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Transcript of FLUIDS AND ELECTROLYTES Southeast Community College.
![Page 1: FLUIDS AND ELECTROLYTES Southeast Community College.](https://reader038.fdocuments.us/reader038/viewer/2022110401/56649e025503460f94aec00f/html5/thumbnails/1.jpg)
FLUIDS AND FLUIDS AND
ELECTROLYTESELECTROLYTES
Southeast Community College
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2 Compartments for Body Fluids
0 Intracellular – 40% of total body weight
0Extracellular – 20% of total body weight0 Intravascular (in blood vessels)
0 Interstitial (between blood vessels and cells)
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Body Fluids
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What is in body fluids?
0Water
0Electrolytes (ions capable of carrying an electric current0 Cations – positive charged ions0 Anions – negative charged ions
Electrolytes are measured in mEq/L
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How do body fluids move?
0Diffusion – solute moves from an area of high concentration to an area of low concentration
0Osmosis – fluid (water) moves across a semipermeable membrane from an area of lower concentration of solute to an area of higher concentration of solute
0Active Transport – movement of ions against osmotic pressure; requires energy
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DIFFUSION
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OSMOSIS
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ACTIVE TRANSPORT
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Question??
0 In what fluid compartment is the majority of our body fluid located?
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Types of Solutions
0Hypertonic – solution of higher osmotic pressure pulls fluid from cells
0 Isotonic – solution of same osmotic pressure expands body’s fluid volume without a fluid shift
0Hypotonic – solution of lower osmotic pressure; solution moves into cells
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Isotonic Solution
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Hypotonic Solution
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Hypertonic Solution
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Questions??
0Which type of solution if given to a patient would cause fluid to move from inside body cells (intracellular)?
0Where would the fluid move to?
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Hormonal Regulation of Body Fluids
0ADH (antidiuretic hormone) – stored in posterior pituitary gland and released in response to changes in blood osmolality – stimulates kidney to reabsorb water
0Aldosterone – released by adrenal cortex and acts on distal portion of renal tubule to increase reabsorption of Na (also causes loss of potassium)
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Fluid Output Regulation
Kidneys – produces 1200-1500 mL of urine/day; the
kidneys are the
primary regulators
of fluid output
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Other fluid output regulators
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Gastrointestinal Tract
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Question?
0Which of the following causes sodium reabsorption by the kidneys?0 Antidiuretic hormone0 Renin0 Insulin0 Aldosterone
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Terms
0Osmolarity – used to describe concentration of solutions
0Sensible fluid loss – fluid loss that is seen
0 Insensible fluid loss – fluid loss that is not perceived
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Electrolyte Regulation
Goal is to maintain electrical neutrality
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Sodium
0Most abundant in extracellular fluid0Major contributor to water balance0Nerve impulse transmission0Acid-base balance0Cellular chemical reactions0Normal level 135-145 mEq/L0Level influenced by dietary intake and aldosterone
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Sodium
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Potassium
0Most abundant in intracellular fluid0Necessary for glycogen deposits in the liver and
skeletal muscle0Conduction of nerve impulses0Normal cardiac rhythms0Skeletal and smooth muscle contraction0Normal level 3.5-5.0 mEq/L0Body does not conserve potassium well
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Potassium
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Foods with potassium
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Calcium
0Stored in bone (99%), 1% in ECF0Bone and teeth formation0Blood clotting0Cell membrane integrity0Cardiac conduction0Transmission of nerve impulses0Muscle contraction
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Foods with Calcium
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Magnesium
0Enzyme activities0Neurochemical
activities0Cardiac and skeletal
muscle excitability0Most found
intracellular (along with potassium)
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Anions – negative charge
0Chloride – major anion in ECF; dietary intake and kidneys regulate chloride level
0Bicarbonate – major chemical base buffer in the body; kidneys regulate bicarbonate
0Phosphate0 Assist with acid-base balance0 Helps to develop & maintain bones and teeth0 Neuromuscular action0 CHO metabolism
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Acid/Base Balance
Goal is to maintain balance
pH 7.35-7.45
Arterial pH is an indirect measurement of hydrogen ions – the greater the concentration of hydrogen ions the more acidic the solution and the lower the pH
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The pH Scale
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Acid-base regulators in the body
01. Buffer systems in the body (chemical regulators) – first to respond to an acid/base imbalance
02. Lungs – regulate CO2 by increasing/decreasing rate & depth of respirations
03. Kidneys – regulate excretion/retention of hydrogen ions and bicarbonate – last to respond but a more lasting effect
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Sodium Imbalances
Hyponatremia
Causes: increased sweating, GI losses (diarrhea), use of diuretics
Data: confusion, abdominal cramping, nausea & vomiting, tachycardia
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Risk for Hyponatremia
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Sodium Imbalances
Hypernatremia
Causes: increased ingestion of concentrated salt solutions, diabetes insipidus, water deprivation
Data: thirst, dry flushed skin, dry sticky tongue and mucous membranes, fever, convulsions
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Hypernatremia
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Potassium Imbalances
Hypokalemia
Causes: most common is diuretic use, also diarrhea, vomiting, extreme sweating
Data: weakness, fatigue, decreased muscle tone, weak irregular pulse
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Loss of Potassium
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Potassium Imbalances
Hyperkalemia (big cardiac problem)
Causes: primarily renal failure, also burns and trauma of cells (cause release of K+)
Data: dysrhythmias, paresthesias, weakness, abdominal cramps, diarrhea
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Hyperkalemia
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Calcium Imbalances
Hypocalcemia
Causes: decreased Ca++ intake, Vitamin D deficiency, hypoalbuminemia (because 50% of Ca++ is bound to protein)
Data: numbness and tingling of fingers, tetany, muscle cramps, pathological fractures
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Tetany
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Calcium Imbalances
Hypercalcemia
Causes: malignant disease, osteoporosis, prolonged immobilization
Data: N & V, constipation, weakness, can lead to cardiac arrest, low back pain (from kidney stones)
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Hypercalcemia
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Magnesium Imbalances
Hypomagnesemia
Causes: malnutrition, alcoholism, diarrhea, vomiting, nasogastric drainage
Data: muscle tremors, confusion
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Hypomagnesemia
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Magnesium Imbalances
Hypermagnesemia
Causes: renal failure, excessive intake
Data: hypotension, decreased rate and depth of respirations
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Hypermagnesemia
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Fluid Imbalances
Fluid Volume DeficitCauses: losses from GI tract (diarrhea, vomiting), loss of plasma or whole blood (burns, hemorrhage), fever, increased perspiration, decreased oral intake of fluids, diuretic useData: hypotension, tachycardia, poor skin turgor, thirst, dry mucous membranes, confusion, oliguria, weak pulse, lethargy
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Fluid Volume Deficit
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Fluid Imbalances
Fluid Volume Excess
Causes: congestive heart failure, renal failure, liver disease (cirrhosis), excessive Na intake
Data: edema (especially dependent), rapid weight gain, hypertension, neck vein distention, crackles in lungs
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Edema
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Jugular Venous Distention
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Arterial Blood Gases
0pH – measures H+ ion concentration in body fluids; 7.35-7.45
0paCO2 – partial pressure of carbon dioxide in arterial blood; 35-45 mm Hg
0Bicarbonate (HCO3) – major renal component; 22-26 mEq/L
0 (think of CO2 as an acid and HCO3 as a base)
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Arterial Blood Gases
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Acid Base Imbalances
Respiratory Acidosis
Causes: hypoventilation (atelectasis, pneumonia, cystic fibrosis, airway obstruction, chest wall injury), drug overdose, paralysis of respiratory muscles
Data: confusion, dizziness, warm/flushed skin, muscular twitching, ventricular dysrhythmias
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A cause of Respiratory Acidosis
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Acid Base Imbalances
Respiratory Alkalosis
Causes: hyperventilation (initial phase of asthma, anxiety, central nervous system infections, salicylate overdose)
Data: dizziness, confusion, tachypnea, numbness & tingling of extremities
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Respiratory Alkalosis
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Acid Base Imbalances
Metabolic Acidosis – high acid content in the blood; loss of sodium bicarbonate
Causes: starvation, diabetic ketoacidosis, renal failure, heavy exercise, drug use
Data: headache, lethargy, confusion, tachypnea (lungs are trying to compensate), dysrhythmias
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Metabolic Acidosis
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Acid Base Imbalances
Metabolic Alkalosis
Causes: excessive vomiting (most common), prolonged NG suctioning, drug use
Data: dizziness, dysrhythmias, numbness and tingling of fingers and toes, muscle cramps
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Assessment
0Age – infants, young children and elderly0Chronic diseases0History of GI problems (vomiting, diarrhea)0Any recent surgery or burns0Vigorous exercise/temperature extremes?0Dietary intake0Medication use, smoking, alcohol
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Assessment – Physical Exam
0 Weight0 Skin and mucous membranes0 Body temperature0 Orientation0 Distended neck veins0 Edema (sacrum, legs)0 Dysrhythmias, pulse rate, blood pressure0 Lung sounds, rate of respirations0 Vomiting? Diarrhea? Bowel sounds?0 Urine output (amount, color, specific gravity)0 Numbness, tingling, muscle cramps?
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Assessment – Lab Studies
Electrolyte levels, hematocrit, creatinine & BUN, urine specific gravity, ABG’s
Hematocrit is an indication of hydration status of the patient; it will elevate when fluid is lost and decrease when fluid is retained
Blood creatinine levels measure kidney function
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Potential Nursing Diagnoses
0Deficient fluid volume0Excess fluid volume0Risk for imbalanced fluid volume0 Impaired gas exchange0 Ineffective tissue perfusion0Decreased cardiac output0 Ineffective breathing pattern
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Patient Outcomes
Your patient as a fluid volume deficit. What would you write as an outcome?
What if your patient had a fluid volume excess?
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Nursing Interventions
0Daily weight – single most important indicator of fluid status
0 Intake & output – examine for trends0Enteral fluid replacement – oral replacement or
nasogastric, gastrostomy or jejunostomy tube feedings
0Fluid restriction (if fluid volume excess)0Parenteral replacement
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Daily Weights
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Nasogastric Tubes
Purposes of nasogastric tubes:
Gastric decompression
Gastric feeding
Administer medications
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Types of Nasogastric Tubes
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Types of nasogastric tubes
Levin – single lumen
Salem sump – larger lumen to remove gastric secretions and a smaller (usually blue) lumen to vent to air (do not clamp or irrigate the air vent)
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Insertion of a nasogastric tube
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Insertion of a nasogastric tube
0Clean technique0Place client in high Fowler’s position0Lubricate with water soluble lubricant0During insertion, if possible, have client take sips of
water 0Always verify placement post insertion and before
any feeding or irrigations (pH of stomach contents at 4)
0Use normal saline for irrigations
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Nursing Interventions
0Monitor intake and output (How would you calculate if performing nasogastric irrigations?)
0Apply water soluble lubricant to nares to prevent irritation
0Good oral hygiene0When removing nasogastric tube instruct client to
take a deep breath and hold it while removing the tube smoothly and quickly
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Keeping it all in balance