12/01/2026
Key points for IV fluids involve understanding their purpose (resuscitation, maintenance, replacement), knowing the types (crystalloids vs. colloids) and their effects (isotonic, hypotonic, hypertonic), careful patient assessment (vitals, labs, history, weight), precise prescription (type, rate, additives), and diligent monitoring for complications like fluid overload or site issues, always considering the patient's individual needs and comorbidities.
1. The 5 Rs (Purpose)
Resuscitation: Rapid volume replacement (shock, blood loss).
Routine Maintenance: Daily fluid/electrolyte needs (if NPO).
Replacement: Correcting existing deficits (vomiting, diarrhea).
Redistribution: Shifting fluid (edema, burns).
Reassessment: Ongoing monitoring and adjustment.
2. Types of Fluids
Crystalloids: Small molecules, easily distribute; common types (Normal Saline, Lactated Ringer's, Dextrose solutions).
Isotonic: Similar concentration to plasma (e.g., 0.9% NS).
Hypotonic: Lower solute; draws water into cells (e.g., 0.45% NS, D5W) – risk of cerebral edema.
Hypertonic: Higher solute; pulls water out of cells (e.g., 3% NS, D5NS) – risk of cell shrinkage, used for specific imbalances like severe hyponatremia.
Colloids: Larger molecules (proteins, starches) stay in bloodstream, increase volume quickly (used for severe shock).
3. Prescribing & Administration
Individualize: Patient weight, age, kidney/heart function, underlying condition (e.g., sepsis vs. post-op).
Specific Orders: Must include fluid type, additives (K+), rate, and duration.
Compatibility: Check if fluid is compatible with co-administered drugs.
4. Monitoring
Assess: Vitals, lung sounds, urine output, weight (daily).
Watch for Overload: Edema, crackles, elevated BP/RR, decreased O2 sat (especially in elderly).
Watch for Complications: Site issues (phlebitis, thrombosis), electrolyte shifts.
Stop Appropriately: Discontinue as patient's oral intake improves.
