Comprehensive Nursing Study Guide: Renal, Cardiac, and Hematologic Management
Hemodialysis and Peritoneal Dialysis Access, Methods, and Nursing Care
Temporary and Permanent Hemodialysis Access Sites:
Femoral Artery: Used for temporary access; least desirable and least common access site due to being located in a dirty area of the body with high infection risks.
Internal Jugular (IJ) Vein: Common site for temporary hemodialysis access via a neck catheter; catheters are not left in the neck permanently.
Chest Port: Alternative temporary/semi-permanent option for hemodialysis blood access.
Arteriovenous (AV) Fistula: Surgical connection between an artery and a vein used for permanent hemodialysis.
Assessment of an Arteriovenous (AV) Fistula:
Bruit (Auscultation):
Procedure: Place the bell of the stethoscope directly over the AV fistula site.
Expected Finding: Swooshing sound produced by the turbulent flow of blood moving between the high-pressure artery and low-pressure vein.
Thrill (Palpation):
Procedure: Place two fingers gently over the AV fistula site.
Expected Finding: Continuous, fast pulsation or vibrating feeling indicating robust blood flow through the vessel.
Hemodialysis Physiology and Clinical Considerations:
Mechanism: Blood is removed from the body, filtered through a dialyzer to extract toxins and waste, and returned to systemic circulation.
Hemodynamic Instability: Approximately of blood are removed, processed, and reinfused during a session, creating severe hemodynamic stress.
Complications: Cardiac dysrhythmias, rapid hypotension (blood pressure tanking), and high risk of blood clot formation.
Interventions & Monitoring:
If blood pressure drops critically low, hemodialysis must be paused or terminated immediately.
Obtain patient weight immediately before hemodialysis and calculate dry weight immediately after hemodialysis to assess total fluid volume removed.
Pre-dialysis and post-dialysis laboratory monitoring:
Electrolytes: Monitor Potassium () and Sodium (). High potassium levels cause lethal ventricular dysrhythmias leading to cardiac arrest.
BUN and Creatinine: Measure renal workload. Successful hemodialysis produces a decrease in both BUN and Creatinine values.
Glomerular Filtration Rate (GFR): Indicates effective kidney filtering capacity; an increase in GFR indicates improved filtration efficiency.
Peritoneal Dialysis (PD) Physiology and Clinical Considerations:
Mechanism: Employs the semipermeable peritoneal membrane inside the abdominal cavity to filter toxins and waste products via diffusion and osmosis.
Procedure: Dialysate solution is instilled from a bag into the peritoneal cavity via an indwelling peritoneal catheter, allowed to sit/dwell for a specified time, and then drained out by gravity.
Fluid Balance Monitoring:
Strictly track and document Input versus Output (I&O).
Total fluid Output must always exceed total fluid Input because the output includes the infused dialysate volume plus ultrafiltered fluid, urine, and metabolic waste.
Complications and Risks:
Peritonitis: Most common and most serious complication; infection of the peritoneal membrane that can rapidly progress to sepsis and death.
Structural Risks: Abdominal wall weakening, hernias, lateral distension, and fluid retention.
Lifestyle Considerations: Offers greater flexibility than hemodialysis (can be performed at home or overnight while sleeping), but requires a permanent external catheter sticking out of the abdomen, which presents physical and psychological challenges.
Heart Failure, Cardiac Diagnostics, and Pharmacotherapy
Acute Heart Failure Interventions:
Oxygen Therapy: Administered immediately to address hypoxemia and shortness of breath (SOB).
Loop Diuretics (Furosemide / Lasix):
Mechanism: Pulls excess fluid out of intravascular spaces and promotes renal excretion.
Pre- and Post-Administration Assessments: Check Blood Pressure and Heart Rate before and after administration. Monitor serum Potassium () closely due to the risk of loop-diuretic-induced hypokalemia.
Diagnostic Markers and Testing for Heart Failure:
B-Type Natriuretic Peptide (BNP):
Diagnostic biomarker specific to heart failure.
Serum levels rise proportionately as heart muscle fibers stretch and distend from acute or chronic fluid overload.
Echocardiogram:
Non-invasive ultrasound test used to measure Ejection Fraction (EF).
Ejection Fraction represents the percentage of blood pumped out of the ventricles with each cardiac contraction.
Troponin:
Cardiac-specific protein marker checked to identify acute myocardial tissue damage or rule out Myocardial Infarction (MI).
Cardiac Dysrhythmias and Electrical Disturbances
Pathophysiology of Dysrhythmias:
Defined as disorders of impulse formation, impulse conduction, or both within the cardiac conduction system, leading to alterations in heart rate, heart rhythm, or both.
Atrial Fibrillation (A-Fib):
Pathophysiology: Irritation or agitation of atrial tissue (triggered by stress, medications, or structural disease) causes chaotic atrial fibrillation rather than coordinated contractions.
Electrocardiogram (ECG) Characteristics:
Absence of a distinguishable or discrete P wave.
Indistinguishable T waves.
Atrial rate elevated up to approximately .
Ventricular response rate may be uncontrolled (fast) or controlled (slow).
Clinical Complications:
Blood pooling and swirling in non-contracting atria leads to thrombus formation.
Untreated A-Fib increases the risk of heart failure, myocardial ischemia, and embolic/hemolytic events such as cerebrovascular accidents (strokes).
Management Strategies:
Rate/Rhythm Control: Administration of Beta-Blockers (medications ending in "-olol").
Stroke Prevention: Administration of systemic Anticoagulants to prevent clot formation.
Cardioversion: Delivery of synchronized electrical energy (joules/shock) to reset the heart's conduction system back into regular sinus rhythm if pharmacotherapy fails.
Atrial Flutter (A-Flutter):
Displays a rhythm pattern similar to A-Fib but presents with a more regular, classic "sawtooth" atrial conduction layout.
Sinus Rhythms and Variations:
Sinus Bradycardia: Normal conduction pathway with a heart rate less than .
Sinus Tachycardia: Normal conduction pathway with a heart rate greater than .
Sinus Arrhythmia: All ECG intervals (P wave, PR interval, QRS complex) meet normal parameters except the distances between consecutive QRS complexes vary slightly.
Coronary Artery Disease, Angina, and Cardiomyopathy
Coronary Artery Disease (CAD) Risk Factors:
Modifiable Risk Factors: Smoking cessation, dietary modifications, exercise, weight reduction, lowering serum cholesterol, managing Hypertension (HTN), and managing Diabetes Mellitus (DM).
Non-Modifiable Risk Factors: Increasing Age and Gender.
Angina Pectoris:
Stable Angina: Predictable chest pain that occurs with physical exertion or stress and subsides completely with rest or cessation of movement.
Hemodynamic Impact of Cardiac Output Decline:
Valvular disorders and heart failure diminish stroke volume and overall cardiac output, leading to reduced arterial blood pressure and systemic tissue hypoxia.
Activity Intolerance: Primary clinical manifestation seen in heart failure; patients experience exhaustion or dyspnea attempting basic tasks like climbing stairs or walking across a room.
Cardiomyopathy Classifications:
Diseases of the myocardium associated with structural and functional cardiac dysfunction, categorized into three types:
Dilated Cardiomyopathy
Hypertrophic Cardiomyopathy
Restricted Cardiomyopathy
Right-Sided vs. Left-Sided Heart Failure:
Right-Sided Heart Failure:
Pathophysiology: Inability of the right ventricle to pump blood forward, preventing accommodation of venous return.
Manifestations: Systemic and peripheral venous congestion, Jugular Vein Distension (JVD), peripheral edema, generalized weakness, and fluid weight gain.
Left-Sided Heart Failure:
Pathophysiology: Failure of the left ventricle causes blood back-up into the pulmonary circulation.
Manifestations: Pulmonary congestion, shortness of breath, dyspnea, decreased levels, and bibasilar crackles.
Pulmonary Edema: Severe acute decompensation resulting in fluid accumulation in the interstitial spaces and alveoli of the lungs, causing acute respiratory failure and drowning.
Acute Kidney Injury, Electrolyte Imbalances, and Emergency Care
Acute Kidney Injury (AKI) Criteria:
Widely accepted diagnostic criterion for AKI is a or greater increase in serum Creatinine above baseline levels.
Life-Threatening Electrolyte Emergencies:
Hyperkalemia:
Most immediate, life-threatening fluid and electrolyte emergency in renal disorders.
Triggers lethal ventricular dysrhythmias and sudden cardiac arrest.
Severe hyperkalemia (e.g., serum potassium level of ) requires urgent, emergency hemodialysis to remove potassium immediately.
Sodium Polystyrene Sulfonate (Kayexalate):
Oral laxative suspension administered to exchange sodium for potassium ions in the intestine to treat hyperkalemia.
Requires several hours to lower serum potassium levels; strictly contraindicated as a standalone treatment for acute, life-threatening hyperkalemia.
Hypokalemia:
Presents a significant risk for cardiac dysrhythmias, but progresses less rapidly than hyperkalemia.
Cardiac Catheterization Post-Procedure Interventions
Diagnostic Purpose: Visualizes coronary arteries to identify arterial blockages or structural distress.
Access Routes: Femoral Artery or Radial Artery.
Post-Procedure Nursing Priorities:
Bleeding Monitoring: High arterial pressure creates a severe risk for hemorrhage at the puncture site.
Femoral Access Interventions: Maintain the patient strictly in a supine position and apply direct pressure to the access site.
Radial Access Interventions: Prohibit the patient from lifting objects with the affected arm to prevent spikes in local vascular pressure.
Neurovascular Assessments: Perform regular bilateral distal pulse checks below the insertion site.
Cardiac Auscultation: Auscultate heart sounds post-procedure to evaluate for new heart murmurs.
Anemia Types, Interventions, and Renal Nutrition
Hemolytic Anemia Types: Examples include Sickle Cell Anemia and Thalassemia.
Nursing Interventions for Anemia:
Manage and reduce fatigue by balancing daily rest periods with activity.
Provide balanced nutrition (high-vitamin, lower-fat intake).
Iron Supplementation: Oral iron supplements must be administered concurrently with Vitamin C (ascorbic acid) or Vitamin C-rich foods to optimize gastrointestinal absorption.
Maintain tissue perfusion and promote continuous compliance with prescribed drug regimens.
Renal Diet in End-Stage Kidney Disease (ESKD):
Glomerular Filtration Rate (GFR) is severely decreased in ESKD.
Dietary Components: Fluid restrictions, low potassium intake, low sodium intake, high calories, and supplemental vitamins.
Goal: Minimize the accumulation of metabolic waste products while maintaining adequate tissue nutrition.
Urolithiasis and Continuous Bladder Irrigation (CBI)
High-Oxalate Foods to Avoid:
Patients with urolithiasis or nephrolithiasis (urinary/kidney stones) composed of oxalate must decrease consumption of: chocolate, spinach, root beer, and potatoes with skin.
Continuous Bladder Irrigation (CBI) Management:
Indication: Postoperative management following a Transurethral Resection of the Prostate (TURP) using a three-way urinary catheter.
Normal Findings: Output should normally appear light pink-tinged.
Complications: Presence of explicit blood clots or bright red blood in the drainage tubing.
Nursing Intervention: If blood clots or dark red drainage are observed, immediately increase the irrigation flow rate to flush the bladder, clear clot formation, and prevent catheter occlusion.
Questions and Discussion
Exam Content Breakdown:
The upcoming examination contains approximately questions directly covering burn injuries.
Students should reference the course blueprint to prioritize study topics.
Exam Preparation Strategies:
Read every examination item twice before reviewing answer options, paying close attention to negatively phrased stems such as "which needs further teaching?" to avoid selecting incorrect responses.