Basic Physiological Needs

Basic physiological needs are essential for maintaining life, homeostasis, energy, tissue function, and normal elimination. Adequate oxygenation, nutrition, sleep, fluid and electrolyte balance, and urinary and bowel elimination allow body systems to function effectively. Nursing care focuses on early recognition of imbalance, maintenance of physiologic stability, prevention of complications, restoration of normal function, and patient education that supports safe self-care.

1️⃣ Oxygenation & Respiratory Function

🫁 Oxygenation Pattern

🔷 Oxygenation = delivery of O₂ to tissues

🔷 Airway + ventilation + diffusion + perfusion must function

🔷 Lungs bring O₂ in + remove CO₂

🔷 Circulation transports respiratory gases

🔷 Impaired oxygenation → cellular function ↓

🔷 Early recognition → complications ↓

🌬️ Ventilation & Gas Exchange

🔷 Ventilation = air movement in/out of lungs

🔷 Inspiration → thoracic volume ↑

🔷 Expiration usually passive at rest

🔷 Diffusion = gas movement across alveoli

🔷 Perfusion = pulmonary capillary blood flow

🔷 V/Q mismatch → gas exchange ↓

🩸 Oxygen Transport

🔷 Hemoglobin carries most blood O₂

🔷 Adequate RBC/Hgb → carrying capacity ↑

🔷 Cardiac output affects tissue O₂ delivery

🔷 Anemia → oxygen capacity ↓

🔷 Poor perfusion → tissue oxygenation ↓

🔷 Oxygenation depends on lungs + blood + circulation

⚠️ Factors Affecting Oxygenation

🔷 Age + development influence need

🔷 Illness/injury may disrupt function

🔷 Medications may alter physiology

🔷 Environment + activity affect demand

🔷 Lifestyle + nutrition influence stability

🔷 Assess individual baseline + risks

2️⃣ Respiratory Assessment & Oxygenation Monitoring

🔎 Respiratory Assessment

🔷 Assess rate + rhythm + depth + effort

🔷 Observe symmetry + accessory muscle use

🔷 Assess cough + sputum

🔷 Ask about dyspnea + activity tolerance

🔷 Inspect skin/lips for color changes

🔷 Compare findings with baseline

📊 Oxygenation Monitoring

🔷 SpO₂ estimates peripheral oxygen saturation

🔷 Interpret SpO₂ with clinical condition

🔷 Motion/poor perfusion may alter reading

🔷 Trend values > isolated measurement

🔷 ABG assesses gases + acid–base status

🔷 Deterioration → reassess patient + equipment

🩺 Breath Sounds & Findings

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

🚨 Respiratory Warning Signs

🔷 Severe dyspnea = urgent finding

🔷 Work of breathing ↑ → fatigue risk ↑

🔷 Cyanosis may indicate significant hypoxemia

🔷 New confusion/restlessness may reflect hypoxia

🔷 Markedly diminished airflow = concerning

🔷 Escalate worsening respiratory status

3️⃣ Impaired Oxygenation & Respiratory Problems

⚠️ Hypoxemia & Hypoxia

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🫁 Airway & Ventilation Problems

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🧍 Positioning & Breathing

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🚨 Deterioration & Escalation

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

4️⃣ Oxygen Therapy & Airway Management

💨 Oxygen Therapy

🔷 Oxygen = medication

🔷 Goal → correct hypoxemia + reduce work of breathing

🔷 Use prescribed target/concentration

🔷 Monitor response + comfort

🔷 Assess skin around device

🔷 Reassess after device/flow changes

😷 Oxygen Delivery Devices

🔷 Nasal cannula → low-flow O₂

🔷 Simple mask → moderate delivery

🔷 Venturi mask → precise concentration

🔷 Non-rebreather → high concentration

🔷 Device depends on patient need

🔷 Ensure correct fit + flow

🧼 Airway Clearance

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

⚠️ Oxygen Safety

🔷 Oxygen supports combustion → fire risk ↑

🔷 No smoking/open flames

🔷 Keep away from heat/sparks

🔷 Avoid petroleum products near oxygen

🔷 Secure cylinders safely

🔷 Follow facility oxygen precautions

5️⃣ Nutrition & Nutritional Requirements

🥗 Nutrition Fundamentals

🔷 Nutrition supports energy + growth + repair

🔷 Adequate intake ↔ immune + organ function

🔷 Needs vary with age + illness + activity

🔷 Balanced intake includes macro + micronutrients

🔷 Hydration is part of nutrition

🔷 Illness may ↑ needs while ↓ intake

⚡ Energy & Macronutrients

🔷 Carbohydrates = major energy source

🔷 Protein → tissue repair + immunity

🔷 Fat → concentrated energy + vitamin absorption

🔷 Protein needs may ↑ with healing

🔷 Energy excess/deficit alters weight

🔷 Balance intake with metabolic needs

🧬 Vitamins & Minerals

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🌱 Factors Affecting Nutrition

🔷 Age + development influence need

🔷 Illness/injury may disrupt function

🔷 Medications may alter physiology

🔷 Environment + activity affect demand

🔷 Lifestyle + nutrition influence stability

🔷 Assess individual baseline + risks

6️⃣ Nutritional Assessment & Malnutrition

🔎 Nutritional Assessment

🔷 Assess intake + appetite + food access

🔷 Review weight history + recent change

🔷 Assess swallowing + chewing

🔷 Inspect mouth + dentition

🔷 Consider culture + allergies + restrictions

🔷 Identify illness/medications affecting intake

⚖️ Anthropometric Findings

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

⚠️ Malnutrition Pattern

🔷 Malnutrition = inadequate/imbalanced intake

🔷 Unintentional weight loss = warning sign

🔷 Muscle wasting + weakness may occur

🔷 Poor healing + infection risk ↑

🔷 Older/ill patients may be high risk

🔷 Early intervention → outcomes ↑

🧪 Clinical & Laboratory Clues

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

7️⃣ Therapeutic Diets & Nutrition Support

🍽️ Therapeutic Diets

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🥤 Oral Nutrition Support

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

🧴 Enteral Nutrition

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

💉 Parenteral Nutrition

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

8️⃣ Feeding, Dysphagia & Aspiration Prevention

🥄 Safe Feeding

🔷 Position upright for oral intake

🔷 Confirm alertness + swallowing ability

🔷 Use small bites/sips + slow pace

🔷 Allow adequate time

🔷 Observe cough + wet voice + pocketing

🔷 Keep upright after meals when indicated

⚠️ Dysphagia Findings

🔷 Coughing/choking during meals

🔷 Wet/gurgly voice after swallowing

🔷 Pocketing + prolonged chewing

🔷 Repeated throat clearing

🔷 Recurrent respiratory infection may signal aspiration

🔷 Suspected dysphagia → swallow evaluation

🛡️ Aspiration Prevention

🔷 Upright position → aspiration risk ↓

🔷 Follow prescribed texture/liquid consistency

🔷 Supervise high-risk feeding

🔷 Avoid feeding with reduced alertness

🔷 Provide oral care

🔷 Stop feeding if aspiration signs occur

🤝 Feeding Assistance

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

9️⃣ Rest, Sleep & Sleep–Wake Patterns

😴 Sleep Pattern

🔷 Sleep = restorative physiologic state

🔷 Supports cognition + immunity + healing

🔷 Needs vary across life span

🔷 Illness/hospitalization may disrupt sleep

🔷 Sleep deprivation → function ↓

🔷 Rest ≠ sleep but both reduce demand

🌙 Sleep Stages & Cycles

🔷 NREM + REM alternate in cycles

🔷 NREM supports physical restoration

🔷 REM relates to dreaming + memory processing

🔷 Cycles repeat overnight

🔷 Sleep architecture changes with age

🔷 Frequent interruption → restoration ↓

⏰ Circadian Rhythm

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🌱 Factors Affecting Sleep

🔷 Age + development influence need

🔷 Illness/injury may disrupt function

🔷 Medications may alter physiology

🔷 Environment + activity affect demand

🔷 Lifestyle + nutrition influence stability

🔷 Assess individual baseline + risks

🔟 Sleep Disturbances & Promotion of Rest

⚠️ Sleep Disturbances

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🔎 Sleep Assessment

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

🌙 Sleep Hygiene

🔷 Maintain consistent sleep/wake schedule

🔷 Reduce caffeine near bedtime

🔷 Promote daytime activity

🔷 Reduce light + noise at night

🔷 Use calming bedtime routine

🔷 Support comfortable sleep environment

🛏️ Rest-Promoting Care

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

1️⃣1️⃣ Fluid Balance & Body Fluid Compartments

💧 Body Fluid Compartments

🔷 Body water = intracellular + extracellular

🔷 Intracellular fluid = inside cells

🔷 Extracellular = interstitial + intravascular

🔷 Water proportion varies by age/body composition

🔷 Infants generally have higher water proportion

🔷 Fluid shifts affect circulation + cells

⚖️ Fluid Regulation

🔷 Thirst promotes fluid intake

🔷 Kidneys regulate water + electrolytes

🔷 ADH → water reabsorption ↑

🔷 Aldosterone → sodium/water retention ↑

🔷 Natriuretic mechanisms → excretion ↑

🔷 Renal + hormonal control maintain balance

🔄 Fluid Movement

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

📊 Intake & Output

🔷 Measure oral + enteral + IV intake

🔷 Measure urine + drains + other losses

🔷 Urine output reflects renal perfusion/fluid status

🔷 Daily weight = sensitive fluid indicator

🔷 1 kg weight change ≈ 1 L fluid clinically

🔷 Trend I&O + weight + assessment

1️⃣2️⃣ Fluid Volume Deficit & Excess

⬇️ Fluid Volume Deficit

🔷 Deficit = fluid loss > intake

🔷 Vomiting/diarrhea/bleeding/diuresis contribute

🔷 Thirst + dry mucosa may occur

🔷 Tachycardia + orthostasis may develop

🔷 Urine output ↓ + concentration ↑

🔷 Severe deficit → perfusion + BP ↓

⬆️ Fluid Volume Excess

🔷 Excess = retained fluid > need

🔷 Edema + rapid weight gain may occur

🔷 Crackles/dyspnea → congestion concern

🔷 BP/JVP may ↑

🔷 Heart/kidney dysfunction may contribute

🔷 Monitor respiratory status closely

🔎 Assessment & Monitoring

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

💧 Fluid Management

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

1️⃣3️⃣ Electrolyte Balance & Imbalances

🧂 Sodium Balance

🔷 Sodium = major extracellular cation

🔷 Influences water balance + osmolality

🔷 Hyponatremia → neurologic symptoms possible

🔷 Hypernatremia → thirst + neurologic changes

🔷 Rapid/severe shifts = dangerous

🔷 Treat cause + monitor correction

🍌 Potassium Balance

🔷 Potassium = major intracellular cation

🔷 Critical for cardiac + muscle function

🔷 Hypokalemia → weakness + dysrhythmia risk

🔷 Hyperkalemia → dangerous dysrhythmias

🔷 Renal function strongly affects balance

🔷 Abnormal level → clinical/ECG monitoring

🦴 Calcium & Magnesium

🔷 Calcium supports bone + nerve + muscle function

🔷 Low calcium → tingling/cramps/tetany possible

🔷 High calcium → weakness/constipation possible

🔷 Magnesium supports neuromuscular/cardiac function

🔷 Renal/GI losses may alter levels

🔷 Significant imbalance → monitor + correct cause

⚠️ Electrolyte Safety

🔷 Electrolyte shifts affect heart + brain + muscles

🔷 Review renal function + medications

🔷 Avoid overly rapid correction when unsafe

🔷 Monitor ECG when clinically indicated

🔷 Recheck levels after treatment

🔷 Escalate severe cardiac/neurologic signs

1️⃣4️⃣ Acid–Base Balance & Fluid Replacement

⚖️ Acid–Base Basics

🔷 Body requires narrow pH range

🔷 Lungs regulate CO₂

🔷 Kidneys regulate HCO₃⁻ + H⁺

🔷 Acidosis = pH ↓

🔷 Alkalosis = pH ↑

🔷 Interpret pH + PaCO₂ + HCO₃⁻ together

🫁 Respiratory Imbalances

🔷 Respiratory acidosis → CO₂ retention

🔷 Hypoventilation → CO₂ ↑

🔷 Respiratory alkalosis → CO₂ loss

🔷 Hyperventilation → CO₂ ↓

🔷 Treat cause + support ventilation

🔷 ABG trends guide response

🧪 Metabolic Imbalances

🔷 Metabolic acidosis → HCO₃⁻ ↓

🔷 Acid gain/bicarbonate loss may cause acidosis

🔷 Metabolic alkalosis → HCO₃⁻ ↑

🔷 Vomiting/acid loss may cause alkalosis

🔷 Respiratory compensation may occur

🔷 Correct underlying cause + imbalance

💉 IV Fluid Replacement

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

1️⃣5️⃣ Urinary Elimination & Normal Voiding

🚻 Urinary Function

🔷 Kidneys form urine + regulate fluid/electrolytes

🔷 Voiding requires renal + neurologic + bladder function

🔷 Pattern varies with intake + habits

🔷 Hydration supports urine production

🔷 Mobility + privacy affect toileting

🔷 Change from baseline → assess

💧 Normal Urine Characteristics

🔷 Urine usually clear yellow/amber

🔷 Color varies with concentration + diet + medications

🔷 Odor changes require context

🔷 Cloudiness may reflect cells/crystals/infection

🔷 Output varies with intake + losses

🔷 Document significant changes

🔎 Urinary Assessment

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

🌱 Healthy Voiding

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

1️⃣6️⃣ Urinary Alterations & Incontinence

⚠️ Urinary Retention

🔷 Retention = incomplete/absent bladder emptying

🔷 Distention + discomfort may occur

🔷 Frequent small voids may indicate overflow

🔷 Medications/obstruction/neurologic causes contribute

🔷 Post-void residual helps assess

🔷 Untreated retention → infection/renal problems

💦 Urinary Incontinence

🔷 Incontinence = involuntary urine loss

🔷 Stress → leakage with cough/exertion

🔷 Urge → sudden need + leakage

🔷 Overflow → retention + dribbling

🔷 Functional → barriers prevent toileting

🔷 Management depends on type + cause

🦠 Urinary Infection

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🧭 Bladder Management

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

1️⃣7️⃣ Urinary Catheters & Urinary Care

🧴 Catheter Indications

🔷 Use catheter only for appropriate indication

🔷 Retention may require catheterization

🔷 Accurate output monitoring may justify selected use

🔷 Perioperative use depends on need

🔷 Avoid for staff convenience

🔷 Remove when indication ends

🧼 Catheter Care

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

📦 Drainage System Safety

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

⚠️ CAUTI Prevention

🔷 Avoid unnecessary catheter insertion

🔷 Use aseptic insertion technique

🔷 Maintain closed drainage system

🔷 Keep bag below bladder

🔷 Prevent dependent loops/obstruction

🔷 Review daily → remove ASAP

1️⃣8️⃣ Bowel Elimination & Normal Bowel Function

🚽 Bowel Function

🔷 Bowel elimination removes digestive waste

🔷 Peristalsis moves intestinal contents

🔷 Normal frequency varies individually

🔷 Diet + fluids + activity affect stool

🔷 Rectal filling triggers defecation reflex

🔷 Baseline pattern > arbitrary daily frequency

🥗 Factors Affecting Elimination

🔷 Fiber → stool bulk + motility ↑

🔷 Fluids support softer stool

🔷 Activity → motility ↑

🔷 Opioids/medications may cause constipation

🔷 Stress + routine affect bowel pattern

🔷 Privacy + positioning affect defecation

🔎 Stool & Bowel Assessment

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

🌱 Healthy Bowel Habits

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

1️⃣9️⃣ Constipation, Diarrhea & Bowel Alterations

🧱 Constipation

🔷 Constipation = difficult/infrequent hard stool

🔷 Low fiber/fluids/activity contribute

🔷 Opioids → motility ↓

🔷 Straining may cause complications

🔷 Prevention → fluids + fiber + mobility

🔷 Persistent change → assess cause

💦 Diarrhea

🔷 Diarrhea = frequent loose/watery stools

🔷 Fluid/electrolyte losses may ↑

🔷 Infection/medications/diet may contribute

🔷 Protect perineal skin

🔷 Monitor hydration + stool pattern

🔷 Severe/persistent diarrhea → evaluate

⚠️ Fecal Impaction & Incontinence

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🔎 Monitoring & Complications

🔷 Establish baseline + current pattern

🔷 Collect subjective + objective findings

🔷 Measure relevant physiologic indicators

🔷 Identify contributing factors + risks

🔷 Trend changes over time

🔷 Report significant deterioration promptly

2️⃣0️⃣ Bowel Management, Enemas & Ostomy Care

💊 Bowel Management

🔷 Establish usual bowel pattern

🔷 Promote fluids + fiber + activity

🔷 Schedule toileting around routine

🔷 Use laxatives only as indicated

🔷 Monitor response + adverse effects

🔷 Avoid unnecessary chronic stimulant use

🧴 Enemas & Rectal Interventions

🔷 Define normal pattern + purpose

🔷 Identify major influencing factors

🔷 Recognize common alterations

🔷 Assess relevant clinical findings

🔷 Prevent complications + maintain safety

🔷 Evaluate response + reinforce self-care

🩹 Ostomy Care

🔷 Stoma generally moist + pink/red

🔷 Assess stoma + peristomal skin

🔷 Pouch opening fits closely

🔷 Protect skin from effluent

🔷 Empty pouch before overly full

🔷 Teach self-care + body-image support

🤝 Education & Self-Care

🔷 Address underlying cause when possible

🔷 Support normal physiologic function

🔷 Monitor response + tolerance

🔷 Prevent treatment-related complications

🔷 Adjust plan to ongoing assessment

🔷 Teach patient/caregiver self-care

🏁 Conclusion

Basic physiological nursing care maintains oxygenation, nutrition, restorative sleep, fluid and electrolyte stability, and effective urinary and bowel elimination. Nurses recognize deviations from baseline, support normal physiologic processes, prevent aspiration, infection, dehydration, overload, electrolyte complications, and elimination problems, and teach patients practical strategies that promote safe independence and homeostasis.