An observational study in Coronary Artery Disease, Left Ventricular Systolic Dysfunction and Gastric Contents, sponsored by Adiyaman University. Recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-11-06.
Sponsored by Adiyaman University · Observational
This study aims to investigate whether reduced heart function is associated with differences in stomach contents before elective coronary artery bypass graft (CABG) surgery. Patients undergoing elective cardiac surgery will be divided into two groups based on their left ventricular ejection fraction (LVEF), a measure of how well the heart pumps blood: patients with an LVEF below 40% and patients with an LVEF of 40% or higher. Before surgery, the researchers will use ultrasound to examine the stomach. They will assess the presence and amount of stomach contents using the Perlas grading system and ultrasound measurements of the gastric antrum. The main objective is to compare gastric ultrasound findings between the two groups. The researchers will also evaluate estimated gastric volume and the frequency of stomach findings associated with a higher risk of aspiration during anesthesia.
This prospective, single-center, observational cohort study will investigate the association between left ventricular systolic function and preoperative gastric ultrasonography findings in adult patients undergoing elective coronary artery bypass grafting (CABG) surgery.
A total of 50 patients will be enrolled consecutively and categorized into two groups according to preoperative left ventricular ejection fraction (LVEF): patients with LVEF \<40% (n=25) and those with LVEF ≥40% (n=25). Group allocation will be based on pre-existing cardiac function without any study-related intervention. Demographic characteristics, relevant comorbidities, preoperative medication use, gastrointestinal symptoms, fasting duration, and echocardiographic findings will be documented to evaluate potential factors associated with gastric ultrasound findings.
Preoperative gastric ultrasonography will be performed before induction of general anesthesia by an anesthesiologist experienced in point-of-care gastric ultrasound. The examiner will be blinded to the patients' clinical and echocardiographic findings, including LVEF values. A 2-5 MHz convex transducer will be used to examine the gastric antrum in the epigastric region, using standard anatomical landmarks. Gastric assessment will be performed in both the supine and right lateral decubitus (RLD) positions.
Gastric contents will be assessed qualitatively using the Perlas grading system. Grade 0 indicates an empty antrum in both positions; Grade 1 indicates clear fluid visible only in the RLD position; and Grade 2 indicates clear fluid visible in both positions or the presence of solid or particulate gastric contents.
The gastric antral cross-sectional area (CSA) will be calculated in the RLD position using the anteroposterior and craniocaudal diameters according to the formula:
CSA (cm²) = (AP diameter × CC diameter × π) / 4.
For patients with clear gastric fluid, gastric volume will be estimated using the Perlas mathematical model:
Estimated gastric volume (mL) = 27.0 + (14.6 × CSA) - (1.28 × age). Estimated gastric volume will also be expressed in mL/kg. The volume estimation model will not be applied to patients with solid or thick particulate gastric contents.
A high-risk stomach will be defined as an estimated gastric volume greater than 1.5 mL/kg or the presence of solid or thick particulate gastric contents.
The study will evaluate the association between left ventricular systolic function and preoperative gastric ultrasound findings, with particular emphasis on gastric content characteristics, antral dimensions, and indicators of increased gastric aspiration risk.
4,857 studies on the registry are indexed under Coronary Artery Disease; 890 are open to participants now.
This study's planned enrollment of 50 is below the median of 320 across 1,687 observational studies indexed under Coronary Artery Disease.
Browse Coronary Artery Disease studies →Adiyaman University is the lead sponsor of 31 studies on the registry; 11 are open to participants now.
Counted across the registry records on this site, refreshed daily.
The study population will consist of 50 adult patients (aged ≥18 years) who are scheduled for elective coronary artery bypass grafting (CABG) surgery with cardiopulmonary bypass at a single center. Eligible patients will be consecutively screened and enrolled after providing written informed consent. Participants will be categorized into two observational cohorts based on preoperative left ventricular ejection fraction (LVEF): LVEF \<40% (n=25) and LVEF ≥40% (n=25). No randomization or experimental treatment assignment will be performed.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
This cohort will include 25 adult patients scheduled for elective coronary artery bypass grafting (CABG) surgery with a preoperative left ventricular ejection fraction (LVEF) \<40%, as determined by transthoracic echocardiography. Before induction of general anesthesia, patients will undergo gastric ultrasonography to assess Perlas grade, gastric antral cross-sectional area, estimated gastric volume, and the presence of high-risk gastric contents. No experimental therapeutic intervention will be administered.
Diagnostic Test: Gastric Ultrasonography
This cohort will include 25 adult patients scheduled for elective coronary artery bypass grafting (CABG) surgery with a preoperative left ventricular ejection fraction (LVEF) ≥40%, as determined by transthoracic echocardiography. Before induction of general anesthesia, patients will undergo gastric ultrasonography to assess Perlas grade, gastric antral cross-sectional area, estimated gastric volume, and the presence of high-risk gastric contents. No experimental therapeutic intervention will be administered.
Diagnostic Test: Gastric Ultrasonography
Preoperative gastric ultrasonography will be performed before anesthesia induction by an experienced anesthesiologist blinded to LVEF values. Using a 2-5 MHz convex probe, the gastric antrum will be examined in supine and right lateral decubitus positions. Perlas grade, antral cross-sectional area, and gastric contents will be recorded. Gastric volume will be estimated only in patients with clear fluid. A high-risk stomach will be defined as gastric volume \>1.5 mL/kg or the presence of solid or thick particulate contents. The same protocol will be applied to both LVEF groups.
Distribution of Perlas Gastric Ultrasound Grades Between LVEF Groups
The primary outcome is the comparison of Perlas gastric ultrasound grade distributions between patients with LVEF \<40% and LVEF ≥40%. Gastric contents will be assessed before anesthesia induction using the Perlas grading system: Grade 0, empty antrum in both supine and right lateral decubitus positions; Grade 1, clear fluid visible only in the right lateral decubitus position; and Grade 2, clear fluid visible in both positions. The number and percentage of patients in each grade will be compared between groups.
Time frame: Preoperatively, immediately before induction of general anesthesia
Association Between LVEF and Estimated Gastric Volume (mL/kg)
The association between left ventricular ejection fraction (LVEF) and estimated gastric volume (mL/kg) will be evaluated in patients with clear gastric fluid. Gastric volume will be calculated using the Perlas formula: 27.0 + (14.6 × antral cross-sectional area in cm²) - (1.28 × age in years). The estimated volume will be divided by body weight to obtain mL/kg. The formula will not be applied to patients with solid or thick particulate gastric contents.
Time frame: Preoperatively, immediately before induction of general anesthesia
Gastric Antral Cross-Sectional Area (CSA)
Gastric antral cross-sectional area (CSA) will be measured using preoperative ultrasonography in the right lateral decubitus position. CSA will be calculated from the anteroposterior and craniocaudal diameters using the formula: CSA = (AP diameter × CC diameter × π) / 4. CSA values, expressed in cm², will be compared between patients with LVEF \<40% and those with LVEF ≥40%.
Time frame: Preoperatively, immediately before induction of general anesthesia
Presence of Solid Gastric Contents
The presence of solid or thick particulate gastric contents will be assessed using preoperative gastric ultrasonography in the supine and right lateral decubitus positions. Findings will be recorded as present or absent. The number and percentage of patients with solid or thick particulate gastric contents will be compared between the LVEF \<40% and LVEF ≥40% groups.
Time frame: Preoperatively, immediately before induction of general anesthesia
Prevalence of High-Risk Gastric Contents
A high-risk stomach will be defined as an estimated gastric volume \>1.5 mL/kg or the presence of solid or thick particulate gastric contents on preoperative ultrasonography. Gastric volume will be estimated only in patients with clear fluid contents. The number and percentage of patients meeting the high-risk stomach criteria will be compared between the LVEF \<40% and LVEF ≥40% groups.
Time frame: Preoperatively, immediately before induction of general anesthesia
Plan to share: No
No publications or documents are linked to this record.
Started Nov 2026 (actual). Primary completion is estimated for Mar 2027, 3 months after the start.
Of 634 non-industry observational studies under Coronary Artery Disease, half reached primary completion within 48 months of starting (the median), counting those still running; a quarter within 23 and three quarters within 122. This study's planned 3 months is below that.
Counting every sponsor, half of 759 studies reached it within 40 months; a quarter within 21 and three quarters within 87.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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