The human body is composed of 2/3 water and 1/3 solids, with 40% of the solids being intracellular, 20% being interstitial, 20% being intravascular, and 10% being extracellular.
Central lines are suitable for irritant and non-irritant drugs, rapid fluid replacement, and long term use, but are unsuitable for short term use due to the risks.
Normal saline is not always the best idea, especially in cases of hypernatremia, problems with chloride balance, where the sodium content of medications is high, hypercalcaemia, tumour lysis syndrome, and acidosis.
Gravity infusions are suitable for simple fluid and drug administration, straightforward patients, and where accuracy is less important, but are unsuitable for time or rate critical drugs or vulnerable patients.
The patient appears to be in mild respiratory distress with blood pressure of 108/60 mmHg, pulse rate of 140 bpm, respiratory rate of 24/min, and temperature normal.
One year later, the patient presents to the emergency department with palpitations, dyspnea, and chest discomfort which began approximately 4 hours ago.
Sodium and fluid balance in injury involve ADH release, thirst, water retention, sodium retention, and activation of the renin-angiotensin-aldosterone system.
Assessing fluid needs involves considering general requirements for health, the volume status of the patient, fluid balance charts, and physical observation.