9.1 Cardiovascular Part 2 Flashcards
Valves of The Heart
- Mitral and Tricuspid
Located between atria and the ventricles - Aortic and Pulmonary
Located between ventricles and major blood vessels leaving the heart - Maintain unidirectional flow of blood through the heart
Valvular Dysfunction
Results from
- Congenital defects
- Trauma
- Ischemic damage
- Degenerative changes
- Inflammation
- Radiation
- When injured valve leaflets are healing, collagen deposits and scarring occurs which causes these leaflets to shorten and stiffen
- Valvular disorders most commonly affect aortic and mitral valves.
Regurgitation
- Also called incompetent, regurgitant and insufficient
- Failure of valve to close which allows backflow of blood
Aortic Regurgitation - Allows backflow to left ventricle during diastole
Mitral Regurgitation - Affects backflow to left atrium during systole
Stenosis
- Narrowing of valve orifice and failure of leaflets to open all the way, which results in blood failing to move forward as it should
Mitral Stenosis
- Fibrous replacement of valvular tissue, stiffness, and fusion of valve leaflets
- Valve becomes funnel shaped because of thickening
- Usually caused by rheumatic heart disease, rheumatic fever, or congenital defects
- Exertional dyspnea is the most common symptom
- Can also cause palpations (atrial dysrhythmias), pulmonary congestion, post-nocturnal dyspnea (SOB during sleep), orthopnea (difficulty breathing when lying flat).
- Rheumatic means caused by inflammation due to immune system
Mitral Regurgitation
- Structural changes to valve leaflets, annules or chordae
- Incomplete closure of leaflets causes backflow to left atrium during systole
- Caused by Trauma, MI, Infective Endocarditis, and MVP (Mitral Valve Prolapse)
- Signs and symptoms include enlarged left ventricle, hyperdynamic left ventricular impulse (shaking of pericardium), and pansystolic murmur (murmur heard from 1st to 2nd sound).
Mitral Valve Prolapse
- Non-inflammatory disarray of valvular structure where leaflets and chordae are abnormally stretchy
- Leaflets become enlarged and floppy and either prolapse or balloon back into left atrium during systole.
- Caused by familial, infections, or connective tissue diseases.
- It affects mostly tall thin women, can be asymptomatic but if symptoms do occur it can cause irregular heart beats, palpitations, and SOB.
Aortic Stenosis
- Because there is increased resistance to ejection of blood from the left ventricle, it increases the work demand of the left ventricle which decreases blood into circulation
- Causes include rheumatic fever and congenital valve disorders
- S/S include syncope (fainting), angina, CHF, dyspnea, peripheral cyanosis
Aortic Regurgitation
- Blood flows back into the left ventricle during diastole which results in increased left ventricular stroke volume
- Caused by rheumatic fever, Infective Endocarditis (IE), and Trauma
- Symptoms don’t occur until heart failure occurs which can cause exertional dyspnea, orthopnea, post-nocturnal dyspnea, chest pain, and syncope
Nursing Management of Valvular Heart Disorders
- Monitor vital signs, heart failure, dysrhythmias
- Assess for pain, dizziness, syncope
- Monitor daily weights
- Maintain rest and comfort for patient
EDUCATION
- Sleep with HOB elevated to facilitate breathing
- Balancing activity with rest periods
- Monitor weight gain
- Medication adherence
Commissurotomy
- Remove calcium deposits and other scar tissue from the leaflets
- Mitral valve stenosis is an open procedure or percutaneous balloon procedure
Balloon Valvuloplasty
- Minimally invasive procedure where a balloon catheter is inserted through the femoral artery into the heart to widen the valve and improve blood flow
Annuloplasty
- Tightens and reinforces the ring around a valve to support it
Leaflet repair
- Minimally invasive robotic procedure that removes abnormal leaflet segments and edges of the leaflet are sewn back together
Chordoplasty
- Remodels the chordae tendineae which is responsible for maintaining the position and tension of valve leaflets
Valve Replacement
- Consideration must be made about the patients age, valve durability, medication options, and risks
- High rate of long term success
Mechanical Replacement
- Made of strong durable material that can last the remainder of a patients life
- It is essential to prevent clot formation because they can cause malfunction of the valve or cause embolus
Tissue Replacement (Bioprosthetic Valve)
- Created from animal valves that last 10-20 years
- It is very likely it will need to be replaced later in life so younger people do not find it appealing
- Do not require long term use of anticoagulation
Autografts
- Ross-Yacoub Pulmonary Autograft
- Aortic valve is replaced with a persons own pulmonary valve, and their pulmonary valve is replaced by a allograft from a corpse.
Homografts
- Human donor valves are used
- Usually used for patients with infective endocarditis
- Can be expected to last 10-20 years
- Most uncommon type
Nursing Management of Valvular Surgery
- Hemodynamic stability (stable blood flow) and recovery from anesthesia
- Assess cardiovascular, neurologic and respiratory systems
- Heart sounds are assessed every 4 hours as well as heart failure monitoring and emboli
- Patient education focuses on anticoagulation therapy, prevention of infective endocarditis, routine cardiology follow ups, and repeat ECG to assess valve functions
Cardiomyopathy
- Disease of the heart muscles
- “Acquired” comes secondary to another disease
- “Inherited” comes from genetics
- Cause is usually not known
- Progressive disorder that impairs cardiac output and leads to HF, sudden death, or dysrhythmias.
Hypertrophic Heart Failure
- Caused by excessive ventricular growth (hypertrophy)
- Involvement of the ventricular septum is often disproportionate
- Common disease of young adults
- Unknown/genetic cause
- Causes dyspnea
- Elevation in left ventricular diastolic pressure causes impaired ventricular filling, and increased wall stiffness due to ventricular hypertrophy
- Most common cause of sudden cardiac death in younger athletes
MEDICATIONS - DO NOT USE DIURETICS DUE TO RISK OF DEHYDRATION
- Beta blockers, calcium channel blockers, anticoagulants
Dilated Cardiomyopathy
- Progressive cardiac hypertrophy and dilation with impaired systolic function (pumping ability of ventricles)
- Decreased myocardial contractility
- Caused by genetics, ischemic heart disease, infection, toxins, alcohol, chemotherapy, metal
- S/S include heart failure, dyspnea, orthopnea, decreased exercise capacity
- Systemic and mural thrombi can be seen in later stages
- Death usually occurs from HF and dysrhytmias
- This is the most common cause of needing a heart transplant
MEDICATIONS - ACE inhibitors and Angiotensin 2 blockers if ACE does not work
- Beta blockers
- Diuretics
- Digoxin
- Anticoagulants
Restrictive Cardiomyopathy
- Ventricular filling is affected because of rigidity of ventricular walls
- Caused by infiltrative diseases like amyloidosis, fibrosis, sarcoidosis, metastatic tumors
- Causes dyspnea, Paroxysmal Nocturnal Dyspnea (PND) - SOB after waking up, orthopnea, peripheral edema, fatigue, weakness
- Cardiomegaly and dysrhythmias are often seen (death caused by RHF and dysrhythmias)
- Treatment depends on the cause but medications same as DCM
Cardiomyopathy Assessment
- Predisposing factors, family history
- Chest pain
- Diet including sodium and vitamins
- VS, pulse pressure, weight gain/loss, PMI (point of maximal impulse), murmurs, s3 or s4 sounds, pulmonary auscultation for crackles, JVD, edema
Nursing Diagnosis for Cardiomyopathy
- Decreased CO
- Risk for ineffective cardiac, cerebral, peripheral, renal tissue perfusion
- Impaired gas exchange
- Activity intolerance
- Anxiety
- Powerlessness
- Noncompliance with medications and diet therapies
Cardiomyopathy Issues
- Heart failure
- Ventricular dysrhythmias
- Atrial dysrhythmias
- Cardiac conduction defects
- Pulmonary/cerebral embolism
- Valvular Dysfunction
Goals for Cardiomyopathy patients
- Maintenance of CO
- Increased activity tolerance
- Adherence to care program
- Increased sense of power in decision making
Nursing Interventions for Cardiomyopathy
- Improve CO by promoting rest with legs down, supplemental O2, low sodium, O2 therapy, and avoiding dehydration
- Increase activity tolerance and gas exchange by balancing rest with activity and ensuring patient recognizes the need for rest
- Decrease sense of powerlessness by assisting patient in identifying things they have lost (ability to play sports) and identifying things they still have control over
Dobutamine (Dubotrex)
- Beta 1 adrenergic agonist with positive inotropic effects
- Short term use for patients with decreased contractility due to HF
- Cardiac Decompensation (Heart can no longer provide proper circulation)
- Given as IV
- Used for decompensated HF because it increases contractility which leads to larger stroke volume and increased cardiac output.
ADVERSE EFFECTS - Hypertension, tachycardia, ventricular dysrhythmias
- Increased HR in A-Fib patients
- Sulfite hypersensitivity
RARE ADVERSE EFFECTS - Hypokalemia and phlebitis
Digoxin
- Narrow therapeutic index so dose must be monitored closely
- Manages HF symptoms and treats A-Fib (flutter)
- Positive inotrope, negative dromotropic (slows conduction), slows HR (negative chronotropic).
- Ultimately increases CO and controls heart rhythm
DO NOT USE IN PATIENTS WITH HEART BLOCK OR VENTRICULAR FIBRILATION - Toxicity (most common with hypokalemia) causes GI disturbances (n/v, diarrhea, abd pain)
- Cardiotoxicity includes brady/tachy dysrhythmias and heart block
- CNS toxicity includes drowsiness, fatigue, lethargy
- Blurred vision, haloes, color disturbances and sarcoma
ANTIDOTE - DIGIBIND (IV AFTER RECONSTITUTION) - Check apical pulse for a full minute before administering (hold dose if less than 60 bpm)
- ASSESS DRUG BLOOD LEVELS BEFORE ADMINISTERING
EDUCATION - Do not stop medication abruptly, take pulse before each dose, monitor weight gain
- Report swelling in ankles/feet, SOB, or toxicity