Postoperative Hypotension After Colectomy
Mr. R is a 68-year-old man on postoperative day 1 after an open sigmoid colectomy. He has hypertension and takes metoprolol; his baseline heart rate is 60–70. During the 0700 assessment, he is restless and says he 'feels off.' Vital signs: temperature 38.1°C, heart rate 118, blood pressure 88/52, respiratory rate 24, SpO2 94% on 2 L/min nasal cannula. Urine output is 15 mL/hr for the past 2 hours after averaging 40 mL/hr. The surgical drain has 150 mL of serosanguineous fluid in the last hour, compared with 30–50 mL/hr previously. Hemoglobin is 8.9 g/dL, down from 11.2 g/dL on admission; lactate is 3.2 mmol/L. He rates incisional pain 7/10 and has received one dose of enoxaparin. The surgeon's orders include 0.9% sodium chloride bolus, blood type and crossmatch, and notify provider for systolic BP below 90 or urine output below 30 mL/hr. The charge nurse asks you to triage him and a stable admission arriving in 20 minutes.
1. Which assessment findings are most concerning, and how do you distinguish postoperative bleeding from early sepsis? What is your first action?
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The most concerning cluster is hypotension (88/52), tachycardia (118), oliguria (15 mL/hr), falling hemoglobin (11.2 to 8.9 g/dL), and a drain output that has tripled to 150 mL/hr. Metoprolol can blunt the usual tachycardia, so a heart rate of 118 is especially abnormal. Bleeding is more likely than early sepsis because the drain volume and hemoglobin drop point to intravascular volume loss; early sepsis often produces warm, vasodilated skin, and fever can also occur after surgery without infection. However, sepsis cannot be excluded, so obtain cultures only after resuscitation is started and do not delay volume replacement.
First action: stay with the patient, call for help, assess ABCs, apply oxygen, place on continuous monitoring, establish a second large-bore IV (at least 18 gauge), begin the ordered crystalloid bolus, and notify the surgeon immediately while preparing blood products. Recheck vital signs every 15 minutes and monitor urine output and drain volume.
2. What should be delegated to the UAP and LPN, and what must remain with the RN? Include how you would communicate the plan.
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The RN must retain assessment, blood administration, IV push medications, care planning, and evaluation. The UAP can obtain vital signs, measure urine output and weight, assist with hygiene and bedpan, obtain supplies, and report changes; because the patient is unstable, the UAP should not be assigned sole care. The LPN can administer stable patients' oral medications, perform routine dressing changes, reinforce teaching, and monitor stable patients, but should not titrate vasoactive drugs or administer blood.
Communicate with a concise SBAR: situation (POD1 colectomy with hypotension and rising drain output), background (medications, baseline hemoglobin, urine output), assessment (suspected hemorrhage, hemoglobin drop, lactate 3.2), recommendation (surgeon at bedside, blood products, repeat labs). Assign the new admission to the LPN or new graduate with RN backup only after the unstable patient is stabilized.
3. Two hours after a 1-L crystalloid bolus and initiation of packed RBCs, BP is 102/64, HR is 104, urine output is 35 mL/hr, and drain output is 40 mL/hr. How do you evaluate response and what remaining risks require monitoring?
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A BP of 102/64 and urine output of 35 mL/hr suggest improved perfusion, but HR 104 and persistent drain output mean bleeding may continue. Evaluate trends, not single values: repeat hemoglobin, lactate, coagulation studies, platelet count, and renal panel; compare drain volume hourly. Monitor for transfusion reaction (fever, chills, urticaria, back pain, dark urine), fluid overload (crackles, JVD, edema), hypothermia, and citrate-related hypocalcemia. Keep the patient NPO in case of reoperation, maintain two IV sites, and continue frequent vital signs during and after transfusion. Report a rising heart rate, falling BP, increasing drain output, or worsening oliguria to the surgeon. Do not assume the response is adequate just because the BP improved; the underlying bleed may still require surgical control.