encourage the client to assume?

Leaning forward while sitting The nurse should encourage the client to lean forward, because this position causes the heart to pull away from the diaphragmatic pleurae of the lungs, helping relieve chest pain caused by pericarditis. The semi-Fowler's, supine, and prone positions don't cause this pulling-away action and therefore don't relieve chest pain associated with pericarditis.

A nursing student is caring for a client with end-stage cardiomyopathy. The client's spouse asks the nurse to clarify one of the last treatment options available that the physician mentioned earlier. After checking with the primary nurse, the nursing student would most likely discuss which of the following?

Left Ventricular assist device When heart failure progresses and medical treatment is no longer effective, surgical intervention, including heart transplantation, is considered. Because of the limited number of organ donors, many clients die waiting. In some cases, a left ventricular assist device is implanted to support the failing heart until a suitable donor becomes available. The other three choices have to do with failing valves and valve repairs.

A patient was diagnosed with mitral regurgitation. The nurse is aware that the patient should be observed for indicators of left- and right-sided heart failure. This understanding is based on the mechanics of cardiac hemodynamics. With mitral regurgitation, due to thickened valve leaflets, blood flows backward from the:

Left ventricle into the left atrium during systole. When the mitral valve leaflets thicken, fibrose, and contract, they cannot close completely. With each heartbeat, blood is forced backward into the left atrium during systole. Regurgitation of blood into the left atrium causes left atrial pressure to rise.

Incomplete closure of the mitral valve results in backflow of blood from the:

Left ventricle to left atrium When heart failure progresses and medical treatment is no longer effective, surgical intervention, including heart transplantation, is considered. Because of the limited number of organ donors, many clients die waiting. In some cases, a left ventricular assist device is implanted to support the failing heart until a suitable donor becomes available. The other three choices have to do with failing valves and valve repairs.

Which nursing intervention should a nurse perform to reduce cardiac workload in a client diagnosed with myocarditis?

Maintain the client on bed rest. The nurse should maintain the client on bed rest to reduce cardiac workload and promote healing. Bed rest also helps decrease myocardial damage and the complications of myocarditis. The nurse should administer supplemental oxygen to relieve tachycardia that may develop from hypoxemia. If the client has a fever, the nurse should administer a prescribed antipyretic along with independent nursing measures such as minimizing layers of bed linen, promoting air circulation and evaporation of perspiration, and offering oral fluids. The nurse should elevate the client's head to promote maximal breathing potential.

The school nurse is providing care to a child with a sore throat. With any sign of throat infection, the nurse stresses which of the following?

Obtaining a throat culture When a child has a sore throat and symptoms of a possible infection occur, it is essential that a culture is obtained. A culture can identify group A beta-hemolytic streptococcal infection, which needs to be eliminated with use of an antibiotic. Warm, salt gargles; increasing fluids; and administering antiseptic lozenges are helpful for symptom control. Obtaining a throat culture is a priority.

Which mitral valve condition generally produces no symptoms?

Prolapse Mitral valve prolapse is a deformity that usually produces no symptoms and has been diagnosed more frequently in recent years, probably as a result of improved diagnostic methods. Mitral valve stenosis usually causes progressive fatigue. Mitral valve regurgitation, in its acute stage, usually presents as severe heart failure. Mitral valve infection, when acute, produces symptoms typical of infective endocarditis.

The nurse is caring for a client with aortic regurgitation. The nurse knows to expect which of the following symptoms on physical examination?

Orthopnea and dyspnea Aortic regurgitation usually manifests as progressive left ventricular failure, resulting from blood flowing backward from the aorta to the left ventricle, and eventually into the lungs. Urine output would be decreased from lower cardiac output. Nausea and vomiting are symptoms of increased gastrointestinal pressure, which would result from right heart failure. Kidney failure could become a problem later if cardiac output became too low, but not initially. CVA and an infarcted bowel would not be caused by mitral regurgitation.

The nurse is reviewing the lab work of a client diagnosed with infective endocarditis. Which diagnostic study confirms the diagnosis?

Positive blood culture A positive blood culture identifies the microorganism circulating in the blood. Slight leukocytosis is common but can be associated with other disease processes. Serum cardiac antigens and immunosuppressant assay are not typical diagnostic studies.

The instructor is talking with a nursing student who is caring for a client with pericarditis. The instructor asks the student to name the main characteristic of pericarditis. What should be the student's answer?

Precordial pain Precordial pain is the main characteristic of pericarditis. Dyspnea, fever, and respiratory symptoms are not the main characteristics of pericarditis.

Which valve lies between the right ventricle and the pulmonary artery?

Pulmonic valve The pulmonic valve is a semilunar valve located between the right ventricle and the pulmonary artery. The tricuspid valve is an atrioventricular valve located between the right atrium and right ventricle. The mitral valve is an atrioventricular valve located between the left atrium and left ventricle. Chordae tendineae anchor the valve leaflets to the papillary muscle and ventricular wall.

Following the assessment of a patient with suspected pericarditis, the nursing student would determine which of the following findings to be most characteristic?

Reports of constant chest pain

Your client has been diagnosed with mitral valve prolapse syndrome. What is an important subject to include in the client's teaching?

Restriction of alcohol Because alcohol can suppress antidiuretic hormone, leading to loss of extracellular fluid, clients with mitral valve prolapse syndrome are advised to restrict or eliminate its use. A decreased activity level, nutrition, and stopping chewing tobacco are not important subjects to cover when teaching a client with mitral valve prolapse syndrome.

A nurse is obtaining a history from a new client in the cardiovascular clinic. When investigating for childhood diseases and disorders associated with structural heart disease, which finding should the nurse consider significant?

Rheumatic fever Childhood diseases and disorders associated with structural heart disease include rheumatic fever and severe streptococcal (not staphylococcal) infections. Croup — a severe upper airway inflammation and obstruction that typically strikes children ages 3 months to 3 years — may cause latent complications, such as ear infection and pneumonia. However, it doesn't affect heart structures. Likewise, medullary sponge kidney, characterized by dilation of the renal pyramids and formation of cavities, clefts, and cysts in the renal medulla, may eventually lead to hypertension but doesn't damage heart structures.

A client comes to the clinic reporting fever, chills, and sore throat and is diagnosed with streptococcal pharyngitis. A nurse knows that early diagnosis and effective treatment is essential to avoid which preventable disease?

Rheumatic fever Rheumatic fever is a preventable disease. Diagnosing and effectively treating streptococcal pharyngitis can prevent rheumatic fever and thereby rheumatic heart disease.

Which of the following is the most significant risk factor for mitral stenosis?

Rheumatic fever The most significant risk factor for mitral stenosis is rheumatic fever, which gradually causes the mitral valve leaflets to thicken and can result in leaflet fusion. Risk factors for aortic regurgitation are infective endocarditis, Marfan's syndrome, and a dissecting aortic aneurysm.

It is important for a nurse to be aware of the normal hemodynamics of blood flow to recognize and understand pathology when it occurs. The nurse should know that incomplete closure of the tricuspid valve results in a backward flow of blood from the:

Right ventricle to the right atrium. The tricuspid valve is located between the right atrium and the right ventricle. Therefore, incomplete closure results in the backward flow of blood from the right ventricle to the right atrium.

After a detailed diagnostic workup, a patient has been diagnosed with atrial septal defect (ASD). The nurse should recognize that this patient may exhibit many of the signs and symptoms that are typically associated with:

Right-sided heart failure Because of left-to-right shunting of blood in ASDs, patients often experience elevated right heart pressure and pulmonary congestion. This does not mimic the signs and symptoms of acute coronary syndrome or of infectious processes such as endocarditis.

The nurse is providing discharge teaching for a client with rheumatic endocarditis but no valvular dysfunction. On which nursing diagnosis should the nurse focus her teaching?

Risk for infection Clients with endocarditis have a Risk for infection. The nurse should stress to the client that he'll need to continue antibiotics for a minimum of 5 years and that he'll need to take prophylactic antibiotics before invasive procedures for life. There is no indication that the client has Chronic pain or Impaired memory. Because the client doesn't have valvular damage, Impaired gas exchange doesn't apply.

A nurse is told in report that a patient has aortic stenosis. Which anatomical position should the nurse auscultate to assess the murmur?

Second intercostal space, right sternal notch The second intercostal space, right sternal notch, is the area on the chest where the aorta can best be heard opening and closing. Erb's point allows the nurse to hear the opening and closing of the tricuspid valve. The second intercostal, left sternal notch is where to hear the pulmonic valve. The fourth intercostal space, left sternal border is to assess the tricuspid.

A nurse is caring for a client with acute mitral regurgitation related to an acute myocardial infarction. The nurse knows to monitor the client carefully for symptoms of which initial complication or result?

Severe heart failure Acute mitral regurgitation usually manifests as severe congestive heart failure, resulting from blood flowing backward from the left ventricle to the left atria and eventually into the lungs. Kidney failure could become a problem later if cardiac output is too low, but not initially. CVA and an infarcted bowel would not be caused by mitral regurgitation.

A client with a myocardial infarction develops acute mitral valve regurgitation. The nurse knows to assess for which manifestation that would indicate that the client is developing pulmonary congestion?

Shortness of breath Chronic mitral regurgitation is often asymptomatic, but acute mitral regurgitation (e.g., resulting from a myocardial infarction) usually manifests as severe congestive heart failure. Dyspnea, fatigue, and weakness are the most common symptoms. Palpitations, shortness of breath upon exertion, and cough from pulmonary congestion also occur. A loud, blowing murmur often is heard throughout ventricular systole at the apex of the heart. Hypertension may develop when reduced cardiac output triggers the renin-angiotensin-aldosterone cycle. Tachycardia is a compensatory mechanism when stroke volume decreases.

Which symptom occurs in the client diagnosed with mitral regurgitation when pulmonary congestion occurs?

Shortness of breath If pulmonary congestion occurs, the client with mitral regurgitation develops shortness of breath. A loud, blowing murmur often is heard throughout ventricular systole at the apex of the heart. Hypertension may develop when reduced cardiac output triggers the renin-angiotensin-aldosterone cycle. Tachycardia is a compensatory mechanism when stroke volume decreases.

A nurse caring for a patient with mitral stenosis understands that the initial cause of disruption to the normal flow of blood through the heart is due to:

The increased resistance of a narrowed orifice between the left atrium and the left ventricle. Left atrial pressure increases because of the slowed blood flow into the LV through the narrowed orifice. The left atrium dilates and hypertrophies because of the increased blood volume. Pulmonary venous pressure rises, and the circulation becomes congested. As a result, the RV and right atrium become enlarged. Eventually, the ventricle fails

The nurse determines that a patient has a characteristic symptom of pericarditis. What symptom does the nurse recognize as significant for this diagnosis

constant chest pain The most characteristic symptom of pericarditis is chest pain, although pain also may be located beneath the clavicle, in the neck, or in the left trapezius (scapula) region. Pain or discomfort usually remains fairly constant, but it may worsen with deep inspiration and when lying down or turning.

A client with a history of cardiomyopathy experiences dyspnea on exertion, fatigue, leg swelling, and chest pain. This client has which type of cardiomyopathy?

dilated cardiomyopathy Dilated cardiomyopathy, the most common type, is accompanied by dyspnea on exertion and when lying down. The client experiences fatigue and leg swelling and may also have palpitations and chest pain. Peripartum cardiomyopathy may develop in women shortly before or after giving birth. Hypertrophic cardiomyopathy is associated with syncope, fatigue, SOB, and chest pain. Restrictive cardiomyopathy has symptoms of exertional dyspnea, dependent edema in the legs, ascites (fluid in the abdomen), and hepatomegaly (enlarged liver).

A nurse reviewing a client's echocardiogram report reads the following statements: "The heart muscle is asymmetrically thickened and the overall size and mass are increased, especially along the septum. The ventricular walls are thickened, reducing the size of the ventricular cavities. Several areas of the myocardium show evidence of scaring." The nurse knows these manifestations are indicative of which type of cardiomyopathy?

hypertrophic In hypertrophic cardiomyopathy (HCM), the heart muscle asymmetrically increases in size and mass, especially along the septum. It often affects nonadjacent areas of the ventricle. The increased thickness of the heart muscle reduces the size of the ventricular cavities and causes the ventricles to take a longer time to relax after systole. The coronary arteriole walls are also thickened, which decreases the internal diameter of the arterioles. The narrow arterioles restrict the blood supply to the myocardium, causing numerous small areas of ischemia and necrosis. The necrotic areas of the myocardium ultimately fibrose and scar, further impeding ventricular contraction. Because of the structural changes, HCM had also been called idiopathic hypertrophic subaortic stenosis (IHSS) or asymmetric septal hypertrophy (ASH). Restrictive (or constrictive) cardiomyopathy (RCM) is characterized by diastolic dysfunction caused by rigid ventricular walls that impair ventricular stretch and diastolic filling. Arrhythmogenic right ventricular cardiomyopathy (ARVC) occurs when the myocardium of the right ventricle is progressively infiltrated and replaced by fibrous scar and adipose tissue.

Statistics show an increase in the prevalence of infective endocarditis among older adults. Which factor places older adults at risk for developing infective endocarditis?

increased use of prosthetic valve replacements The prevalence of infective endocarditis among older adults has increased in part due to the increased number of prosthetic valve replacements, including replacements for older adults, and an increase in hospital-acquired bacteremia. While history of a repaired congenital heart defect does place a client at greater risk for developing infective endocarditis in the future, it has not been shown as a contributing factor in the prevalence of infective endocarditis among older adults. IV drug use and IV drug abuse places individuals at greater risk for infective endocarditis. However, this risk has not been attributed to an increase in its prevalence among older adults. Tuberculosis is known to contribute to pericarditis among the general population and is not specific to the older adult client.

What is the most common cause of mitral stenosis?

rheumatic endocarditis Mitral stenosis is most often caused by rheumatic endocarditis, which progressively thickens the mitral valve leaflets and chordate tendineae. In adults, aortic stenosis is often a result of degenerative calcifications. Congestive heart failure and myocardial infarction are not the most common cause of mitral stenosis.

The nurse understands that which of the following medications will be administered for 6 to 12 weeks following prosthetic porcine valve surgery?

warfarin To reduce the risk of thrombosis in patients with porcine or bovine tissue valves, warfarin is required for 6 to 12 weeks, followed by aspirin therapy. Furosemide would not be given for 6 to 12 weeks following this type of surgery. Digoxin may be used for the treatment of arrhythmias, but not just for 6 to 12 weeks.