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Balance in Body Fluids and Electrolytes

Balance in levels of fluids and various chemicals in the body is essential.
Fluctuations in fluid intake and output can destabilize the balance between fluids and electrolytes.
The equilibrium between the acidity and alkalinity of body fluids is known as acid-base balance.

Total Body Water (TBW)
- Defined as the percent of body weight that consists of water.
- The human body requires sufficient water for survival.
- Approximately 60% of a healthy adult's weight is water.
Types of Body Fluid
- Body fluid is classified into two categories: intracellular and extracellular.
- Intracellular fluid (ICF): Majority of body fluid is found within cells.
- Extracellular fluid (ECF): Refers to fluid outside the cell, which includes:
- Interstitial fluid
- Intravascular fluid (blood plasma)
- Transcellular fluid (fluid in special compartments such as cerebrospinal fluid, pericardial fluid, etc.).
Fluid Movement
- Fluid moves between compartments through selectively permeable membranes using:
- Diffusion
- Active Transport
- Filtration
- Osmosis to maintain homeostasis.

Body fluids consist of water and solutes.
Solutes defined as substances that dissolve in a solvent (liquid).
- Crystalloids: Solutes that dissolve easily in a solvent.
- Colloids: Solutes that do not dissolve easily.
- Solutes include electrolytes and nonelectrolytes such as: proteins, oxygen, carbon dioxide, glucose.

Role of Electrolytes:
- Charged substances (ions) crucial for conducting electrical impulses across cells.
- Regulate fluid balance, hormone production, strengthen skeletal structures, and act as catalysts in nerve responses, muscle contractions, and metabolism of nutrients.

Sodium (Na+): 136-145 mEq/L
Potassium (K+): 3.5-5 mEq/L
Calcium (Ca2+): 8.5-10.5 mg/dL
Magnesium (Mg2+): 1.3-2.1 mEq/L
Chloride (Cl-): 95-105 mEq/L
Phosphate (PO4^3−): 1.7-2.6 mEq/L
At-risk Populations for Electrolyte Imbalances:
- Infants, children, older adults, patients with cognitive disorders and chronic illnesses.

Hyponatremia (Na+ < 136 mEq/L):
- Causes: Excess water in plasma or loss of sodium-rich fluids.
- Effects: Delayed depolarization of membranes; cells swell (cerebral edema).
- Risks include breading hypothermia, tachycardia, hypotension.
- Nursing Care: Monitor intake/output (I&O), vitals, fluid intake restrictions, and observe neurological status.
Hypernatremia (Na+ > 145 mEq/L):
- Causes: Water deprivation, excessive Na+ intake.
- Effects: Neuro, endocrine, and cardiac disturbances; cellular dehydration.
- Signs include muscle twitching, restlessness, irritability, and altered mental status.
- Nursing Actions: Report to a provider, encourage fluids, administer loop diuretics as needed.

Hypokalemia (K+ < 3.5 mEq/L):
- Causes: GI losses (vomiting, diarrhea), renal losses, excessive use of diuretics.
- Symptoms: Weak, irregular pulse, muscle weakness, confusion.
- Nursing: Report findings, replace potassium, monitor cardiac rhythm.
Hyperkalemia (K+ > 5.0 mEq/L):
- Causes: Increased intake, renal failure, cellular movement.
- Symptoms: Slow irregular pulse, irritability, abnormal ECG findings.
- Nursing: Report to a provider, decrease potassium intake, and may require dialysis.

Hypocalcemia (Ca2+ < 8.5 mg/dL):
- Causes: Chronic diarrhea, inadequate intake.
- Symptoms: Muscle spasms, tetany, seizers.
Hypercalcemia (Ca2+ > 10.5 mg/dL):
- Causes: Increased calcium intake.
- Symptoms: Weakness, lethargy, cardiac dysrhythmias.
Hypomagnesemia (Mg2+ < 1.3 mEq/L): Symptoms begin below 1 mEq/L.
Hypermagnesemia (Mg2+ > 2.1 mEq/L): Rare, often due to excessive intake of magnesium.

Hypophosphatemia (PO4^3− < 1.7 mEq/L): Causes include shifts into cells and decreased absorption.
Hyperphosphatemia (PO4^3− > 2.6 mEq/L): Usually due to impaired renal function.

Carbonic acid-bicarbonate system is the primary buffering system in extracellular fluid.
Phosphate buffering (primarily in cells).

Respiratory Regulation: Lungs control carbonic acid availability by regulating CO2 levels.
Renal Regulation: Kidneys excrete/retain hydrogen ions and bicarbonate ions to maintain acid-base balance.

Four types:
1. Respiratory Acidosis: CO2 retention leads to acidosis; the renal system compensates by excreting metabolic acids.
2. Respiratory Alkalosis: Caused by hyperventilation; renal compensation focuses on conserving acids.
3. Metabolic Acidosis: Loss of bicarbonate or accumulation of acids; compensation can include hyperventilatory response.
4. Metabolic Alkalosis: Due to excessive bicarbonate intake or loss of gastric acid; renal compensation allows for acid preservation.

Health Assessment Questions should cover:
- Fluid intake, dietary restrictions, recent health history (surgery, infections, etc.), and medications.
Vitals and Input/Output Monitoring: Vital signs changes in fever, tachycardia, blood pressure alterations, daily weight.
Edema Assessment: Visible signs in dependent body areas, classified based on indentation levels (pitting and brawny).
Skin Turgor and Mucous Membranes Assessment: Indicators of hydration status; dry, sticky membranes indicate a deficit.

Measurement of arterial blood gases (ABGs) provides insights on acid-base balance and oxygen saturation.
Interpreting ABGs involves checking pH, PaCO2, HCO3, and compensatory responses.

Fluid Replacement Strategies:
- Involves both oral and IV routes while considering patient preferences.
Electrolyte Replacement: Potassium and calcium are crucial for certain conditions.
Safety Monitoring: Assessing neurological status and vital signs, paying attention to new or unusual symptoms.

Maintain accurate records for IV therapy, medication administration, and patient responses during transfusions.

Continuous evaluations of goals and modifications in care plans are crucial for managing patients with fluid and electrolyte, and acid-base imbalances.
Documentation of assessments, interventions, and evaluations is essential for nursing practice to uphold patient safety and effective care.