Management of Hypotension in Dialysis Patients

Assessment and Immediate Actions

• The American Journal of Kidney Diseases recommends measuring blood pressure properly, with the patient sitting quietly for 5 minutes with feet flat on the floor and arm supported at heart level before measurement, to assess for orthostatic hypotension, which is indicated by a drop of ≥15 mmHg systolic or ≥10 mmHg diastolic after standing for 2 minutes 1
• Blood pressure typically drops during and immediately after dialysis sessions, with the lowest readings occurring intradialytically and post-dialysis, according to the American Journal of Kidney Diseases and Kidney International 2, 3
• The Kidney International suggests reviewing symptoms, such as dizziness, weakness, fatigue, falls, syncope, chest pain, or confusion, to assess the patient's condition 4

Volume Status Evaluation

• The American Journal of Kidney Diseases states that determining if the patient is below their true dry weight is critical, as this is the most common cause of persistent hypotension in dialysis patients, and signs suggesting dry weight is too low include persistent hypotension despite adequate nutrition, increasing serum albumin and creatinine levels, improved appetite, and recurrent symptomatic hypotension 1, 3, 5
• The American Journal of Kidney Diseases recommends reassessing dry weight if the patient has been gaining muscle mass or improving nutritionally, as their dry weight target may need to be increased 5
• Excessive weight gains between sessions may paradoxically indicate the dry weight is set too low, causing the patient to drink more to compensate for chronic hypovolemia, according to the American Journal of Kidney Diseases 6

Medication Review and Adjustment

• The American Journal of Kidney Diseases suggests that antihypertensive medications are a common culprit and should be systematically reviewed, and that antihypertensive drugs taken in the morning before dialysis frequently cause intradialytic and post-dialysis hypotension, and should be switched to nighttime dosing 1, 3
• The Kidney International recommends considering dialyzability of medications, such as metoprolol, which may be removed during dialysis, causing rebound effects, and switching to non-dialyzable alternatives 3
• If blood pressure is consistently low at home (systolic <100 mmHg), the Kidney International suggests reducing or stopping antihypertensive medications, particularly if volume status is optimized 3, 7

Dietary and Fluid Management

• The American Journal of Kidney Diseases states that sodium and fluid intake directly impact blood pressure stability, and recommends maintaining 2-3 g/day sodium intake with regular dietitian counseling, and limiting interdialytic weight gain to <3 kg between sessions to reduce ultrafiltration requirements 1, 6
• Eating during or immediately before dialysis can worsen hypotension by causing splanchnic vasodilation, according to the Praxis Medical Insights 4

Dialysis Prescription Modifications

• The American Journal of Kidney Diseases recommends extending treatment time to >4 hours to allow slower ultrafiltration rates and better hemodynamic stability, and increasing treatment frequency to >3 times per week to reduce per-session ultrafiltration requirements 1, 6
• Lowering dialysate temperature to 35-36°C (instead of 37°C) increases peripheral vasoconstriction and reduces hypotensive episodes, according to the American Journal of Kidney Diseases and Kidney International 5, 6

Critical Safety Considerations

• The Kidney International states that both very low (<110 mmHg systolic) and very high blood pressure are associated with increased mortality in dialysis patients, and recommends targeting predialysis blood pressure of 110-140 mmHg systolic for most patients 3, 7
• Home blood pressure monitoring provides more accurate assessment of true blood pressure burden than pre- or post-dialysis blood pressure measurements, according to the Kidney International 3, 7

Management of Intradialytic Hypotension

Immediate Interventions During This Dialysis Session

• Maintaining a mean arterial pressure (MAP) ≥65 mmHg during the dialysis session is crucial to ensure adequate tissue perfusion and prevent end-organ ischemia in patients with intradialytic hypotension, as recommended by the Kidney International guidelines 8

Modifications for Subsequent Dialysis Sessions

• Increasing the target dry weight by 0.5-1.0 kg is recommended as the primary intervention for patients who cannot tolerate current ultrafiltration goals even with vasopressor support, according to the Kidney International guidelines 8
• A target weight that is too low can lead to hypotension and faster loss of residual kidney function, highlighting the importance of accurate dry weight assessment, as noted in the Kidney International guidelines 8
• Limiting the ultrafiltration rate to <6 mL/h/kg can help reduce mortality risk and prevent end-organ ischemia in patients with intradialytic hypotension, as suggested by the Kidney International guidelines 8

Common Pitfalls to Avoid

• Continuing aggressive ultrafiltration in a hypotensive patient requiring vasopressors can cause end-organ ischemia and increase mortality risk, and should be avoided, as warned by the Kidney International guidelines 8
• Avoiding the assumption that all hypotension requires more aggressive ultrafiltration is crucial, as excessive ultrafiltration may be causing the hypotension, as noted in the Kidney International guidelines 8

Management of Hypotension in Dialysis Patients

Definition and Classification

• Distinguish between intradialytic hypotension (occurring during treatment) versus persistent post-dialysis or interdialytic hypotension, as recommended by the American Society of Nephrology 9, 10

Medication Review and Adjustment

• Switch all antihypertensive drugs to nighttime dosing to reduce nocturnal BP surge and minimize intradialytic hypotension, as suggested by the National Kidney Foundation 10

Dietary and Fluid Management

• Maintain sodium intake at 2-3 g/day with regular dietitian counseling every 3 months, as recommended by the American Heart Association 10

Managing Hypotension in Dialysis Patients

Initial Assessment and Dialysis Prescription Modifications

• The American Journal of Kidney Diseases recommends reassessing and potentially increasing the target dry weight, followed by dialysis prescription modifications including slower ultrafiltration rates, extended treatment time, lower dialysate temperature (35-36°C), and sodium profiling, with midodrine as a pharmacological adjunct when these measures are insufficient 11, 12
• Key indicators that dry weight may be set too low include persistent hypotension despite adequate nutrition, rising serum albumin and creatinine levels indicating improved nutrition, and improved appetite with recurrent symptomatic hypotension 11, 12
• The Kidney International recommends reducing or discontinuing antihypertensives if home systolic blood pressure is consistently <100 mmHg 13

Dialysis Prescription Modifications

• Avoid excessive ultrafiltration and slow the ultrafiltration rate, as both volume and rate profoundly affect blood pressure 11, 12
• Extend treatment duration to >4 hours to allow slower, more hemodynamically stable fluid removal 11, 12
• Lower dialysate temperature to 35-36°C, which increases peripheral vasoconstriction and cardiac output through enhanced sympathetic tone, and reduces symptomatic hypotension from 44% to 34% of sessions 11, 12
• Increase dialysate sodium concentration, particularly early in treatment ("sodium ramping"), to ameliorate intradialytic hypotension and cramps 11, 12

Pharmacological Interventions

• Administer midodrine 30 minutes before dialysis initiation when non-pharmacological measures are insufficient, as it increases peripheral vascular resistance through arteriolar vasoconstriction 11, 12

Additional Supportive Measures

• Correct anemia to ranges recommended by guidelines, as anemia can exacerbate hypotension 12
• Consider administering supplemental oxygen during dialysis, as hypoxia can worsen hypotension 12

Modality Considerations

• For chronically hypotensive patients who cannot tolerate hemodialysis despite all interventions, consider transition to peritoneal dialysis, and reduce ultrafiltration volume by adjusting solutions, omit day dwell or night dwell in patients with significant residual kidney function, and liberalize salt intake 13