Module 14: Care of a Patient Requiring Dialysis Flashcards
renal system
- entire blood volume filtered through the kidneys every 4-5 minutes
- normal renal blood flow is 1200 ml/minute
kidney failure
- acute kidney injury (AKI)
- rapid onset (1-7 days)
- may be reversible
- high mortality rate (35-65%)
Chronic Kidney disease (CKD)
- progressive loss of kidney function resulting in decline in glomerular filtration rate
- may be swagged according to glomerular filtration rate
- signs and symptoms minimal until more than 75% of glomerular filtration lost
- risk factors: diabetes. hypertension, smoking
Monitoring Kidney Function
- glomerular Filtration Rate (GFR) *
- urine output and urinalysis
- Serum creatinine *
- creatinine clearance
- BUN *
- electrolyte
- arterial blood gases
- hemoglobin
GFR (glomerular filtration rate)
- normal adult value: 90-120 ml
- used to detect and screen for early kidney damage and monitor kidney status
- determines how well blood is filtered by the kidneys
- calculated using a formula
- used as indicator for the need of hemodialysis or peritoneal dialysis
Creatinine
- normal adult value: 45 - 110 umol/L
- is part of complete renal function panel which assists in the diagnosis of kidney function
- is excreted entirely by the kidneys, therefore is directly proportional to kidney excretory function
- elevated in renal disorders
blood urea nitrogen
- normal adult value: 2-9 mmil/L
- rough estimate of kidney function and GFR in patient’s with normal liver function
- most kidney diseases cause an inadequate excretion of urea which causes rise in blood concentration
Explain the reasons why a patient would require dialysis
- used to sustain life after kidneys fail
- for acute renal failure - temporary
- for chronic kidney failure - until the patient can obtain a kidney transplant
Goals of dialysis
- remove the end products of protein metabolism from the blood
- maintain safe concentrations of serum electrolytes
- correct acidosis and replenish the body bicarbonate buffer system
- remove excess fluid from the blood
principles of dialysis
- movement of fluid and particles through a semipermeable membrane
- patients blood, including metabolic waste, excess water and electrolytes are on one side of the membrane
Peritoneal dialysis
membrane lining the abdomen acts as filter
- lining covering the abdominal organs
- parietal layer and visceral layer
- 1-2 square meters in size
advantages of peritoneal dialysis
- continuous treatment
- patient feels better
- less restrictive diet
- better blood glucose control
- better bp control
- less interference with ADL
- no needle s
- no anticoagulation
- less anemia
disadvantage of peritoneal dialysis
- change in body image
- risk of peritonitis
- no “days off”
- no tub baths
- no swimming
- backpain
- large amount of storage in the home
- increased loss of protein
Catheter types
- percutaneous - through abdominal wall (tenckhoff)
- implanted
Patient’s peritoneum is used as a semi permeable membrane - 3 phases
- inflow - about 2L of fluid infused
- dwell - several hours, depends on order
- drain -20-30 minutes
Contraindications to Peritoneal Dialysis
- open abdominal wound
- recent abdominal surgery/ trauma
- patient opening between peritoneum and pleural cavity
- inadequate surface area due to scarring
Complications of Peritoneal Dialysis
- Peritonitis: infection or inflammation of peritoneal cavity:
- cloudy effluent
- abdominal pain
- fever/chills
- nausea/vomiting
Peritoneal Dialysis May be Preferred for:
- patients who lives in rural area
- severe heart disease
- patient preference - able to administer at home according to prescribed cycles
- poor vasculature
- for some diabetic patients
Continuous Ambulatory Peritoneal Dialysis (CAPD)
- the dialysate solution stays in the abdomen for about 4-6 hours
- exchanges are done about 4 times a day
- the most commonly used form of peritoneal dialysis
- highest risk of peritonitis
Continuous Cycling peritoneal Dialysis (CCPD)
- a machine automatically fills and drains the dialysate from the abdomen
Hemodialysis
blood filter through dialysis machine “artificial kidney”
- filters out waste products, excess fluid, balances electrolytes
- intermittent (IHD)
- continuous (CRRT)
- Treatment takes 4-5 hours 3X week
- clinic, home dialysis
- nocturnal dialysis 6-8 hours, 6 nights per week
hemodialysis advantages
- shorter time period per treatment
- quickly resolves acute problems
- patient not required to learn the procedure
hemodialysis disadvantages
- difficulty with hemodynamically unstable patient
- problems with vascular access
- specially trained operator required
- anti-coagualtion required
Vascular Access for Hemodialysis:
central venous catheter
- for temporary or long-term dialysis
- for patient waiting for permanent fistula or graft
- patient whose fistula or graft is not working
- for peritoneal dialysis patient who requires hemodialysis
- types
- direct percutaneous
- tunnelled
- implanted port
Vascular Access for Hemodialysis: Arteriovenous Fistula (AVF)
- surgical anastomosis of an artery to vein
- vein wall thickens and dilates
- requires 2-6 months to mature
- radial of brachial in non-dominant arm
- can last up to 20 years ( average 7-9 years)