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Complications associated with pre-hospital open thoracostomies: a rapid review
Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine volume 29, Article number: 166 (2021)
Open thoracostomies have become the standard of care in pre-hospital critical care in patients with chest injuries receiving positive pressure ventilation. The procedure has embedded itself as a rapid method to decompress air or fluid in the chest cavity since its original description in 1995, with a complication rate equal to or better than the out-of-hospital insertion of indwelling pleural catheters. A literature review was performed to explore potential negative implications of open thoracostomies and discuss its role in mechanically ventilated patients without clinical features of pneumothorax.
A rapid review of key healthcare databases showed a significant rate of complications associated with pre-hospital open thoracostomies. Of 352 thoracostomies included in the final analysis, 10.6% (n = 38) led to complications of which most were related to operator error or infection (n = 26). Pneumothoraces were missed in 2.2% (n = 8) of all cases.
There is an appreciable complication rate associated with pre-hospital open thoracostomy. Based on a risk/benefit decision for individual patients, it may be appropriate to withhold intervention in the absence of clinical features, but consideration must be given to the environment where the patient will be monitored during care and transfer. Chest ultrasound can be an effective assessment adjunct to rule in pneumothorax, and may have a role in mitigating the rate of missed cases.
In addition to the oesophagus and lymphatic vessels, the thoracic cavity contains several life-sustaining structures including the heart and great vessels, airways, and lungs . Injury to any of these can place a person at immediate threat of severe disability or death, making chest trauma a well-acquainted adversary of emergency pre-hospital care providers. Even though significant chest injuries are associated with adverse outcomes, they can manifest late and have proven difficult to identify on clinical examination [2, 3]. Leech et al.  list closed tension pneumothorax (T-PTX) as the most common severe pathology in major chest trauma (1 in 250), a condition where air is increasingly introduced to the pleural space without an ability to escape . This can develop over a matter of minutes or several hours , and occurs when a conduit is created by a rupture of lung tissue or an open wound through the chest wall, or a combination of the two. Increasing volume of air in one side of the pleural cavity interferes with pleural adhesion and disrupts the negative-pressure mechanism normal ventilation relies upon. An ever-increasing pleural volume compresses the ipsilateral lung further inhibiting alveolar ventilation area, and rising pressure shifts structures such as the vena cavae contralaterally which reduces cardiac preload and eventually causes circulatory collapse. Significant haemorrhage into the pleural cavity can present a similar mass effect on the lung and mediastinal organs, but less often creates tension and introduces significant intravascular volume depletion as a co-pathology [4, 6].
Immediate mitigation of large T-PTX involves the release of air from the pleural cavity. In its simplest form this is done by inserting an open intravenous cannula through the chest wall and can be performed in the spontaneously breathing patient to alleviate high intrathoracic pressures. This is a safe intervention when applied in the correct circumstances  but has also been highlighted as often inadequate by Leigh-Smith & Harris  in 2004 and in several studies since [8, 9].
Traditionally, definitive treatment has been tube thoracostomies which involve performing a thoracic incision and placing an indwelling catheter attached to a one-way drainage system, to prevent air from re-entering the chest cavity . More recently, Deakin et al.  described an open thoracostomy technique in the positive pressure-ventilated patient where altered ventilation physiology would allow an open conduit between the chest and environment without respiratory failure. Several authors have emphasised the success of this technique [12,13,14], which now is considered standard treatment for patients in traumatic cardiac arrest, or those who are positive pressure-ventilated with significant pneumo- or haemothorax with ventilatory compromise, where the skill is available [4, 15,16,17]. A recent systematic review by Sharrock et al.  sought to compare the safety and efficacy of needle- and open thoracostomies performed by non-physicians but was unable to establish one as definitively superior.
Additional file 1 contains an illustration of finger thoracostomies
Simple thoracostomy: (a) The ‘triangle of safety’ is identified by the centre of the axilla, the lateral aspect of musculus latissimus dorsi, and the lateral pectoralis major at the line of the nipple, with the arm fully abducted. (b) A bold incision is made through subcutaneous tissue in the fifth intercostal space at the anterior axillary line. (c) Muscle tissue is then dissected using a blunt instrument e.g., a set of arterial forceps, creating a canal to the parietal pleura which is then breached for access to the pleural cavity. A hiss of air, or ooze of blood or pus may present at this point, depending on underlying pathology. (d) The pleural cavity is explored using a finger, assessing for the position of the lung and any adhesions. The resulting canal is left open to allow air or fluid to escape and prevent compression of the lung. (Illustration by Megan Worsfold).
National guidance only describes the application of pre-hospital open thoracostomies in patients where there is a clinical suspicion of tension-pathology [4, 16]. However experience has shown this practice is implemented by some as a preventative measure, where a pneumothorax (PTX) may or may not be present, to avoid complications e.g., unrecognised T-PTX during transport. Decompression of significant PTX regardless of manifested tension has been promoted in secondary literature . However, this concerns an interfacility setting with the ability to confirm the diagnosis with a chest x-ray, but the authors do not discuss what to do when there is an absence of clinical indicators. The Occult Pneumothoraces in Critical Care (OPTICC) trial  suggests it may be appropriate to observe patients receiving positive pressure ventilation (PPV) without overt signs of PTX, but this was an in-hospital study where close monitoring and immediate action was readily available. Pre-hospital critical care is typically delivered with a clinician-to-patient ratio of 2:1 with appropriate monitoring and the ability to decompress a developing tension as it presents. However environmental considerations such as vibration, dim lighting and noise are a few examples of potential barriers to identifying rapid changes in clinical condition  in the pre-hospital setting. A literature review was performed to explore potential negative implications of open thoracostomies and discuss its role in mechanically ventilated patients without clinical features of pneumothorax.
A review across several databases was performed to assess the rate of complications in pre-hospital open thoracostomies. Only patients receiving positive pressure ventilation were included as normal respiratory physiology precludes the need for open thoracostomies in the spontaneously breathing patient [4, 16]. Only cases where at least one thoracostomy was performed pre-hospital was included, as this is the environment of practice the question relates to. The patient with chest injuries is emphasised, but papers discussing PTX from medical causes were also included if pre-hospital thoracostomy was a treatment strategy used.
Open thoracostomy is here defined as a surgical procedure where sharp dissection is used to break the skin of the chest in the 4-5th intercostal space in the anterior axillary line, following which blunt dissection and a finger-sweep creates a conduit between the pleura and the environment but without placing a chest tube. This can include cases where the procedure was performed without a clear clinical need, based on signs or symptoms of significant chest trauma to both sides of the chest or deranged physiology; or where only the side(s) of the chest that were injured were opened. Indwelling chest drains were excluded from the review if placed in the pre-hospital environment, as this procedure carries other risks of complication and would be rare in current pre-hospital practice [10, 21].
Outcomes measured were defined as:
rate of iatrogenic injury to other structures; bleeding including iatrogenic haemothorax; loss of sensation; chronic neuralgia
wound infection or empyema
missed contralateral pathology requiring decompression
delayed healing defined as time dependent on thoracic drainage, ventilation, or surgical wound care (Table 1).
The PROSPERO and Cochrane Reviews databases were interrogated for any reviews answering the clinical question [22, 23]. No relevant articles were found in Cochrane CENTRAL database for clinical trials. Two related best evidence topics by Pritchard [12, 24] relating to patients with chest injuries and in traumatic cardiac arrest respectively were identified in the BestBETs database , but differs from this review as it excluded paediatric patients and included papers where indwelling tubes were inserted pre-hospital and were therefore excluded.
Searchable terms were developed from keywords discovered during scoping searches. Terms were connected using truncation and wildcards, and the “AND” or “OR” Boolean logic-operators: pre*hospital OR out-of-hospital AND; thoracostom*; AND iatrogeni* OR complication* OR infection OR empy?ema OR delay*. Subject headings or MeSH-terms were used across the Cochrane and Ovid interfaces, identified by using the interfaces’ integral heading-browsers. Terms related to age and ventilation status were withheld from the search, and excluded at screening if not agreeing with selection criteria to ensure a sufficient sensitivity and search yield.
Searches were performed across titles and abstracts in Scopus (Elsevier), CINAHL (HDAS), Medline (Ovid SP) and Embase (Ovid SP) on 6th March 2021 (Table 2). Papers were limited to those written in English and published between 2000 to 2021. Results were uploaded to Endnote X9 (3.3, Cite While You Write) referencing software and deduplicated, before manual screening of abstracts and full texts against selection criteria.
Additional file 2 contains a PRISMA flowchart demonstrating the search and screen process
Data collection and analysis
Qualitative analysis of each paper was performed (Additional file 3: Table 1) and rated using the OCEBM Levels of Evidence  and GRADE criteria . Data pertaining to complications were extracted, and common types of iatrogenesis or complications were clustered. Incidence of complications was calculated and is presented as counts and percentages of all complications and all thoracostomies. One paper was excluded from quantitative analysis as it did not follow patients beyond handover to the emergency department .
A total of five papers met the selection criteria after full text screening, all pertaining to procedures performed pre-hospital but only four describing outcomes beyond hospital admission [13, 14, 28,29,30]. The papers included a total of 350 patients receiving 427 thoracostomies (excluding traumatic cardiac arrest), of which 386 (90.4%) were in the pre-hospital environment and 41 (9.6%) were in hospital. Two-hundred-and-twenty-four patients (64%) were followed up past admission with a mortality rate of 28.5% (n = 64).
Additional file 3 contains a landscape table of included studies with analysis
Indications and procedure
Open thoracostomies are universally indicated in the presence of a large PTX in patients receiving PPV, as this is associated with an increased risk of developing tension pathology [31, 32]. Massarutti et al.  defined a clinical diagnosis of simple PTX as decreased breath sounds, subcutaneous emphysema, serial rib fractures with chest wall instability, flail chest or penetrating chest wounds. Aylwin et al.  applied similar criteria but added the presence of a unilateral wheeze to the list of clinical signs and added a wider range of indications including undifferentiated hypotension, or unilateral signs of a PTX in the presence of hypoxia or hypotension. Aylwin et al.  used T-PTX as the indication for the procedure defined as hypoxia, hypotension, absent breath sounds and tracheal shift. Conversely, Massarutti et al.  defined T-PTX based on the result of the procedure, as determined by an apparent hiss of air and/or rapidly stabilising vital signs following the procedure. Chesters et al. , Hannon et al.  and Quinn et al.  did not elaborate on their clinical indications but included chest injuries presenting a high risk of PTX, or unexplained hypoxia or hypotension in all patients receiving PPV. All papers agreed on finger thoracostomies as appropriate routine measures in traumatic cardiac arrest, and described the procedure uniformly, most referring to the initial description of the technique by Deakin et al.  in 1995.
Of the 352 procedures followed up past admission, 10.6% (n = 38) were associated with complications and of these 7.3% (n = 26) were caused by procedural error and subsequent injury, infection, or treatment failure, while missed or recurring PTX accounted for 3.4% (n = 12).
Of the 38 complications identified in this review (Table 3), iatrogenic injury including injury to underlying organs, unintended bleeding, induced haemothorax or unnecessarily created thoracostomies was most common (28.9%, n = 11). Failure to decompress underlying PTX despite attempt and misplaced incisions accounted for five (13.1%) and eight cases (21%) respectively, and missed PTX and recurrent tension accounted for eight (21%) and four (10.6%) cases, respectively. Only two cases (5.2%) of post-procedure infection were identified on follow-up, but of note, the use of prophylactic antibiotics is not discussed throughout the papers and can therefore not be assessed reliably. Excluded from these data is the study by Chesters et al.  which did not include any follow-up beyond the pre-hospital phase.
Pre-hospital open thoracostomies have shown to be effective at relieving T-PTX and retain patency, avoiding the time-consumption and complications associated with inserting a drainage tube . Findings from this review support this with only 1.1% of PTX re-tensioning post-procedure, but there is an apparent paucity of studies assessing patient-focused outcomes from thoracostomies with only three of the five identified papers attempting follow-up beyond pre-hospital or emergency department care [14, 28, 30].
Careful balancing of benefit and harm, in line with the core principles of biomedical ethics  is required with any invasive procedure. Open thoracostomies are not benign with an overall procedural complication rate of 7.4% (excluding missed and recurrent PTX) and are associated with other complications such as long-term pain and cosmetic implications [10, 34], although these were not discussed in the papers in this review.
Finger thoracostomies in trauma are appropriate in circumstances where the patient has suffered chest injuries and is in cardiac arrest [15, 17]. It is also an established intervention in tension pneumothorax [15, 16], but the criteria for diagnosis are inconsistent between the papers in this review [13, 14, 28,29,30]. Unilateral chest pathology following trauma with features of reduced or absent air entry, with persistent or worsening hypoxia despite other measures, and/or features of shock or high ventilator airway pressures, should prompt consideration of a tension pathology requiring decompression [9, 16, 31]. However, there are many other potential causes for hypoxia, shock, and high airway pressures in the positive pressure ventilated trauma patient. Therefore, the decision to perform thoracostomy could be helped by using a checklist to ensure other less invasive causes are ruled out, before committing the patient to a surgical procedure .
Pre-hospital practice has evolved tremendously since Deakin et al.  first described the open thoracostomy method with the recent introduction of point-of-care ultrasound (POCUS) . The technique is increasingly popular and advocated as an adjunctive decision-making tool in chest trauma . POCUS has demonstrated high positive and negative predictive values, but due to significant inter-rater differences it is currently regarded too unreliable in completely ruling out pathology [37, 38]. Chest wall surgical emphysema in particular significantly reduces the utility of POCUS. That said, services that can ensure adequate training and competence should consider incorporating POCUS assessment into their guidelines. Further research on the utility of POCUS in pre-hospital chest injury management may help define those patient groups most likely to benefit from pre-hospital finger throactostomy.
This review has several limitations. All the included studies have used purposive sampling introducing potential selection bias, in this case patients requiring pre-hospital thoracostomies. This patient group typically suffers other major injuries associated with high morbidity and mortality and could confound outcomes, which cannot be adjusted for effectively with retrospective study designs and no comparison groups. Sample sizes are small and heterogenous; additionally, several of the papers demonstrated a high loss to follow-up with a mean of 71.4% (n = 64/224) of patients followed up to survival [14, 28,29,30]. This attrition bias could significantly affect the outcomes observed in the sample population hiding procedural complications as contributing to mortality in these patients. The retrospective nature of three of the studies [13, 28, 29] raises the possibility of reporting bias from inadequate or inaccurate notetaking. Conversely, prospective studies could encourage clinicians to create notes portraying more favourable outcomes than they otherwise would, knowing their practice is being assessed. Aylwin et al.  and Quinn et al.  included thoracostomies performed in the emergency department in their data which reduces the generalisability of these results to pre-hospital practice. The study by Hannon et al.  also included follow-up data on three cases who initially were in cardiac arrest which is not directly applicable to the selection criteria for this review.
Pre-hospital thoracostomies are associated with a 10.6% complication rate based on the evidence identified in this review, most of which are due to operator error as opposed to unresolved or missed pathology. An open thoracostomy technique is likely to be as safe or safer than tube thoracostomies and remains the preferred option unless a tube is indicated for other reasons. Occult pneumothoraces can develop tension with subsequent shock or cardiac arrest, but it may be appropriate to withhold intervention in the absence of clinical features depending on the situation rather than ‘empirical’ thoracostomy. Clinicians should consider the environment where the patient will be monitored during care and transfer, and chest ultrasound can be used as an adjunct to assessment. Positive findings of pneumothorax on ultrasound may support a decision to decompress, but a normal ultrasound cannot exclude pathology and continuous patient monitoring remains pertinent. Existing evidence is too weak to establish definitive data on complications following pre-hospital thoracostomies, but this could be improved with prospective observational research with adequate follow-up beyond hospital admission.
Availability of data and materials
All data generated or analysed during this study are included in this published article through (1) tables included in the paper, and (2) the published articles included in the review.
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The corresponding author would like to acknowledge the Emergency Medical Retrieval Service for the support to complete this work as part of a postgraduate degree and towards publication, and the University of Stirling for funding the publication of the article. Thank you to Megan Worsfold for illustrating the thoracostomy procedure and allowing its use towards this publication.
Article processing fees funded by the University of Stirling.
None of the authors have any relevant competing interests to disclose.
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Additional file 1. Figure 1
: Illustration of an open thoracostomy.
Additional file 2. Figure 2
: PRISMA flowchart of the search and screen process.
Additional file 3. Table 1
: Landscape table of included studies with summary of analysis.
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Mohrsen, S., McMahon, N., Corfield, A. et al. Complications associated with pre-hospital open thoracostomies: a rapid review. Scand J Trauma Resusc Emerg Med 29, 166 (2021). https://doi.org/10.1186/s13049-021-00976-1
- Emergency medical services
- Critical care
- Thoracic injuries
- Intraoperative complications