CT SCAN ANGIOGRAPHY PULMONARY (DELDC) at Dr. Essa Lab

CT SCAN ANGIOGRAPHY PULMONARY (DELDC) at Dr. Essa Lab

The CT SCAN ANGIOGRAPHY PULMONARY (DELDC) at Dr. Essa Lab is a highly specialized, state-of-the-art diagnostic imaging procedure designed to visualize the arterial vasculature of the lungs with exceptional anatomical detail. Commonly referred to as Computed Tomography Pulmonary Angiography (CTPA), this non-invasive imaging modality is the clinical gold standard for diagnosing acute and chronic pulmonary vascular disorders. By utilizing advanced multi-slice computed tomography (CT) technology combined with the rapid intravenous administration of iodinated contrast media, the scan produces high-resolution, three-dimensional cross-sectional images of the pulmonary arteries. This allows radiologists and referring physicians to evaluate the pulmonary circulation in real-time, facilitating rapid, life-saving clinical decisions in emergency and outpatient settings alike.

During a CT SCAN ANGIOGRAPHY PULMONARY (DELDC), the scanner captures thin-slice images of the chest during the peak phase of contrast enhancement within the pulmonary arterial tree. This precise timing is achieved using automated bolus-tracking software, which triggers the scan the moment the contrast agent reaches its maximum concentration in the main pulmonary trunk. The primary anatomical structures evaluated include the main pulmonary artery, the right and left main pulmonary arteries, and their subsequent lobar, segmental, and subsegmental branches. Additionally, the scan provides a comprehensive view of the surrounding thoracic anatomy, including the cardiac chambers (specifically the right ventricle and atrium), the thoracic aorta, the superior vena cava, the pulmonary veins, the lung parenchyma, the mediastinum, and the pleural spaces. This holistic anatomical assessment is invaluable for identifying not only primary vascular pathologies but also secondary parenchymal or pleural conditions that may mimic vascular symptoms.

The clinical importance of this diagnostic tool cannot be overstated. Pulmonary vascular diseases, particularly acute pulmonary embolism (PE), are associated with high rates of morbidity and mortality if left untreated. By offering a rapid, highly sensitive, and highly specific diagnostic pathway, the CT SCAN ANGIOGRAPHY PULMONARY (DELDC) at Dr. Essa Lab enables clinicians to confirm or rule out life-threatening conditions within minutes. The high-speed imaging capabilities of modern multi-slice CT scanners minimize motion artifacts caused by respiration or cardiac activity, ensuring superior image quality even in critically ill or dyspneic patients. This diagnostic precision helps avoid the risks of unnecessary anticoagulation therapy in patients without thromboembolic disease while ensuring immediate, appropriate therapeutic intervention for those who require it.

Clinical Procedure: What to Expect

Patient Preparation

Proper patient preparation is essential to ensure diagnostic accuracy, patient safety, and optimal image quality during a CT SCAN ANGIOGRAPHY PULMONARY (DELDC). Patients are advised to adhere to the following guidelines prior to their scheduled appointment:

• Fasting Requirements: Patients must fast (nothing by mouth, including solid foods and liquids other than water) for at least 4 to 6 hours prior to the scan. This minimizes the risk of nausea, vomiting, and potential aspiration associated with the intravenous administration of iodinated contrast media.
• Renal Function Assessment: Because the procedure requires the injection of an iodinated contrast agent, patients must provide recent laboratory results for Serum Creatinine and Estimated Glomerular Filtration Rate (eGFR), typically performed within the last 30 days. This is crucial to assess kidney function and prevent contrast-induced nephropathy (CIN).
• Allergy History and Pre-medication: Patients must inform the clinical staff of any known history of allergies, particularly to iodinated contrast media, shellfish, or specific medications. If a prior mild-to-moderate contrast allergy is documented, a prophylactic regimen of corticosteroids and antihistamines may be prescribed by the physician prior to the scan.
• Hydration: Unless contraindicated by a medical condition such as congestive heart failure or severe renal impairment, patients should drink plenty of water before and after the procedure. Adequate hydration helps protect the kidneys and facilitates the rapid clearance of the contrast medium from the body.
• Clothing and Metallic Objects: Patients should wear loose, comfortable clothing. Before entering the scan room, they will be asked to change into a patient gown and remove all metallic objects from the chest and neck area, including necklaces, piercings, underwire bras, and clothing with metallic zippers or buttons, as these can cause severe streak artifacts on the images.
• Medication Review: Patients must provide a complete list of their current medications. Diabetic patients taking metformin-containing medications may need to temporarily suspend their use for 48 hours following the contrast injection, subject to their physician’s guidance and post-procedure renal function verification.
• Pregnancy and Lactation: Female patients must inform the technologist if they are pregnant or suspect they might be. While CTPA can be performed in pregnant patients when clinically indicated (as the risk of untreated pulmonary embolism outweighs the radiation risk), special low-dose protocols and abdominal shielding are utilized. Lactating mothers may continue breastfeeding, as minimal contrast is excreted in breast milk, though some choose to express and discard milk for 24 hours post-procedure.

During the Procedure

The CT SCAN ANGIOGRAPHY PULMONARY (DELDC) is a highly coordinated, rapid procedure designed to maximize patient comfort and safety while obtaining diagnostic-quality images. The step-by-step process includes:

• Intravenous Access: Upon arrival, a qualified nurse or technologist will place a high-flow intravenous (IV) cannula, typically an 18-gauge or 20-gauge needle, into a large vein in the antecubital fossa (the bend of the elbow). This large-bore cannula is necessary to withstand the high injection pressures (up to 325 psi) required to deliver the contrast agent at a rapid flow rate of 4 to 5 milliliters per second.
• Patient Positioning: The patient is positioned supine (lying flat on their back) on the motorized CT scanner table. The arms are raised and secured comfortably above the head. This positioning is critical to prevent beam-hardening artifacts that occur when the arms are positioned at the sides of the chest, which can degrade the quality of the pulmonary artery images.
• Contrast Connection: The IV cannula is connected to an automated dual-syringe power injector. One syringe contains the iodinated contrast medium, while the second contains a saline chaser. The saline chaser is injected immediately after the contrast to push the contrast bolus forward, clear the superior vena cava of dense contrast (which causes artifacts), and optimize the enhancement of the pulmonary arteries.
• The Scanning Process: The motorized table slides smoothly into the circular opening (gantry) of the CT scanner. A preliminary scout scan is performed to plan the precise imaging volume, extending from the lung apices to the diaphragm. The technologist then initiates the contrast injection. As the contrast enters the bloodstream, the patient may experience a transient warm sensation throughout the body, a metallic taste in the mouth, or the sensation of needing to urinate. These are normal, harmless physiological responses that resolve within a few minutes.
• Breath-Hold Command: The scanner utilizes automated bolus-tracking technology. Once the contrast reaches the optimal density in the main pulmonary artery, the scanner automatically triggers the high-resolution acquisition. An automated voice command will instruct the patient to take a breath in and hold it still for approximately 5 to 10 seconds. It is vital that the patient remains completely still and holds their breath to eliminate respiratory motion, which can obscure small blood clots in the subsegmental branches.
• Duration and Post-Scan Care: The active scanning process takes less than 10 seconds, while the entire procedure, including positioning and IV setup, takes about 15 to 20 minutes. After the scan is complete, the patient is monitored for 15 to 30 minutes to ensure there are no delayed allergic reactions to the contrast medium. The IV cannula is then removed, and the patient is advised to drink plenty of fluids throughout the day.

When is a CT SCAN ANGIOGRAPHY PULMONARY (DELDC) Performed?

Suspected Acute Pulmonary Embolism (PE)

The most common and critical clinical indication for a CT SCAN ANGIOGRAPHY PULMONARY (DELDC) is the suspicion of an acute pulmonary embolism (PE). This occurs when a blood clot, typically originating from a deep vein thrombosis (DVT) in the lower extremities, embolizes and becomes lodged in the pulmonary arterial circulation. Patients presenting with sudden-onset dyspnea (shortness of breath), pleuritic chest pain, tachypnea, unexplained tachycardia, or hemoptysis are evaluated using clinical prediction rules such as the Wells’ Score or Geneva Score. If these scores, combined with an elevated D-dimer assay, indicate a moderate-to-high probability of PE, a pulmonary CT angiography is urgently performed to confirm the diagnosis, locate the clot, and assess its impact on the pulmonary circulation.

Unexplained Pulmonary Hypertension

Pulmonary hypertension is characterized by abnormally high blood pressure in the pulmonary arteries, leading to progressive right-sided heart failure. When the etiology of pulmonary hypertension remains unclear after initial non-invasive testing (such as echocardiography), a CT pulmonary angiography is performed. This scan is crucial for identifying Chronic Thromboembolic Pulmonary Hypertension (CTEPH), a treatable form of pulmonary hypertension caused by chronic, organized blood clots that narrow or occlude the pulmonary vessels. The scan helps differentiate CTEPH from other causes, such as idiopathic pulmonary arterial hypertension or pulmonary hypertension associated with left heart disease or chronic lung disease.

Evaluation of Pulmonary Vascular Anomalies

Physicians request a CT SCAN ANGIOGRAPHY PULMONARY (DELDC) to evaluate suspected congenital or acquired pulmonary vascular anomalies. These include pulmonary arteriovenous malformations (AVMs), pulmonary artery aneurysms, pseudoaneurysms, and congenital vascular variants such as anomalous pulmonary venous return or pulmonary artery sling. Patients with pulmonary AVMs may present with unexplained hypoxemia, cyanosis, clubbing, or recurrent hemoptysis. The high-resolution three-dimensional reconstructions provided by this scan allow cardiothoracic surgeons and interventional radiologists to map the precise vascular anatomy, identify feeding arteries and draining veins, and plan targeted interventions such as transcatheter embolization or surgical resection.

Pre-operative Planning and Post-surgical Follow-up

This advanced imaging modality is frequently utilized for pre-operative planning and post-operative monitoring in patients undergoing complex cardiothoracic or pulmonary surgeries. For patients scheduled for pulmonary thromboendarterectomy (the surgical removal of chronic clots), a detailed CTPA provides a roadmap of the vascular obstructions. Post-operatively, the scan is performed to assess the patency of the reconstructed pulmonary vessels, evaluate the resolution of pulmonary hypertension, and detect potential surgical complications such as anastomotic stenosis, graft thrombosis, or localized pseudoaneurysms.

Assessment of Thoracic Trauma and Vascular Injury

In cases of severe blunt or penetrating thoracic trauma, such as high-velocity motor vehicle accidents or fall injuries, rapid assessment of the mediastinal vasculature is critical. A CT SCAN ANGIOGRAPHY PULMONARY (DELDC) is performed in the emergency setting to detect acute vascular injuries, including pulmonary artery lacerations, transections, active contrast extravasation (indicating active bleeding), or traumatic pseudoaneurysms. The speed and comprehensive nature of the scan allow trauma teams to simultaneously evaluate the lungs for contusions, lacerations, pneumothorax, and hemothorax, guiding immediate surgical or endovascular life-saving interventions.

What Does a CT SCAN ANGIOGRAPHY PULMONARY (DELDC) Detect?

A CT SCAN ANGIOGRAPHY PULMONARY (DELDC) is highly sensitive and capable of detecting a wide range of vascular, parenchymal, and mediastinal pathologies. The primary findings and abnormalities that can be identified include:

• Acute Pulmonary Embolism: Visualized as sharp, intraluminal filling defects within the contrast-filled pulmonary arteries, which may be central (saddle embolus), lobar, segmental, or subsegmental.
• Chronic Pulmonary Embolism: Identified by eccentric, wall-adherent filling defects, web-like stenoses, complete arterial occlusions with vessel caliber reduction, or calcified chronic thrombi.
• Right Ventricular (RV) Strain: Indicated by a right-to-left ventricular (RV/LV) diameter ratio of greater than 1.0, flattening or paradoxical leftward bowing of the interventricular septum, and contrast reflux into the inferior vena cava.
• Pulmonary Artery Aneurysm: Abnormal, localized dilatation of the main or branch pulmonary arteries, which carries a risk of rupture.
• Pulmonary Arteriovenous Malformations (AVMs): Direct connections between pulmonary arteries and veins without an intervening capillary bed, visualized as a dilated feeding artery and an enlarged draining vein.
• Pulmonary Artery Stenosis: Congenital or acquired narrowing of the pulmonary arterial lumen, causing restricted blood flow and secondary pulmonary hypertension.
• Pulmonary Infarction: Wedge-shaped, pleural-based consolidations (Hampton’s hump) in the lung parenchyma, representing tissue necrosis secondary to severe arterial occlusion.
• Pulmonary Artery Sarcoma: A rare primary malignant tumor of the pulmonary artery, often mimicking a large saddle embolus but characterized by expansion of the vessel lumen and local tissue invasion.
• Extrinsic Vascular Compression: Narrowing of the pulmonary arteries caused by external pressure from mediastinal masses, lung tumors, or fibrosing mediastinitis.
• Pulmonary Venous Thrombosis: Blood clots within the pulmonary veins, which can occur post-lung transplantation, post-lobectomy, or in the setting of left atrial masses.
• Anomalous Pulmonary Venous Return: Congenital anomalies where some or all pulmonary veins drain into the systemic venous circulation rather than the left atrium.
• Pleural Effusion: Abnormal accumulation of fluid in the pleural space, which can be quantified and characterized (e.g., free-flowing or loculated).
• Pneumothorax: The presence of free air in the pleural cavity, leading to partial or complete lung collapse, easily visualized on the parenchymal windows of the CT scan.
• Mediastinal Lymphadenopathy: Enlargement of mediastinal and hilar lymph nodes, which may indicate infection, sarcoidosis, lymphoma, or metastatic disease.
• Pericardial Effusion: Excess fluid within the pericardial sac surrounding the heart, which can be a sign of inflammation, infection, or malignancy.
• Thoracic Aortic Aneurysm or Dissection: Concurrent or incidental abnormalities of the thoracic aorta, visualized due to the broad imaging field of the chest.
• Dilatation of the Main Pulmonary Trunk: A main pulmonary artery diameter exceeding 29 mm, which is a strong radiological indicator of pulmonary hypertension.
• Dilatation of the Superior Vena Cava and Azygous Vein: Often secondary to elevated right heart pressures or systemic venous congestion.
• Pneumonic Consolidation: Areas of the lung filled with inflammatory exudate, representing active pneumonia, which can clinically mimic the symptoms of a pulmonary embolism.
• Atelectasis: Areas of collapsed lung tissue, commonly seen adjacent to pleural effusions or secondary to bronchial obstruction.
• Interstitial Lung Disease (ILD): Reticular or nodular patterns, ground-glass opacities, or honeycombing within the lung parenchyma, indicating chronic inflammatory or fibrotic lung disease.
• Emphysema: Destruction of alveolar walls and permanent enlargement of airspaces, visualized as areas of low attenuation without visible walls.
• Bronchiectasis: Permanent, abnormal dilatation of the bronchi, often accompanied by bronchial wall thickening and mucus plugging.
• Active Contrast Extravasation: High-density contrast pooling outside the vascular lumen, indicating active, ongoing hemorrhage secondary to trauma or vascular rupture.
• Congenital Pulmonary Vascular Variants: Normal anatomical variants, such as a single pulmonary artery or anomalous branching patterns, which are important to document for clinical records.

Turnaround Time and Report Access at Dr. Essa Lab

At Dr. Essa Lab, we understand that timely diagnostic results are critical, especially when evaluating potentially life-threatening conditions like pulmonary embolism. For emergency cases or patients referred from emergency departments with suspected acute pulmonary embolism, the scan is prioritized, and preliminary findings are communicated directly to the referring physician immediately after the scan is completed. Standard, non-emergency reports undergo a rigorous double-reading and quality assurance process by our team of board-certified consultant radiologists. The finalized, comprehensive diagnostic report, complete with high-resolution key images, is typically available within 12 to 24 hours of the procedure. Patients and their healthcare providers can conveniently access, view, and download the reports and full DICOM imaging datasets online through the secure Dr. Essa Lab patient portal or mobile application, ensuring seamless continuity of care without the need for unnecessary travel.

CT SCAN ANGIOGRAPHY PULMONARY (DELDC) Findings Overview

The following table provides an overview of the key anatomical structures and parameters evaluated during a CT SCAN ANGIOGRAPHY PULMONARY (DELDC), comparing normal physiological appearances with potential pathological findings:

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Main Pulmonary Trunk	Diameter < 29 mm; uniform contrast opacification; smooth, thin walls.	Dilatation (> 29 mm) indicating pulmonary hypertension; intraluminal filling defects (thrombus); extrinsic compression by mediastinal masses.
Lobar & Segmental Arteries	Symmetric branching; complete, homogeneous contrast enhancement; patent lumens.	Sharp, intraluminal filling defects (acute emboli); eccentric wall-adherent defects (chronic emboli); vessel narrowing or abrupt cutoff.
Right Ventricle / Left Ventricle Ratio	RV/LV diameter ratio < 1.0 on transverse CT slices.	RV/LV ratio ≥ 1.0, indicating right ventricular strain, dysfunction, or overload secondary to pulmonary vascular resistance.
Interventricular Septum	Normal straight or left-convex curvature.	Flattening or paradoxical leftward bowing, indicating severe right ventricular pressure overload.
Lung Parenchyma	Clear lung fields; normal bronchovascular markings; no abnormal consolidations.	Wedge-shaped consolidations (pulmonary infarction); ground-glass opacities; atelectasis; pneumonic consolidation; emphysema.
Pleural Space	No abnormal fluid or air accumulation; thin, barely visible pleura.	Pleural effusion (fluid accumulation); pneumothorax (air accumulation); pleural thickening or nodularity.
Mediastinum & Lymph Nodes	Normal position of mediastinal structures; lymph nodes < 10 mm in short-axis diameter.	Mediastinal shift; lymphadenopathy (enlarged nodes); mediastinal masses; fibrosing mediastinitis.
Pericardial Sac	Thin pericardium; minimal physiological fluid (< 15-50 mL).	Pericardial effusion (excess fluid); pericardial thickening; calcification indicating constrictive pericarditis.

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 Dr. Essa Lab for CT SCAN ANGIOGRAPHY PULMONARY (DELDC)?

• Experienced Healthcare Professionals: Our diagnostic team includes highly experienced, board-certified consultant radiologists and vascular imaging specialists who ensure precise interpretation of complex pulmonary angiograms.
• Patient-Focused Care: We prioritize patient comfort, safety, and clear communication, guiding you through every step of the imaging process to minimize anxiety.
• Quality Diagnostic Services: Dr. Essa Lab utilizes advanced multi-slice CT scanning technology capable of capturing high-resolution, sub-millimeter slices for superior diagnostic accuracy.
• Professional Reporting: We deliver detailed, comprehensive, and highly accurate diagnostic reports, with urgent reporting protocols in place for critical emergency findings.
• Modern Diagnostic Approach: Our imaging protocols incorporate advanced low-dose radiation software (ALARA principle) to ensure patient safety without compromising image quality.
• Comfortable Environment: Our diagnostic centers are designed to provide a clean, hygienic, and comfortable environment, ensuring a pleasant experience for all patients.
• Convenient Locations: With multiple branches conveniently located across Karachi and other major cities, accessing premium diagnostic services is easy and hassle-free.
• Commitment to Accurate Diagnosis: Trusted by thousands of physicians and patients nationwide, Dr. Essa Lab has maintained a legacy of excellence and diagnostic integrity for decades.