What should you know about types of IV fluid therapy?

Crystalloid fluids contain water and small dissolved particles and are commonly selected for dehydration or loss of fluid from vomiting, diarrhoea, heat exhaustion, or infection. Isotonic solutions are often used when fluid needs to remain mainly in the bloodstream and surrounding tissues. More concentrated or dilute solutions have specific uses and require careful clinical judgement.

Fluids may contain salts such as sodium and chloride, glucose, or other prescribed electrolytes. The choice depends on examination findings, blood tests, urine output, kidney and heart function, and the reason for fluid loss. IV therapy does not treat every cause of nausea or dizziness, and unnecessary fluid can also be harmful.

A clinician checks your symptoms, circulation, hydration, medicines, and medical history before selecting a solution and rate. The cannula site is observed for pain, swelling, redness, or leakage. Tell the team if you develop breathlessness, headache, shivering, pain, or worsening nausea while fluid is running.

When drinking is safe and effective, oral fluids may be preferred. Treatment for gastroenteritis or food poisoning may also involve rest, gradual drinking, and management of the underlying illness.

Seek urgent assessment for confusion, fainting, inability to keep fluids down, very little urine, severe weakness, blood in vomit or stool, or signs of sepsis such as fast breathing with marked deterioration. After an infusion, urgent review is needed for sudden breathlessness, facial swelling, or a painful, increasingly swollen IV site.

Ask why IV fluid is recommended, which type is planned, how kidney or heart conditions affect the choice, what monitoring is needed, and when you can safely return to drinking fluids.