Hemodialysis

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Dialysis Main Page

Patient Information

Overview

Components

Dialyzer
Dialysate
Blood Delivery System

Vascular Access

Anticoagulation

Monitoring and Adequacy

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Joseph Nasr, M.D.[2] Seyedmahdi Pahlavani, M.D. [3]

Overview

The goal of hemodialysis is removing toxins and aim to maintain euvolemia. Ninety three percent of ESRD patients in the United States and 89% worldwide, are under hemodialysis.[1] Solute diffusion across a membrane is the basic principle for hemodialysis. Metabolic waste products move across a semipermeable membrane depending on their concentration gradient between plasma and dialysate. Concentration gradient, membrane surface area, the membrane thickness, and size of solute molecule are important factors determining rate of diffusion. Small molecules clear more efficiently than larger molecules. Fluid removal is another advantage of hemodialysis that could be achieved by ultrafiltration. In-center hemodialysis and home hemodialysis are available for ESRD patients requiring renal replacement therapy; the choice of modality is based on patient condition, patient preference, and the availability of equipments.

Components

The Dialyzer

Dialyzer is usually made of bundles of hollow fibers permitting a high flow rate of blood and dialysate simultaneously. Parallel plates are another type of dialyzer that are barely used in recent times. Most of the dialyzers are synthetic with a variety of materials including polyamide, polyarylethersulfone, polyvinylpyrrolidone, polyacrylonitrile, and polysulfone. Biocompatible membranes have the advantage of not activating complement system.

The Dialysate

The dialysate is a paramount composition in hemodialysis. Solutes diffuse across the dialyzer between blood and dialysate. The dialysate composition should be individualized to restore plasma normal values. The main solutes in dialysate include sodium, potassium, calcium, magnesium, chloride, bicarbonate , and glucose. These electrolytes are treated with water during the process. About 100 liters of water is needed for each dialysis session. The water used for hemodialysis should be processed in order to have a balanced concentration of solutes. Also, contaminants including bacteria, viruses, and heavy metals, such as aluminium should be removed from water. This removal could be done either by using reverse osmosis or deionization. Filters may be used to improve water quality by removing particles. The dialyzate temperature could also be adjusted to cause vasoconstriction and improve patient's hemodynamics.

The choice of the dialysate is important to maintain or correct the electrolytes.

  • Sodium: Usually, sodium concentration of 140-145 mEq/L is suitable for most of the patients but, it could be adjusted based on patient's sodium level.
  • Potassium: The potassium concentration in dialysate solution depends on patient potassium level. For example: For patients with hyperkalemia, a potassium concentration of 2-3 mEq/L is appropriate and for patients with hypokalemia, a potassium concentration of 4 mEq/L is appropriate.
  • Calcium: Dialysate concentration for calcium are available with 2.5 ,3, or 3.5 mEq/L. In most of the cases a 2.5 mEq/L solution which is equivalent to 5 mg/dl ionized calcium is used.

Blood Delivery System

The blood pump delivers blood from the arterial line to the dialyzer and then return it to the venous line. It's speed could be adjusted based on patient condition typically between 200 to 600 mL/min. This pump allows creating a transmembrane pressure in dialyzer by sucking dialysate. The dialysate flow rate is between 500 to 800 mL/min.

Vascular Access

  • The establishment and maintenance of reliable vascular access is crucial for long-term hemodialysis.
  • Creating arteriovenous (AV) access by establishing arteriovenous fistula (AVF) is the most reliable vascular access. On the other hand, arteriovenous graft (AVG) may provide access in certain circumstances by placing a prosthetic or biograft. However, majority of patients need temporary access by tunneled catheters for initiating hemodialysis.
  • Insertion of central catheter may cause complications, such as arterial and ventricular dysrhythmias, arterial puncture, hemothorax, pneumothorax, air embolism, perforation of central vein or cardiac chamber, and pericardial tamponade.
  • Infection is another concern regarding catheter care. Migration of bacteria from patient's skin is the mechanism of catheter infection. Skin preparation before procedure by using chlorhexidine at the catheter exit site could prevent catheter infection. Staphylococcus epidermidis, is the most common isolate. Prompt catheter removal is recommended if evidences of site infection is present even in the absence of systemic signs.
  • Catheter thrombosis may cause block blood flow is another aspect of catheter care. Instilling alteplase in the affected catheter lumen for 30 to 120 minutes is the preferred treatment.
  • Central vein stenosis: Subclavian vein catheters have a higher risk of stenosis. Using a dilator and ultrasound guided inserting may decrease the risk of vessel trauma and consequently minimize the likelihood of stenosis.

Vascular Access Complications (AV Fistula and AV Graft)

Arteriovenous access complications can occur immediately after access creation or develop months to years later due to altered hemodynamics and repeated cannulation. Contemporary practice emphasizes tailoring access choice and management to individual patient factors and preserving a functional access while minimizing morbidity.[2]

Epidemiology

Access related hand ischemia occurs in approximately 1 percent to 20 percent of patients after access creation, with 1 percent to 9 percent requiring surgical treatment.[3][4][5][6][7][8]

Pathophysiology

Mechanisms include arterial occlusive disease proximal or distal to the anastomosis, increased blood flow through the access, and inadequate adaptation of distal collateral networks.[3][4][8][9][10]

Risk factors

Peripheral vascular disease, diabetes, coronary artery disease, advanced age, female sex, brachial artery based inflow, multiple prior access procedures, and prior steal increase risk.[3][4][8][9][11]

Clinical features

Symptoms range from coolness and paresthesia to weakness, rest pain, ulceration, and tissue loss, and may worsen during dialysis. Improvement in perfusion findings with manual access compression supports the diagnosis.[6][10]

Diagnostic evaluation

Duplex ultrasonography assesses arterial stenosis or occlusion and may show retrograde flow from the distal artery into the access. Retrograde flow can occur in asymptomatic patients.[12]

Access flow assessment is helpful. High flow is typically greater than 800 mL per minute for autogenous access and greater than 1200 mL per minute for nonautogenous access.[12][13][14]

Digital pressures and digital brachial index can support the diagnosis. A basal digital pressure less than 80 mm Hg and a digital brachial index less than 0.6 to 0.7 have been associated with ischemia, although standardized thresholds are not established.[15][16]

Management

Mild symptoms may be monitored. Lifestyle limiting symptoms or tissue threatening ischemia warrant intervention.[2]

If arterial inflow obstruction is present, endovascular angioplasty with or without stenting is preferred.[2]

For high flow access related ischemia, flow reduction strategies include banding or plication. Precision banding and plication can relieve symptoms but overcorrection can lead to thrombosis and undercorrection can fail to resolve symptoms.[17][18][19]

For severe ischemia, access preserving reconstructive options include distal revascularization with interval ligation, revision using distal inflow, and proximalization of arterial inflow. Outcomes across series show high symptom resolution with variable 1 year patency depending on technique and conduit.[20][21]

For radial artery based forearm access, distal radial artery ligation may improve symptoms in selected patients with adequate ulnar and palmar arch perfusion.[22]

Access ligation is reserved for refractory ischemia, failure of reconstructive options, or limited life expectancy.[23]

Ischemic Monomelic Neuropathy

Ischemic monomelic neuropathy is rare but limb threatening and may occur within hours after access creation, typically with severe pain and global sensory and motor deficits despite preserved distal pulses and a warm hand. Diagnosis is frequently delayed because perfusion can appear normal. Immediate access ligation is recommended to prevent permanent sensorimotor loss affecting the median, ulnar, and radial nerves.[24][25]

Neuropathies in Hemodialysis Patients

Carpal tunnel syndrome

Carpal tunnel syndrome is more common in hemodialysis patients and is associated with dialysis related amyloid deposition and longer dialysis duration. Symptoms are in the median nerve distribution and often worsen at night. Nerve conduction studies confirm the diagnosis. Management ranges from splinting and therapy to surgical decompression. Coexisting access related ischemia or venous hypertension can exacerbate symptoms and should be evaluated.[26][27][28][29]

Ulnar neuropathy

Ulnar neuropathy occurs in a substantial minority of hemodialysis patients and may relate to positioning and compression during dialysis, ischemia from shunting, and amyloid deposition. Electromyography confirms diagnosis. Management is usually conservative, with surgical decompression for severe cases.[30]

Aneurysm and pseudoaneurysm

Arteriovenous fistula aneurysm

Aneurysmal dilation of AVFs is common and associated with repeated cannulation and outflow stenosis. Concerning findings include rapid expansion, prolonged post-dialysis bleeding, skin thinning, ulceration, and adherence of skin to the aneurysm.[31][32][33][34]

Asymptomatic aneurysms generally do not require repair. In symptomatic patients, evaluation for outflow stenosis and treatment of stenosis are important to reduce recurrence.[31]

Open repair is typically favored over endovascular repair due to lower thrombosis, fewer secondary interventions, reduced catheter need, and better long term function in comparative analyses. Techniques include aneurysmorrhaphy, resection with primary anastomosis, and interposition grafting, with aneurysmorrhaphy showing favorable patency in reported series. Staged repair can preserve dialysis function when multiple segments are involved.[32][35][36][37]

Pseudoaneurysm

Pseudoaneurysms occur predominantly in AVGs and are associated with repeated puncture and graft degeneration. Cannulation at the pseudoaneurysm site should be avoided. Small stable pseudoaneurysms may be observed. Indications for repair include enlargement, multiple pseudoaneurysms limiting cannulation sites, threatened skin integrity, or pain. Concern for infection requires graft excision.[33][38]

Bleeding from arteriovenous access

Access bleeding can rapidly become life threatening. Causes include pseudoaneurysm rupture, overlying skin ulceration, trauma, or graft integrity compromise from repeated cannulation, and persistent post cannulation bleeding may indicate venous outflow stenosis.[39]

Initial management includes firm direct pressure for 30 to 40 minutes. Non surgical hemostatic strategies and compression adjuncts have been described.[40]

If manual pressure fails, temporary proximal occlusion using a blood pressure cuff can be used. A superficial figure 8 or purse string stitch may be used as a temporizing measure, avoiding deep placement that could ligate the access. Tourniquet use should be brief to reduce neuromuscular risk. Urgent vascular access evaluation is required, and definitive management depends on etiology.[41]

Infection of arteriovenous access

Infection risk is lower in AVFs and higher in AVGs, with reported ranges approximately 0.56 percent to 5 percent for AVFs and 4 percent to 20 percent for AVGs. Organisms commonly include Staphylococcus species and Pseudomonas, and polymicrobial infections can occur. Virulent organisms increase risk of anastomotic disruption.[8][42]

Imaging may assist diagnosis. CT and ultrasonography can show perigraft fluid and inflammatory changes, and tagged leukocyte imaging has demonstrated higher sensitivity and specificity in vascular graft infection literature when CT is nondiagnostic.[43][44]

Management depends on extent and organism. Localized superficial AVF infection may be treated with broad spectrum antibiotics, while anastomotic involvement often requires ligation or revision with biologic conduit. For AVG infection, partial graft excision with segmental bypass may be considered for localized infection, while extensive infection, anastomotic involvement, occlusion, highly virulent organisms, or recurrent bacteremia generally favor total graft excision for source control.[45][46][47][48]

Anticoagulation

Dialysis patients tend to have greater risk of thrombosis due to increased factor VII activity, increased fibrinolytic activity, and elevated fibrinogen levels. However, uremic state may poses patients to bleeding diathesis. Also, dialysis procedure may increase turbulent blood flows with high shear stress which may activate platelets. All of these concepts emerge the use of anticoagulants during hemodialysis. Heparin (UFH) is the most frequently used form of anticoagulants. The usual heparin dose is 50 to 100 U/kg bolus at the initiation which followed by 100 U/hour. Activated clotting time (ACT) is measured in certain circumstances to assess the level of anticoagulation by maintaining it above 200 to 250 sec. Some patients have a higher risk of bleeding which requires a regional anticoagulation. In this method, extracorporeal dialyzer is heparinized in the arterial line and protamine is administered in the venous line. Another strategy is not using any forms of anticoagulation which hemodialysis is initiated with a high blood flow rate to decrease the risk of thrombosis and using saline flush technique which, the dialyzer is flushed with 50 mL of saline every 15 to 60 minutes.

High output heart failure due to arteriovenous access

Arteriovenous access creation can reduce systemic vascular resistance and increase cardiac output, and in some patients this contributes to high output heart failure. Risk factors include preexisting heart failure, brachial artery based access, larger anastomotic length, and high access flow.[49]

Clinical findings may include Nicoladoni Branham sign, where access compression produces transient hypertension and bradycardia.[50]

Echocardiography may show a hyperdynamic circulation and chamber dilation, and duplex ultrasound may show high access flow, often greater than 2000 mL per minute. Definitive attribution to access is supported when flow reduction improves cardiac function. Management options include flow reduction procedures or ligation, with ligation appropriate in patients who no longer require access after transplant.[51][52][53][54]

Monitoring and Adequacy

The dialysis adequacy is measured by using two factors, Kt/V and the urea reduction rate:

  • Kt/V: measures the ratio of cleared plasma (Kt) to the volume of urea distribution (V). The goal is to keep the ratio above 1.2 however, Kt/V higher than 1.4 may show more efficient dialysis.
  • Urea reduction ratio (URR): It reflects the removal of urea. URR is calculated by using the pre and post dialysis BUN measures. URR = (BUN pre-BUN post) / BUN pre It is recommended to keep URR 65% to 70%.

A typical hemodialysis is usually between 3 to 4 hours and three times a week. Blood flow is between 400 to 500 mL/min. However, for central venous catheter it might be lower about 350 to 400 mL/min. Dialysate flow rate is between 500 to 800 mL/min. Large size dialyzer may improve the adequacy.

References

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