Cardiac Disorders and Hemodynamic Monitoring Flashcards
Cardiac Enzymes
- CKMD
- CKMB
- Troponin
CKMD
Indicates muscle damage (could be any muscle damage, not just the heart)
- Creatine kinase
CKMB
Muscle band; is the most sensitive but takes longer to rise ( > 5%)
- Creatine kinase
Troponin
Cardiac enzyme that is seen in the blood sooner than CKMB
- Rises 4-6 hours
- Enzymes appear, then peak and then suddenly go down. If not then patient is extended their MI and experiencing more cardiac damage
- Troponin is released by the necrotic heart tissue
- Indicates myocardial damage, lasts in blood 10-14 days
Lipid Profile
Cholesterol, triglycerides, and lipoproteins are measured to evaluate a patient’s risk of developing CAD
Lipoproteins
Is important in the diagnosis of MI. Is a little slower at showing up in the blood, one of the last to arrive.
- Tests are done series over 3 days. Person sits around the house 2 days after chest pain, the CKMB will start to diminish after 3 days but the LDH will stay. Will be checked more than once if there is any abnormality.
- Check to see if it’s peaked & now coming down. Don’t want continuous elevation.
- Can also be indicator of an older MI that occurred.
Cholesterol
<200 normal (140-200)
** HDL – “good”, transports cholesterol away from the tissue and cells.
** LDL – “bad”, transports cholesterol and triglycerides into the cell.
How is a chest x-ray used for cardiac diagnostics?
Shows cardiomyopathy. Also done to check for heart size and congestion.
SED Rate
Inflammation 0-15 men, 0-20 women
C-reactive protein
Indicator of possible MI, indicates infection
Cardiac Diagnostics: BNP
Measures fluid volume
Cardiac Diagnostics: Cardiac Stress Test
Shows heart’s ability to endure stress. Types of stress testing include:
- Exercise stress testing
- Pharmacological stress testing
Cardiac Diagnostics: Radionuclide Imaging
Shows myocardial ischemia and infarction and evaluate lest ventricular function through the use of radioisotopes
What does an EKG look like during an acute MI
- T wave inversion
- ST elevation
- Formation of Q wave
What does an EKG look like when there is ischemia?
Depression or T wave inversion
What does an EKG look like when there is myocardial injury?
ST segment elevation
Cardiac Diagnostics: Cardiac Catheterization
Invasion procedure used to measure cardiac chamber pressures and assess patency of coronary arteries
Cardiac Diagnostics: Electrophysiologic Testing (EPS)
Invasive procedure used to locate the source of serious dysrhythmias
Cardiac Diagnostics: Hemodynamic Monitoring
Invasive measurement of the movement of blood and the pressures being exerted in the veins, arteries, and chambers of the heart
What is CAD
Coronary Artery Disease
- Accumulation of plaque causing impaired blood flow to the heart muscle
- In coronary atherosclerosis, blockages and narrowing of the coronary vessels reduce blood flow to the myocardium
Clinical Manifestations of CAD
- May be asymptomatic or lead to angina
- MI
- Dysrhythmias
- Heart failure
- Sudden death
Risk Factors for CAD
- HTN
- DM
- Hyperlipidemia
- Increased homocysteine level
- Metabolic syndrome
- Lifestyle factors: obesity, smoking, inactivity, diet, drug abuse
- Men or postmenopausal women
- Age
What is Angina Pectoris?
Chest discomfort that occurs when there is a decreased blood oxygen supply to an area of the heart muscle
What is the most common cause of angina pectoris?
CAD (obstruction of the arteries due to atherosclerosis)
Types of Angina
- Stable
- Unstable
- Intractable or refractory
- Variant
- Silent
S/Sx of Angina Pectoris
- Tightness, squeezing, pressure or ache deep in the chest
- Sudden breathing difficulty (sometimes)
- Chest pain similar to indigestion
- A choking feeling in the throat
- Chest pain that radiates to the jaw, teeth or earlobes
- Heaviness, numbness, tingling or ache in the chest, arm, shoulder, elbow or hand usually on the left side
- Pain between the shoulder blades
Treatment of Angina Pectoris
Treatment seeks to decrease myocardial oxygen demand and increase oxygen supply
- Medications
- Oxygen
- Reduce and control risk factors
- Reperfusion therapy may also be done
Medications that treat angina pectoris
- Beta blockers
- Calcium channel blockers
- Antiplatelet and anticoagulant agents (aspirin, clopidogrel, ticlopidine)
- Glycoprotein IIB/IIIa agents
- Morphine (decreases O2 consumption, decreases anxiety, and lowers HR and BP
Acute Coronary Syndrome
Includes unstable angina and myocardial infarction
- An area of the myocardium is permanently destroyed (MI)
Unstable Angina
The plaque ruptures but the artery is not completely occluded
Clinical Manifestations of ACS/MI: Cardiovascular
- Chest pain or discomfort
- Irregular HR
- New onset murmur
- Jugular vein distention (JVD)
- HTN
Clinical Manifestations of ACS/MI: Respiratory
- SOB
- Dyspnea
- Tachypnea
- Crackles
- Pulmonary edema
Clinical Manifestations of ACS/MI: Gastrointestinal
- Nausea
2. Vomiting
Clinical Manifestations of ACS/MI: Genitonurinary
Decreased urinary output
Clinical Manifestations of ACS/MI: Skin
- Cool
- Clammy
- Diaphoretic
- Pale
Clinical Manifestations of ACS/MI: Neurologic
- Anxiety
- Restlessness
- Lightheadedness
- Decreased LOC
Diagnostics for ACS/MI
- Patient history, symptoms
- ECG
- Echocardiogram
- Laboratory tests (creatine kinase and isoenzymes, myoglobin, troponin)
Treatment for Acute MI (STEMI)
- Obtain diagnostic tests including ECG within 10 minutes of arrival
- Oxygen
- Aspirin, nitroglycerin, morphine, Beta-blocker (MONA)
- Angiotensin-converting enzyme inhibitor within 24 hours
- Evaluate percutaneous coronary intervention, if emergent and indicated should be performed in less than 60 minutes
- Evaluate for thrombolytic therapy, if indicated should be administered within 3 to 6 hours of the onset of symptoms
- As indicated: IV heparin or LMWH, clopidogrel or ticlopidine, Glycoprotein IIb/IIIa inhibitor (Repro, Integrilin)
- Bedrest
Pharmacologic Therapy for Acute MI
- Unfractionated heparin or LMWH (Lovenox) is prescribed along with platelet-inhibiting agents to prevent further clot formation (Also, may be placed on Warfarin)
- The analgesic of choice for acute MI is morphine administered in IV boluses to reduce pain and anxiety
- The use of ACE inhibitors decrease mortality rate and prevent remodeling of myocardial cells that is associated with onset of heart failure
- The purpose of thrombolytics is to dissolve the thrombus in a coronary artery, allowing blood to flow through the coronary again, minimizing the size of the infarction and preserving ventricular function
Potential Complications of ACS/MI
- Acute pulmonary edema
- Dysrhythmias
- Heart failure
- Cardiogenic shock
- Dressler’s syndrome
Nursing Interventions for patient with ACS/MI
- Relieving pain and other s/sx of ischemia
- Improving respiratory function
- Promoting adequate tissue perfusion
- Reducing anxiety
- Monitoring and managing potential complications
- Promoting home and community-based care
Invasive Coronary Artery Procedures
- Potential transluminal coronary angioplasty
- Coronary artery stent
- Atherectomy
- Brachytherapy
- Laser therapy
- Angio-jet
What is the purpose of a percutaneous transluminal coronary angioplasty?
Compresses the plaque against the arterial wall
What is the purpose of a coronary artery stent?
Used to maintain an open arterial lumen
What is the purpose of an atherectomy?
Shaves the plaque off vessel walls using a rotary cutting head
Invasive Coronary Artery Procedures: Possible Complications During the Procedure
- Dissection
- Perforation
- Embolism
- Hypersensitivity to the contrast dye
- Dysrhythmias
- Abrupt closure
- Vasospasm
- Acute MI
- Cardiac arrest
Invasive Coronary Artery Procedures: Possible Complications After the Procedure
- Bleeding at insertion site
- Retroperitoneal bleeding
- Hematoma
- Arterial occlusion
The Major Indications for CABG
- Alleviation of angina that cannot be controlled with medication or PCI
- Treatment of left main coronary stenosis or multi-vessel CAD
- Prevention and treatment of MI, dysrhythmias, or heart failure
- Treatment for complications from an unsuccessful PCI
What is a CABG?
Coronary Artery Bypass Graft
- Uses a section of the saphenous vein or internal mammary artery to create a connection between the aorta and the coronary artery beyond the obstruction to allow blood to perfuse the ischemic portion of the heart
- A median sternotomy is used to access the heart
Potential Complications of CABG
- Hypovolemia
- persistent bleeding
- cardiac tamponade
- fluid overload
- hypothermia
- hypertension
- tachydysrhythmias
- bradycardia
- cardiac failure
- MI
- impaired gas exchange
- neurologic changes
- stroke
- acute renal failure
- electrolyte imbalance
- hepatic failure
- infection
Post-Operative Nursing Management of CABG
- Monitor VS, O2 sat, hemodynamic parameters, HCT and Hgb, electrolytes, auscultate heart and breath sounds, assess skin color, skin temperature, peripheral pulses, and LOC
- Document cardiac rhythm and waveforms, measure I/O or urine, chest tube and fluids
- Administer IV fluids, blood products, inotropic, vasodilators, and/or antidysrhythmics as ordered
Aneurysms
- An abnormal dilation of a blood vessel
- Most are caused by arteriosclerosis, atherosclerosis, and HTN
Saccular Type Aneurysms
Are caused by a traumatic break in the vessel wall rather than weakness
Dissecting Type Aneurysms
Develop when a break or tear in the tunica intima and media allows blood to invade or dissect the layers of the vessel wall