Pediatric renal replacement therapy in the icu
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Transcript of Pediatric renal replacement therapy in the icu
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Pediatric Renal Replacement Therapy In The ICU
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Introduction
• Pediatric RRT – growing role in PICU
• Volume overload and metabolic imbalance complicate course of critically ill patients
• Improving techniques coupled with the realization that early supportive therapy may improve outcomes have combined use of RRT for critically ill patients
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Indications For Renal Support
• Acute renal failure
• Acute intoxication and metabolic disorders
• Renal Support - MODS
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Conservative Management
• Optimization of clinical status• Maintenance of fluid balance , renal
perfusion, cardiac output , adequate blood pressure
• Judicious use of diuretics• Fluid restriction• Careful dietary management• However early initiation of RRT improves
mortality and morbidity
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Basic Physiology of Dialysis And Ultrafiltration
• Molecular movement across semipermeable membrane
• Basic mechanisms of water and particle removal include
• Diffusion
• Convection
• Ultrafiltration
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• Diffusion
• Movement of dissolved particles across semi- permeable membrane from area of high concentration to area of low concentration
• Favors movement of smaller particles
• Stops when concentration gradient achieves equilibrium
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• Convection
• Dissolved particles pass across semi permeable membrane due to effects of pressure gradient
• Ultrafiltration
• Describes movement of water across semipermeable due to pressure
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3 modalities
• Peritoneal dialysis
• Intermittent Hemodialysis
• Continuous Renal Replacement Therapy
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PERITONEAL DIALYSIS• Physiology • Peritoneum can be used as a dialysing
membrane• Instillation of a dialysate into the peritoneal
space permits diffusion of particles out of the blood across the peritoneum
• Through the use of a hypertonic solution , water also passes across the membrane generating an ultrafiltrate
• Water movement tends to drag particles across the peritoneum by convection
• After the dwell is complete , the spent dialysate is drained from the abdomen and fresh dialysate may be introduced
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Indications
• Remove excess fluid and provide volume control in the patient with oligoanuria
• Much slower than intermittent hemodialysis
• Preferable in the critically ill patient
• Provides metabolic control
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Technique
• Instill sterile dialysate into peritoneal cavity• Allow it to dwell • End of dwell time the dialysate is removed• Dialysate contains base in the form of lactate• Ultrafiltration accomplished by osmotic
pressure thro dextrose• Should be warmed to body temp • Start with 10 – 20 ml/kg ( 500 ml/m2)• Can increase upto 1100ml/m2• Dwell period of 30 - 60 min
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Disadv
• Placement of an intra-abd catheter • Patients who undergone intra – abd
surgery are poor candidates for PD• Peritonitis• Perforation of abdomen or pelvic
structures• Kinking , fibrin plugs , omental obstruction• Hemodialysis prefered where rapid
removal of toxins are reqd
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Issues
• Loss of protein – supplement it
• Hyperglycemia
• GER – stomach comp
• Critically ill – inc intra abd pressure leading to dec Venous return and dec diaphragm excursion
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Intermittent Hemodialysis
• Rapid metabolic correction and fluid removal
• Technically difficult in small children and infant
• Therapy of choice for some critically ill pediatric patients
• Requires expereinced personnel
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PHYSIOLOGY
• Dialyser – semi permeable memb• Hollow fiber dialyser with microscopic fenestration• Vary in surface area , permeability , priming volume and
memb composition• Requires high blood flow , hence a high quality vascular
access• Ultrafilt occurs because of hydrostatic pressure across
memb• Increasing blood flow , dialysate flow or dialyser size will
inc rate of diffusion• Ultrafilt occurs because of hydrostatic pressure across
the membrane• Removes only the intravascular volume
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Indications
• Best method for removal of toxic ingestion , drug overdoses , metabolic derangements
• Hyperkalemia
• Tumor lysis syndrome
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Technique
• Vascular access – 1st step• Most patients require heparin for anticoagulation• Some patients require little or no heparin• Monitor clotting time to determine the need for
heparin ( ACT -120 – 180 )• Blood pump rate chosen based on quality of
vascular access and clinical status of the patient• Chosen dialyser should permit sufficient
clearance to achieve the goals of dialysis AN69
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Disavantages and complic
• Vascular access – infection , bleeding , thrombosis
• Critically ill patients donot tolerate rapid clearing
• Unstable patients require priming of extra corporeal volume
• Complications of heparin
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ISSUES
• Special attention to fluid and electrolyte balance
• One should limit potassium and phosphorus delivery
• Medication doses and schedule may require adjustment
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Continuous Renal Replacement Therapy
• Broad name applied to several techniques of extracorporeal support
• More popular in pediatric patients
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Physiology
• Membranes made from polysulfone or polyacrylonitrile
• More porous to permit greater removal of water
• Both convection and diffusion can be used to remove particles during CRRT
• Clearance is slower than IHD
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Types of CRRT
• Continuous veno – venous hemofiltration – high convective clearance
• Continuous veno – venous hemodialysis
Uses dialysate
• Continuous veno – venous hemodiafiltration
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Indications
• Slow , continuous removal of fluid
• Maintains cardiovascular stability
• Useful in critically ill patients
• Maintains metabolic balance
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Technique
• Large vascular access
• Anticoagulation
• Dialysate
• Clearance
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Disavantages
• Vascular access
• Heparin
• Citrate
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Issues
• Can cause profound electrolyte dist
• Increased nitrogen losses
• Increased nutritional support
• Medication adjustment
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Thank You