PP - FLUID BALANCE - GADDIS - Jan 17 Flashcards
BODY FLUID FUNCTION (8)
• MAINTAINS BLOOD VOLUME
• REGULATES BODY TEMP
• TRANSPORTS MATERIAL TO AND FROM CELLS
• AQUEOUS MEDIUM FOR CELLULAR METABOLISM
• ASSISTS DIGESTION OF FOOD THROUGH HYDROLYSIS
• SOLVENT - SOLUTES ARE AVAILABLE FOR CELL FUNCTION
• SERVES AS MEDIUM FOR THE EXCRETION OF WASTE
• BODY FLUIDS ARE IN CONSTANT MOTION, MAINTAINING LIVING CONDITIONS FOR BODY CELLS
BODY COMPOSITION
Infants
Adults
Older Adults
Infants: 70 - 80 % Water / 20 - 30 % Solids
Adults: 50 - 60 % Water / 40 - 50 % Solids
Older Adults: 45 - 55 % Water / 45 - 55 % Solids
THE AMOUNT OF FLUID IN THE BODY IS AFFECTED BY SEVERAL THINGS
Age
Gender
Obesity
How does age effect the amount of fluid in the body
• AS WE AGE OUR MUSCLE MASS DECLINES AND THE PROPORTION OF FAT CELLS WITHIN THE BODY INCREASES
MUSCLE CELLS HAS A HIGHER CONTENT OF FLUID THAN
FAT CELLS
How does gender effect the amount of fluid in the body
WOMEN TYPICALLY HAVE MORE FAT CELLS THAN MEN
Which patients can be expected to dehydrate most quickly
Preemies / newborns / older adults
Especially older obese women
Preemies and newborns can dehydrate quickly or this could happen quickly as well
Overhydration
BODY FLUID COMPARTMENTS
Intracellular
Extracellular
INTRACELLULAR
INSIDE THE CELLS
EXTRACELLULAR
OUTSIDE THE CELLS
WHAT IS FUNCTION OF ECF
TRANSPORTS NUTRIENTS TO THE CELL AND
CARRIES WASTE PRODUCTS AWAY FROM THE CELLS 
HOW DOES ECF TRANSPORT NUTRIENTS / WASTES TO / FROM CELLS
BY MEANS OF THE CAPILLARY BED.
ECF (EXTRACELLULAR FLUID) FURTHER DIVIDED (3)
• INTERSTITIAL
• INTRAVASCULAR
• TRANSCELLULAR
INTERSTITIAL
• SURROUNDS EACH CELL OF THE BODY, EVEN BONE CELLS
• INTRAVASCULAR
• SURROUNDS THE CELLS OF THE BLOOD – MOST OF THE BLOOD VOLUME
• TRANS CELLULAR FLUID ENCLOSED BY
ENDOTHELIAL MEMBRANE
TRANS CELLULAR INCLUDES (9)
• CEREBROSPINAL
• PERICARDIAL
• PANCREATIC
• PLEURAL
• INTRAOCULAR
• BILIARY
• PERITONEAL
• SYNOVIAL FLUIDS • BOWEL MUCUS
WHICH FLUID IS GENERALLY NOT SUBJECTED TO GAINS AND LOSSES
TRANSCELLULAR
THIRD SPACE SYNDROME
FLUID SHIFTS FROM THE VASCULAR SPACE INTO AN AREA WHERE IT IS NOT READILY ACCESSIBLE AS EXTRACELLULAR FLUID
EX’S OF THIRD SPACE SYNDROME
• ASCITES
• HYDROCEPHALUS
• PLEURALEFFUSIONS
• PERICARDIAL TRANSCELLULAR EFFUSIONS ???
HYDROSTATIC PRESSURE
HYDROSTATIC PRESSURE
OSMOTIC PRESSURE
PRESSURE BY SOLUTES IN SOLUTION
ONCOTIC PRESSURE
• “COLLOID PRESSURE”
• PRESSURE DUE TO ALBUMIN IN BLOOD
OSMOLALITY
CONCENTRATION OF SOLUTES/KG SOLUTION
OSMOLARITY
NUMBER OF OSMOLES OF SOLUTE PER LITER OF SOLUTION
HYDROSTATIC PRESSURE SYMBOLIZES THE
PUSHING OUTWARD OF HYDROSTATIC PRESSURE PUSHING H2O FROM ECF (CAPILLARY) INTO ICF
OSMOTIC PRESSURE
PULLING FORCE OF OSMOTIC (ONCOTIC) PRESSURE CREATED BY SOLUTES (ALBUMIN), WHICH FAVORS FLUID MOVEMENT FROM ICF INTO ECF (CAPILLARY)
STARLING LAW OF CAPILLARIES EXPLAINS THE MOVEMENT OF
FLUID THAT OCCURS AT CAPILLARY BEDS
FLUID THAT OCCURS AT CAPILLARY BEDS OUTCOME OF 2 MAJOR OPPOSING FORCES:
- HYDROSTATIC PRESSURE
- OSMOTIC PRESSURE
ALTERATIONS IN FORCES CAN LEAD TO
EDEMA
EDEMA (2) WAYS
- INCREASED BLOOD VOLUME = INCREASED HYDROSTATIC PRESSURE
- LOWER ALBUMIN = REDUCED OSMOTIC PRESSURE
- INCREASED BLOOD VOLUME =
INCREASED HYDROSTATIC PRESSURE
- LOWER ALBUMIN =
REDUCED OSMOTIC PRESSURE
NORMAL PLASMA OSMOLALITY ~
290 MOSM
MOSM means…
OSMORECEPTORS
* LOCATED IN
HYPOTHALAMUS
OSMORECEPTORS
* LOCATED IN HYPOTHALAMUS AND STIMULATED BY
INCREASED PLASMA CONCENTRATION
THIRST MECHANISM AND ANTIDIURETIC HORMONE (ADH) RELEASE INITIATED BY
OSMORECEPTORS
ADH (ALSO KNOWN AS
VASOPRESSIN
ADH (ALSO KNOWN AS VASOPRESSIN)
* SYNTHESIZED BY
HYPOTHALAMUS
ADH (ALSO KNOWN AS VASOPRESSIN)
* RELEASED FROM
POSTERIOR PITUITARY
ADH (ALSO KNOWN AS VASOPRESSIN)
* STIMULATES
KIDNEY NEPHRON TO REABSORB MORE WATER
RENIN RELEASED FROM
KIDNEYS
ANGIOTENSIN I CONVERTED TO
ANGIOTENSIN II
RENIN RELEASED FROM KIDNEYS
CONVERTS
ANGIOTENSINOGEN (FROM LIVER) TO ANGIOTENSIN I
WHERE IS ANGI I CONVERTED TO ANGI II AND BY WHAT
IN LUNGS BY ANGIOTENSIN-CONVERTING ENZYME (ACE)
ANGIOTENSINOGEN IS FROM
LIVER
ANGIOTENSIN II IS A
VASOCONSTRICTOR
ANGIOTENSIN II (VASOCONSTRICTOR)
ACTIVATES
ADRENAL CORTEX
ANGIOTENSIN II (VASOCONSTRICTOR)
ACTIVATES ADRENAL CORTEX TO RELEASE WHAT
ALDOSTERONE
ALDOSTERONE INCREASES
SODIUM AND WATER REABSORPTION AND POTASSIUM SECRETION BY KIDNEYS
RAAS
RENIN-ANGIOTENSIN- ALDOSTERONE SYSTEM
WHEN DECREASED CIRCULATION / DECREASED BP IS SENSED BY KIDNEYS WHAT HAPPENS
KIDNEYS SECRETES RENIN
WHEN KIDNEYS SECRETE RENIN, IT STIMULATES
THE LIVER
ANGIOTENSIN II STIMULATES WHICH GLAND
OUTER COTEX OF ADRENAL GLAND
WHAT DOES OUTER CORTEX OF ADRENAL GLAND RELEASE
ALDOSTERONE
WHAT EFFECT DIOES ALDOSTERONE HAVE ON THE BODY
INCREASES SODIUM & WATER REABSORPTION INTO BLOODSTREAM
CAUSES POTASSIUM SECRETION INTO URINE
WHAT IS THE RAAS NET EFFECT
INCREASED BLOOD VOLUME & INCREASED BP
ANGIOTENSIN STIMULATES OUTER CORTEX OF ADRENAL GLAND BUT ALSO STIMULATES
PERIPHERAL ARTERIAL VASOCONSTRICTION WHICH THEN RAISES BP
NATRIURESIS
EXCRETION OF LARGE AMOUNTS OF SODIUM AND WATER
THREE PEPTIDES PROMOTE NATRIURESIS
- ATRIAL NATRIURETIC PEPTIDE (ANP)
- BRAIN NATRIURETIC PEPTIDE (BNP)
- C-TYPE NATRIURETIC PEPTIDE (CNP)
ATRIAL NATRIURETIC PEPTIDE (ANP)
- ATRIAL CELLS WHEN ATRIA STRETCHED
RAIN NATRIURETIC PEPTIDE (BNP)
- HEART VENTRICLES AND TO LESSER EXTENT, THE BRAIN
C-TYPE NATRIURETIC PEPTIDE (CNP)
- ENDOTHELIAL CELLS OF ARTERIES AND
VENTRICULAR CELLS
ASSESSMENT OF FLUID STATUS
- DAILY WEIGHT
- 24-HOUR I & O (INPUT AND OUTPUT)
- VITAL SIGNS SUCH AS HEART RATE AND BLOOD PRESSURE
- ORTHOSTATIC HYPOTENSION MAY DEVELOP IN DEHYDRATION
- ASSESS STATUS OF MUCOUS MEMBRANES, SKIN TURGOR, URINE OUTPUT, EDEMA
1 OUNCE OF FLUID EQUALS
30 mL
- 24-HOUR I & O (INPUT AND OUTPUT)
- RECORD IN
mL
ORTHOSTATIC HYPOTENSION MAY DEVELOP IN
DEHYDRATION
ADD UP THE FOLLOWING INTAKE IN MILLILITERS
* 8 OZ COFFEE
* 6 OZ JUICE
* 1⁄2 CUP JELLO
540 mL
TO MAINTAIN, THE GAINS & LOSSES MUST
EQUAL
SEQUESTERED FLUIDS
FLUID ACCUMULATES IN BODY CAVITIES NORMALLY FREE OF FLUIDS
SEQUESTERED FLUIDS
* FLUID ACCUMULATES IN BODY CAVITIES NORMALLY FREE OF FLUIDS
* AKA:
THIRD-SPACE ACCUMULATION OR
THIRD-SPACING PERICARDIAL SAC,
PERITONEAL CAVITY, AND
PLEURAL SPACE
SEQUESTERED FLUIDS ALSO CALLED
FLUID CALLED “EFFUSION” doublecheck
FLUID CALLED “EFFUSION” (2) TYPES
- TRANSUDATE: SEROUS FILTRATE OF BLOOD
- EXUDATE: CONTAINS BLOOD, LYMPH, PROTEINS, PATHOGENS, INFLAMMATORY CELLS
Transudative pleural effusion is caused by
fluid leaking into the pleural space. This is from increased pressure in the blood vessels or a low blood protein count. Heart failure is the most common cause
Transudative pleural effusion is caused by fluid leaking into the pleural space. This is from
increased pressure in the blood vessels or a low blood protein count. Heart failure is the most common cause
 Exudative effusion is caused by
blocked blood vessels or lymph vessels, inflammation, infection, lung injury, or tumors
MAINTAINING THE FLUID BALANCE IN THE BODY IS A BALANCING ACT. WHICH ORGANS ALL WORK o TOGETHER TO MAINTAIN FLUID BALANCE.
HEART, KIDNEYS LIVER, ADRENAL AND PITUITARY GLANDS
YOU GAIN AND LOSE ON A
DAILY BASIS
THIS DELICATE FLUID BALANCING ACT IS AFFECTED BY
- FLUID VOLUME
- DISTRIBUTION OF THE FLUIDS IN THE BODY
- CONCENTRATION OF SOLUTES IN THE FLUID
HOW MUCH WATER IS GAINED ON AVG EACH DAY THROUGH FOOD & DRINK
2.2 L
HOW MUCH WATER IS GAINED ON AVG EACH DAY THROUGH METABOLISM
0.3 L
TOTAL DAILY INTAKE H2O iS APPROX
2.5 L / DAY
(4) WAYS H2O IS LOST
SKIN / LUNGS / URINE / FECES
HOW MUCH WATER IS LOST THROUGH SKIN & LUNGS / DAY
0.9 L / DAY
WATER LOST EACH DAY THROUGH SKIN & LUNGS IS WHAT TYPE OF LOSS
INSENSIBLE LOSSES