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Resuscitative thoracotomy in blunt traumatic cardiac arrest

Many thanks to EHAAT for publishing their case series showing consistent delivery of resuscitative thoracotomy (RT) in a wide range of clinical scenarios [1]. Although sadly none of the patients survived, our understanding of traumatic cardiac arrest has been improved by the study. The majority (26/44) of RTs were performed in blunt trauma—a less well recognised indication for RT, with a small number of single case reports of survivors and multiple case series from around the world reporting dismal outcomes [2]. As a result, if there is a survival benefit of RT in blunt traumatic cardiac arrest, the NNT may be more than the 26 RT’s performed. The indications for blunt thoracotomy are poorly characterised as shown by a study from Nevins and colleagues, which showed great variation in standard operating procedures across UK pre-hospital services [2].

European Resuscitation Council (ERC) guidelines [3] recommend RT for relieving tamponade and aortic control in subdiaphragmatic haemorrhage in the context of appropriate Expertise, Equipment, Environment and Elapsed time (Fig. 1). In actively deteriorating trauma patients, particularly in the rural setting, there are limited treatment options for active non-compressible haemorrhage. An important finding from this study is that 15% of patients in blunt traumatic cardiac arrest had evidence of cardiac tamponade on RT, which may represent a reversible cause in some cases – however none of these patients survived and will have suffered more complex injury patterns than isolated tamponade.

Fig. 1
figure 1

European Resuscitation Council guidelines on Traumatic Cardiac Arrest

The Royal College of Emergency Medicine (RCEM) are more pessimistic, stating that immediate surgical support and an onwards chain of survival are required following RT—otherwise the procedure is likely to be futile [4]. A challenge from this case series is geographical location of the incidents, with long transfer times resulting in only 6 of the 44 patients being stable enough for primary transfer to the major trauma centre. The “Trauma Emergency Thoractomy for Resuscitation In Shock” (TETRIS) study is an ongoing national audit on UK RT practice and may help identify which patients (if any) may benefit. Positive prognostic factors are likely to include on-scene expertise at the time of cardiac arrest with immediate RT; cardiac tamponade rather than exsanguinating haemorrhage; concurrent damage control resuscitation including balanced transfusion and temperature management; short transfer time to the Major Trauma Centre with early targeted surgical intervention; otherwise survivable injuries and absence of traumatic brain injury.

Authors’ Response

We are grateful to Stretch and Gomez for their feedback. We agree that the timeline for RT remains a challenge, particularly in our environment. We further agree about the current state of the literature landscape and hence why we wanted to share our findings. The point relating to Number Needed to Treat (NNT) is well made and we would go further in agreement by stating a survival rate of 1.4% would yield an NNT of 71—approximately three times the number in our blunt RT series [5]. In short, you have to kiss a lot of frogs!

Other systems have demonstrated that survival is possible, even in the face of long transfer times where blunt force trauma has resulted in cardiac tamponade [6]. It is perhaps a quirk of the rarity of such procedures which brings difficulty in studying or publishing such success. We wholeheartedly commend, support and contribute to the prospective trainee-led TETRIS STUDY, which is now recruiting.

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Abbreviations

EHAAT:

Essex and herts air ambulance trust (Title)

RT:

Resuscitative thoracotomy

ERC:

European resuscitation council

RCEM:

The royal college of emergency medicine

TETRIS:

Trauma emergency thoractomy for resuscitation in shock

References

  1. Almond P, Morton S, OMeara M, et al. A 6-year case series of resuscitative thoracotomies performed by a helicopter emergency medical service in a mixed urban and rural area with a comparison of blunt versus penetrating trauma. Scand J Trauma Resusc Emerg Med 2022;30(8): 1-11

  2. Nevins EJ, Moori PL, Smith-Williams J, et al. Should pre-hospital resuscitative thoracotomy be reserved only for penetrating chest trauma? Eur J Trauma Emerg Surg. 2018;44:811–8.

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Stretch, B., Gomez, D. Resuscitative thoracotomy in blunt traumatic cardiac arrest. Scand J Trauma Resusc Emerg Med 30, 30 (2022). https://doi.org/10.1186/s13049-022-01010-8

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