Novel Colorimetric Capnography for Confirmation of Thoracostomy Placement: A Potential Paradigm Shift in Tactical and Emergency Trauma Care

By Dr. Ramon Reyes, MD
EMS Solutions International

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Abstract

Needle thoracostomy remains one of the most critical life-saving interventions for tension pneumothorax in both civilian and military trauma. Despite decades of widespread implementation, failure rates remain significant due to incorrect catheter placement, inadequate catheter length, anatomical variability, and the absence of an immediate objective method to confirm pleural entry. A recently published experimental study in the Journal of Special Operations Medicine (JSOM) evaluated an innovative colorimetric capnography device (Capnospot™) capable of providing real-time confirmation of thoracostomy placement. Using a controlled porcine model of tension pneumothorax, investigators demonstrated that colorimetric confirmation occurred significantly faster than ultrasound or radiographic verification. These findings suggest that colorimetric pleural confirmation may improve procedural accuracy, reduce complications, and accelerate definitive management in austere, prehospital, military, and hospital environments. This article reviews the study, analyzes its methodology, discusses its clinical implications, and explores future applications in Tactical Combat Casualty Care (TCCC), Tactical Emergency Casualty Care (TECC), civilian EMS, and emergency medicine.

Keywords: Tension pneumothorax, needle thoracostomy, capnography, thoracic trauma, TCCC, TECC, tactical medicine, emergency medicine, Capnospot.

Original Study Credit

Topper GV, Buonasorte M, Thange L, Miles A, Armento I, Maitha JC, Hunter K, Egodage T. Novel Colorimetric Capnography for Confirmation of Thoracostomy Placement in a Porcine Model of Pneumothorax. Journal of Special Operations Medicine (JSOM). Summer 2026;26(2):15. PMID: 42024813. DOI: 10.55460/J.Spec.Oper.Med.2026.2XXI-YOOH.

Author's Note

This article is an independent scientific review and educational analysis based on the original publication in the Journal of Special Operations Medicine (JSOM). The content has been independently interpreted, expanded, and discussed for educational purposes by Dr. Ramon Reyes (DrRamonReyesMD) and does not reproduce the original article or represent the views of the authors or the publisher.

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Introduction

Tension pneumothorax represents one of the classic reversible causes of traumatic cardiac arrest and remains a leading preventable cause of death following thoracic trauma. Rapid recognition and decompression are fundamental components of trauma management algorithms, including:

• Tactical Combat Casualty Care (TCCC)
• Tactical Emergency Casualty Care (TECC)
• Advanced Trauma Life Support (ATLS)
• Prehospital Trauma Life Support (PHTLS)

Current recommendations emphasize immediate decompression based primarily on clinical findings rather than imaging. However, once the catheter has been inserted, clinicians often have little objective evidence confirming that the pleural cavity has actually been reached.

Incorrect placement may falsely reassure providers while the patient's condition continues to deteriorate.

This diagnostic uncertainty has persisted for decades.

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The Clinical Problem

Several studies have reported failure rates for needle thoracostomy ranging between 20% and over 50%, depending on:

• Chest wall thickness
• Insertion site
• Catheter length
• Provider experience
• Patient body habitus
• Catheter kinking

Even after apparently successful insertion, clinicians frequently rely on indirect indicators such as:

• Audible rush of air
• Subjective decrease in resistance
• Clinical improvement
• Oxygen saturation
• Blood pressure response

Unfortunately, these signs are neither immediate nor consistently reliable.

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The Capnospot™ Concept

Capnospot™ introduces an elegant physiological solution.

Rather than relying on operator perception, the device detects carbon dioxide (CO₂) escaping from the pleural cavity after decompression.

The technology employs a colorimetric CO₂ indicator similar to those used for endotracheal tube confirmation.

Following successful pleural entry, gas exiting the chest passes through the detector.

If CO₂ is present, the indicator changes color almost immediately, providing a rapid visual confirmation of successful placement.

This process requires:

• No power source
• No batteries
• No ultrasound
• No radiography
• No additional monitoring equipment

Its simplicity makes it particularly attractive for combat and austere environments.

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Study Design

The JSOM investigators designed a controlled experimental study using two swine models.

Tension pneumothorax was induced through:

• Transdiaphragmatic CO₂ insufflation

Following induction:

• Needle thoracostomy or
• Pigtail thoracostomy

was performed.

Confirmation methods were compared:

• Capnospot™
• Ultrasound
• Chest radiography

Statistical analysis utilized the Wilcoxon signed-rank test.

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Results

Twenty-four thoracostomies were evaluated.

Needle Thoracostomy

Colorimetric confirmation:

1,030 ms

Ultrasound confirmation:

7,030 ms

P = .004

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Pigtail Thoracostomy

Colorimetric confirmation:

355 ms

Ultrasound:

22,355 ms

Radiography:

9,435 ms

P = .002

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The differences were statistically significant.

More importantly, they were clinically meaningful.

Providers obtained confirmation within approximately one second, rather than waiting several seconds—or even minutes—for imaging.

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Why Speed Matters

In trauma care, every second influences survival.

Delayed recognition of failed decompression may result in:

• Persistent obstructive shock
• Progressive hypoxia
• Cardiac arrest
• Preventable mortality

An objective confirmation obtained almost instantly allows clinicians to:

• Repeat decompression if necessary
• Choose another insertion site
• Proceed rapidly toward definitive chest drainage

without diagnostic uncertainty.

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Advantages Over Existing Methods

Ultrasound

Advantages:

• Highly accurate
• Increasingly available
• Non-invasive

Limitations:

• Operator dependent
• Equipment required
• Image acquisition may be difficult
• Limited during combat
• Difficult in helicopters or confined environments

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Chest X-ray

Advantages:

• Standard hospital confirmation

Limitations:

• Delayed
• Requires imaging equipment
• Not available prehospital
• Unsuitable for tactical environments

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Colorimetric Confirmation

Advantages include:

• Immediate feedback
• Portable
• Lightweight
• Disposable
• Objective
• No electricity
• Minimal training

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Potential Tactical Applications

Capnospot™ may prove especially valuable during:

• Battlefield casualty care
• Tactical EMS
• Law enforcement operations
• Air medical transport
• Austere humanitarian missions
• Maritime operations
• Wilderness medicine
• Disaster response

These environments frequently lack imaging resources while demanding rapid intervention.

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Potential Civilian Applications

Beyond military medicine, this technology may improve care in:

• Emergency departments
• Ground EMS
• Critical care transport
• Rural hospitals
• Trauma centers
• Emergency physicians
• Flight paramedics
• Retrieval medicine

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Limitations of the Study

Although promising, several limitations deserve attention.

The investigation utilized:

• Porcine models rather than human subjects.

Artificially induced pneumothorax may not perfectly reproduce:

• Penetrating trauma
• Blast injuries
• Multiple rib fractures
• Hemothorax
• Combined thoracic injuries

Additionally:

• Sample size was relatively small.
• Human validation studies remain necessary.
• Performance during massive hemothorax remains unknown.
• False-positive and false-negative rates require further investigation.
• Cost-effectiveness has not yet been established.

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Future Research

Future investigations should evaluate:

• Human trauma patients
• Military casualties
• Civilian trauma systems
• Pediatric populations
• Obese patients
• Helicopter EMS
• Damage Control Resuscitation
• Integration into TCCC protocols
• Comparison with finger thoracostomy
• Long-term clinical outcomes

Randomized prospective trials will determine whether this technology reduces mortality and procedural failure rates.

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Implications for Tactical Medicine

If validated clinically, colorimetric confirmation could become one of the most important innovations in thoracic trauma since the widespread adoption of needle decompression itself.

Its simplicity aligns perfectly with modern tactical medicine principles:

• Rapid intervention
• Objective confirmation
• Minimal equipment
• Low cognitive load
• High portability
• Scalability across multiple care environments

For combat medics, special operations personnel, paramedics, emergency physicians, and trauma surgeons, this technology has the potential to substantially improve procedural confidence while reducing preventable deaths.

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Conclusion

The JSOM Summer 2026 study introduces a compelling innovation in thoracic trauma management. By providing rapid visual confirmation of pleural entry through colorimetric capnography, Capnospot™ addresses one of the longstanding limitations of needle thoracostomy: the inability to objectively verify successful decompression at the moment of intervention.

Although further human clinical trials are essential before widespread adoption, the preliminary evidence suggests that this device could significantly enhance procedural accuracy and decision-making across military, prehospital, and hospital settings. If future studies confirm these findings, colorimetric thoracostomy confirmation may become an important addition to contemporary trauma algorithms and tactical casualty care.

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References

1. Topper GV, Buonasorte M, Thange L, et al. Novel Colorimetric Capnography for Confirmation of Thoracostomy Placement in a Porcine Model of Pneumothorax. Journal of Special Operations Medicine. 2026;26(2):15. DOI: 10.55460/J.Spec.Oper.Med.2026.2XXI-YOOH

2. Butler FK, et al. Tactical Combat Casualty Care Guidelines. Committee on Tactical Combat Casualty Care (CoTCCC), 2026.

3. American College of Surgeons. Advanced Trauma Life Support (ATLS®) Student Course Manual. 11th Edition.

4. National Association of Emergency Medical Technicians. Prehospital Trauma Life Support (PHTLS). 10th Edition.

5. Joint Trauma System Clinical Practice Guidelines. Management of Thoracic Trauma. U.S. Department of Defense.