Fluids Flashcards
Crystalloids
Electrolyte solutions that can pass easily from the vascular space, used for short-term intravascular volume expansion and replacement of interstitial deficits, they can be hypotonic, hypertonic, isotonic
Replacement Solutions
Crystalloid. Similar in electrolyte composition to plasma and can be given in large volumes rapidly if IV is required, should be used in mixed electrolyte and water loss situation
0.9% Sodium Chloride
Crystalloid, isotonic, contains sodium, chloride and water. Used to treat hypochloraemia, short term gastric vomiting with HCl loss, hyponatraemia, hypercalcaemia, hypoadrenocorticism and is suitable for intraoperative fluid therapy
Hartmann’s Solution
Crystalloid, sodium lactate. Isotonic replacement solution, similar to plasma, contains Na, Cl, K, Ca and lactate. Used in electrolyte losses (acidosis), intestinal losses, diabetic ketoacidosis, renal failure, suitable for intraoperative fluid therapy
Hartmann’s Solution
May be a problem with liver disease due to lactate metabolism, not useful in cerebral oedema, or hypercalcaemia (since it contains calcium)
Hartmann’s Solution, Ringers
Do not use in the same line as blood products or sodium bicarbonate
Ringers
Similar to Hartmann’s but without lactate, used for replacement of fluid and electrolytes, prepyloric vomiting, patients with liver disease can be used in metabolic alkalosis
7.2% Saline
Hypertonic, high osmotic potential, draws fluid into the intravascular space with a small infused volume (good when rapid recirculating volumes need to be replenished),
7.2% Saline
Effective within 5min, but only works for 30 minutes
4mL/kg
Dose of 7.2% Saline
Maintenance Fluids
Cryastalloids, lower sodium load, addition of dextrose and glucose to make them isotonic but they can provide a hypotonic solution NOT energy supply
5% Dextrose
Crystalloid, water made isotonic with dextrose, rapidly passes out of the vascular space , for treating free water losses, can cause electrolyte imbalance if given too much or too fast
5% Dextrose
Cannot be used to treat hypovolaemia because there is no fluid retention in the vasculature
0.18% Saline, 4% Glucose
Crystalloid, mainly water with small amounts of Na and Cl, K will be required if it is used for maintenance, for treating free water loss but not used so much anymore
Colloids
Can be natural or synthetic, they contain large macromolecules that retain fluid within the vascular space by increasing oncotic pressure
Colloids
Retained in the circulation for a long period of time unless the vasculature is leaky, could be dangerous if they escape the vasulature and take fluid with them
Natural
Colloid, albumin, plasma, limited shelf life and difficult to get
Synthetic
Type of colloid most commonly used
Colloid
Used for treatment of hypovolaemia and for oncotic support of patients with hypoalbuminaemia
Dosing
Be very careful of this when administering colloid