Carbohydrate Loading on Insulin Resistance in Open Heart Surgery

Not Applicable

Completed

• Conditions: Heart Diseases

• Registration Number: NCT06901947
• Lead Sponsor: Indonesia University

Brief Summary

This study is a single-blind randomized clinical trial involving 40 adult patients undergoing elective open-heart surgery. The sample was allocated into two groups: 20 subjects in the oral carbohydrate fluid group and 20 subjects in the water group consumed 2 hours before surgery. Insulin resistance was measured by blood glucose levels, HOMA-IR index, and insulin tolerance tests. Postoperative outcomes were assessed by ICU stay duration, ventilator use, and hospital stay duration. Patient comfort factors were measured by hunger, thirst, nausea, and comfort levels.

Detailed Description

In general, preoperative fasting is mandatory for any kind of operations. This is intended to reduce the risk of aspiration during anesthesia procedure. According to recommendation from American Society of Anesthesiologist (ASA), fasting time limit is 8 hours for high calories food, 6 hours for moderate calories food, 4 hours for breastmilk, and 2 hours for clear fluid. Until today, many studies have shown that conventional fasting causes metabolic burden. Lengthy fasting period induces body's stress response, seen in increase in catabolic reaction, elevated contra insulin hormones such as glucocorticoid and catecholamine. In addition to that, surgical stimulus heightens this metabolic reaction which leads to insulin resistance. Insulin resistance causes hyperglycemia, which have a negative impact postoperatively. Several postoperative outcomes have been linked to insulin resistance, such as longer duration of ventilator and hospital stay, as well as the likelihood of postoperative infection. Cardio thorax surgery, as many other major surgeries pose a significant risk of metabolic derangement. Hyperglycemia is known to cause oxidative stress. As the risk of postoperative increases, the mortality and morbidity also increase. In the era of enhanced recovery after surgery, carbohydrate loading is given 2 hours before operation in attempt to improve outcome. Giving 50-250 grams of carbohydrate is expected to suppress catabolic process that usually occurs due to prolonged fasting. This strategy has been implemented in non cardiac surgery, which has shown benefit postoperatively. However, until today there are still limited studies regarding the use of carbohydrate loading on open heart surgeries. The investigators intend to evaluate the benefit of this practice on insulin resistance.

This study was a single-blind randomized clinical trial. The study took place in heart center of Ciptomangunkusumo (RSCM) Hospital and Jakarta Hear Center (JHC) Hospital, for 10 months starting from January 2023 to October 2023. Forty subjects were recruited following the approved ethical clearance by Ethics Committee, Universitas Indonesia. The investigators had a consecutive sampling with inclusion criteria of adult patients aged 18-65 years old who undergo open heart elective surgery and give their consent. The exclusion criteria are those with diabetes mellitus, gastroesophageal reflux, digestive malignancy, dementia, mental disturbances, as well as ASA classification of 4 or more. The drop out criteria applied were those who passed away during operation, experienced hypoglycemia with blood glucose \< 70 mg/dl, withdrew from the research, and were not able to finish the data sampling.

Study Timeline

• Study Start: 2023-01-01
• Primary Completion: 2023-10-10
• Study Completion: 2024-01-05
• Study First Submitted: 2024-07-15
• Status Verified: 2025-03
• Study First Submitted QC: 2025-03-23
• Last Update Submitted: 2025-03-28
• Study First Posted: 2025-03-30
• Last Update Posted: 2025-04-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Subjects age 18-65 years old undergoing elective open heart surgery
• Subjects giving informed consent

Exclusion Criteria

• Subjects with diabetes mellitus
• Subjects with gastroesophageal reflux
• Subjects with digestive malignancy
• Subjects with dementia
• Subjects with mental health
• Subjects with ASA 4 or more

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Insulin resistance difference between two groups	Within 30 minutes before and 30 minutes after operation	Insulin resistance seen in the level insulin sensitivity test (%/minute)
Operation outcome difference between two groups	From completion of operation to cessation of ventilator use or death, usually under 28 days	Operation outcome consists of duration of ventilator use (days)
Subjective well being difference between two groups	Preoperatively in the preparation room, usually around 1 hour before operation	Subjective well being in form of comfort (Yes or No)

Trial Locations

Locations (1)

Rumah Sakit Cipto Mangunkusumo; 🇮🇩 Jakarta Pusat, DKI Jakarta, Indonesia