the client with alterations in cardiac output lecture 9/26/05 sherry burrell, rn, msn rutgers...
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The Client with Alterations in Cardiac Output
Lecture 9/26/05
Sherry Burrell, RN, MSNRutgers University
Nursing III
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Assessment Parameters• Cardiac Output
• Measures the effectiveness of the heart’s pumping abilities.
• CO is defined as the amount of blood that leaves the heart in one minute.
CO = Stroke Volume (SV) X Heart Rate (HR)
• Normal CO: Approximately 4-8 liters/minute
• Cardiac Index: CO per square meter of BSA • CO ÷ body surface area = CI
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C0= SV x HR• Stroke Volume (SV)
• The amount of blood that leaves the heart with each beat or ventricular contraction.• Not all blood ejected• Normal Adult 70 ml / beat
• Ejection Fraction (EF) • The percentage of end-diastole blood
actually ejected with each beat or ventricular contraction.
• Normal adult 55-70% (healthy heart)
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Stroke Volume• Three factors regulate stroke volume:
• Preload• The degree of stretch of the ventricle at
the end of diastole.
• Contractility• Force of ventricular contraction (systole);
inotropy.
• Afterload• The amount of resistance the ventricular
wall must overcome to eject blood during systole.
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Stroke Volume Cont.,• Preload
• The degree of ventricular stretch at end-diastole
• The Frank-Starling Law of the Heart Preload = Contractility (to a point)
• Factors Affecting Preload• Circulating volume • Body positioning • Atrial systole or “kick” • Medications
• Diuretics (i.e. Lasix)• ACE Inhibitors (i.e. Vasotec)• I.V. Fluids
Starling Curve
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Stroke Volume Cont., • Contractility
• Positive inotropic agents Force of contraction
• Negative inotropic agents• Force of contraction
• Factors that affect contractility• Autonomic nervous system (ANS)• Medications:
• Digoxin (Lanoxin) • Beta-adrenergic blockers (i.e. metoprolol ) • Calcium channel blockers (i.e. verapamil )
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Stroke Volume Cont., • Afterload
• Resistance to ventricular ejection during systole
• Factors that affect afterload• Outflow impedance
• Left side• High systemic blood pressures (SVR) • Aortic valve stenosis
• Right side• High pulmonary blood pressures (PVR) • Pulmonary valve stenosis
• Diameter of arterial vessels • Blood characteristics• Medications:
• ACE (angiotension converting enzyme) inhibitors
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CO = SV x HR• Heart Rate: beats per minute (bpm)
HR = CO (to a point)• HR >160 bpm = CO
• Leads to inadequate diastolic filling time = time for coronary artery filling and an increase workload of the heart.
• Factors that affect heart rate • ANS• Medications
• Atropine sulfate • Digoxin (Lanoxin)• Beta-adrenergic blockers / calcium channel blockers
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Assessment Considerations• General Cardiac Symptoms
• Fatigue• Chest pain or discomfort • Palpitations • Shortness of breath• Edema • Weight gain • Dizziness • Syncope, loss of consciousness
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Assessment: Special Populations
• Gerontologic Considerations• Heart function is adequate at rest; limited ability to
respond to stress and takes longer to return to baseline.
• Decrease sensation of chest pain; tend to be under quantified or even absent.
• Gender Considerations • Women:
• Smaller hearts and coronary arteries• Tend to present with “atypical symptom” of CAD
• Other Considerations• Diabetes mellitus and cardiovascular disease
• Increased threat; decreased symptoms !!
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Laboratory Analysis • Serum Enzymes • Blood Chemistry
• Lipid Studies• Electrolytes • Renal Function Studies
• Coagulation Studies • Hematologic Studies
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Serum Enzymes: Cardiac • Creatine Phosphokinase (Total CK / CPK)
• Non-Specific: enzyme elevated with damage to heart or skeletal muscles and brain tissue.
• Elevates in 4 to 8 hours• Peaks in 15 to 24 hours • Returns to normal in 3 to 4 days
• Creatine Phosphokinase Isoenzyme (CPK-MB)• Specific: isoenzyme of CPK; elevated with
cardiac muscle damage. • Elevates in 4 to 8 hours • Peaks in 15 to 24 hours• Returns to normal in 3 to 4 days
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Cardiac Enzymes • Myoglobin
• Non-specific: a heme protein found in muscle tissue; elevated with damage to skeletal or cardiac muscle.
• Elevates in 2 to 3 hours• Peaks 6-9 hours • Returns to normal 12 hours
• Lactic Acid Dehydrogenase (LDH)• Non-specific: enzyme elevated with damage to
many body tissues. (i.e. heart, liver, skeletal muscle, brain and RBC’s); Not frequently used today.
• Elevates in 1 to 3 days • Peaks in 2 to 5 days • Returns to normal 10 to 14 days
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Cardiac Enzymes Cont.,• Troponin I / T
• Specific: a contractile protein released with cardiac muscle damage; not normally present in serum.
• Elevates in 4 to 6 hours• Peaks in 10 to 24 hours• Returns to normal in 10 to 15 days
• Sensitivity superior to CK-MB within the first 6 hours of event.
• Has replaced LDH for client’s who delay seeking treatment.
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Other Serum Enzymes • C-Reactive Protein
• Protein marker of acute inflammatory reactions• Increased serum levels associated with increased risk of
acute cardiovascular events.
• Homocysteine• Amino acid; presence in serum suggests
increased risk of cardio-vascular events. • Natriuretic Peptides
• Hormone-like substances released into bloodstream with cardiac chamber distention.
• Atrial Natriuretic Peptide (ANP)• Brain or B-type Natriuretic Peptide (BNP)
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Blood Chemistry Analysis • Lipoprotein (Lipid) Profile
• Total Cholesterol• Normal < 200mg/dl
• Triglyceride• Normal < 150 mg/dl
• Low Density Lipoproteins (LDL)• Normal <130 mg/dl / “Optimal”
<100mg/dl• High Density Lipoproteins (HDL)
• Normal: > 40 mg/dl > 60 mg/dl cardio-protective
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Blood Chemistry Analysis Cont.,
• Serum Electrolytes• i.e. Na, K, Ca and Mg• Glucose / Hemoglobin A1C
• Coagulation Studies• PTT / aPTT• PT / INR
• Hematologic Studies • CBC
• Renal Function Studies • BUN• Creatinine
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Diagnostic Testing • Electrocardiography *
• 12-Lead EKG• Continuous bedside monitoring • Ambulatory monitoring
• Stress Tests• Thallium Scans
• Echocardiograms• Cardiac Catheterizations
* Previously Discussed
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Cardiac Stress Tests • Stressing the heart to monitor performance• Assists in Determining
• Coronary artery disease• Cause of chest pain• Functional capacity of heart• Identify dysrhythmias • Effectiveness of medications• Establish goals for a physical fitness routine
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Cardiac Stress Tests Cont., • Types of Stress Tests
• Exercise• Treadmill (most common)• Bike• Arm crank
• Pharmacological• Vasodilating agents to mimic the effects of
exercise • Persantin• Adenosine
• Mental / Emotional (new; under investigation) • Simulated public speaking • Mental arithmetic test
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Cardiac Stress Tests Cont.,• Thallium Scan
• Often combined with stress tests • Radiological exam to assess how well
the coronary arteries perfuse the myocardium.
• Images are taken 1 to 2 minutes prior to end of stress test and again 3 hours later.
• Nursing Considerations • NPO• IV Access
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Cardiac Stress Tests Cont.,• Nursing Considerations
• Explain procedure to client• Maintain NPO status 4 hour before test• Instruct client to avoid stimulants (i.e.
chocolate, caffeine and cigarettes) • Hold certain medications before testing
• Exercise: i.e. beta-adrenergic blockers • Pharmacologic: i.e. Theophylline (24-48 hours
prior)
• I.V. access must be obtained
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Echocardiogram • Ultrasound procedure of the heart
combined with an electrocardiogram (EKG).• Assesses
• Cardiac geometry (size & shape)• Motion of structures (chamber walls / valves)
• Simultaneous EKG assists in interpretation• Can be done in conjunction with stress
testing• Referred to as a stress echocardiography or
exercise echocardiography
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Echocardiogram Cont., • Types of Echocardiograms
• Transcutanoeous• Non-invasive / painless
• Transesphogeal (TEE)• Invasive / Clearer images • Nursing Considerations:
• Explain procedure• NPO 6 hours prior procedure• I.V. access• NPO 4 hours post-procedure• Monitor for complications
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Cardiac Catheterization • “Gold Standard” of cardiac diagnostics• Invasive procedure to assess
• Cardiac chamber pressures & oxygen saturations• Detect congenital or acquired structural defects• Ejection fraction
• Often Includes: • Coronary arteriography: to assess coronary
artery patency
• Using X-ray technique called fluoroscopy • Requiring the use of I.V. contrast / dye
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Cardiac Catheterization Cont.,
• Nursing Care• Prior to procedure
• Explain procedure • NPO prior to procedure (8 to 12 hours) • Check allergies (I.V. dye / shellfish / iodine)• Laboratory tests
• During procedure• I.V. access• Hemodynamic monitoring • Arterial and venous access via catheters
(sheaths) • Femoral (most common) or brachial
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Cardiac Catheterization Cont.,• Post-Procedure Nursing Care
• Maintain Client Bedrest for 6 to 8 hours• Extremity straight & HOB up < 30 degrees
• Maintain Adequate Hydration• IV Fluids (if ordered)• Encourage Fluids
• Frequent Monitoring For Complications • Vital signs• Puncture site• Distal pulses• Laboratory results
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The Client with Alterations in Cardiac Output
Lecture II9/30/05
Sherry Burrell, RN, MSNRutgers University
Nursing III
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Coronary Artery Disease (CAD)
• An insidious, progressive disease resulting in coronary artery narrowing or total occlusion.• Atherosclerosis
• Most common cause of CAD• The abnormal accumulation of plaques on
the vessel wall; involves inflammatory process.
• Causes narrowing then eventually blockages in the coronary arteries that reduces myocardial blood flow = CAD
• Asymptomatic until 75% occlusion of coronary artery lumen.
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Coronary Artery Disease Cont.,
• Basis of CAD Management • Framingham Study (1948- cont. today)
• Identified specific risk factors and life-style habits that increase one’s risk for developing atherosclerotic heart disease.
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CAD: Risk Factors • Modifiable
• Cigarette smoking• Hypertension
(HTN)• Hyperlipidema• Physical inactivity• Diabetes Mellitus• Obesity• Stress / Anxiety• Diet
• Non-Modifiable• Increasing Age
• Males >45 years old • Females >55 years old
• Gender• Affects both men and
women; #1 killer is U.S.
• Genetics• Strong genetic
component
• Ethnicity• Non-whites increased
incidences versus whites
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CAD: Interventions • Smoking Cessation• Diet• Exercise• Weight Management• Cholesterol
Management • Lipid Profile
• Normal: every five years
• Medications:• i.e Zocor, Crestor &
Niaspan
• HTN Management• BP Screenings • Medications:
• i.e. antihypertensives & diuretics.
• Diabetes Management • Blood glucose testing • Medications:
• i.e. oral hypoglycemics & insulin
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Angina Pectoris • As CAD progresses the atherosclerotic
plagues become significant, reducing blood flow to portions of the myocardium = Ischemia.• Myocardial ischemia clinically manifests
most often as angina or chest pain.• Angina pectoris is defined as myocardial
ischemia without cellular death.• Imbalance between myocardial oxygen
supply and demand
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O2
Myocardial Oxygen Supply and Demand Balance
Demand
Supply
O2
ArterialOxygenContent
Preload Afterload CoronaryArtery
Blood flowContractilityHeart Rate
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Precipitating Factors: Angina
• Any situation where oxygen demands are increased:• Physical exertion• Tachycardia• Dysrhythmias • Cold weather• Eating a heavy meal • Stress or emotional states
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Angina Pectoris • Signs and Symptoms
• Chest Discomfort or Pain• Can occur anywhere in chest; most commonly
behind sternum; poor localization • Pain may radiate to the back, arms (left most
common), shoulder, neck or jaw.• Described as pressure, tightness or burning
sensation • Often precipitated by physical exertion or stress • Maybe associated with a few of the following
symptoms: • SOB, weakness, anxiety, diaphoresis, N/V,
dizziness or numbness in upper extremities
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Types of Angina• Stable Angina
• Predictable, consistent pain with physical exertion & relieved with rest; “my usual chest pain”• Rest & NTG; can be managed medically for years
• Unstable Angina • Last longer than stable angina, new onset
or increased frequency / intensity of symptoms; pain at rest• Preinfarction or Crescendo Angina
• Lasting longer than 15 minutes /unrelieved by NTG x3 is a medical emergency!
• Call 911 / hospitalization for management
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Types of Angina Cont.,• Variant / Prinzmetal Angina
• Pain at rest; maybe cyclic, + ST segment elevation (reversible); usual cause is coronary artery vasospasm with or without atherosclerotic plaques• Nitrates & calcium channel blockers
• Silent Angina• No signs or symptoms; + ST segment
elevation • Nitrates, beta blockers, calcium channel
blockers & lifestyle changes
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Management: Unstable Angina
• Goals of Medical Management• Increase O2 supply & decrease O2 demand to the
myocardium. • Prevent MI and death• To actively intervene !!
• 12-Lead Electrocardiogram (EKG)• Significant CP without EKG changes; + changes
treated as an MI.• Laboratory Tests
• Electrolytes• Cardiac Enzyme Panel
• Rule-out MI: every 8 hours x 3 / 6 hours x4
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Management: Unstable Angina• Relief of Chest Pain: “MONA”
• Morphine (drug of choice)• Oxygen• Nitroglycerine
• Increase Coronary Artery Blood Flow • Antiplatelet medications
• ASA• Glycoprotein (GP) IIb/IIIa Inhibitors• Heparin
• Percutaneous Coronary Intervention (PCI)
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Management of Unstable AnginaDemand
O2
Beta Blockers
Ca ChannelBlockers
ACE I
Preload
NTGACE I
Morphine
Supply
Blood FlowNTG
Ca Channel Blockers
ASAAnticoagulants
Morphine
Open OccludedArteries
O2
PCI
Contractility
HR
Afterload
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Nursing Interventions: Unstable Angina
• Early Identification of Chest Pain• Assessment of Chest Pain
• Chest Pain: Intensity- Scales (0-10) & Characteristics- “OLD
CART”
• Mentation, overall tissue perfusion
• Vital signs, heart rhythm, pulse oximetery
• Diagnostics: 12- lead EKG and Laboratory tests
• Management of Chest Pain =“MONA”
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Nursing Interventions: Unstable Angina
• Calm Environment• Anxiety and fear of impending doom (death)
• Activity Restrictions • Avoid the valsalva maneuver
• Patient Education• Risk factors for CAD • Signs and symptoms of angina • Medications• When to call the doctor• Stress management techniques
See pp.403 box 16-8 Thalen
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Acute Coronary Syndromes (ACS)
• Umbrella term to describe a wide range of clinical presentations of CAD from unstable angina to acute myocardial infarction (MI). • Continuum, Not separate disorders!
UnstableAngina
AcuteMyocardial Infarction
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Myocardial Infarction (MI)• An MI is defined as irreversible necrosis
(death) of myocardial tissue, resulting from an abrupt decrease or total lack of coronary blood supply.• An abrupt and severe disruption of O2
supply and demand to the myocardium.• Causes:
• Coronary artery thrombosis (most common)• Coronary artery vasospasm• Cocaine• Trauma• Severe and abrupt hypotension
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Myocardial Infarction (MI) Cont.,
• Signs and Symptoms: • Chest Pain
• Severe and unrelenting substernal chest pain; often radiating to the back, left arm or jaw.
• Lasting for 30 minutes or more• Only relieved by opioids • Occurs without a know precipitating event;
usually occurring in the morning• Associated Symptoms
• SOB, weakness, anxiety, diaphoresis, N/V, dizziness or numbness in upper extremities.
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Myocardial Infarction Cont.,
• Pathophysiology • Irreversible cell death within 20-40
minutes of cessation of blood flow.• Wavefront of cellular death proceeds from
endocardium to epicardium.• EKG changes associated with an MI:
• Ischemia: T wave inversion• Injury: ST segment elevation• Infarction: Pathological Q waves
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Types of Myocardial Infarctions
• Classified according to muscle layer affected:• Q wave MI
• Transmural: full thickness muscle wall necrosis• Often associated with a more prolonged MI
• Non-Q wave MI• Partial-thickness muscle wall necrosis• Often associated with smaller, less complete
occlusions. • i.e. Subendocardial- necrosis of the inner 1/3 to
1/2 of the muscle wall.
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Types of Myocardial Infarctions • According to anatomical location
• Left Ventricle • Anterior Wall
• Left Anterior Descending (LAD)• Associated with left ventricular failure,
pulmonary edema & cardiogenic shock• Inferior Wall
• Right Coronary Artery (RCA)• Associated with dysrhythmias & conduction
disturbances • Posterior Wall
• RCA or Circumflex Artery
• Right Ventricle• Portion of the RCA; Rare
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Complications: Post-Acute MI• Dysrhythmias (Most Common)
• Sinus Bradycardia• Occurs in about 40% of clients after an
acute MI• Sinus Tachycardia
• Must be corrected !!• Atrial
• PAC’s or Atrial fibrillation common• Ventricular
• PVC’s and ventricular tachycardia (VT) • AV Heart Blocks
• Most common with inferior wall MI
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Complications: Post-Acute MI • Ventricular Aneurysm
• Non-contractile, thin ventricular wall = SV• Leads to acute heart failure, emboli and VT
• Ventricular Septal Defect• Rupture of septum; shunting of blood
• S/Sx: Severe CP, syncope, BP & holosystolic murmur
• Medical emergency; high mortality; surgery to correct
• Pericarditis• An inflammation of the pericardial sac
• S/Sx: Pain, friction rub (left sternal border)• Treatment: NSAIDS and ASA
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CAD / Angina / MI: Nursing Diagnoses
• Acute pain related to an imbalance between myocardial oxygen supply and demand.
• Anxiety related to fear of unknown or death.
• Ineffectual coping related to effects of acute illness and major lifestyle changes.
• Activity intolerance related to fatigue (secondary to an imbalance between oxygen supply and demand).
• Knowledge deficit related to CAD /angina / MI and its treatments.
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CAD / Angina / MI: Nursing Diagnoses
• Powerlessness related to the lack of control over current situation or disease progression.
• Ineffective (cardiopulmonary) tissue perfusion related to impaired arterial blood flow.
• Decreased cardiac output related to altered… • Preload• Afterload• Contractility• Heart rate / rhythm
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Acute MI: Management• Goals of Medical Management
• Chest pain control• To preserve the myocardium• Prevention or management of complications• Pharmacological / intervention-based therapies
• EKG• Positive changes and/or severe CP despite
medical therapies• Laboratory Tests
• Electrolytes• Cardiac Enzyme Panel
• Rule-in MI and then to monitor response to treatments
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Thrombolytic Therapy• Preserves the ischemic myocardium; limits
the size of infarction by restoring blood flow quickly; can be done in emergency room.• Thrombolytic Agents
• Work by causing lysis of clots; “clot busters”• i.e. Alteplase (t-PA) or Reteplase (r-PA)
• Eligibility Criteria• CP >30 minutes• < 12 hours from onset (many institutions < 6
hours) • Positive EKG changes• CP unrelieved with medical therapies (i.e. NTG)
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Thrombolytic Therapy Cont.,• Exclusion Criteria
• History of CVA or any bleeding disorder• Active internal bleeding or recent surgery
• Complications• Bleeding and reperfusion dysrhythmias
• Nursing Role• I.V. Access• Baseline labs• Monitoring
• Subsequent labs, vital signs & for complications• Bleeding Precautions
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Percutaneous Coronary Intervention
• Umbrella term for all various of interventional cardiac catheterization procedures. • Indications
• Angina refractory to medical therapies• Proximal coronary artery stenosis; single or
double vessels disease• Procedure & Nursing Care
• Much the same as cardiac catheterizations • Except: venous & arterial catheters; larger
lumen with interventional catheterizations (i.e. stents)
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Percutaneous Coronary Intervention• Procedural Variations
• Angioplasty• Percutaneous Transluminal Coronary Angioplasty
(PTCA)• Balloon tipped-catheter; expanded to dilate vessel• Laser- UV pulse laser to “vaporize” lesion
• Atherectomy• Removal of plaque from vessel
• Coronary Artery Stenting• Tiny metal mesh tubes
• Drug-eluting Stents: Coated with Rapamune• Brachytherapy
• For in-stent re-stenosis; gamma radiation therapy
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PCI Cont., • Nursing Care
• Prior to procedure• Explain procedure • NPO prior to procedure ( 8 to 12 hours) • Check allergies (I.V. dye / shellfish / iodine)• Laboratory tests
• During procedure• I.V. access• Hemodynamic monitoring • Arterial and venous access via catheters
(sheaths) • Femoral (most common) or brachial
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PCI Cont.,• Post-Procedure Nursing Care
• Maintain Client Bedrest for 6 to 8 hours• Extremity straight & HOB up < 30 degrees
• Maintain Adequate Hydration• IV Fluids (if ordered)• Encourage Fluids
• Frequent Monitoring For Complications • Vital signs• Puncture site• Distal pulses• Laboratory results
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PCI: Complications• Acute Coronary Artery Occlusion
• Thrombosis /emboli or persistent vasospasm• Impaired circulation to distal extremity
• Distal arterial emboli • “Blue toe syndrome”
• Disrupted plaques occludes small vessels; pulses and circulation checks are good but, severe pain.
• Hemorrhagic Event • i.e. Arterial tear: retroperitoneal bleeding
• Puncture Site Complications• i.e. Bleeding or hematoma formation
• Reperfusion DysrhythmiasSee pp. 735 table 28-7; Smeltzer & Bare
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Cardiac Surgery• Coronary Artery Bypass Graft (CABG)
• A surgical revascularization procedure; blockages are bypassed using internal mammary artery or great saphenous vein.
• Indications• Angina unrelieved by medical therapies• Left main disease• Triple vessel disease• Single or double vessel disease not
amendable to PCI or failed PCI
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Cardiac Surgery: CABG• Different Surgical Approaches
• On-Pump (Traditional CABG)• Cardiopulmonary bypass machine (extracorporeal
circulation); heart stopped during procedure
• Off-Pump• “Beating heart” procedure; uses “octopus device”
to stabilize the myocardium during procedure
• Minimally Invasive Direct CABG (MIDCABG)• Single vessel disease not amendable by PCI
procedures• Small thoracotomy incision; off-pump approach
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Cardiac Surgery: CABG• Complications
• Stroke (2% post-bypass reperfusion)• Hypertension• Hypotension• Bleeding• Dysrhythmias• Cardiac Tamponade
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CABG: Post-Operative Nursing Care
• Maintain airway patency • Continuous bedside monitoring• Mediastinal chest tube management
• Monitor drainage & avoid kinks in tubing • Assess pain levels frequently and provide relief
• Provide relief from anxiety and fear
• Assess the surgical incisions for s/sx of infection
• Assess the extremity from which vessel harvested • Look for signs impaired circulation & edema
• Monitor for complications
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Management of an Acute MI Demand
O2
Beta Blockers
Ca ChannelBlockers
ACE I
Preload
NTGACE I
Morphine
Supply
Blood FlowNTG
Ca Channel Blockers
ASAAnticoagulants
Morphine
Open OccludedArteries
O2
PCIThrombolytics
CABG
Contractility
HR
Afterload
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Cardiac Rehabilitation• Education and support for client and
family• Initiated once client is free of symptoms• Focuses:
• Education• Psychological Support• Physical Conditioning
• Goals: • Maximize QOL• Limit progression of CAD• Prevent further cardiac events
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Cardiac Rehabilitation • Phases of Cardiac Rehabilitation
• Phase I: Inpatient (post-event)• Education on medications, rest-activity balance,
follow-up appointments & when to call doctor or “911”.
• Low-level physical conditioning i.e. self-care & mobilization.
• Phase II: Outpatient Supervised• Physical conditioning & education on risk factor
modification
• Phase III: Outpatient Self-Directed• Maintain cardiovascular stability & long-term
physical conditioning
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The Client with Alterations in Cardiac Output
Lecture III10/10/05
Sherry Burrell, RN, MSNRutgers University
Nursing III
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Hemodynamics • Describe the intravascular pressures and the
flow occurring when the myocardium contracts and blood is pumped via the vascular system through-out the body.
• Basic Principles • Blood flow throughout the cardiovascular
system from area of higher pressures to areas of lower pressures.• Pressures created by cardiac cycle: systole &
diastole • Pressures: Cardiac chambers and vessels
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Hemodynamic Monitoring
• Two Major Categories • Non-Invasive
• i.e. Taking a blood pressure or a pulse
• Invasive• Intra-arterial blood pressure monitoring (A-lines)• Central venous pressures (CVP) catheters • Pulmonary artery (PA) catheters (Swan-Ganz)
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Invasive Hemodynamic Monitoring
• Three Components: • Transducer: Converts fluid waves into electrical
signals • Amplifier: Increases the size of the electrical signal • Monitor / Recorder: Displays the signal and saves
data
• Specialized Equipment: • Catheter access to client • Semi-rigid (high pressure) tubing
• Three-way stop cock • Intraflow or In-line flow device
• Inflatable pressurized sleeve / bag • I.V. Solution: 0.9 % NSS with heparin added
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Invasive Hemodynamic Monitoring Cont.,
• Calibration of Equipment • Leveling:
• Transducer at the level of right atrium
• Zeroing: • Atmospheric pressure
Let’s see how it’s done…
http://www.eonreality.com/demos/e-learning/ccn/unit3_4demo/e2_electdemo.html
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Intra-arterial BP Monitoring
• Indicated for direct, continuous blood pressure monitoring in the critically ill client. • Measures systolic, diastolic & mean arterial
pressures (MAP)• Allows for serial samplings of ABG’s• Considered “low-risk”• More accurate than cuff pressures in low CO
and shock (not affected by vasoconstriction) • NEVER USED TO GIVE MEDICATIONS !!
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Intra-arterial BP Monitoring Cont.,
• Insertion Sites:• Radial (most common)• Brachial • Femoral
• Insertion Techniques:• Percutaneous • Cut-down (if necessary)
• Insertion Assessment:• Distal Blood Flow
• Doppler Ultrasound• Allen’s Test
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Intra-arterial BP Monitoring Cont., • Nursing Considerations
• Monitor for complications• Compromised blood flow to distal extremity
• i.e. thrombosis or arterial spasm
• Insertion Site• i.e. Infection, bleeding, hematoma or skin
breakdown
• Maintenance of System• Sterile dressing changes• Tubing, caps and flush bag changes
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Central Venous Pressure (CVP) Catheters
• Measures the pressures in the right atrium.• Used to assess right ventricular function
and venous blood return to heart.
• CVP / Right Atrial Pressures: Reflection of right ventricular filling pressures (preload).
• Normal Limit: 2- 6 mm Hg• Increased CVP = Fluid Overload• Decreased CVP = Hypovolemia
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CVP Catheters Cont., • Insertion Sites
• Internal Jugular• Subclavian Vein
Tip advanced to the Superior Vena Cava
• Prior to Use:• Chest X-Ray
• Confirm placement• Rule-out pneumo- or hemo- thorax
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CVP Catheters Cont., • Complications
• Dislodgement • Infection• Air Embolism• Cardiac dysrhythmias
• Nursing Care• Sterile dressing changes• Tubing, caps and fluid bag changes • Flushing of lumens; never tie off !!
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Pulmonary Artery (PA) Catheters
• Used to assess left ventricular function.• “Multi-Tasking” Catheters
• Right Atrial Pressures (same as CVP)• Pulmonary Artery:
• Pulmonary artery systolic pressures (PAS)• Pulmonary artery diastole pressures (PAD)• Pulmonary artery mean pressure (MAP)
• Left Atrial Pressures: • Pulmonary artery occluded pressures
(PAOP)• Normal limit = 5-13 mmHg• Reflection of left ventricular filling pressures
(preload)
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PA Catheters Cont., • “Multi-Tasking” Catheters Cont.,
• Intermittent Cardiac Output
• Specialized PA Catheters• Additional Features
• Continuous I.V. infusions • Continuous CO monitoring • Continuous venous mixed oxygen saturation
monitoring• Represents venous blood saturations from many body
tissues• Monitors balance between O2 supply and demand
• Temporary transvenous pacing wires
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PA Catheters Cont., • Insertion Sites:
• Internal Jugular• Subclavian Vein
Threaded into the right atrium, to right ventricle finally resting in the pulmonary artery.
• Prior To Use:• Chest x-ray
• Ensure proper placement• R/O pneumo- or hemo- thorax
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PA Catheters Cont., • Complications
• Dislodgement • Infection• Air embolism• Cardiac Dysrhythmias • Thromboembolism• Pulmonary Artery rupture
• Nursing Care• Sterile dressing changes• Tubing, caps and fluid bag changes • Flushing of lumens; Never tie off !!
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Heart Failure • The inability of the heart to pump
adequate amounts of blood to meet body’s needs for oxygen & nutrients.• Common causes:
• CAD• HTN• Cardiac Infections • Cardiomyopathy• Valvular Disorders• Myocardial Infarction• Dysrhythmias
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Classification of Heart Failure
• Onset:• Acute heart failure • Chronic heart failure
• Affected portion of the cardiac cycle:• Diastolic heart failure• Systolic heart failure
• Affected side of the heart: • Left heart failure • Right heart failure
• Stages of heart failure severity:• New York Heart Association • American Heart Association/American College of
Cardiology
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Acute or Chronic Heart Failure• Describes the speed of onset of heart
failure• Acute Heart Failure
• Sudden onset• No compensatory mechanisms• May experience acute pulmonary
edema,CO or cardiogenic shock
• Chronic Heart Failure• Gradual (insidious) Onset • Presence of compensatory mechanisms
• Structural heart chamber changes (dilation or hypertrophy)
• Fluid overload & sodium and water retention• Ongoing process; may deteriorate into acute HF
• i.e. Onset of dysrhythmias or cessation of medications
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Heat Failure: Compensatory Mechanisms
• Sympathetic Nervous System:• Decreased tissue perfusion results in activation of the
sympathetic nervous system, resulting in: • ↑ Heart rate• ↑ Contractility• Vasoconstriction of arteries, arterioles & veins
(↑afterload & ↑preload) • RAAS: Renin-Angiotension-Aldosterone
System• Decreased renal perfusion stimulates the increased
release of renin→ angiotensin II production, resulting in:• Vasoconstriction (↑ afterload)• Release of aldosterone: Na+ & water retention
(↑preload)
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Heat Failure: Compensatory Mechanisms
• Ventricular Remodeling:• Final compensatory mechanism • The ventricles change in size & shape in order
to overcome the ↑ resistance (afterload) of heart failure. • Hypertrophy
• The ventricles thicken and become stiff resulting in impairing filling during diastole.
• Dilation• The heart muscle becomes over-stretched resulting
in a decreased force of contraction during systole.
• Overtime these mechanisms may actually worsen heart failure !!
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Myocardial Disease / InjuryImpaired Ventricular Performance
Cardiac Output
↑ SNS↑ HR
↑ Contractility Vasoconstrictio
n
↑ RAASVasoconstriction
Na/H2O Retention
CardiacWorkload
Ventricular
RemoldingDilation &
Hypertrophy
Vicious Cycleof
Heart Failure
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Systolic or Diastolic Heart Failure
• Described HF based on cardiac cycle• Diastolic Heart Failure
• Disorder of ventricular filling• Structural changes: usually ventricular
hypertrophy• Normal Ejection Fraction
• Systolic Heart Failure (more common)• Disorder of ventricular contraction• Structural changes: usually ventricular dilation Ejection Fraction (< 40%)
• Combined diastolic & systolic impairments are common.
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Systolic & Diastolic Heart Failure: Remodeling
(Jessup & Brozena, 2003)
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Left & Right Sided Heart Failure
• Describes Heart failure based on the side of the heart that is affected.• Left-Sided Failure
• Left ventricular failure• Pulmonary congestion
• Sign/Symptoms: i.e. fatigue, SOB, dyspnea, PND, orthopena, crackles, dry cough, & tachycardia
• Right-Sided Failure• Right ventricular failure• Systemic congestion
• Signs/Symptoms: i.e. weakness, peripheral edema, weight gain, JVD, hepatomegaly, anorexia & N/V.
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NYHA: Functional Classification of HF
I No symptoms and no limitation in ordinary physical activity.
II Mild symptoms and slight limitation during ordinary activity. Comfortable
at rest.IIIMarked limitation in activity due to
symptoms, even during less-than-ordinary activity. Comfortable only at rest.
IV Severe limitations. Experiences symptoms even while at rest.
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AHA/ACC: Classification System of HF
(Jessup & Brozena, 2003)
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Heart Failure: Nursing Diagnoses
• Impaired gas exchange related to ventilation perfusion imbalance.
• Decreased cardiac output related to altered… • Preload• Contractility• Afterload• Heart rate /rhythm
• Activity intolerance related to fatigue (secondary to by an imbalance between oxygen supply and demand).
• Ineffective (cardiopulmonary) tissue perfusion related to impaired arterial blood flow.
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Heart Failure: Nursing Diagnoses
• Excess fluid volume related to excess fluid or sodium intake and retention of fluid secondary to heart failure and its treatments.
• Anxiety related to breathlessness and / or restlessness secondary to inadequate oxygenation.
• Powerlessness related to inability to perform usual role responsibilities.
• Knowledge deficit related to heart failure and its treatments.
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Nursing Management: Heat Failure
• Nursing Considerations • Respiratory
• Supplemental oxygen • Good lung assessment
• Monitoring • Hemodynamic Monitoring • Daily Weights• I & O’s • Laboratory Results
• i.e. electrolytes, BNP & digoxin levels
• Maintain • Small frequent meals; low in salt • Skin integrity
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Nursing Management: Heat Failure
• Nursing considerations Cont.,• Promote rest and avoid fatigue • Assess for peripheral edema
• Client Education• Medications • Lifestyle changes
• i.e. low-sodium diet & activity-rest balance • Daily weights • S/Sx of worsening heart failure to report • Importance of follow-up care
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Heart Failure Management• Goals of management
• Relief of health failure symptoms• Enhance cardiac performance
• Pharmacologic Management • Reduce Cardiac Workload
• Diuretics: Preload; watch for hypokalemia• Nitrates: Preload • ACE I / ARB’s: Preload & Afterload• Beta blockers / ACE I: Enhance reverse
remolding
• Increase Positive Inotropic Effects• i.e. Digoxin (Lanoxin)
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Heart Failure Management • Mechanical Assist Devices
• Intra Aortic Balloon Pump (IABP)• Most widely used temporary assist
device• Augments diastolic coronary
artery blood flow, enhances renal perfusion & reduces afterload
• Used to reduce cardiac workload when medical therapies are refractory
• i.e. Acute MI, after cardiac surgery or heart Failure
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Heart Failure Management• Ventricular Assist Devices
• Provide flow assistance to the failing ventricle• Three types available
• Left ventricular assist devices (LVAD); Most Common
• Bilateral ventricular assist devices (BiVAD)• Right ventricular assist devices (RVAD)
• Categories of use• Support to pending recovery• Bridge to transplantation• Destination therapy
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Heart Failure Management• Surgical Interventions
• Correct Underlying Problem• Revascularization; CABG• Valvular repair or replacement
• Artificial, human or animal valves• Cardiac support devices
• ACORN CorCap
• Heart transplantation• UNOS Stats (2003 U.S.)
• 3,519 wait listed• 2,055 transplanted Not enough to go around !!
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Complications of Heart Failure
• Electrolyte Imbalances• i.e. Hypokalemia
• Medication Toxicity • i.e. Digoxin
• Dysrhythmias • Cardiac Tamponade • Cardiogenic Shock • Pulmonary Edema
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Pediatric Considerations• Most causes of heart failure are
congenital heart defects.• Three categories of signs & symptoms
• Impaired Myocardial Function• Tachycardia, gallop rhythm (S3 & S4) &
diaphoresis
• Pulmonary Congestion• Tachypnea*, dyspnea, costal retractions &
developmental delays
• Systemic Congestion• Hepatomegaly*, JVD, weight gain & peripheral
edema * See Box 34-1, pp. 1478 Wong