Small Benefits, No Harm, Low Certainty: Synthesizing Nine Studies on Preoperative Carbohydrate Drinks With GRADE and Writing a Recommendation the Anesthesia Department Can Act On
[Student Name]
University of Phoenix
DNP/710: Evidence-Based Practice Measurement and Clinical Inquiry
Week 5 Assignment
[Instructor Name]
[Date]
The synthesis is a model written for teaching purposes.
Three weeks of searching and appraisal left me with nine studies, two of which I examined closely last week. This paper synthesizes the whole body of evidence to answer my PICOT question: for nondiabetic elective surgery patients, does a carbohydrate drink taken 2 hours before surgery, compared with fasting from midnight, reduce thirst and hunger and improve recovery? It ends with a recommendation for our anesthesia department.
Organizing by Outcome
A synthesis that summarizes one study at a time leaves the reader to do the work. I organized the evidence by outcome: comfort, recovery and length of stay, complications and aspiration, and metabolic effects. For each outcome, I asked what the studies found together, how consistent they were and how much confidence the evidence deserves.
Rating Certainty With GRADE
Guyatt et al. (2008) describe GRADE as a system that rates the quality of evidence as high, moderate, low or very low for each important outcome and rates recommendations as strong or weak. Evidence from randomized trials begins at the top of the scale and loses a level for each serious problem the reviewer finds: flawed conduct, results that disagree, a population or outcome that does not match the question, wide confidence intervals or signs that small negative studies went unpublished. The strength of a recommendation depends on the balance of desirable and undesirable effects, the quality of evidence, values and preferences and costs.
Comfort Outcomes
Several trials, including one I appraised last week, found that a carbohydrate drink reduced thirst, hunger and anxiety compared with fasting. Effects were consistent in direction. However, most trials were small, unblinded when compared with fasting and used self-reported outcomes. I rate this evidence as moderate certainty, rated down one level for risk of bias.
Recovery and Length of Stay
In the Cochrane pooling by Smith et al. (2014), hospital stay was roughly a third of a day shorter with the drink than with fasting or placebo combined, a finding rated very low in quality, and the difference disappeared when the drink was compared with placebo alone. Two small trials suggested earlier return of bowel function. For our same-day patients, length of stay is largely irrelevant, which makes this evidence indirect for my population.
The evidence did not promise shorter stays; it promised a patient who is less thirsty, less hungry and no less safe.
Complications and Aspiration
Smith et al. (2014) found no increase or decrease in postoperative complications with carbohydrate treatment, based on 14 trials with 913 participants, and aspiration pneumonitis was not reported in any patient in either group. Brady et al. (2003), reviewing shortened fluid fasts, found no evidence that gastric volume or acidity increased when adults drank fluids closer to surgery. I rate safety evidence as moderate certainty: consistent, but aspiration is rare and few trials were designed to detect it.
Metabolic Effects
Carbohydrate treatment improved postoperative insulin sensitivity, with high-quality evidence in the Cochrane review (Smith et al., 2014). This effect is biologically plausible and may matter more after major surgery. For our patients, it is supportive rather than decisive.
The 2023 Guideline
The 2023 anesthesia guideline revision by Joshi et al. (2023) took up the specific question of sugared clear drinks before elective procedures. The update supports allowing these drinks up to 2 hours before the procedure in healthy adults and makes no change for higher-risk groups. A national guideline based on its own systematic review adds weight, particularly for anesthesiologists who will approve the change.
Balancing Benefits and Harms
Benefits include less thirst, hunger and anxiety, with moderate certainty, and possibly faster recovery, with low certainty. Harms appear minimal: no increase in complications and no aspiration events in the trials, with moderate certainty for the healthy adults in our population. Costs are low, about three dollars per patient for the drink. Patients' values strongly favor less discomfort, as our audit showed.
The Recommendation
For adults without diabetes or other risk factors for delayed gastric emptying undergoing elective surgery at our same-day surgery center, we recommend replacing nothing after midnight with instructions allowing clear liquids until 2 hours before scheduled surgery and a sugared clear drink finished at that two-hour mark. Strength: conditional, based on moderate-certainty evidence for comfort and safety and low-certainty evidence for recovery. Under GRADE, a conditional recommendation means most informed patients would choose this approach, but implementation should include monitoring.
Evidence Profile Summary
A one-page evidence profile for the council lists each outcome with the number of studies, the direction of effect, the certainty rating and the reason for any downgrade. Thirst and hunger: several trials, reduced, moderate, downgraded for risk of bias. Complications: 14 trials, no difference, low to moderate. Aspiration: no events reported, moderate for healthy adults, downgraded for imprecision because the event is rare. Length of stay: 19 trials, small reduction, very low, downgraded for risk of bias and indirectness. The profile lets decision makers see the whole picture at a glance.
Values and Preferences
Our audit found that nearly half of patients reported severe thirst, and several said they would have drunk water if told they could. Patients place high value on comfort before surgery and are unlikely to prefer prolonged fasting when a safe alternative exists. Anesthesiologists place high value on avoiding aspiration, which is why the exclusions and monitoring are central to the recommendation.
Why Not a Strong Recommendation
The evidence for comfort is consistent but at risk of bias, and our specific setting and population are not directly represented in the trials. A conditional recommendation, paired with a monitored pilot, is honest about that uncertainty and more persuasive to cautious colleagues than an overstated claim.
Exclusions
The recommendation excludes patients with diabetes, severe obesity, gastroparesis, bowel obstruction, pregnancy, and those taking medications that delay gastric emptying. These groups were either excluded from the trials or carry higher aspiration risk.
Implementation Considerations
A recommendation that cannot be carried out is of little use. The drink must be available to patients before the day of surgery, instructions must be clear about timing relative to the scheduled start and staff must know what to do if the schedule moves. These practical issues will shape the pilot design.
Gaps
None of the trials took place in an American ambulatory surgery setting like ours, and few measured quality of recovery after discharge. My project can add local evidence on those outcomes and on how patients experience the change.
Conclusion
Synthesized by outcome and rated with GRADE, the evidence shows that preoperative carbohydrate drinks reduce thirst, hunger and anxiety with moderate certainty, do not increase complications, and may modestly speed recovery with low certainty. A 2023 national guideline supports their use in healthy adults. The resulting conditional recommendation retires the midnight rule for eligible adults, with exclusions and monitoring built in.
References
Brady, M., Kinn, S., & Stuart, P. (2003). Preoperative fasting for adults to prevent perioperative complications. Cochrane Database of Systematic Reviews, 2003(4), Article CD004423. https://doi.org/10.1002/14651858.CD004423
Guyatt, G. H., Oxman, A. D., Vist, G. E., Kunz, R., Falck-Ytter, Y., Alonso-Coello, P., & Schünemann, H. J. (2008). GRADE: An emerging consensus on rating quality of evidence and strength of recommendations. BMJ, 336(7650), 924-926. https://doi.org/10.1136/bmj.39489.470347.AD
Joshi, G. P., Abdelmalak, B. B., Weigel, W. A., Harbell, M. W., Kuo, C. I., Soriano, S. G., Stricker, P. A., Tipton, T., Grant, M. D., Marbella, A. M., Agarkar, M., Blanck, J. F., & Domino, K. B. (2023). 2023 American Society of Anesthesiologists practice guidelines for preoperative fasting: Carbohydrate-containing clear liquids with or without protein, chewing gum, and pediatric fasting duration: A modular update of the 2017 American Society of Anesthesiologists practice guidelines for preoperative fasting. Anesthesiology, 138(2), 132-151. https://doi.org/10.1097/ALN.0000000000004381
Smith, M. D., McCall, J., Plank, L., Herbison, G. P., Soop, M., & Nygren, J. (2014). Preoperative carbohydrate treatment for enhancing recovery after elective surgery. Cochrane Database of Systematic Reviews, 2014(8), Article CD009161. https://doi.org/10.1002/14651858.CD009161.pub2
How this DNP 710 Week 5 example is structured
The DNP/710 Week 5 work usually synthesizes evidence into a recommendation. This paper groups findings by outcome, rates the certainty of each body of evidence, balances benefits against harms and writes a recommendation whose strength matches the evidence. Students search this week as DNP 710 Week 5, DNP710 Wk 5 or DNP/710 Wk 5; all three are the same assignment.
DNP/710 Week 5 questions, answered
What does DNP/710 Week 5 usually ask for?
Many sections ask students to synthesize appraised evidence into a recommendation for practice, stating the strength of the evidence and the recommendation.
What is GRADE?
A system for rating the certainty of a body of evidence as high, moderate, low or very low, and the strength of recommendations as strong or weak, based on risk of bias, inconsistency, indirectness, imprecision and publication bias, along with the balance of benefits and harms.
Can a recommendation be strong if the evidence is low certainty?
Sometimes; GRADE allows a strong recommendation when benefits clearly outweigh harms or when the intervention is low risk and aligns with values, but most low-certainty evidence leads to conditional recommendations.
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