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Preoperative Gastric Volume and High-Risk Gastric Content in Patients With Type 2 Diabetes Mellitus

26 september 2026 bijgewerkt door: Fatma Cigdem Ozakin, Bakirkoy Dr. Sadi Konuk Research and Training Hospital

Clinical and Metabolic Determinants of High Residual Gastric Volume in Patients With Type 2 Diabetes Mellitus

This prospective observational study will evaluate adult patients with type 2 diabetes mellitus who are scheduled for elective surgery. Immediately before preoperative gastric ultrasonography, capillary fasting blood glucose will be measured.

Gastric contents will be assessed qualitatively in the supine and right lateral decubitus positions, and residual gastric volume will be estimated using the antral cross-sectional area measured in the right lateral decubitus position.

The primary objective is to evaluate the association between fasting capillary blood glucose and the presence of a high-risk stomach. A high-risk stomach will be defined as the presence of solid gastric contents, Perlas Grade 2 gastric contents, or an estimated gastric volume greater than 1.5 mL/kg.

Secondary objectives include determining the prevalence of a high-risk stomach and evaluating its associations with demographic characteristics, diabetes-related factors, comorbidities, fasting duration, medication use, gastroparesis-related symptoms, and routine laboratory parameters.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

This is a single-center, prospective observational study involving adult patients with type 2 diabetes mellitus scheduled for elective surgery.

On the day of surgery, participants will be evaluated in the preoperative preparation area before anesthesia induction and before administration of sedative premedication. Demographic data, diabetes duration and treatment, diabetes-related complications, comorbidities, smoking status, symptoms potentially associated with gastroparesis, fasting duration, and routinely available laboratory parameters will be recorded.

Capillary fasting blood glucose will be measured immediately before gastric ultrasonography and will constitute the primary independent variable.

Gastric ultrasonography will be performed by a trained and experienced investigator using a low-frequency convex transducer. The gastric antrum will be assessed first in the supine position and then in the right lateral decubitus position. Gastric contents will be classified as empty, clear fluid, or solid content. Clear fluid findings will additionally be classified according to the Perlas grading system.

For quantitative assessment, anteroposterior and craniocaudal diameters of the gastric antrum will be measured and the antral cross-sectional area will be calculated. Estimated gastric volume will be calculated from the right lateral decubitus antral cross-sectional area and expressed both in mL and mL/kg.

A high-risk stomach will be defined by at least one of the following findings: solid gastric contents, clear fluid visible in both the supine and right lateral decubitus positions (Perlas Grade 2), or estimated gastric volume greater than 1.5 mL/kg.

No experimental treatment or additional invasive intervention will be administered as part of the study. If clinically relevant high-risk gastric findings are identified, the responsible anesthesia team will be informed and subsequent anesthetic management will be determined by the clinical team.

Studietype

Observationeel

Inschrijving (Geschat)

120

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Locaties

  • Turkije (Türkiye)
    • Istanbul
      • Istanbul, Istanbul, Turkije (Türkiye), 34147
        • Bakırköy Dr. Sadi Konuk Training and Research Hospital
        • Contact:

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Bemonsteringsmethode

Niet-waarschijnlijkheidssteekproef

Studie Bevolking

Adult patients with type 2 diabetes mellitus who are scheduled for elective surgery at University of Health Sciences, Bakirkoy Dr. Sadi Konuk Training and Research Hospital and who meet the study eligibility criteria.

Beschrijving

Inclusion Criteria:

  • Age 18 years or older
  • Diagnosis of type 2 diabetes mellitus
  • American Society of Anesthesiologists (ASA) physical status II or III
  • Scheduled for elective surgery
  • Suitable for preoperative gastric ultrasonography
  • Provision of written informed consent

Exclusion Criteria:

  • Pregnancy
  • Body mass index ≥40 kg/m²
  • Emergency surgery
  • History of gastric, esophageal, or upper gastrointestinal surgery
  • Presence of a nasogastric tube
  • Known gastroparesis or gastric outlet obstruction
  • Active vomiting
  • Systemic opioid or prokinetic drug use within the previous 72 hours
  • Anatomical or technical conditions preventing adequate gastric ultrasonographic assessment
  • Impaired consciousness or inability to provide a reliable medical history
  • Refusal to participate in the study

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Observatiemodellen: COHORT
  • Tijdsperspectieven: PROSPECTIVE

Cohorten en interventies

Groep / Cohort
Interventie / Behandeling
Preoperative Patients With Type 2 Diabetes Mellitus

Adult patients with type 2 diabetes mellitus, ASA physical status II or III, who are scheduled for elective surgery and undergo preoperative gastric ultrasonography and capillary fasting blood glucose measurement.
Diagnostische toets: Preoperative Gastric Ultrasonography

The gastric antrum will be evaluated in the supine and right lateral decubitus positions before anesthesia induction and sedative premedication. Gastric contents will be assessed qualitatively, and antral cross-sectional area and estimated residual gastric volume will be calculated quantitatively.

Diagnostische toets: Capillary Fasting Blood Glucose Measurement

Capillary fasting blood glucose will be measured by fingertip sampling immediately before gastric ultrasonography. The measured glucose concentration will be evaluated as the primary exposure variable in relation to high-risk gastric findings.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Presence of a High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment immediately before anesthesia induction

A high-risk stomach will be defined as the presence of at least one of the following findings on preoperative gastric ultrasonography: solid gastric contents; clear fluid visible in both the supine and right lateral decubitus positions (Perlas Grade 2); or an estimated gastric volume greater than 1.5 mL/kg.
On the day of surgery, during the preoperative assessment immediately before anesthesia induction

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Association Between Age and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Age will be recorded in years from the patient's medical record. The association between age and the presence of a high-risk stomach (yes/no) will be evaluated .
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Sex and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Sex will be recorded as male or female from the patient's medical record. The association between sex and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Body Mass Index and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Body mass index will be calculated as body weight in kilograms divided by height in meters squared and reported in kg/m². The association between body mass index and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Duration of Type 2 Diabetes Mellitus and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Duration of type 2 diabetes mellitus will be recorded in years based on the patient's medical history and medical records. Its association with the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Diabetes-Related Complications and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

The presence of diabetes related target organ complications will be determined from the patient's medical history and medical records and recorded as present or absent. The association between the presence of diabetes-related complications and a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Comorbidities and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

The presence of comorbidity will be assessed from the patient's medical history and medical records. Prespecified comorbidities will include hypertension, gastroesophageal reflux disease, obstructive sleep apnea, hypothyroidism, chronic kidney disease, dialysis treatment, and liver dysfunction. Participants will be classified according to the presence or absence of at least one of these comorbidities. The association between the presence of any prespecified comorbidity and a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Gastroparesis-Related Symptoms and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Gastroparesis-related symptoms will be assessed by preoperative patient interview. Prespecified symptoms will include loss of appetite, early satiety, and postprandial fullness. Participants will be classified according to the presence or absence of at least one of these symptoms. The association between the presence of any gastroparesis-related symptom and a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Solid Food Fasting Duration and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

The time elapsed since the last solid food intake will be determined from the patient's history and clinical records and recorded in hours. Its association with the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Clear Fluid Fasting Duration and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

The time elapsed since the last clear fluid intake will be determined from the patient's history and clinical records and recorded in hours. Its association with the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Smoking Status and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Smoking status will be assessed by patient interview and categorized as current smoker, former smoker, or never smoker. The association between smoking status and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Antidiabetic Medication Use and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Current antidiabetic medication use will be determined from the patient's medication history and medical records. Antidiabetic medications will include oral antidiabetic drugs, insulin, GLP-1 receptor agonists, and SGLT-2 inhibitors. Participants will be classified according to the presence or absence of current use of at least one antidiabetic medication. The association between any current antidiabetic medication use and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Proton Pump Inhibitor Use and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Proton pump inhibitor use will be determined from the patient's medication history and recorded as yes or no. Its association with the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between HbA1c and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

HbA1c will be obtained from routine preoperative laboratory results and recorded as a percentage (%). The association between HbA1c and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Hemoglobin Level and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Hemoglobin concentration will be obtained from routine preoperative laboratory results and recorded in g/dL. The association between hemoglobin concentration and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Blood Urea Level and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Blood urea concentration will be obtained from routine preoperative laboratory results and recorded in mg/dL. The association between blood urea concentration and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction
Association Between Serum Creatinine Level and High-Risk Stomach
Tijdsspanne: On the day of surgery, during the preoperative assessment before anesthesia induction

Serum creatinine concentration will be obtained from routine preoperative laboratory results and recorded in mg/dL. The association between serum creatinine concentration and the presence of a high-risk stomach (yes/no) will be evaluated.
On the day of surgery, during the preoperative assessment before anesthesia induction

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Bakirkoy Dr. Sadi Konuk Research and Training Hospital

Onderzoekers

  • Hoofdonderzoeker: Fatma Çiğdem Özakın, MD, Bakirkoy Dr. Sadi Konuk Research and Training Hospital

Publicaties en nuttige links

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Algemene publicaties

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 oktober 2026

Primaire voltooiing (Geschat)

1 april 2027

Studie voltooiing (Geschat)

1 april 2027

Studieregistratiedata

Eerst ingediend

21 september 2026

Eerst ingediend dat voldeed aan de QC-criteria

21 september 2026

Eerst geplaatst (Werkelijk)

25 september 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

30 september 2026

Laatste update ingediend die voldeed aan QC-criteria

26 september 2026

Laatst geverifieerd

1 september 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 2026/317

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