NR 572 Week 6 Acute Management Case Analysis Example

Acute Management Case Analysis: A Volume-and-Beta-Blocker Explanation That Broke at 05:50 When Atropine Failed, and How the Plan Was Revised Over the Following Hour

Student Name

College of Nursing, Chamberlain University

NR 572: Advanced Acute Care Management

Instructor Name

Month Day, Year

Acute Management Case Analysis: A Volume-and-Beta-Blocker Explanation That Broke at 05:50 When Atropine Failed, and How the Plan Was Revised Over the Following Hour

The Patient Before the Night

The patient is a composite. Age 77, sharing a house with a sister. Permanent atrial fibrillation, treated with apixaban and 100 mg of metoprolol succinate each morning. A stiff left ventricle with normal pumping fraction, treated with lisinopril, spironolactone and furosemide. Kidney disease at stage 3a, creatinine usually 1.2. Type 2 diabetes, diet only. The patient was admitted at 16:00 after three days of watery diarrhea, picked up during an outbreak at a senior center. On admission the pressure was 104/62, the heart rate 64 in atrial fibrillation, the creatinine 1.9 and the potassium 5.4.

The First Half: What Was Known Before the Turn

The admitting team held lisinopril and furosemide, started intravenous fluid at 75 mL per hour and continued metoprolol and spironolactone. The decision to continue metoprolol was reasonable on what was known: the heart rate was 64 in atrial fibrillation, and stopping a beta blocker abruptly can cause a rebound rise in rate. The decision to continue spironolactone, with a potassium of 5.4 and a rising creatinine, was not defended anywhere in the admission note; it appears to have been carried forward from the home list.

At 05:40 the nurse called: the pulse had dropped into the 30s and the systolic pressure into the 70s. The working explanation my preceptor and I formed at the bedside was volume depletion with an excessive beta blocker effect. It fit: six stools overnight, little intake, a full dose of metoprolol the morning before, and kidney function worsening, which would slow the clearance of metoprolol's active effect. On that explanation, the right first steps were atropine and fluid. Atropine 1 mg went in at 05:47 and a 500 mL bolus at 05:48. A stat chemistry panel went to the central laboratory at 05:49.

The Turn: 05:50

At 05:50, three minutes after atropine, the rate was still 34. That was the turn. Atropine works by blocking the vagus nerve's effect on the node; when it does nothing, the cause is less likely to be vagal and more likely to be at or below the node, or a problem atropine cannot reach, such as a drug effect combined with an electrolyte disturbance. On the 05:46 tracing the complexes measured 118 milliseconds across, and the T waves in V2 to V4 stood tall and pointed. Taken together with the kidney injury, the spironolactone and the lisinopril until admission, the failed atropine broke the working explanation. It did not prove hyperkalemia, but it made a volume-and-beta-blocker explanation insufficient on its own.

The Second Half: Revision as a Sequence

05:52. Decision to give calcium before the potassium result. The bradycardia guideline asks clinicians to look for reversible causes, including electrolyte problems and drug effects (Kusumoto et al., 2019). The price of calcium was small; the price of 30 minutes at that pressure was not.

05:55. Calcium gluconate 3 g intravenously.

06:00. Heart rate 52, pressure 92/54, patient more alert. The response to calcium was itself evidence: calcium stabilizes the heart's membrane against a high potassium and would not be expected to lift a rate slowed only by a beta blocker in this way.

06:10. A working differential brief aimed treatment at hyperkalemia acting with the nodal blocker, while continuing fluid for the volume loss. Insulin with dextrose and albuterol were prepared but held until the result, since the response to calcium had bought time.

06:20. Potassium 6.6, creatinine 2.9, bicarbonate 17. The revised explanation now had its number.

06:25. Rate back to 40 as the calcium wore off. Second calcium, insulin with dextrose, albuterol and a second liter of fluid, all at once. Metoprolol, spironolactone and lisinopril discontinued in the record.

06:32. Rate 46, pressure 80/46 despite calcium. Epinephrine infusion started at 2 micrograms per minute.

06:40. Rate 60, pressure 98/58. Intensive care team at the bedside.

06:50. Transfer to intensive care.

What Was Withdrawn

Two things were withdrawn as the explanation changed. The plan to give a second dose of atropine, which my preceptor had suggested at 05:50, was dropped once the first failed and the ECG was reviewed. And the working idea of a pure beta blocker problem, which would have led toward glucagon, was set aside; glucagon remained a fallback if the potassium had come back normal.

Evidence Behind the Decisions

What this patient showed has a name in the emergency literature, where Farkas et al. (2020) explain how a potassium that looks only moderately high can still stop a heart when a nodal blocker is on board. That description defends two decisions: giving calcium before the result, and treating the potassium and the nodal blocker together rather than choosing between them. The hyperkalemia conference summary supports the sequence of calcium, then shifting therapy, then removal, with frequent rechecks (Lindner et al., 2020).

Outcome, Kept Brief

In intensive care, no dialysis was needed; by noon the potassium was 5.4, and by evening it was below 5. Epinephrine stopped at 14:00. The patient returned to the ward on day 3.

What the Ward Could Have Seen Earlier

The chart held a warning before 05:40. At 22:00 the heart rate was 60 and the pressure 102/60; at 02:00 they were 52 and 96/58, and the early warning score had risen to 3 without a call. No vital signs were taken at 04:00 because the patient was asleep. Early warning scores built from vital signs discriminate well for patients at risk of arrest, unplanned intensive care transfer and death (Smith et al., 2013), but a score helps only if a rise prompts someone to look. Here the falling rate and pressure over eight hours were each within the range a busy night might accept, and only the trend was abnormal.

Honest Assessment

The first plan was reasonable on what was known, and the revision took 13 minutes from the turn to calcium, which I would defend. The weak point came earlier: spironolactone stayed on the admission orders, beside a borderline potassium and a creatinine already climbing, and no one wrote down why. That decision is the one I would change, and it was made 14 hours before the night began. A medication reconciliation that asked of each home drug whether it still made sense with this creatinine and this potassium would have caught it.

References

Farkas, J. D., Long, B., Koyfman, A., & Menson, K. (2020). BRASH syndrome: Bradycardia, renal failure, AV blockade, shock, and hyperkalemia. Journal of Emergency Medicine, 59(2), 216-223. https://doi.org/10.1016/j.jemermed.2020.05.001

Kusumoto, F. M., Schoenfeld, M. H., Barrett, C., Edgerton, J. R., Ellenbogen, K. A., Gold, M. R., Goldschlager, N. F., Hamilton, R. M., Joglar, J. A., Kim, R. J., Lee, R., Marine, J. E., McLeod, C. J., Oken, K. R., Patton, K. K., Pellegrini, C. N., Selzman, K. A., Thompson, A., & Varosy, P. D. (2019). 2018 ACC/AHA/HRS guideline on the evaluation and management of patients with bradycardia and cardiac conduction delay. Circulation, 140(8), e382-e482. https://doi.org/10.1161/CIR.0000000000000628

Lindner, G., Burdmann, E. A., Clase, C. M., Hemmelgarn, B. R., Herzog, C. A., Malyszko, J., Nagahama, M., Pecoits-Filho, R., Rafique, Z., Rossignol, P., & Singer, A. J. (2020). Acute hyperkalemia in the emergency department: A summary from a Kidney Disease: Improving Global Outcomes conference. European Journal of Emergency Medicine, 27(5), 329-337. https://doi.org/10.1097/MEJ.0000000000000691

Smith, G. B., Prytherch, D. R., Meredith, P., Schmidt, P. E., & Featherstone, P. I. (2013). The ability of the National Early Warning Score (NEWS) to discriminate patients at risk of early cardiac arrest, unanticipated intensive care unit admission, and death. Resuscitation, 84(4), 465-470. https://doi.org/10.1016/j.resuscitation.2012.12.016