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Dialysis

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Dialysis

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Dialysis

  1. 1. DIALYSIS Dr. Frank Edwin
  2. 2. CAUSES OF RENAL FAILURE  􀂃 Diabetes  􀂃 Untreated high blood pressure  􀂃 Inflammation  􀂃 Heredity  􀂃 Chronic infection  􀂃 Obstruction  􀂃 Accidents
  3. 3. 1.Renal Failure Diagnosis Symptoms: Anorexia, Nausea, Vomiting, Oliguria • ? Precipitating factors Signs: Anaemia, Hypertension, Fluid Overload etc Biochemistry: – Blood • Urea >7mmol/l • Creatinine >120umol/l • Electrolytes: Rising K+ – Creatinine Clearance (GFR <<120ml/l) – Urine: Proteinuria May be Acute or Chronic Acute – Reversible or Irreversible
  4. 4. 2. Treatment Options No Treatment Monitoring & Predialysis – Control symptoms – Preserve Residual Renal Function • Control rising BP (Antihypertensives) • Control Renal Bone Disease (Ca2+ , Vit D) • Prevent/Treat Anaemias (Erythropoietin, Blood) Dialysis Renal Transplantation
  5. 5. Dialysis Definition Artificial process that partially replaces renal function Removes waste products from blood by diffusion (toxin clearance) Removes excess water by ultrafiltration (maintenance of fluid balance) Wastes and water pass into a special liquid – dialysis fluid or dialysate
  6. 6. Types Haemodialysis (HD) Peritoneal Dialysis (PD) They work on similar principles: Movement of solute or water across a semipermeable membrane (dialysis membrane)
  7. 7. Diffusion Movement of solute Across semipermeable membrane From region of high concentration to one of low concentration
  8. 8. Ultrafiltration Made possible by osmosis Movement of water Across semipermeable membrane From low osmolality to high osmolality Osmolality – number of osmotically active particles in a unit (litre) of solvent
  9. 9. Selection for HD/PD Clinical condition Lifestyle Patient competence/hygiene (PD - high risk of infection) Affordability / Availability
  10. 10. 1. 2. Blood cells are too big to pass through the dialysis membrane, but body wastes begin to diffuse (pass) into the dialysis solution. 3. Diffusion is complete. Body wastes have diffused through the membrane, and now there are equal amounts of waste in both the blood and the dialysis solution.
  11. 11. The process of ultrafiltration in PD 11. 2 2. Blood cells are too big to pass through the semi-permeable membrane, but water in the blood is drawn into the dialysis fluid by the glucose. 3. Ultrafiltration is complete. Water has been drawn through the peritoneum by the glucose in the dialysis fluid by the glucose in the dialysis fluid. There is now extra water in the dialysis
  12. 12. Haemodialysis Dialysis process occurs outside the body in a machine The dialysis membrane is an artificial one: Dialyser The dialyser removes the excess fluid and wastes from the blood and returns the filtered blood to the body Haemodialysis needs to be performed three times a week Each session lasts 3-6 hrs
  13. 13. Requirements for HD Good access to patients circulation Good cardiovascular status (dramatic changes in BP may occur)
  14. 14. Performing HD HD may be carried out: In a HD Unit At a Minimal Care / Self-Care Centre At Home
  15. 15. HD Unit Specially designed Renal Unit within a hospital Patients must travel to the Unit 3x a week Patients are unable to move around while on dialysis; may chat, read, watch TV or eat Nursing staff prepare equipment, insert the needles and supervise the sessions
  16. 16. Minimal / Self-Care Dialysis Patients take a more active role Patients prepare the dialysis machine, insert the needles, adjust pump speeds and machine settings and chart their progress under the supervision of dialysis staff Patients must travel to the unit 3x / week Patients need to be on a fixed schedule
  17. 17. Home Haemodialysis Use of machines set up at home Machines have many safety devices inbuilt Thorough patient training Requires the help of a partner at home every time Suitability is assessed by the haemodialysis team Ideal for patients who value their independence and need to fit in their treatment around a busy schedule
  18. 18. HD Access 2 types of access for HD: – Must provide good flow – Reliable access A fistula: arterio-venous (AV) Vascular Access Catheter
  19. 19. AV Fistula
  20. 20. AV Fistula
  21. 21. Vascular Access Catheter
  22. 22. AV Fistula Access Matures in about 6 weeks Ensure good working order – Avoid tight clothing or wrist watch on fistula arm – Assess fistula daily; notify immediately if not working – Avoid BP cuff on fistula arm – Avoid blood sampling on fistula arm (except daily HD Rx) – Avoid sleeping on fistula arm – Grafts (synthetic) may be used to create an AV fistula
  23. 23. Vascular Access Catheter Double lumen plastic tube May be placed in Jugular, Subclavian or Femoral vein May be temporary or permanent Temporary – awaiting fistula or maturation Permanent – poor vessels for fistula creation e.g. children and diabetics Catheters must be kept clean, dry and dressed to prevent infection
  24. 24. Effects of HD on Lifestyle  Flexibility: – Difficult to fit in with school, work esp if unit is far from home. Home HD offers more flexibility  Travel: – Necessity to book in advance with HD unit of places of travel  Responsibility & Independence: – Home HD allows the greatest degree of independence  Sexual Activity: – Anxiety of living with renal failure affects relationship with partner  Sport & Exercise: – Can exercise and participate in most sports  Body Image: – Esp with fistula; patient can be very self conscious about it
  25. 25. Problems with HD  Rapid changes in BP – fainting, vomiting, cramps, chest pain, irritability, fatigue, temporary loss of vision  Fluid overload – esp in between sessions  Fluid restrictions – more stringent with HD than PD  Hyperkalaemia – esp in between sessions  Loss of independence  Problems with access – poor quality, blockage etc. Infection (vascular access catheters)  Pain with needles  Bleeding – from the fistula during or after dialysis  Infections – during sessions; exit site infections; blood-borne viruses e.g. Hepatitis, HIV
  26. 26. Peritoneal Dialysis (PD) Uses natural membrane (peritoneum) for dialysis Access is by PD catheter, a soft plastic tube Catheter and dialysis fluid may be hidden under clothing Suitability – Excludes patients with prior peritoneal scarring e.g. peritonitis, laparotomy – Excludes patients unable to care for self
  27. 27. Addendum to Principles (PD) Fluid across the membrane faster than solutes; therefore longer dwell times are needed for solute transfer Protein loss in PD fluid is significant ~ 8-9g/day Protein loss ↑s during peritonitis PD patients require adequate daily protein averaging 1.2 – 1.5g/kg/day Other substances lost in the dialysate – Amino acids, water soluble vitamins, some medications and hormones Calcium and dextrose are absorbed from the dialysate fluid into the circulation
  28. 28. Addendum to Principles (PD) Standard dialysis solution contains: • Na+ – 132 mEq/l • Cl- – 96 -102 mEq/l • Ca2+ – 2.5 – 3.5 mEq/l • Mg2+ – 0.5 -1.5 mEq/l Dialysis solution buffer: – Sodium lactate – Pure HCo3 - – HCo3 - /Lactate combinations Lactate is absorbed and converted to HCo3 - by the liver Dextrose solution strengths: 1.5%, 2.5%, 4.25%
  29. 29. Types Continuous Ambulatory Peritoneal Dialysis (CAPD) Automated peritoneal Dialysis (APD)
  30. 30. CAPD Dialysis takes place 24hrs a day, 7 days a week Patient is not attached to a machine for treatment Exchanges are usually carried out by patient after training by a CAPD nurse Most patients need 3-5 exchanges a day i.e. – 4-6 hour intervals (Dwell time) 30 mins per exchange May use 2-3 litres of fluid in abdomen No needles are used Less dietary and fluid restriction
  31. 31. CAPD Exchange
  32. 32. APD Uses a home based machine to perform exchanges Overnight treatment whilst patient sleeps The APD machine controls the timing of exchanges, drains the used solution and fills the peritoneal cavity with new solution Simple procedure for the patient to perform Requires about 8-10 hrs Machines are portable, with in-built safety features and requires electricity to operate
  33. 33. PD Access  Done under  LA or GA
  34. 34. DIET Why is diet important? – Managing the diet can slow renal disease – The need for dialysis can be delayed – The diet affects how patients feel
  35. 35. CONTROLLING YOUR DIET Foods to control are those containing:  Protein  Potassium  Sodium  Phosphorous  Fluid
  36. 36. PROTEINS Animal protein Dairy (milk, cheese) Meat (steak, pork) Poultry (chicken, turkey) Eggs Plant protein Vegetables Breads Cereals
  37. 37. MAJOR SOURCES OF POTASSIUM Milk Potatoes Bananas Oranges Dried Fruit Legumes Nuts Salt substitute Chocolate
  38. 38. SODIUM Regulates blood volume and pressure Avoid salt Use Alternate food seasonings: lemon and limes, spices, seafood seasoning, Italian seasoning, vinegars, peppers
  39. 39. FLUIDS Healthy kidneys remove fluids as urine Check for fluid and sodium retention Need to restrict fluid intake
  40. 40. PHOSPHOROUS Phosphorus is a mineral which combines with calcium to keep bones and teeth strong Too little calcium and too much phosphorus Need to control the phosphorus in the diet Need to take a phosphate binder or a calcium supplement
  41. 41. VITAMINS Folic acid Iron supplements Do not take OTC’s without consulting the doctor.
  42. 42. MANAGING YOUR DIET INDICATORS OF GOOD CONTROL:  Weight loss or gain Blood pressure Swelling of hands and feet Blood samples
  43. 43. LAB MONITORING  Haemoglobin  Albumin  Calcium  Phosphorus  GFR  (24 hour urine)  Sodium  Potassium  Urea  Creatinine
  44. 44. Lifestyle Changes with PD Flexibility – Can be performed almost anywhere – Least impact on work / school life (esp APD) Travel – Dialysis supplies can be delivered to most parts of the world; travel more flexible. APD machines are portable; will fit into a car boot, can be carried by train/air Responsibility – Requires more responsibility from patient but more independence
  45. 45. Lifestyle Changes with PD Sports/Exercise – Most are possible – Advice on swimming, lifting, contact sports Sexual Activity – May affect relations based on patient anxiety Delivery & Storage of Supplies – Home delivery and storage – A month’s supplies – 40 boxes; space to store – Specially recruited and trained delivery staff
  46. 46. Problems with Treatment Monotomy of treatment – The treatment never goes away against days off with HD Body Image Problems – Esp with a permanent catheter – Abdominal stretching Fluid Overload – Much less a problem than with HD Dehydration – Less common than fluid overload Abdominal Discomfort – Bloated feeling
  47. 47. Problems with Treatment Poor drainage – Common problem esp with new patients – Fibrin plug – Catheter displacement Leakage – Fluid may leak around catheter exit site. (May leak into scrotum) – Stop PD temporarily – Resite catheter (use new one) Infections – Exit site infections – Tunnel infection – peritonitis
  48. 48. Problems with Treatment Hernia – Aggravation of pre-existing herniae (repair) – Evolution of new herniae Declining effectiveness of the peritoneum – e.g. repeated infection – Effect of glucose in the dialysis fluid
  49. 49. Comparison of Dialysis Treatment Options PD Unit HD Home HD Home Dialysis √ × √ Convenient Sessions √ × √ Socializn with other CRF pats × √ × Home Equipment/Supplies √ × √ Special diet/fluid allowance √ √ √ Sports/exercises participation Most Most Most Full day activity -work/school √ Not alwys √ Direct assist–partner/family × × √ Travel √ Delivery of supplies to most destins easy. Some notice req √ Prior arrangements must be made well in advance × Prior arrangements must be made well in advance

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