LVN Comprehensive Study Notes

Cardiac Anatomy & Physiology

  • Mitral (Bicuspid) Valve – Left Atrioventricular (AV) Valve
    • Location: Between left atrium (LA) and left ventricle (LV).
    • Structure: Two cusps → “bi-cuspid.”
    • Function Cycle:
    – Valve open ➜ blood flows LA → LV during diastole.
    – LV contraction ↑ intraventricular pressure ➜ valve snaps shut, preventing retrograde flow to LA.
    • Clinical Significance: Incompetence causes mitral regurgitation → pulmonary congestion, left-sided HF.

  • Tricuspid Valve – Right AV Valve
    • Location: Right atrium (RA) ↔ Right ventricle (RV).
    • Function identical in timing to mitral valve but on right side.
    • Pathology: Tricuspid regurgitation frequently secondary to RV dilation (cor pulmonale).

  • Pulmonic (Pulmonary Semilunar) Valve
    • Location: Between RV & pulmonary trunk.
    • Diastole: Closed (prevents back-flow).
    • Systole: RV contraction ↑ pressure → valve opens → blood ejected into pulmonary arteries.
    • Closure creates S2 component (with aortic valve).

  • Aortic (Left Semilunar) Valve
    • Location: LV → Aorta.
    • Mirrors pulmonic valve mechanics on left side.
    • Pathology: Aortic stenosis produces systolic murmur, LV hypertrophy.

  • Valve Physiology Principle:
    • All valves respond passively to pressure gradients; no muscular effort.
    • Proper timing ensures one-way flow, maximizing cardiac output (CO = SV×HR\text{SV} \times \text{HR}).

  • Systemic Blood Flow Mnemonic – “TPMA”
    • Tricuspid → Pulmonic → Mitral → Aortic corresponds to sequence of valve contacts by a red blood cell beginning RA → systemic circuit.

Neuro-Respiratory Control Center

  • Medulla Oblongata
    • Houses respiratory rhythmicity centers, vasomotor center, and cardiac control center.
    • Lesion → immediate threat to life (apnea, loss of BP control).
    • Vital to reflexes: coughing, swallowing, vomiting.

Musculoskeletal Highlights

  • Hamstring Group (Posterior Thigh)
    • Biceps femoris – lateral.
    • Semitendinosus – middle.
    • Semimembranosus – medial.
    • Actions: Knee flexion, hip extension; critical for gait & posture.

  • Posterior Leg (Calf) Muscles
    • (Transcript focuses on posterior thigh; calf e.g., gastrocnemius, soleus – recall for completeness.)

  • Stimulating Bone Growth
    • Weight-bearing stress activates osteoblasts (Wolff’s Law).
    • Practical: Ambulation, resistance exercise, promotes calcium deposition → combats osteoporosis.

Range of Motion (ROM) & Joint Mechanics

  • Definition: Degree through which a joint can move without damage.

  • Execution Guidelines
    • Move to point of resistance or patient tolerance – stop at pain.
    • Support proximal & distal segments.
    • Incorporate flexion, extension, abduction, adduction, circumduction, pronation, supination.
    • Document degrees and patient response.

  • Major Motion Terms
    • Abduction: limb away from midline.
    • Adduction: toward midline.
    • Flexion/Extension: decrease/increase joint angle.
    • Pronation/Supination (forearm).
    • Inversion/Eversion (ankle).
    • Plantar-flexion/Dorsi-flexion (foot).
    • Hyper-extension: > neutral 180°.

Body Mechanics & Patient Handling

  • Lifting Principles
    • Bend at knees, not waist; keep back neutral.
    • Hold object close to center of gravity.
    • Use large muscle groups (thighs).
    • Pivot with feet, avoid twisting spine.
    • For pt transfers: use gait belt; count to three; utilize mechanical lifts when > 35 lb.

Gastrointestinal & Nutrition Concepts

  • Small-Intestine Lining: Villi & microvilli ↑ surface area → ↑ absorption.

  • Bile
    • Produced by liver, stored/concentrated in gallbladder.
    • Emulsifies fats, aiding lipase action.
    • Gallstones obstruct cystic duct → colicky pain.

  • Cholesterol-Lowering Diet
    • Restrict saturated fats (butter, lard, solid shortenings).
    • Encourage soluble fiber, plant sterols, omega-3s.

Fluid & Electrolyte Balance

  • Dehydration Manifestations
    • Skin turgor ↓, mucous membranes dry.
    • Vital signs: Tachycardia, hypotension (SBP < 90 mmHg90\,\text{mmHg}).
    • Neurologic: Dizziness, fatigue.
    • Urine output ↓ (< 30 mL/hr30\,\text{mL/hr}).

Respiratory – Hypoxia

  • Visible S/S
    • Anxiety/restlessness (early)
    • Cyanosis (late).
    • Tachypnea.
    • Use of accessory muscles.

Enteral & Airway Management

  • Tube Feeding
    • Verify placement (pH aspirate < 5.55.5).
    • Position: High-Fowler’s (60–90°) during feed & ≥30\ge 30 min post to reduce aspiration.
    • Swallowing technique: “Chin-to-chest” for dysphagia.

  • Tracheostomy Care
    • Secure new ties BEFORE removing old.
    • Maintain sterile field; suction PRN; monitor stoma skin.

Urinary Catheters & Specimen Collection

  • Catheter Types
    • Straight (in/out).
    • Indwelling (Foley).
    • Coude: Curved tip for males w/ BPH; generous lubrication essential.

  • Sterile Specimen
    • From port using sterile syringe & container; clamp 15 min prior.

  • Indication Summary
    • Urine diversion post-surgery, retention relief, precise output, medication instillation.

Vital Signs & Blood Pressure

  • Normal Ranges
    • Hypotension: < 90/6090/60 mmHg.
    • Normal: 120/80120/80 mmHg.
    • Pre-HTN: ≈ 126/86126/86 mmHg.
    • Hypertension: ≥ 130/80130/80 mmHg.

  • Apical Pulse
    • 5th ICS, L mid-clavicular line; count full 60 s.

  • BP Technique Reminders
    • Cuff center over brachial artery; gauge at 00; arm at heart level (not above).
    • Seated, legs uncrossed; may obtain lying, sitting, standing to assess orthostatics.

Infection Control Fundamentals

  • Chain of Infection

    1. Infectious Agent

    2. Reservoir

    3. Portal of Exit

    4. Mode of Transmission

    5. Portal of Entry

    6. Susceptible Host
      • Break any link → halt spread (hand hygiene most impactful).

  • Standard/Transmission-Based Precautions
    • PPE donning for contaminated linen: gloves minimum.
    • VRE (Vancomycin-Resistant Enterococci): Contact isolation, dedicated equipment, enviro cleaning.

  • Sterile Technique Example: Catheter insertion prevents introduction of microbes into bladder → UTI.

Restraints

  • Principles
    • Last resort; MD order required; temporary.
    • Least restrictive method first.
    • Two-finger breadth under restraint; tie with slip knot to bed frame.
    • Assess circulation, skin, need q15 min; release & ROM q2 h.

  • Appropriate Candidate: Pt repeatedly pulling central line, jeopardizing therapy.

Elder Abuse Recognition

  • Key Indicators
    • Unexplained crying; disproportionate fear of caregiver.
    • Bruising (face/posterior), lacerations, burns in varying stages.

  • Nursing Action: Report to charge nurse immediately; objective documentation.

Dementia & Delirium Care

  • Dementia Interventions
    • Consistent routine; simplified choices (≤2).
    • Calm environment, non-verbal cues, meaningful activities.

  • Agitation Management
    • Identify triggers, redirect, ensure safety.

  • Delirium
    • Acute fluctuating confusion (ex: asks for visitor who left 1 h ago).
    • Causes: Fever, brain injury, meds, electrolyte imbalance, sleep deprivation.

Transcultural Nursing

  • Definition: Delivering culturally congruent care; respect diversity in beliefs/practices.

  • Strategies
    • Assess cultural background, preferences, health beliefs.
    • Use interpreters PRN; incorporate rituals when safe.

  • Geographic Community Focus: Adapt interventions to local cultural/illness patterns.

Nursing Process (A.D.P.I.E.)

  • Assessment → Diagnosis → Planning → Implementation → Evaluation.

  • Intervention Planning occurs in Planning phase; LVN contributes data & implements under RN supervision.

Nursing Care Plan Development Steps

  1. Assessment (subjective & objective).

  2. Nursing Diagnosis (NANDA).

  3. Planning (SMART goals, prioritize via Maslow, safety).

  4. Implementation.

  5. Evaluation (goal met? modify?).

LVN Scope & Role

  • Nursing Practice Act: Legal document defining LVN scope.

  • LVN functions under RN; cannot perform independent admission assessment but collects data, implements care.

Maslow’s Hierarchy (application)

  1. Physiologic

  2. Safety/Security

  3. Love/Belonging

  4. Esteem

  5. Self-Actualization
    • Guides prioritization (e.g., airway > anxiety).

Developmental Stages (Erikson)

  • Infancy: Trust vs Mistrust (birth-1 yr).

  • Toddler: Autonomy vs Shame/Doubt (1-3 y).

  • Preschool: Initiative vs Guilt (4-6 y).

  • School-Age: Industry vs Inferiority (7-11 y).

  • Adolescence: Identity vs Role Confusion (12-19 y).

  • Young Adult: Intimacy vs Isolation (20-44 y).

  • Middle Adult: Generativity vs Stagnation (45-65 y).

  • Late Adult: Ego Integrity vs Despair (65+).

Safety & Emergency Preparedness

  • Home Safety for Older Adults
    • Remove throw rugs, improve lighting, grab bars, nonslip mats, proper shoes, smoke detectors, fire extinguisher, med alert systems.

  • Fire Extinguisher – PASS
    • Pull, Aim, Squeeze, Sweep.

Wound Irrigation Principles

  • Clean least → most contaminated.

  • Hold syringe 1 in1\,\text{in} above wound; steady pressure.

  • Use antiseptic outward from center.

Pain Assessment

  • Objective Signs: ↑ BP, HR, RR, perspiration/diaphoresis, guarding.

  • Subjective Data: Patient’s verbal report; always primary source unless unable.

Communication & Therapeutic Presence

  • Holding Space
    • Active listening, intermittent eye contact, silence, open body language.

  • Closed-Ended Question Example: Yes/No to obtain concise data.

Body Positioning Glossary

  • High Fowler’s: Supine, HOB 60–90°.

  • Semi-Fowler’s: HOB 30–45°.

  • Supine: Flat on back.

  • Prone: Flat, face-down.

  • Trendelenburg: Bed tilted head-down.

  • Reverse Trendelenburg: Bed tilted foot-down.

Chain-Link Review & Practical Breaks

  • Hand hygiene, PPE, proper disposal/linen handling, environmental cleaning, patient isolation – each disrupts transmission.

Summary Connection

These integrated concepts span A&P, nursing skills, developmental psychology, safety, and cultural competence. Mastery enables holistic, evidence-based care, guiding exam success and clinical excellence.