Urinary Elimination, Fluid Balance & Intake and Output Flashcards
How is balanced maintained?
ingestion, distribution and excretion of water and electrolytes
What system is fluid balanced primarily maintained by?
renal
How much does our intracellular fluid make up?
60%
Interstitial
fluid between cells in the tissue
Intravascular
blood and plasma
transcellular
fluid separated by epithelium (pleural, peritoneal)
Osmosis
movement of water through a semipermeable membrane from an area of lesser solute concentration to one of greater concentration
osmotic pressure
pressure needed to counter the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high concentration
what does decrease in albumin result in?
decrease osmotic pressure
Active trasnport
movement of molecules across a concentration gradient using chemical energy
Where does diffusion happen?
diffusion of oxygen and carbon dioxide between alveoli and lung blood vessels
filtration
uses hydrostatic pressure gradient and results in 2-4L of fluid per day entering the interstitial fluid from intravascular space
What organs does output occur?
kidneys, skin, lungs and GI tract
What is the obligatory water loss per day?
500 mL minimum
Sensible water loss
urine and feces; see and measure
insensible water loss
skin and respiratory system; cant really measure
How much will the kidneys filter out per day?
filters 180L of plasma daily and creates 1.2-1.5L of urine each day
How much do the small intestines manage?
9L of fluid which gets secreted into the GI tract daily and most gets reabsorbed and 100mL is lost in feces daily
What is the fluid intake regulation?
thirst mechanism
Hormonal control of fluid intake?
ADH or aldosterone
ADH release
to increase serum osmolality and act on renal tubules and collecting ducts and make them more permeable to water which increases the amount of water reabsorbed into the blood circulation and decrease amount of water thats lost through urine
Aldosterone release
by adrenal cortex in response to high potassium levels and low sodium levels; counteract hypoyvelemia results, in increased absorption of sodium in distal renal tubules
When are osmoreceptors in the hypothalamus stimulated?
when serum osmolality increases or blood volume decreases
Intake Measures
oral- 1100-1400
Food- 800-1000mL
Metabolism- 300mL
Output measures
Skin (insensible)- 500-600mL
Lungs(insensible)- 400mL
Gi- 100-200mL
Urine- 1200-1500mL
Volume imbalances
disturbances in amount of ECF
Fluid volume deficit (nursing diagnosis)
dehydration, vomitting, decreased oral intake, extreme heat, diarrhea
Fluid volume excess (nursing diagnosis)
heart failure, kidney disease, IV therapy: body cannot regulate the fluid volume
aspects of fluid balance chart
- all intake and output over a 24hr period and 24hr fluid balance (excess or deficit)
- intake: oral fluids, IV, feeding tube
- output: urine, NG drainage, wound drainage, loose stool, vomitus, other drainage tubes
- need to look at trends over time (2-3 days before)
- daily input-output should be about 500mL
Daily weight
- consistent time, scale, same clothing
- A CHANGE OF MORE THAN 1KG PER DAY IS SIGNIFICANT
Cardiovascular
- blood pressure, pulse rate, and quality, capillary refill, edema
- if dehydrated increase pulse rate or tachycardia (shows increased demands)
Respiratory
- presence of crackles on auscultation
- too much fluid can end up in the pulmonary vasculature and cause crackles
Renal
urine output decrease amount (dark yellow colour)
integumentary
mucous membranes, skin turgor
Positive fluid balance
- assess patient for signs of fluid overload
- look at trends over time
- consider patient context and condition
Negative fluid balance
- assess patient for dehydration
- look at trends
- consider patient context and condition
Urinary Elimination (Micturition)
urination or voiding: complex neural response that allows bladder to contract, the urethral sphincter to relax and urine to leave the body through the urethra
Urinary Elimination (Upper tract)
Kidneys- remove waste from blood to urine and normally protein and RBC do not filter through glomerulus
Ureters- transport urine from kidneys to the bladder
Urinary Elimination (Lower tract)
Bladder- reservoir for urine until the urge to urinate develops
Urethra- passage through which urine travels from the bladder ending at the urethral meatus through the urine exits; transverse pelvic floor muscles
How big is the urethra in females?
3-4cm
How big is the urethra in males?
18-20 cm
Act of urination
sensory nerves from the bladder carry signals to the brainstem when the bladder is full
When is the urge to void first felt?
when the bladder is 250-300mL full
When is a strong urge to void felt?
500mL capacity
Factors influencing urination
- psychological factors: anxiety and stress
- Socioculture factors: culture, gender & religion
- Fluid balance: caffeine, alcohol
- Diagnostic examination
- Surgical procedures: anaesthesia
- Pathological conditions: neurological disease, altered mobility, renal disease
- Medication: diuretics
What do UTI’s commonly result from?
catheterization: some other causes such as dysuria, hematuria, fever, malaise, cloudy urine can lead to bacteremia and urosepsis
Urinary incontinence
involuntary leakage of urine: increased risk of skin breakdown
Nocturia
waking at the night to urinate
Urinary retention
accumulation of urine caused by the inability of the bladder to empty (underactive detrusor muscle, urethral obstruction, after surgery, medication, side effect, fecal impaction, prostate enlargement, altered bladder innervation)
Urinary diversions
diversion of urine to external source
Factors impacting urination
infection control and hygiene (urinary tract is considered sterile, asepsis to prevent infection with invasive procedures, catheterization and other procedures sterile technique)
Psychosocial and cultural considerations (may also alter sexuality and self concept, need for comfort and privacy, gender)
Growth and development
- infants and young children cannot concentrate urine effectively
- increase frequency with pregnancy
- changes with menopause
- prostate enlargement in older men
- older adults: reduced GFR, nocturia, decreased bladder contraction can lead to residual post void volume
When does toilet training become full of ones control?
4-5 years of age
How much should adults urinate daily?
1500-1600 mL of urine; approx every 4-5 hours
Assessing urinary
- Pattern of urination
- symptoms of urinary alterations ( incontinence, urgency, frequency, hesitanccy, dribbling, dysuria, polyuria, oliguria, nocturia, hematuria)
- elevated post void residual volume: incomplete bladder emptying
Factors affecting urination
- medical and surgery history
- bowel elimination pattern
- mobility
- impact on quality of life
PA: Skin and mucosal membranes
oral mucos and skin turgor
PA: Kidneys
flank pink, renal artery bruit
PA: Bladder
full bladder palpable between symphysis pubis and umbilicus (dull to percussion on full bladder)
PA: Female perineum
skin integrity, rash, inflammation, discharge
PA: Male perineum
urethral meatus
T/F: change in urine volume is a signifiant indicator of fluid alterations or kidney disease?
true
Amount
measured with urine hate (goes under seat) (no sharing)
Urinal
pour urine from urinal into clear container with measurements
Checking urine output
bedpan, catheter collection bag, weight diapers or briefs (1gram of liquid in diaper ways 1mL; know the size of dry diaper)
When is output a cause for concern?
less than 30mL for 2hrs
Peds: up to age 2 should produce
2mL/kg/hour
Peds: ages 2 and up should produce
1mL/kg/hour
Characteristics of urine
colour, clarity, odour
Formula for calculation
how much urine is produce, divided by kg of weight divide by hours measuring for
Urine testing
- Random specimen, clean voided, catheter specimen, timed urine collection in children
- Urinalysis (dip sticks)- protein, gluoce, ketones, blood, WBC, bacteria, casts
- Specific gravity: concentration of urine particles, osmolality even more accurate
- Urine culture
Examples of urine diagnosis
- disturbed body image
- pain (acute or chronic)
- self care deficit, toileting
- impaired skin integrity
- impaired urinary elimination
- urinary incontinence
- urinary retention
Promoting regular micturition
- voiding every 3/4 hrs
- avoid constipation and promote regular bowel habits
- assist patient to a normal position for voiding
- promote privacy and relaxation
- maintain adequate fluid intake- concentrated urine irritates bladder
- promote complete bladder emptying
- prevent infection ( good perineal hygiene, cleansing meatus)
- Catheters and incontinence products (requires prescribers order)
Incontinence alone is not a reason to insert urinary catheter
TRUE