Symptomatic Intradialytic Hypotension With a High Ultrafiltration Rate
Mrs. B is a 72-year-old woman receiving hemodialysis three times weekly for 4 hours via a left forearm arteriovenous fistula. Her dry weight is 58.0 kg and today's pre-dialysis weight is 61.2 kg, giving an ultrafiltration goal of 3.2 L. Pre-dialysis BP is 98/52 mmHg and heart rate 82. Dialysate sodium is 138 mEq/L, dialysate temperature 36.5°C, blood flow 350 mL/min, and UF rate is 800 mL/h. She took amlodipine 10 mg about 1 hour before treatment and ate a large meal in the waiting room. At 2 hours 45 minutes she reports nausea and leg cramps; BP is 78/42 mmHg, heart rate 96, and she is diaphoretic. The machine shows 2.4 L removed. The nurse considers only reducing the UF rate and continuing. She has no fever, chest pain, or bleeding. Her last three sessions also ended early because of cramps.
1. What immediate actions should the nurse take, in what order, and why is simply reducing the UF rate insufficient?
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Stop ultrafiltration immediately, place the patient supine or in Trendelenburg position, reduce blood flow, and give a rapid 100–200 mL isotonic saline bolus while monitoring BP and heart rate every 5 minutes. Apply oxygen if hypoxic and check glucose if symptoms suggest hypoglycemia.
Do not simply reduce UF and continue: BP 78/42 mmHg with nausea, cramps, and diaphoresis is significant symptomatic hypotension. If BP does not improve after one or two boluses, stop dialysis and call the nephrologist. Reassess dry weight and the 3.2 L goal; if fluid removal is still needed, resume at a lower UF rate only after stabilization. Document the event, saline volume, and response.
2. Which prescription and patient factors contributed to this event, and what changes should be recommended for future sessions?
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Contributors include a UF rate of 800 mL/h, about 13.8 mL/kg/h, which is high; a 3.2 kg interdialytic gain; pre-dialysis BP 98/52 mmHg; amlodipine taken 1 hour before treatment; a large meal causing splanchnic vasodilation; and dialysate temperature 36.5°C.
Recommend reviewing dry weight and fluid gain, limiting interdialytic sodium and fluid, shifting antihypertensive timing with the prescriber, avoiding heavy meals immediately before dialysis, and lowering dialysate temperature to 36.0–35.5°C if tolerated. Consider sodium profiling only with clear limits. A UF rate below about 13 mL/kg/h is desirable; this may require longer or more frequent sessions. Do not routinely use hypertonic saline for cramps.
3. What documentation, communication, and quality follow-up should occur after this event?
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Document the event, vital signs, interventions, response, and who was notified. Complete an incident or quality report and review whether the prescribed UF rate and antihypertensive timing are modifiable. Communicate the event at handover and with the nephrologist; give the patient written guidance about fluid gain, meal timing, and reporting dizziness.
Audit similar events monthly to identify prescription patterns. Recheck post-dialysis weight and BP, and plan the next session's UF goal before the patient leaves.