Thoracic Imaging

What Imaging Is Best After Placing a Support Device in an ICU Patient?

May 21, 2026 · Pouyan Golshani, MD, Interventional Radiologist

It’s 3 AM in the intensive care unit, and you’ve just successfully placed a right internal jugular central venous catheter in a patient with septic shock. Before you can start the vasopressors, you need to confirm the catheter’s tip is in the correct position and that you haven’t caused a complication like a pneumothorax. The patient is intubated and too unstable to move. Your next decision is which imaging study to order from the bedside. This article provides a focused workflow for this exact scenario, guiding you through the differential diagnosis, imaging rationale, and downstream actions. Based on the American College of Radiology (ACR) Appropriateness Criteria, a portable chest radiograph is rated Usually appropriate as the initial imaging study.

Who Fits This Clinical Scenario?

This guidance applies specifically to adult or pediatric patients in an intensive care unit (ICU) who require initial imaging immediately following the placement of a thoracic support device. The primary goal of the imaging is to verify device position and rule out acute procedural complications.

Inclusion Criteria:

Patient is in an ICU setting.
A support device has just been placed. This includes, but is not limited to:
Endotracheal tubes (ETT)
Central venous catheters (CVCs)
Nasogastric (NG) or orogastric (OG) tubes
Chest tubes or mediastinal drains
Intra-aortic balloon pumps (IABP)
Pacemaker or implantable cardioverter-defibrillator (ICD) leads
Extracorporeal membrane oxygenation (ECMO) cannulae

Exclusion Criteria (These route to different ACR guidelines):

Clinically Worsening Patient: If the patient develops acute hypoxia, hypotension, or other signs of decompensation after the procedure, this represents a change in clinical status and falls under the “Intensive care unit patient with clinically worsening condition” scenario, which may warrant a different imaging approach.
Stable Patient, No New Device: This guidance does not apply to routine daily imaging for stable ICU patients. That scenario is covered separately under “Stable intensive care unit patient. No change in clinical status.”
Post-Device Removal: Imaging after the removal of a chest or mediastinal tube is a distinct clinical question with its own recommendations.

What Diagnoses Are You Working Up in This Scenario?

When ordering imaging after device placement, you are primarily investigating two categories of potential issues: device malposition and iatrogenic complications. A secondary benefit is the reassessment of the patient’s baseline cardiopulmonary status.

Device Malposition
This is the most common and immediate concern. The ideal position is specific to each device, and malposition can lead to inefficacy or harm. Examples include an endotracheal tube advanced into the right mainstem bronchus, causing left lung collapse; a central venous catheter tip placed too deep in the right atrium, risking arrhythmia; or a nasogastric tube coiled in the esophagus or, more dangerously, passed into the tracheobronchial tree.

Iatrogenic Complications
Procedures in the chest carry inherent risks. The most critical complication to identify promptly is a pneumothorax, particularly after subclavian or internal jugular venous access. Other potential complications include hemothorax from an arterial puncture, mediastinal hematoma, or perforation of a vessel or cardiac chamber. While less common, these are life-threatening events that initial imaging aims to detect.

Baseline Cardiopulmonary Assessment
The post-procedure image also serves as a new baseline. It allows for the evaluation of underlying or evolving conditions like pulmonary edema, pleural effusions, atelectasis, or pneumonia. Comparing this image to subsequent studies is crucial for tracking the patient’s clinical course in the ICU.

Why Is a Portable Chest Radiograph the Recommended Study for This Presentation?

The ACR panel designates a portable chest radiograph as Usually appropriate for confirming support device placement because it offers the best balance of diagnostic utility, accessibility, speed, and safety in the critical care setting.

A portable anteroposterior (AP) chest radiograph provides a comprehensive view of the lungs, mediastinum, and relevant osseous structures. It is highly effective for visualizing the entire course and final tip position of most radiopaque lines and tubes relative to key anatomical landmarks like the carina, aortic knob, and cavoatrial junction. This capability is essential for confirming correct placement of endotracheal tubes, central lines, and chest tubes.

Simultaneously, the radiograph is sensitive for detecting significant, clinically relevant complications. A moderate to large pneumothorax, a large pleural effusion (hemothorax), or widespread pulmonary edema are readily apparent. The radiation dose is extremely low (adult relative radiation level ☢ <0.1 mSv), which is a critical consideration for ICU patients who may require multiple imaging studies during their stay.

Why Are Other Studies Rated Lower?

US chest: This is rated May be appropriate (Disagreement). Bedside ultrasound is exceptionally sensitive for detecting pneumothorax (by assessing for lung sliding) and can be used to guide the placement of lines in real-time. However, it is not the primary modality for confirming the final tip position of a central line within the mediastinum or an endotracheal tube relative to the carina. Its utility is focused and operator-dependent, making it a valuable adjunct but not a comprehensive replacement for the global view provided by a radiograph in this specific context. It has the advantage of using no ionizing radiation (O 0 mSv).

For a patient who has just had a device placed, the portable chest radiograph remains the first-line study to answer the two most important questions: “Is the line in the right place?” and “Did the procedure cause a major complication?”

Once you’ve decided on this study, our protocol guide covers the essential technique, quality checks, and interpretation principles. You can find it here: Chest X-Ray Portable.

What’s Next After a Portable Chest Radiograph? Downstream Workflow

The radiograph results will directly guide your immediate clinical actions. The workflow branches based on whether the findings are normal, show device malposition, or reveal a procedural complication.

If the study is normal: The device is confirmed to be in a satisfactory position with no acute complications. You can proceed with using the device (e.g., start infusions, initiate tube feeds, connect to the ventilator with current settings). No further imaging is indicated unless the patient’s clinical status changes.

If the device is malpositioned: The next step is immediate adjustment.
Endotracheal Tube: If too deep (typically in the right mainstem bronchus), withdraw it a few centimeters and repeat the radiograph to confirm placement above the carina.
Central Venous Catheter: If the tip is in the right atrium or ventricle, withdraw it to the cavoatrial junction and repeat imaging. If it’s in an incorrect vessel (e.g., internal thoracic vein), it may need to be repositioned or replaced.
Nasogastric Tube: If it’s in the bronchus, it must be removed immediately. If coiled in the esophagus, it should be advanced or repositioned.

If a complication is identified:
Pneumothorax: A small, asymptomatic pneumothorax may be observed with serial imaging. A large or symptomatic pneumothorax requires urgent intervention, typically with chest tube placement. A post-placement radiograph is then required to confirm tube position and lung re-expansion.
Hemothorax/Large Effusion: This may require drainage via a chest tube and investigation for the source of bleeding. If there is concern for active arterial bleeding, this may trigger an escalation to CT angiography.

Pitfalls to Avoid (and When to Get Help)

Even with a routine study, several pitfalls can lead to misinterpretation or delayed care in the ICU.

Accepting a Suboptimal Image: A poorly rotated, under-penetrated, or expiratory film can obscure a small pneumothorax or make line tip localization impossible. Always assess image quality before making a final interpretation.
Fixating on the Device: Remember to systematically evaluate the entire image. Don’t focus so intently on the new catheter that you miss a new lobar consolidation or other interval change.
Misidentifying Anatomic Landmarks: Be certain of the location of the carina, cavoatrial junction, and diaphragm. Using these landmarks consistently is key to correctly assessing device placement.
Delaying Action on Critical Findings: If an NG tube is in the lung or an ETT is causing unilateral lung collapse, this requires immediate action, not waiting for a formal report.

Escalation: If the portable radiograph is equivocal or if there is a high clinical suspicion for a complication not well-visualized (e.g., mediastinal hematoma, vessel perforation), escalate immediately to a non-contrast or contrast-enhanced chest CT scan.

Frequently Asked Questions

Is a chest radiograph needed after every nasogastric (NG) tube placement?

Yes, in the ICU setting, radiographic confirmation is the standard of care before initiating tube feeds. This is especially critical in intubated, sedated, or obtunded patients who cannot report respiratory distress, as inadvertent placement into the tracheobronchial tree can be catastrophic if feeds are started.

Can ultrasound completely replace radiography for confirming central line placement?

Not for confirming the final tip position. Bedside ultrasound is excellent for ruling out a procedural pneumothorax and can be used to confirm the catheter is within the target vein in the neck. However, it cannot reliably visualize the catheter tip’s location relative to the cavoatrial junction deep within the mediastinum. Therefore, a chest radiograph remains the standard for final tip confirmation.

How soon after placing an endotracheal tube should the radiograph be obtained?

The radiograph should be obtained promptly after intubation and initial confirmation by clinical signs (auscultation, end-tidal CO2). This ensures the tube is not in a mainstem bronchus, which would compromise ventilation to one lung. The ideal position is typically 3-5 cm above the carina.

What if the patient is too unstable to get a good quality inspiratory film?

In the ICU, many portable radiographs are suboptimal. Even on an expiratory film, you can still assess for major malposition or a large pneumothorax. If a small pneumothorax is suspected but not clearly seen, a repeat film or a bedside lung ultrasound can be helpful. If the line tip is obscured, you may need to rely on other methods (like pressure transduction) or consider a different imaging modality if placement is critical and uncertain.

Does this guidance apply to peripherally inserted central catheters (PICC lines)?

Yes, this guidance applies to any centrally-terminating catheter, including PICC lines. A chest radiograph is required to confirm the tip of the PICC line is located at the cavoatrial junction before it is used for infusion of vesicants or for central venous pressure monitoring.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 26, 2026