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C ontinuous R enal R eplacement T herapy

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C ontinuous R enal R eplacement T herapy. Why continuous Therapies?. Continuous therapies closely mimic the GFR of native kidneys. Large amounts of fluid and waste products removed over time. Tolerated well by hemodynamically unstable patients.

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Presentation Transcript
slide1

Continuous Renal

Replacement Therapy

slide3

Why continuous Therapies?

Continuous therapies closely mimic

the GFR of native kidneys

Large amounts of fluid and waste

products removed over time

Tolerated well by hemodynamically

unstable patients.

slide4

Hemodialysis is for non-functioning kidneys

in patients with fairly good health

CRRT is for saving kidney function in

patients with very poor health

slide5

CRRT Treatment Goals

  • Maintain fluid, electrolyte & acid/base balances
  • Prevent further damage to kidney tissue
  • Promote healing and total renal recovery
  • Allow other supportive measures; nutritional support
slide7

Access

  • Internal Jugular Vein –
  • Lower risk of complication
  • Simplicity of catheter insertion
  • Subclavian Vein –
  • Higher risk of pneumo/hemothorax
  • Associated with central venous stenosis
  • Femoral Vein –
  • Optimal site for immobilized patient
  • Easiest site for infection
  • Increased chance for infection
scuf slow continuous ultrafiltration
SCUFSlow Continuous UltraFiltration

Return

Access

Blood Pump

Effluent

Pump

PBP

Pump

Effluent

Infusion or Anticoagulant

cvvh continuous vv hemofiltration
CVVHContinuous VV Hemofiltration

Return

Access

Blood Pump

Replacement

Pump 2

Effluent

Pump

Replacement

Pump 1

PBP

Pump

Effluent

Replacement 2

Replacement 1

Infusion or Anticoagulant

cvvhd continuous vv hemodialysis
CVVHDContinuous VV HemoDialysis

Return

Access

Hemofilter

Blood Pump

Effluent

Pump

PBP

Pump

Dialysate

Pump

Infusion or Anticoagulant

Dialysate

Fluid

Effluent

cvvhdf continuous vv hemodiafiltration
CVVHDFContinuous VV HemoDiaFiltration

Return

Access

Blood Pump

Dialysate

Pump

Effluent

Pump

Replacement

Pump

PBP

Pump

Dialysate

Fluid

Effluent

Infusion or Anticoagulant

Replacement

Fluid

slide14

Filter clotting is the Achilles\' heel of CRRT and causes hours of lost therapy. Heparin is often used and is effective but is not always feasible and requires monitoring of the ACT.Regional citrate anticoagulation minimizes the major complication of bleeding associated with heparin, but it requires monitoring of ionized calcium and calcium replacement.

Pre-filter replacement fluid tends to dilute the blood entering the circuit and enhances filter longevity but decreases the efficiency of the process because of less filtrate available

Filter

Clotting

slide15

Constant pressure across the membrane causes a layer of protein to form over the membrane reducing its efficacy. This process is termed concentration polarization. Inflammatory mediators in septic patients adhere to the filter membrane also and contribute to cloggingof the filter.

Filter

Clogging

slide16

Filter Pressure Drop

is the change of pressure from blood entering the filter to that leaving the filter. It is a calculated value used to determine pressure conditions inside the hollow fibers of the filter. It will slowly rise with filter use as the hollow fibers become filled with microscopic clots. The amount and rate of increase determines the activation of the “filter is clotting alarm”.

slide17

Trans Membrane Pressure (TMP) is the pressure exerted on the filter membrane during operation of the PRISMA System. It reflects the pressure difference between the fluid and blood compartments of the filter. The permeability of the membrane decreases due to protein coating on the blood side of the membrane and adsorption of certain solutes. These processes cause clogging of the filter which causes the TMP to rise. The amount of increase and the rate of TMP increase contribute to the “Filter is Clotting” alarm.

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