Fluid and Electrolyte Imbalance - labmonk.com · Extra Cellular Fluid Volume Deficit (ECFVD) • A...
Transcript of Fluid and Electrolyte Imbalance - labmonk.com · Extra Cellular Fluid Volume Deficit (ECFVD) • A...
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Fluid and
Electrolyte Imbalance
Suman Kumar Mekap Asst. Professor in Pharmacology RIPS, Berhampur ©Labmonk.com
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Normal Anatomy and Physiology
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Why women have less water than men if
they are the same weight?
The water content of adipose (fat) tissue is less
than that of muscle, while women have more
adipose tissue at the effect of feminine
hormone.
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• Body fluids are distributed in two distinct area:
• intracellular fluid (ICF) 40% body
weight • Extracellular fluid (ECF) 20% body
weight • Interstitial fluid -15% body weight • Plasma -5% body weight
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Fluid and Electrolyte Balance between Body and Environment
• Intake of fluid and electrolytes X output
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Regulation of Fluid and Electrolyte
Passive transport mechanism
• Simple Diffusion through Lipid Layer • Simple Diffusion through Protein Layer • Facilitated or Carrier Mediated Diffusion
Active transport mechanism
• Primary Active Transport • Secondary Active Transport
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Simple Diffusion through Lipid Layer
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Simple Diffusion through Protein Layer
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Facilitated or Carrier Mediated Diffusion
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Special Types of Passive Transport 1. Bulk Flow
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2. Filtration
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3. Osmosis
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Primary Active Transport
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Secondary Active Transport
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Hormonal Regulation of Fluid Balance
• Aldosterone
• Antidiuretic hormone
• Natriuretic peptide (NP)
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Aldosterone • Hormone secreted from the zona glomerulosa cells of
adrenal cortex • Stimulates kidneys • Retain sodium • Retain water • Secrete potassium
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Antidiuretic hormone
• Also called arginine vasopressin (AVP).
• ADH is produced in neuron
cell bodies in supraoptic and paraventricular nuclei of the Hypothalamus, and stored in posterior pituitary.
• Physiological function • Promote the reabsorption
of water in the collecting duct.
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The natriuretic peptide family
• Four peptides of this family have been identified, including:
• Atrial natriuretic peptide (ANP) • Brain natriuretic peptide (BNP) • C-type natriuretic peptide (CNP) • Urodilatin Function: • Diuretic and natriuretic actions
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Atrial Natriuretic Peptide: Function
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The sensation of thirst
• Conscious desire for water • Major factor that determines fluid intake • Initiated by the osmo-receptors in hypothalamus that
are stimulated by increase in osmotic pressure of body fluids
• Also stimulated by a decrease in the blood pressure
through the receptor of baroreceptor
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Osmo-receptors stimulate AVP secretion and thirst
• These cells project to the paraventricular nuclei (PVN) and supraoptic nuclei (SON) to produce AVP secretion
• The vascular organ of the lamina
terminalis (OVLT) contains osmoreceptive neurons – also the subfornical organ (SFO) and the median preoptic n. (MnPO).
• These cells project to the
paraventricular nuclei (PVN) and supraoptic nuclei (SON) to produce AVP secretion
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The regulation of thirsty reaction
The stimulus sensed by osmoreceptor: • Not a change in the extracellular fluid osmolality • But a change in osmoreceptor neuron size or in the some intracellular substance.
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Abnormalities in the Regulation of Body Fluid.
• Extra Cellular Fluid Volume Deficit (ECFVD)
• Extra Cellular Fluid Volume Excess
• Extra Cellular Fluid Volume Shift
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Extra Cellular Fluid Volume Deficit (ECFVD)
• A decrease in intravascular and interstitial fluids.
• It is a common and serious fluid imbalance that
• results in vascular fluid volume loss (hypovolemia).
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Risk Factors
• Diabetic ketoacidosis
• Hemorrhage
• Difficulty to swallowing
• Aged
• Severe mentally ill patient
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Laboratory findings
• Increased Osmolality
• Increased or normal serum sodium level
• BUN (> 25 mg/d1)
• Hyperglycaemia (> 120 mg / dl)
• Increased specific gravity of urine
• Elevated hematocrit (>55%), Increased Specific gravity
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Management of Dehydration
• Pharmacologic Management
• Dietary management
• Nursing Management
• Nursing Diagnoses and Collaborative Problems
• Nursing Intervention
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Falls Precautions:
• Assess for orthostatic hypotension
• Assess muscle strength in legs
• Orient the patient to the environment
• Remind the patient to call for help before getting out of
bed or a chair
• Help the patient get out of bed or a chair
• Provide, or remind the patient to use, a walker or cane for
ambulating
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• Help the incontinent patient toilet every 1 to 2 hours
• Clean up spills immediately
• Provide adequate lighting at all times, especially at night
• Keep the call light within reach, and ensure that the patient can
use it
• Place the bed in the lowest position with the brakes locked
• Place objects that the patient needs within reach
• Ensure that adequate handrails are present in the patient's
room, bathroom, and hall
• Encourage family members or significant other to stay with the
patient
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Extra Cellular Fluid Volume Excess • ECFVE is increased fluid retention in the intravascular &
interstitial spaces
Extra Cellular Fluid Volume Shift • Fluid volume shift is basically a change in the location of
extra cellular fluid between the intravascular and the interstitial spaces.
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Electrolyte Balance and Imbalance
Sodium
• Hyponatremia
• Hypernatremia
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Hyponatremia Definition:
• – Commonly defined as a serum sodium concentration <135 meq/L
• – Hyponatremia represents a relative excess of water in relation to sodium
• Hyponatremia is the most common electrolyte disorder • Acute hyponatremia (developing over 48 h or less) are
subject to more severe degrees of cerebral edema • sodium level is less than 105 mEq/L, the mortality is over
50% • Chronic hyponatremia (developing over more than 48h)
experience milder degrees of cerebral edema.
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Types
• Hypovolemic hyponatremia
• Euvolemic hyponatremia
• Hypervolemic hyponatremia
• Redistributive hyponatremia
• Pseudohyponatremia
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Hypovolemic hyponatremia
• Develops as sodium and free water are lost and/or replaced by inappropriately hypotonic fluids
• Sodium can be lost through renal or non-renal routes • Nonrenal loss • GI losses • Vomiting, Diarrhea, fistulas, pancreatitis • Excessive sweating Third spacing of fluids • ascites, peritonitis, pancreatitis, and burns Cerebral salt-wasting syndrome • traumatic brain injury, aneurysmal subarachnoid hemorrhage,
and intracranial surgery • Must distinguish from SIADH
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Renal Loss • Acute or chronic renal insufficiency • Diuretics
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Euvolemic hyponatremia • Normal sodium stores and a total body excess of free water
• Psychogenic polydipsia, often in psychiatric patients • Administration of hypotonic intravenous (5% DW) or irrigation
fluids ( sorbitol, glycerin) in the immediate postoperative period • administration of hypotonic maintenance intravenous fluids • Infants who may have been given inappropriate amounts of free
water • bowel preparation before colonoscopy or colorectal surgery
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Hypervolemic hyponatremia
• Total body sodium increases, and TBW increases to a greater extent.
• Can be renal or non-renal • acute or chronic renal failure • dysfunctional kidneys are unable to excrete the ingested
sodium load
• cirrhosis, congestive heart failure, or nephrotic syndrome
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Redistributive hyponatremia
• Water shifts from the intracellular to the extracellular compartment, with a resultant dilution of sodium. The TBW and total body sodium are unchanged.
• This condition occurs with hyperglycemia • Administration of mannitol
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Hypernatremia
• Hypernatremia is usually due to water deficit Excess water loss :eg- heat exposure
• diabetes insipidus
• Impaired thirst:eg-primary hypodypsia, comatose
• Excessive Na retension
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Clinical feature • Excessive thirst, polyuria, nausea
• Muscular weakness, neuromuscular irritability
• Altered mental status, focal neurological deficit
occasionally coma or seizures
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Treatment
correct water deficit • water deficit = (plasma Na-140)/140*0.6*body wt in kg Rate of correction :
-Acute hypernatremia- 1mEq/L/hr
-Chronic hypernatremia-1mEq/L/hr or 10mEq/L over 24hr
-rapid correction may lead to cerebral oedema
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Potassium
• Hypokalemia
• Hyperkalemia
Calcium
• Hypocalcemia
• Hypercalcemia
Phosphorus
• Hypophosphatemia
• Hyperphosphatemia
Magnesium
• Hypomagnesemia
• Hypermagnesemia ©Labmonk.com
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