FON.15.05.2020FN fluid and electrolyte balance.pptx
1. Course : B.Sc Nursing
Subject : Fundamentals of Nursing
Unit : X
Topic : Fluid and Electrolyte Balance
2.
3. OBJECTIVES
• At the end of the session the learner will be able to
• describe how fluid and electrolytes are regulated to
maintain homeostasis.
• discuss the fluid and electrolyte and acid base balances.
• Explain about the regulation of fluid and electrolyte
balances
4. INTRODUCTION
Fluid, electrolyte and acid base balance within
the body maintain health and function in all body
systems. These balances are maintained by the
intake and output of water and electrolytes, their
distribution in the body and regulated by the renal
and pulmonary system.
7. Intracellular fluid
ICF comprises all fluid within the cells of the body,
about 42% of total body weight.
Extracellular fluid
ECF is all the fluid outside the cell.
8. COMPOSITION OF BODY FLUIDS
As water moves throughout the body, it contains
substances
Electrolyte
Minerals
9. MOVEMENT OF BODY FLUID
Each body compartment is separated by a cell wall
and capillary membrane. Fluids and solutes
move across these membranes by four
processes.
DIFUSSION
OSMOSIS
FILTRATION
ACTIVE TRANSPORT
10.
11.
12.
13.
14. REGULATION OF BODY FLUIDS
Fluid intake
Fluid output
Hormonal influence
20. ATRIAL NATRIURETIC PEPTIDE
It is a hormone secreted from atrial cells of the
heart in response to atrial stretching and an
increase in circulating blood volume.
It acts like a diuretic that causes sodium loss and
inhibits the thirst mechanism.
Inhibits the secretion of ADH and Aldosterone.
21. ELECTROLYTES
Electrolytes are the substances found in ECF
and ICF whose molecules dissociate into
electrically charged particles known as ions
when placed in water.
22. DEFINITIONS
IONS : Ions are electrically charged particles
CATIONS : Cations are positively charged
particles. E.g.- Na , K+, Ca2+ etc.
ANIONS : Anions are negatively charged
particles. E.g.- Cl-, PO4, HCO3-
ICF- K, Mg, PO4-, (K as a main ion)
ECF- Na, Ca, Cl (Na as a main ion)
23. ACID BASE BALANCE
ACID
Any compound which forms H⁺ ions in solution
(proton donors)
eg: Carbonic acid releases H⁺ ions
BASE
Any compound which combines with H⁺ ions in
solution (proton acceptors)
eg: Bicarbonate (HCO3⁻) accepts H+ ions
24. ACID-BASE BALANCE
• Normal blood pH: 7.35-7.45
• Maintenance of blood pH—Important
homeostatic mechanism of the body.
• If pH <7.35--------- Acidosis
Ph >7.45---------Alkalosis
25. RESPIRATORY ACID-BASE CONTROL
MECHANISMS
When chemical buffers alone cannot prevent
changes in blood pH, the respiratory system is
the second line of defence against changes.
Eliminate or Retain CO₂
Change in pH are RAPID
Occuring within minutes
PCO₂ ∞ VCO₂/VA
26. RENAL ACID-BASE CONTROL
MECHANISMS
The kidneys are the third line of defence
against wide changes in body fluid pH.
– movement of bicarbonate
– Retention/Excretion of acids
– Generating additional buffers
Long term regulator of ACID – BASE balance
May take hours to days for correction
27. RISK FACTORS AFFECTING FLUID,
ELECTROLYTE AND ACID-BASE BALANCE
Age Very young, very old
Gender Women
Environment Hot weather
Chronic disease Cancer, Cardiovascular
disease, congestive heart
failure, renal disease, COPD
Trauma Injuries, burns
Gastrointestinal
losses
Gastroentritis, nasogastric
suctioning
28. MEDICATIONS CAUSE FLUID,
ELECTROLYTE AND ACID BASE
IMBALANCE
Diuretics
Steroids
Potassium supplements
Respiratory center depressants
Antibiotics
Calcium carbonate
Magnesium hydroxide
Non steroidal anti-inflammatory drugs
30. CONCLUSION
• Electrolytes are minerals in your body that have an
electric charge. They are in your blood, urine, tissues,
and other body fluids. Electrolytes are important
because they help
• Balance the amount of water in your body
• Balance your body's acid/base (pH) level
• Move nutrients into your cells
• Move wastes out of your cells
• Make sure that your nerves, muscles, the heart, and
the brain work the way they should
• Sodium, calcium, potassium, chloride, phosphate, and
magnesium are all electrolytes. You get them from the
foods you eat and the fluids you drink.
31. REFERENCES
• Potter and Perry's Fundamentals of
Nursing (2017) 2nd Edition, Elsevier
Publication, page No.970-981.
• Kozier & Erb's Fundamentals of Nursing (10th
Edition), Pearson publication.
• Sr Nancy, Principles & Practice Of Nursing,
Nursing Arts Procedures (2006), NR
Brothers Publication.