Intradialytic Hypotension Management

Patient Risk Factors

• Patients with pre-existing cardiac dysfunction, elderly patients (≥65 years), diabetic patients with autonomic neuropathy, and those with poor nutritional status are at risk of intradialytic hypotension, and require high ultrafiltration rates 1
• Diastolic dysfunction, systolic dysfunction, valvular heart disease, pericardial disease, defective vascular reactivity, autonomic dysfunction, core temperature increase, diabetes mellitus, advanced age (≥65 years), female sex, poor nutritional status, severe anemia, and predialysis hypotension are risk factors for IDH, according to the American Journal of Kidney Diseases guidelines and Kidney International guidelines 2, 1
• Patients with diabetic CKD Stage 5, cardiovascular disease, poor nutritional status, autonomic dysfunction, severe anemia, requiring high-volume ultrafiltration, and predialysis SBP ≤100 mm Hg, are at particularly high risk for IDH, as stated by the American Journal of Kidney Diseases guidelines 2

Physical Examination and Assessment

• Physical examination techniques such as auscultation, palpation, and inspection can be used to assess patients for signs of stenosis or other abnormalities, including listening for abnormal high-frequency bruit, feeling for intravascular pressure along the veins, and looking for swelling or aneurysmal changes 3
• Intradialytic hypotension (IDH) is defined as a decrease in systolic blood pressure by ≥20 mm Hg or a decrease in mean arterial pressure by ≥10 mm Hg, associated with symptoms including abdominal discomfort, yawning, sighing, nausea, vomiting, muscle cramps, restlessness, dizziness, fainting, and anxiety, affecting approximately 25% of all hemodialysis sessions, according to the American Journal of Kidney Diseases guidelines 2

Dialysis Management

• Reducing ultrafiltration rates to below 6 ml/h per kg can minimize the risk of end-organ ischemia and mortality, with options including extending dialysis time, implementing sequential ultrafiltration/clearance, or considering isolated ultrafiltration periods, as recommended by the Kidney International and American Journal of Kidney Diseases 1, 4, 5
• Extending dialysis time can allow for more gradual fluid removal 1
• Regular reassessment of dry weight is necessary to avoid setting target weight too low, which may lead to hypotension 1
• Dietary counseling to limit sodium intake (2-3 g/day) can reduce interdialytic weight gain 1
• Reviewing timing of antihypertensive medications, considering administration at night rather than before dialysis, can help prevent hypotension, as suggested by Kidney International 1

Complications and Consequences

• Episodes of hypotension during hemodialysis may contribute to AVF thrombosis in some cases 3
• IDH has serious consequences, including impaired patient well-being, cardiac arrhythmias, predisposition to coronary and cerebral ischemic events, vascular access thrombosis, inadequate dialysis dose due to compartment effect, and long-term volume overload from suboptimal ultrafiltration, as stated by the American Journal of Kidney Diseases guidelines 2
• High interdialytic weight gain, requiring more aggressive fluid removal during dialysis, is a risk factor for IDH, as reported by the American Journal of Kidney Diseases guidelines 2

Treatment and Prevention

• Administering midodrine 5-10 mg orally 30 minutes before dialysis can help raise blood pressure by increasing peripheral vascular resistance and enhancing venous return, with significant improvement in minimal systolic pressure and post-dialysis blood pressure, as recommended by the American Journal of Kidney Diseases 4
• Reducing dialysate temperature to 34-35°C can increase peripheral vasoconstriction and cardiac output, reducing hypotensive episodes from 44% to 34%, as suggested by the American Journal of Kidney Diseases and Kidney International 4, 1
• Adjusting dialysate sodium concentration to 148 mEq/L, considering "sodium ramping", can reduce hypotension and cramps, while cautioning against increased interdialytic weight gain and blood pressure, as advised by the American Journal of Kidney Diseases 4
• Maintaining hemoglobin levels around 11 g/dL can help manage anemia and prevent hypotension, as recommended by the American Journal of Kidney Diseases 4
• Providing supplemental oxygen, especially for patients with cardiovascular or respiratory disease, can help manage low arterial pressure alarms in AVF dialysis patients, as recommended by the American Journal of Kidney Diseases 4
• Counseling patients on sodium restriction (2-3 g/day) can reduce interdialytic weight gain, as recommended by the American Journal of Kidney Diseases and Kidney International 4, 2
• Advising against eating immediately before or during dialysis, as food consumption decreases peripheral vascular resistance, potentially causing hypotension, is recommended by the American Journal of Kidney Diseases 4

Special Considerations

• Patients with diabetes or cardiomyopathy may require more gradual approaches to fluid removal, as recommended by the American Journal of Kidney Diseases guidelines 5
• Patients with frequent cramps may benefit from alternative dialysis modalities such as hemofiltration or hemodiafiltration, according to the American Journal of Kidney Diseases guidelines 2
• Administering L-carnitine for patients with persistent cramps unresponsive to other therapies, with dosing options including IV or oral administration, may improve muscle cramps, although evidence is mixed 6
• Starting baclofen at 10 mg/day with weekly increases of 10 mg/day up to 30 mg/day can demonstrate safety and efficacy in reducing muscle cramps 7