| Course | NR 567 Advanced Pharmacology for the Adult Gerontology Acute Care Nurse Practitioner |
|---|---|
| Week | 2 |
| Paper type | Critical illness dosing brief |
| Length | About 1,130 words, 6 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | MSN, Adult-Gerontology Acute Care NP (AGACNP) |
| Updated | October 2026 |
Free sample paper for NR 567 Week 2
Critical Illness Dosing Brief: Vancomycin for a 92-Kilogram Patient in Septic Shock on Continuous Venovenous Hemodiafiltration, With Load and Maintenance Kept Apart
Student Name
College of Nursing, Chamberlain University
NR 567: Advanced Pharmacology for the Adult Gerontology Acute Care Nurse Practitioner
Instructor Name
Month Day, Year
Critical Illness Dosing Brief: Vancomycin for a 92-Kilogram Patient in Septic Shock on Continuous Venovenous Hemodiafiltration, With Load and Maintenance Kept Apart
The Patient in Four Lines
A composite 66-year-old retired electrician, 92 kg, admitted to the intensive care unit on day 1 with severe community-acquired pneumonia and septic shock, intubated and on norepinephrine.
Resuscitated with about 5 liters of crystalloid in the first 24 hours; now visibly swollen, serum albumin down to 2.4.
Acute kidney injury progressed to anuria with a potassium of 6.4 mmol/L on day 2, and continuous venovenous hemodiafiltration (CVVHDF) began at an effluent rate of about 25 mL/kg/h.
Vancomycin was started on day 1 because the patient had been hospitalized and received intravenous antibiotics five weeks earlier, which raises the risk of methicillin-resistant Staphylococcus aureus.
The Parameter That Moved
Two things have changed at once, and they pull in opposite directions. First, the volume of distribution has expanded. Aggressive fluid resuscitation, capillary leak and a low albumin spread a water-soluble drug like vancomycin through a larger space, which lowers peak concentrations for a given dose. Critically ill patients often need higher initial doses than standard dosing would suggest for this reason (Roberts et al., 2014). Second, the patient's own kidneys have stopped clearing the drug, and clearance now depends almost entirely on the machine. A creatinine-based equation such as Cockcroft-Gault cannot describe this situation, because the creatinine is being removed by the filter and the kidneys are not doing the work the equation assumes.
Why Not Simply Use a Standard Dose
A standard regimen for an adult with normal kidneys, such as 15 to 20 mg/kg every 8 to 12 hours, would accumulate dangerously in a patient whose own kidneys clear almost nothing. The opposite instinct, to give a small dose because the patient is on dialysis, would leave the drug below its target during the first and most dangerous day. Both errors come from treating the patient as if one number described them. The brief separates the two questions, how much drug fills the body and how fast the body, here the machine, removes it, because they have different answers. Writing them separately also makes it clear to the next prescriber which part of the regimen should change when the circuit changes, and which part should not.
Who Owns the Calculation
The pharmacist on the intensive care unit team owns the vancomycin dosing and the AUC estimate, and records each level, the dose and the circuit status on the medication record. The bedside nurse records the hours the circuit actually ran each day, the effluent rate and any interruptions, because those are the numbers the pharmacist needs. The nephrology team informs the pharmacist before changing the dialysis prescription. Without this shared record, the recheck triggers in this brief cannot work.
Load and Maintenance, Apart
Loading dose. The loading dose depends on volume of distribution, not on clearance, so it is not reduced for kidney failure. For seriously ill adults the consensus range for the load runs from 20 up to 35 mg per kilogram, using the weight on the scale rather than an ideal weight, with 3,000 mg as the cap (Rybak et al., 2020). At 25 mg/kg and 92 kg, the load is 2,300 mg, rounded to 2,250 mg in 500 mL, infused over two hours to reduce infusion reactions. Giving a smaller load because of the kidneys would leave the patient underexposed for the first critical day.
Maintenance dose. Maintenance depends on clearance, which here is the clearance provided by CVVHDF. At effluent rates in this range, guidance suggests maintenance doses of about 7.5 to 10 mg/kg every 12 hours for patients on continuous renal replacement therapy, adjusted by measured levels (Rybak et al., 2020). At 92 kg, that is about 700 to 920 mg. The order is 750 mg every 12 hours, starting 12 hours after the loading dose began.
What the Machine Takes Out
Vancomycin is a relatively large molecule, but it passes through modern high-flux filters, so CVVHDF removes a substantial fraction. The amount removed depends on the effluent rate and on how many hours a day the circuit actually runs. Prescribed doses of continuous therapy are often not delivered in full, because circuits clot, filters are changed and patients leave the unit for scans. Every hour off the machine is an hour of near-zero clearance, which means levels rise. Every increase in effluent rate means levels fall. A dose that is correct on paper is only correct for the delivered therapy.
Target and Monitoring
The target is an area under the concentration-time curve (AUC) of 400 to 600 mg·h/L, assuming a minimum inhibitory concentration of 1 mg/L, which balances efficacy against kidney and other toxicity (Rybak et al., 2020). Because the patient is on continuous therapy and close to steady state soon after the loading dose, two levels drawn within the first 24 to 48 hours, or a single level with Bayesian software, are used to estimate the AUC. The pharmacist adjusts the dose to keep the estimate in range.
The Recheck Trigger
Levels are rechecked, and the dose reviewed, whenever any of the following occur: the CVVHDF circuit is off for more than six hours in a day; the effluent rate is changed by more than 20%; the patient is changed to intermittent hemodialysis; urine output returns above about 500 mL a day, suggesting kidney recovery; or the patient's volume status changes sharply, such as during large-volume fluid removal. Without these triggers, a dose that was right on day 2 can become toxic or inadequate by day 4.
When to Stop
Vancomycin is empiric. A methicillin-resistant Staphylococcus aureus nasal PCR was sent on admission. If it is negative and cultures show no staphylococci by 48 hours, the plan is to stop vancomycin, which is far better than any dosing adjustment at reducing toxicity. The review point is written into the order so that the drug does not continue by default.
The stop decision is recorded in the progress note with the PCR result and the culture status.
Other Considerations
Vancomycin combined with piperacillin-tazobactam has been associated with more acute kidney injury than vancomycin with other beta-lactams; here the partner agent is cefepime, which avoids that pairing (Luther et al., 2018). Cefepime itself accumulates in kidney failure and can cause neurotoxicity, so its dose is set to the CVVHDF clearance as well and the nurse watches for new confusion or myoclonus once sedation is lightened.
References
Luther, M. K., Timbrook, T. T., Caffrey, A. R., Dosa, D., Lodise, T. P., & LaPlante, K. L. (2018). Vancomycin plus piperacillin-tazobactam and acute kidney injury in adults: A systematic review and meta-analysis. Critical Care Medicine, 46(1), 12-20. https://doi.org/10.1097/CCM.0000000000002769
Roberts, J. A., Abdul-Aziz, M. H., Lipman, J., Mouton, J. W., Vinks, A. A., Felton, T. W., Hope, W. W., Farkas, A., Neely, M. N., Schentag, J. J., Drusano, G., Frey, O. R., Theuretzbacher, U., & Kuti, J. L. (2014). Individualised antibiotic dosing for patients who are critically ill: Challenges and potential solutions. The Lancet Infectious Diseases, 14(6), 498-509. https://doi.org/10.1016/S1473-3099(14)70036-2
Rybak, M. J., Le, J., Lodise, T. P., Levine, D. P., Bradley, J. S., Liu, C., Mueller, B. A., Pai, M. P., Wong-Beringer, A., Rotschafer, J. C., Rodvold, K. A., Maples, H. D., & Lomaestro, B. M. (2020). Therapeutic monitoring of vancomycin for serious methicillin-resistant Staphylococcus aureus infections: A revised consensus guideline and review by the American Society of Health-System Pharmacists, the Infectious Diseases Society of America, the Pediatric Infectious Diseases Society, and the Society of Infectious Diseases Pharmacists. American Journal of Health-System Pharmacy, 77(11), 835-864. https://doi.org/10.1093/ajhp/zxaa036
Reading the NR 567 Week 2 instructions
The dosing brief for this week usually asks how critical illness and organ support alter the dosing of one drug. Expect the prompt to ask for the patient's state, the pharmacokinetic changes, the dose and the monitoring. Keep the patient summary to a few lines. Name the parameter that has moved, such as volume of distribution after fluid resuscitation or clearance replaced by dialysis. Calculate the loading dose and the maintenance dose separately, because they answer different questions. Explain what the machine removes and how interruptions change that. Give a monitoring target and the events that should trigger a recheck. If the drug is empiric, say when it should stop. Cite current consensus dosing guidance.
How this NR 567 Week 2 example is built
The sample summarizes the patient in four lines: severe pneumonia with septic shock, five liters of fluid and a low albumin, anuria with continuous hemodiafiltration, and recent hospitalization that justified vancomycin. It explains that fluid has expanded the volume of distribution while clearance now depends on the filter. The load is calculated at 25 mg/kg of actual weight and rounded to 2,250 mg; maintenance is 750 mg every 12 hours from guidance for continuous renal replacement therapy. A section on the machine explains that circuit downtime raises levels and higher effluent lowers them. The target is an AUC of 400 to 600. Recheck triggers, a stop point tied to a nasal PCR, a section on who owns the calculation and a note on cefepime follow.
Reading the NR 567 Week 2 grading rubric
Dosing briefs here are usually assessed on whether the dose actually changes with the patient's state, whether loading and maintenance are separated, whether the effect of the machine is addressed, whether monitoring has a target and whether recheck triggers are named. A brief that quotes the creatinine and then gives the healthy adult dose loses the most, so this sample explains why that equation fails on dialysis. Separating the load, which depends on volume, from the maintenance, which depends on clearance, carries heavy weight. Describing how circuit downtime changes exposure shows practical understanding. An AUC target with its assumptions gives monitoring purpose. Specific triggers and a stop point show the brief is built for real days in the unit. Consensus citations support the numbers.
Common NR 567 Week 2 mistakes, and how to avoid them
The most expensive error in this brief is changing nothing: quoting the kidney numbers and then writing a standard dose. Another is applying a creatinine clearance equation to a patient whose kidney work is done by a machine. Many briefs combine load and maintenance into one figure, which hides the logic. Some describe the circuit without saying what it removes or how interruptions alter levels. Others give a level without a target, or omit any trigger to recheck. Write the patient briefly, name what moved, calculate the load and maintenance separately and say when to recheck and when to stop. A brief for another drug or another form of organ support can be worked through from your patient's details.
Get a NR 567 Week 2 example written to your instructions
Send the Week 2 instructions as your classroom issues them, with the organ, the support and the drug you want the arithmetic run on, and a custom example is written to that vignette. It comes back inside 24-48h, the first one costs nothing, and the calculation is shown line by line.
More NR 567 papers and AGACNP samples
- NR 567 Week 1: Status Epilepticus Route Discussion
- NR 567 Week 3: Titration Plan
- NR 567 Week 4: Vasoactive Support Write-up
- NR 567 Week 5: Sedation and Analgesia Plan
- NR 567 Week 6: Empiric Antimicrobial Rationale
- NR 567 Week 7: Anticoagulation Case Analysis
- NR 567 Week 8: De-escalation Plan
NR 567 Week 2 questions, answered
Does the brief need real equations, or is narrative enough?
It needs the arithmetic visible. A marker cannot tell a considered dose from a guess unless the working sits on the page: which parameter moved, in which direction, and what that does to the loading and maintenance components separately. The prose around it stays short. Two or three sentences of reasoning for each line of calculation is roughly the ratio the strongest examples hold.
Can it be written about a patient I actually looked after?
Send a vignette instead. Anything out of a real chart, the orders you signed on a shift, the hours you logged and any evaluation a preceptor puts a name to belongs to you and stays out of our hands. A constructed patient carrying the same disturbance in clearance produces the identical argument without putting a real record into a document that leaves your control.
What if the classroom supplies a template with fixed headings?
Send it and the example is written into it. Templates move where the argument sits, never whether it is present. The parameter that shifted, the two dose components and the recheck trigger all find a heading somewhere in a supplied form, and a submission that fills boxes without saying why the number changed loses exactly what it would lose free form.
Where can I find a free NR 567 Week 2 sample paper?
The vancomycin brief above, written for a patient on continuous hemodiafiltration with the load and maintenance calculated separately, is the complete NR 567 Week 2 sample. Send your own drug and patient for a worked brief.
Is the loading dose reduced for dialysis in the NR 567 Week 2 brief?
No. The load fills the volume of distribution and does not depend on clearance, so it is given in full; only the maintenance dose reflects what the machine removes.