CT Coronqry Angio + Graft Study at Chughtai Lab

CT Coronqry Angio + Graft Study at Chughtai Lab

The CT Coronqry Angio + Graft Study at Chughtai Lab is a highly specialized, non-invasive diagnostic imaging procedure designed to evaluate the coronary arteries and surgical bypass grafts in patients who have undergone Coronary Artery Bypass Graft (CABG) surgery. Utilizing state-of-the-art multi-detector computed tomography (MDCT) technology, this advanced scan provides high-resolution, three-dimensional images of the beating heart, the native coronary circulation, and the internal mammary artery or saphenous vein grafts. By combining rapid X-ray acquisition with electrocardiogram (ECG) gating, the scanner captures crystal-clear images during specific phases of the cardiac cycle, minimizing motion artifacts and delivering unparalleled diagnostic accuracy.

This examination is of paramount clinical importance for individuals presenting with recurrent chest pain, shortness of breath, or other symptoms suggestive of graft dysfunction or progressive coronary artery disease. Bypass grafts, particularly saphenous vein grafts, are prone to progressive atherosclerosis, stenosis, and eventual occlusion over time. The CT Coronqry Angio + Graft Study at Chughtai Lab offers a safe, highly reliable, and comfortable alternative to conventional invasive catheter angiography. It allows consultant cardiologists and cardiothoracic surgeons to visualize the entire course of each graft, assess the patency of the surgical connections (anastomoses), and evaluate the native coronary arteries for new or progressive blockages. With its exceptional negative predictive value, a normal scan can confidently rule out graft obstruction, saving patients from unnecessary invasive procedures.

Clinical Procedure: What to Expect

Patient Preparation

Proper patient preparation is vital to ensure the safety of the procedure and the acquisition of high-quality diagnostic images. Patients scheduled for a CT Coronqry Angio + Graft Study at Chughtai Lab must adhere to the following guidelines:

• Fasting Requirements: Patients should fast for at least 4 to 6 hours prior to the scheduled scan. Clear fluids, such as water, are permitted and highly encouraged to keep the body well-hydrated.
• Hydration: Adequate hydration before and after the scan is essential to assist the kidneys in efficiently filtering and excreting the iodinated contrast medium.
• Avoid Stimulants: Patients must strictly avoid caffeine (including coffee, tea, energy drinks, colas, and chocolate) and nicotine for 12 to 24 hours before the test. Stimulants elevate the heart rate, which can compromise image quality.
• Heart Rate Management: A slow, steady heart rate (ideally below 60 to 65 beats per minute) is required for optimal cardiac imaging. Depending on the patient’s baseline heart rate, oral or intravenous beta-blockers may be administered by the clinical team prior to the scan.
• Kidney Function Assessment: Because the study requires the injection of an iodinated contrast agent, patients must provide a recent Serum Creatinine and estimated Glomerular Filtration Rate (eGFR) report (typically performed within the last 30 days) to verify healthy kidney function.
• Medication Guidelines: Patients should continue taking their routine medications as prescribed, unless specifically instructed otherwise by their physician. Diabetic patients taking metformin must consult their doctor, as they may need to temporarily suspend the medication for 48 hours after the contrast injection.
• Clothing and Accessories: It is recommended to wear loose, comfortable clothing. Patients will be asked to change into a sterile patient gown and remove all metallic objects, including jewelry, necklaces, and underwire brassieres, as metal causes severe imaging artifacts.
• Allergy History: Any history of allergies, particularly to iodine, contrast media, or shellfish, must be disclosed to the medical staff beforehand. Pre-medication protocols may be initiated if a mild allergy is documented.

During the Procedure

Upon entering the CT suite at Chughtai Lab, the patient is positioned comfortably in a supine position (lying flat on their back) on the motorized CT scanner table. Electrocardiogram (ECG) electrodes are placed on the chest to monitor the heart rate in real-time and synchronize the CT scan with the cardiac cycle. An intravenous (IV) cannula is inserted into a suitable vein in the arm, typically the antecubital vein, to facilitate the rapid delivery of the contrast dye.

The CT scanner table slowly glides into the doughnut-shaped gantry. The technologist operates the equipment from an adjacent control room, maintaining continuous visual and voice communication through an intercom system. When the scan begins, an automated power injector delivers the iodinated contrast medium through the IV line. As the contrast enters the bloodstream, patients commonly experience a transient warm sensation spreading throughout the body, a metallic taste in the mouth, or the sensation of needing to urinate; these are normal reactions that subside within a minute.

The patient will be instructed to hold their breath for approximately 10 to 15 seconds during the image acquisition. Remaining perfectly still and holding the breath is absolutely critical to prevent motion blur on the images. The entire scanning process takes only a few minutes, while the total time spent in the department, including preparation, heart rate optimization, and post-procedure observation, is approximately 45 to 60 minutes.

When is a CT Coronqry Angio + Graft Study Performed?

Evaluation of Post-CABG Chest Pain (Angina)

Physicians frequently request a CT Coronqry Angio + Graft Study when a patient experiences recurrent or atypical chest pain after bypass surgery. This symptom can indicate that one or more of the surgical grafts have developed stenosis or complete occlusion, or that the native coronary artery disease has progressed. The scan allows clinicians to rapidly determine if the pain is cardiac in origin and localize the exact site of ischemia.

Assessment of Bypass Graft Patency

Over time, bypass grafts—especially saphenous vein grafts—can undergo degenerative changes, intimal hyperplasia, and atherosclerosis. This study is performed to systematically evaluate the patency of all arterial grafts (such as the Left Internal Mammary Artery) and venous grafts. It provides detailed anatomical information regarding the graft lumen, identifying any narrowing that could restrict blood flow to the myocardium.

Unexplained Shortness of Breath and Dyspnea

Shortness of breath, particularly during exertion, can be an anginal equivalent in patients who have undergone bypass surgery. When clinical signs are ambiguous, a CT Coronqry Angio + Graft Study is performed to rule out silent graft failure or myocardial ischemia. By visualizing the blood flow through the grafts, the test helps clinicians differentiate between cardiac-induced dyspnea and pulmonary conditions.

Pre-operative Planning for Redo Cardiac Surgery

If a patient requires a second cardiothoracic surgery (redo CABG or valve replacement), the surgeon must know the precise anatomical relationship of the existing bypass grafts to the sternum. A CT Coronqry Angio + Graft Study provides high-resolution 3D mapping of the mediastinum, showing the proximity of the grafts (especially the LIMA) to the chest wall, which helps prevent accidental damage during the sternotomy.

Evaluation of Silent Myocardial Ischemia

Diabetic patients and elderly individuals who have undergone CABG may not experience classic chest pain due to autonomic neuropathy. In these patients, silent myocardial ischemia can lead to heart failure or sudden cardiac events. Physicians order this non-invasive scan to proactively monitor graft health and myocardial perfusion when clinical suspicion is raised by abnormal electrocardiograms or stress tests.

What Does a CT Coronqry Angio + Graft Study Detect?

The CT Coronqry Angio + Graft Study is an exceptionally detailed examination capable of identifying a wide spectrum of cardiovascular pathologies. The scan can detect:

• Patent Left Internal Mammary Artery (LIMA) graft with normal flow
• Patent Right Internal Mammary Artery (RIMA) graft
• Patent Saphenous Vein Grafts (SVG)
• Complete occlusion of a Saphenous Vein Graft
• Significant stenosis at the proximal anastomotic site (where the graft connects to the aorta)
• Significant stenosis at the distal anastomotic site (where the graft connects to the native coronary artery)
• Atherosclerotic plaque accumulation within the body of the graft
• Soft, vulnerable, non-calcified lipid-rich plaques prone to rupture
• Calcified, stable plaques causing luminal narrowing
• Mixed calcified and non-calcified plaques
• Native coronary artery stenosis (LAD, LCx, RCA) distal to the graft insertion
• Progression of disease in non-bypassed native coronary arteries
• Graft aneurysms or pseudoaneurysms
• Surgical clip displacement or interference with graft flow
• Myocardial bridging, where a coronary artery runs through the heart muscle
• Anomalous coronary artery origins and courses
• Left ventricular hypertrophy (thickening of the heart muscle)
• Myocardial thinning or scarring suggestive of old myocardial infarction
• Pericardial effusion (fluid accumulation around the heart)
• Pericardial thickening or calcification
• Ascending aortic aneurysm or ectasia
• Aortic valve calcification and stenosis
• Mitral valve annular calcification
• Coronary artery dissection or graft dissection
• Intraluminal thrombus (blood clot) within a bypass graft
• Mediastinal lymphadenopathy (enlarged lymph nodes in the chest)
• Incidental pulmonary nodules or lung parenchymal changes
• Pleural effusion (fluid around the lungs)
• Hiatal hernia (protrusion of the stomach into the chest cavity)

Turnaround Time and Report Access at Chughtai Lab

At Chughtai Lab, the reporting process for a complex cardiac imaging study like the CT Coronqry Angio + Graft Study is handled with the utmost precision and care. Because this scan involves the generation of thousands of high-resolution images, specialized post-processing is required. Consultant radiologists utilize advanced cardiac software to perform multiplanar reformations, maximum intensity projections, and 3D volume-rendered reconstructions to meticulously trace each graft and native vessel.

The finalized, medically verified report is typically available within 24 to 48 hours after the completion of the scan. Chughtai Lab offers highly convenient digital report access to ensure patients and their referring physicians receive results promptly. Once the report is signed off by the consultant radiologist, patients receive an automated SMS notification containing a direct secure link to download their report. Reports and high-quality digital images can also be accessed online through the official Chughtai Lab patient portal or via the Chughtai Active mobile application. Physical copies of the report and a CD containing the complete DICOM image dataset can be collected directly from the diagnostic center.

CT Coronqry Angio + Graft Study Findings Overview

The following table outlines the key anatomical structures and parameters evaluated during the study, along with their corresponding normal and abnormal findings:

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
LIMA / RIMA Grafts	Fully patent lumen, uniform contrast opacification, no narrowing.	Stenosis, complete occlusion, localized spasm, or surgical clip compression.
Saphenous Vein Grafts (SVG)	Smooth vessel walls, patent lumen, no evidence of plaque or thrombus.	Atherosclerotic plaque, luminal stenosis, complete occlusion, thrombus, or aneurysm.
Native Coronary Arteries	No significant plaque, normal caliber, unobstructed distal run-off.	Calcified or soft plaques, significant luminal stenosis, total occlusion, or dissection.
Anastomotic Sites	Smooth, wide-caliber surgical connections without narrowing.	Anastomotic stenosis, intimal hyperplasia, or localized angulation.
Myocardium (Heart Muscle)	Normal thickness, uniform contrast enhancement, no perfusion defects.	Myocardial thinning, scarring from past infarction, hypertrophy, or perfusion defects.
Pericardium	Thin, smooth pericardial sac with minimal physiological fluid.	Pericardial effusion, thickening, calcification, or constrictive pericarditis.
Thoracic Aorta	Normal aortic caliber, smooth walls, no calcification or dissection.	Aortic aneurysm, ectasia, severe atheromatous plaque, or aortic dissection.
Extracardiac Structures	Clear lungs, normal mediastinum, no abnormal masses or fluid.	Pulmonary nodules, pleural effusion, lymphadenopathy, or hiatal hernia.

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Chughtai Lab for CT Coronqry Angio + Graft Study?

• Experienced Healthcare Professionals: The study is interpreted by highly trained consultant radiologists specializing in cardiovascular imaging, ensuring accurate and reliable reports.
• Patient-Focused Care: Chughtai Lab prioritizes patient comfort, safety, and clear communication at every stage of the diagnostic journey.
• Quality Diagnostic Services: Operating with a commitment to international standards, Chughtai Lab delivers high-precision diagnostic imaging and pathology services.
• Professional Reporting: Detailed, structured reports featuring high-resolution 3D reconstructions are provided to assist cardiologists in clinical decision-making.
• Modern Diagnostic Approach: Utilizing state-of-the-art multi-detector CT scanners capable of low-dose radiation protocols and rapid image acquisition.
• Comfortable Environment: The imaging suites are designed to provide a calm, clean, and professional environment to minimize patient anxiety.
• Convenient Location: With an extensive network of diagnostic centers across Pakistan, patients can easily access world-class imaging facilities close to home.
• Commitment to Accurate Diagnosis: Every scan undergoes rigorous quality control checks to ensure the highest level of diagnostic fidelity and clinical accuracy.