Fluids and Electrolytes

Fluids and electrolytes maintain circulation, cellular function, neuromuscular activity, acid-base balance, and homeostasis. Imbalances may result from fluid loss, illness, organ dysfunction, medications, or IV therapy. Nursing care focuses on fluid assessment, safe replacement, IV therapy, electrolyte monitoring, ABG interpretation, and early recognition of life-threatening changes.

1️⃣ Body Fluid Compartments & Distribution

💧 Total Body Water

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🧫 Intracellular Fluid

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🩸 Extracellular Fluid

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

👶 Age & Body Composition

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

2️⃣ Fluid Movement & Tonicity

🔄 Osmosis

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

↔️ Diffusion & Filtration

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🧲 Hydrostatic & Oncotic Pressure

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⚖️ Tonicity & Cell Response

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

3️⃣ Fluid Regulation & Homeostasis

🧠 Thirst & Osmoregulation

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

💧 ADH

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🧂 RAAS & Aldosterone

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

❤️ Natriuretic Peptides

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

4️⃣ Fluid Assessment & Intake/Output

🔎 Fluid Assessment

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

📥 Intake

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

📤 Output

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⚖️ Daily Weight & Trends

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

5️⃣ Fluid Volume Deficit & Dehydration

⬇️ Deficit Pattern

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⚠️ Causes & Risks

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🔎 Deficit Findings

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

💧 Replacement & Monitoring

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

6️⃣ Fluid Volume Excess & Edema

⬆️ Excess Pattern

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🌊 Edema Formation

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🔎 Excess Findings

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🛡️ Management & Monitoring

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

7️⃣ Fluid Management & Replacement

🎯 Management Goals

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🥤 Oral & Enteral Replacement

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

💉 IV Replacement

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

📊 Evaluation of Response

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

8️⃣ IV Therapy & Vascular Access

💉 IV Therapy Principles

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🩸 Peripheral IV Access

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🧴 Central Venous Access

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🛡️ IV Safety

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

9️⃣ IV Fluid Types

⚖️ Isotonic Fluids

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⬇️ Hypotonic Fluids

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⬆️ Hypertonic Fluids

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

⚠️ Fluid Selection & Safety

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🔟 IV Therapy Complications

💧 Infiltration & Extravasation

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🔥 Phlebitis & Infection

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🌊 Fluid Overload

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

🚨 Other IV Complications

🔷 Define fluid/therapy purpose

🔷 Assess volume status + risk factors

🔷 Choose appropriate route/solution

🔷 Monitor VS + lungs + urine + weight

🔷 Prevent overload + line complications

🔷 Reassess response + adjust safely

1️⃣1️⃣ Sodium: Hyponatremia & Hypernatremia

🧂 Sodium Function

🔷 Sodium normal ≈ 135-145 mEq/L

🔷 Sodium = major extracellular cation

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hyponatremia

🔷 Sodium ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → confusion + seizures

🔷 Severe imbalance → complications ↑

🔷 Monitor water balance + neurologic status

🔷 Replace/correct cause safely as ordered

⬆️ Hypernatremia

🔷 Sodium ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → confusion + seizures

🔷 Severe imbalance → complications ↑

🔷 Monitor water balance + neurologic status

🔷 Reduce excess/treat cause safely

⚠️ Sodium Correction Safety

🔷 Correct Sodium gradually + safely

🔷 Review renal function + medications

🔷 Monitor water balance + neurologic status

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣2️⃣ Potassium: Hypokalemia & Hyperkalemia

🍌 Potassium Function

🔷 Potassium normal ≈ 3.5-5.0 mEq/L

🔷 Potassium = major intracellular cation

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hypokalemia

🔷 Potassium ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → weakness + dysrhythmias

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + ECG

🔷 Replace/correct cause safely as ordered

⬆️ Hyperkalemia

🔷 Potassium ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → weakness + dysrhythmias

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + ECG

🔷 Reduce excess/treat cause safely

❤️ Potassium Safety

🔷 Correct Potassium gradually + safely

🔷 Review renal function + medications

🔷 Monitor renal function + ECG

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣3️⃣ Calcium: Hypocalcemia & Hypercalcemia

🦴 Calcium Function

🔷 Calcium normal ≈ 8.5-10.5 mg/dL total

🔷 Calcium = bone + clotting + neuromuscular function

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hypocalcemia

🔷 Calcium ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → tetany or weakness

🔷 Severe imbalance → complications ↑

🔷 Monitor albumin/ionized Ca2+ + ECG

🔷 Replace/correct cause safely as ordered

⬆️ Hypercalcemia

🔷 Calcium ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → tetany or weakness

🔷 Severe imbalance → complications ↑

🔷 Monitor albumin/ionized Ca2+ + ECG

🔷 Reduce excess/treat cause safely

⚠️ Calcium Safety

🔷 Correct Calcium gradually + safely

🔷 Review renal function + medications

🔷 Monitor albumin/ionized Ca2+ + ECG

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣4️⃣ Magnesium: Hypomagnesemia & Hypermagnesemia

🧲 Magnesium Function

🔷 Magnesium normal ≈ 1.7-2.4 mg/dL

🔷 Magnesium = neuromuscular + cardiac regulation

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hypomagnesemia

🔷 Magnesium ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → reflex/rhythm changes

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + reflexes + ECG

🔷 Replace/correct cause safely as ordered

⬆️ Hypermagnesemia

🔷 Magnesium ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → reflex/rhythm changes

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + reflexes + ECG

🔷 Reduce excess/treat cause safely

⚠️ Magnesium Safety

🔷 Correct Magnesium gradually + safely

🔷 Review renal function + medications

🔷 Monitor renal function + reflexes + ECG

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣5️⃣ Phosphate: Hypophosphatemia & Hyperphosphatemia

🧪 Phosphate Function

🔷 Phosphate normal ≈ 2.5-4.5 mg/dL

🔷 Phosphate = ATP + bone + cellular energy

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hypophosphatemia

🔷 Phosphate ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → weakness + neuromuscular changes

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + Ca2+

🔷 Replace/correct cause safely as ordered

⬆️ Hyperphosphatemia

🔷 Phosphate ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → weakness + neuromuscular changes

🔷 Severe imbalance → complications ↑

🔷 Monitor renal function + Ca2+

🔷 Reduce excess/treat cause safely

🔄 Calcium-Phosphate Link

🔷 Correct Calcium gradually + safely

🔷 Review renal function + medications

🔷 Monitor albumin/ionized Ca2+ + ECG

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣6️⃣ Chloride: Hypochloremia & Hyperchloremia

🧂 Chloride Function

🔷 Chloride normal ≈ 98-106 mEq/L

🔷 Chloride = major extracellular anion

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Hypochloremia

🔷 Chloride ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → acid-base/volume changes

🔷 Severe imbalance → complications ↑

🔷 Monitor Na+ + HCO3- + fluid status

🔷 Replace/correct cause safely as ordered

⬆️ Hyperchloremia

🔷 Chloride ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → acid-base/volume changes

🔷 Severe imbalance → complications ↑

🔷 Monitor Na+ + HCO3- + fluid status

🔷 Reduce excess/treat cause safely

⚖️ Chloride & Acid-Base

🔷 Correct Chloride gradually + safely

🔷 Review renal function + medications

🔷 Monitor Na+ + HCO3- + fluid status

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣7️⃣ Bicarbonate & Buffer Systems

🧪 Bicarbonate Function

🔷 Bicarbonate normal ≈ 22-26 mEq/L

🔷 Bicarbonate = major extracellular buffer

🔷 Supports physiologic homeostasis

🔷 Kidney/GI function may alter level

🔷 Abnormal level → systemic effects

🔷 Interpret with clinical context

⬇️ Low HCO3-

🔷 Bicarbonate ↓ below reference range

🔷 Losses/dilution/organ dysfunction may contribute

🔷 Findings → acid-base disturbance

🔷 Severe imbalance → complications ↑

🔷 Monitor pH + PaCO2 + clinical cause

🔷 Replace/correct cause safely as ordered

⬆️ High HCO3-

🔷 Bicarbonate ↑ above reference range

🔷 Retention/excess intake/cell shifts may contribute

🔷 Findings → acid-base disturbance

🔷 Severe imbalance → complications ↑

🔷 Monitor pH + PaCO2 + clinical cause

🔷 Reduce excess/treat cause safely

⚖️ Buffering & Compensation

🔷 Correct Bicarbonate gradually + safely

🔷 Review renal function + medications

🔷 Monitor pH + PaCO2 + clinical cause

🔷 Recheck laboratory level after treatment

🔷 Avoid rapid overcorrection

🔷 Report severe neurologic/cardiac changes

1️⃣8️⃣ Electrolyte Replacement & Safety

💊 Replacement Principles

🔷 Define concept + normal physiology

🔷 Identify major influencing factors

🔷 Recognize common abnormal findings

🔷 Assess patient + relevant labs

🔷 Prevent complications

🔷 Reassess response + document

❤️ Cardiac Monitoring

🔷 Define concept + normal physiology

🔷 Identify major influencing factors

🔷 Recognize common abnormal findings

🔷 Assess patient + relevant labs

🔷 Prevent complications

🔷 Reassess response + document

🧪 Laboratory Monitoring

🔷 Define concept + normal physiology

🔷 Identify major influencing factors

🔷 Recognize common abnormal findings

🔷 Assess patient + relevant labs

🔷 Prevent complications

🔷 Reassess response + document

🚨 High-Risk Administration

🔷 Define concept + normal physiology

🔷 Identify major influencing factors

🔷 Recognize common abnormal findings

🔷 Assess patient + relevant labs

🔷 Prevent complications

🔷 Reassess response + document

1️⃣9️⃣ ABG Fundamentals & Normal Values

🩸 ABG Components

🔷 pH → acid/alkaline status

🔷 PaCO2 → respiratory component

🔷 HCO3- → metabolic component

🔷 PaO2 → arterial oxygen tension

🔷 SaO2 → arterial oxygen saturation

🔷 Interpret values together

📏 Normal Values

🔷 pH = 7.35-7.45

🔷 PaCO2 = 35-45 mmHg

🔷 HCO3- = 22-26 mEq/L

🔷 PaO2 often ≈ 80-100 mmHg

🔷 SaO2 often ≈ 95-100%

🔷 Ranges vary with lab + patient context

🫁 Oxygenation Values

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

⚠️ Sampling & Interpretation

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

2️⃣0️⃣ Stepwise ABG Interpretation

1️⃣ Check pH

🔷 pH <7.35 → acidemia

🔷 pH >7.45 → alkalemia

🔷 Normal pH may be compensated

🔷 Note side of 7.40

🔷 Start interpretation with pH

🔷 Do not use pH alone

2️⃣ Check PaCO2

🔷 PaCO2 ↑ → respiratory acid effect

🔷 PaCO2 ↓ → respiratory alkaline effect

🔷 Normal = 35-45 mmHg

🔷 Match direction with pH

🔷 Ventilation changes PaCO2

🔷 Compare with HCO3-

3️⃣ Check HCO3-

🔷 HCO3- ↓ → metabolic acid effect

🔷 HCO3- ↑ → metabolic alkaline effect

🔷 Normal = 22-26 mEq/L

🔷 Match direction with pH

🔷 Kidneys regulate HCO3-

🔷 Compare with PaCO2

4️⃣ Determine Compensation

🔷 Uncompensated → compensating value normal

🔷 Partial → pH abnormal + both components changed

🔷 Full → pH normal + both components changed

🔷 Compensation moves pH toward normal

🔷 Compensation ≠ cure

🔷 Unexpected pattern → mixed disorder

2️⃣1️⃣ Respiratory Acidosis

⬇️ ABG Pattern

🔷 pH ↓ + PaCO2 ↑

🔷 Primary problem = CO2 retention

🔷 HCO3- may ↑ with compensation

🔷 Hypoventilation is central mechanism

🔷 Assess oxygenation + ventilation

🔷 Treat cause

🫁 Common Causes

🔷 COPD/airflow obstruction

🔷 Opioids/CNS depression

🔷 Neuromuscular weakness

🔷 Severe lung disease

🔷 Inadequate mechanical ventilation

🔷 All cause hypoventilation/CO2 retention

🔎 Clinical Findings

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

🩺 Management Priorities

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

2️⃣2️⃣ Respiratory Alkalosis

⬆️ ABG Pattern

🔷 pH ↑ + PaCO2 ↓

🔷 Primary problem = excessive CO2 loss

🔷 HCO3- may ↓ with compensation

🔷 Hyperventilation is central mechanism

🔷 Assess oxygenation + trigger

🔷 Treat cause

🫁 Common Causes

🔷 Anxiety/pain

🔷 Hypoxemia

🔷 Fever/sepsis

🔷 Pregnancy

🔷 Excess mechanical ventilation

🔷 All cause hyperventilation/CO2 loss

🔎 Clinical Findings

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

🩺 Management Priorities

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

2️⃣3️⃣ Metabolic Acidosis

⬇️ ABG Pattern

🔷 pH ↓ + HCO3- ↓

🔷 Primary problem = acid gain/base loss

🔷 PaCO2 ↓ with compensation

🔷 Kussmaul breathing may occur

🔷 Assess perfusion + metabolism

🔷 Treat cause

🧪 Common Causes

🔷 DKA

🔷 Lactic acidosis/shock

🔷 Renal failure

🔷 Severe diarrhea

🔷 Selected toxins

🔷 Cause = acid gain or HCO3- loss

🔎 Clinical Findings

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

🩺 Management Priorities

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

2️⃣4️⃣ Metabolic Alkalosis

⬆️ ABG Pattern

🔷 pH ↑ + HCO3- ↑

🔷 Primary problem = acid loss/base gain

🔷 PaCO2 ↑ with compensation

🔷 Hypokalemia may coexist

🔷 Assess GI losses + diuretics

🔷 Treat cause

🧪 Common Causes

🔷 Vomiting

🔷 NG suction

🔷 Diuretics

🔷 Volume contraction

🔷 Excess alkali

🔷 Cause = H+ loss or HCO3- gain

🔎 Clinical Findings

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

🩺 Management Priorities

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

2️⃣5️⃣ ABG Compensation & Mixed Disorders

🔄 Compensation Pattern

🔷 Respiratory disorder → kidneys adjust HCO3-

🔷 Metabolic disorder → lungs adjust PaCO2

🔷 Lung response = faster

🔷 Renal response = slower

🔷 Compensation reduces pH disturbance

🔷 Compensation ≠ primary treatment

✅ Full vs Partial Compensation

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

⚠️ Mixed Disorders

🔷 Mixed = >1 primary disorder

🔷 PaCO2 + HCO3- pattern may be unexpected

🔷 pH may be extreme or near normal

🔷 Common in critically ill patients

🔷 Expected compensation helps detect mixture

🔷 Treat each underlying process

🚨 ABG Nursing Priorities

🔷 Assess airway + breathing + circulation

🔷 Monitor LOC + perfusion

🔷 Relate ABG to clinical cause

🔷 Correct oxygenation/ventilation when impaired

🔷 Repeat ABG/labs as indicated

🔷 Escalate severe pH disturbance

🏁 Conclusion

Fluid and electrolyte care requires accurate assessment of volume status, safe selection and administration of replacement fluids, careful IV monitoring, and early recognition of sodium, potassium, calcium, magnesium, phosphate, chloride, and bicarbonate abnormalities. ABG interpretation connects pH, PaCO2, HCO3-, and oxygenation with the patient's clinical condition so respiratory and metabolic disturbances can be recognized and treated promptly.