Pre-hospital chest escharotomy

Two cases are described in Pre-hospital Emergency Care of severely burned patients who were impossible to adequately ventilate after tracheal intubation until they underwent escharotomy by a pre-hospital physician.
The review that follows reminds us of some intersting escharotomy facts:

  • circumferential extremity burns can cause limb ischaemia
  • abdominal burns can cause elevated intra-abdominal pressure and ischemic bowel
  • neck burns can cause tracheal and jugular venous compression
  • chest burns can cause respiratory compromise
  • one previous study showed that chest and abdominal escharotomies significantly decreased intra-abdominal pressure, retention of carbon dioxide, and central venous and inferior vena caval pressures while significantly increasing serum oxygen concentration and systolic blood pressure.
  • escharotomies may be performed on multiple body parts, including the extremities, the digits, the chest, the abdomen, the neck, and the penis
  • neck escharotomy is a relatively simple procedure that involves an incision of the skin eschar longitudinally in the anterior midline from the chin to the sternal notch
  • although different ways of doing chest escharotomies have been described, in the two reported cases in this article the procedure only involved longitudinal incisions, with good immediate effect.

Of note, neither of the physicians concerned had seen or done an escharotomy before. I’m adding this to my list of life-saving surgical interventions that are technically straightforward to perform, cannot always wait for another specialist to do, and happen too rarely to train for in the traditional way (ie being taught on a patient under supervision prior to the first time you do one).

Out-of-hospital chest escharotomy: a case series and procedure review
Prehosp Emerg Care. 2010 Jul-Sep;14(3):349-54

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Military pre-hospital thoracotomy

Military doctors in Afghanistan reviewed their experience of thoracotomy done within 24 hours of admission to their hospital. The ballistic nature of thoracic penetrating trauma (mainly Afghan civilians without body armour) differs from the typical knife-wound related injury seen in survivors of thoracotomy reported in the pre-hospital literature.

Six of the patients presented in cardiac arrest – four PEA and two asystole. One of the PEA patients survived; this patient had sustained a thoracoabdominal GSW and had arrested 8 minutes from hospital. Following emergency thoracotomy, aortic control, and concomitant massive transfusion, return of spontaneous circulation (ROSC) was achieved and damage control surgery undertaken in both chest and abdomen.

The two patients in asystole had sustained substantial pulmonary and hilar injuries, and ROSC was never achieved. The patients in PEA all had arrested as a consequence of hypovolaemia from solid intra-abdominal visceral haemorrhage. All patients in PEA had ROSC achieved, albeit temporarily.

Following thoracotomy, patients required surgical manoeuvres such as pulmonary hilar clamping, packing and temporary aortic occlusion; hypovolaemia was the leading underlying cause of the cardiac arrest. These factors lead the authors to conclude that although isolated cardiac wounds do feature in war, they are unusual and the injury pattern of casualties in conflict zones are often complex and multifactorial.

Is pre-hospital thoracotomy necessary in the military environment?
Injury. 2010 Jul;41(7):1008-12

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Infant CPR: two thumbs even when alone

Infant CPR guidelines recommend two-finger chest compressions with a lone rescuer and two-thumb with two rescuers. Two-thumb provides better chest compression but is perceived to be associated with increased ventilation hands-off time. A manikin study revealed more effective compressions with the two-thumb technique with only four fewer compressions per minute compared with two-fingers.

Two-thumb technique is superior to two-finger technique during lone rescuer infant manikin CPR
Resuscitation. 2010 Jun;81(6):712-7

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Surviving avalanche burial

Avalanche burial has a high mortality and yet in some cases there have been some amazing saves despite prolonged cardiac arrest. An international working group undertook a systematic review to examine 4 critical prognostic factors for burial victims in cardiac arrest. You have a better chance of surviving a prolonged burial if you have a patent airway and a pocket of air (even a very small one), are hypothermic, and preferably not hyperkalaemic.

Prognostic factors in avalanche resuscitation: A systematic review
Resuscitation. 2010 Jun;81(6):645-52

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Pre-hospital RSI

Physicians from HEMS London document their experience of 400 pre-hospital rapid sequence induction / intubations. Their data are consistent with the experience of other similar services and with the emergency airway management literature in general:

  • Failure to intubate is rare
  • Removing cricoid pressure often improves the view
  • A BURP manoeuvre can improve the view and facilitate intubation, but bimanual laryngoscopy / external laryngeal manipulation is better
  • Having an SOP optimises first-pass success rate

    Cricoid pressure and laryngeal manipulation in 402 pre-hospital emergency anaesthetics: Essential safety measure or a hindrance to rapid safe intubation?
    Resuscitation 2010(81):810–816

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    Poor pre-hospital intubation success

    A Scottish study of 628 pre-hospital intubation attempts in cardiac arrest patients records the rate of successful intubations, oesophageal intubations, and endobronchial intubations. Prehospital tracheal intubation was associated with decreased rates of survival to admission. This study has the limitations of a retrospective series but indirectly provides some further muscle to the supraglottic airway lobby.

    Field intubation of cardiac arrest patients: a dying art?
    Emerg Med J. 2010 Apr;27(4):321-3

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    Oxygen in AMI – no benefit, possible harm

    A Cochrane review examined the evidence from randomised controlled trials to establish whether routine use of inhaled oxygen in acute myocardial infarction (AMI) improves patient-centred outcomes, the primary outcomes being death, pain and complications.

    Three trials involving 387 patients were included and 14 deaths occurred. The pooled relative risk (RR) of death was 2.88 (95% CI 0.88 to 9.39) in an intention-to-treat analysis and 3.03 (95% CI 0.93 to 9.83) in patients with confirmed AMI. While suggestive of harm, the small number of deaths recorded meant that this could be a chance occurrence. Pain was measured by analgesic use. The pooled RR for the use of analgesics was 0.97 (95% CI 0.78 to 1.20).

    There is therefore no conclusive evidence from randomised controlled trials to support the routine use of inhaled oxygen in patients with acute AMI. A definitive randomised controlled trial is required.

    Oxygen therapy for acute myocardial infarction
    Cochrane Review

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    Traumatic Aortic Injury

    Two recent papers expand our knowledge of blunt traumatic aortic injury.

    UK crash data identified risk factors for low impact blunt traumatic aortic rupture, or ‘LIBTAR’ (crashes at relatively low speed): age >60, lateral impacts and being seated on the side that is struck are predictive of LIBTAR. This study should raise our index of suspicion of aortic injury in low-impact scenarios since low-impact collisions account for two thirds of fatal aortic injuries.

    Low-impact scenarios may account for two-thirds of blunt traumatic aortic rupture
    Emerg Med J. 2010 May;27(5):341-4

    Data from the Victorian State Trauma Registry showed pre-hospital mortality from traumatic thoracic aortic transection was approximately 88.0%, whereas patients who survive to reach hospital have a much lower hospital mortality (33.3%, and once patients who arrived in extremis were removed hospital mortality was reduced to 5.9%). Repair was performed in 46 patients, with 22 receiving initial endovascular repair and 24 receiving initial open repair. Mortality rates following surgery were 9.1% and 16.7%, respectively.

    The majority of patients arriving at hospital (57.1%) had an ISS of over 40 highlighting that these patients are unlikely to have only one serious injury and are likely to be more seriously injured than the normal trauma population. An ISS greater than 40 was a main predictor of mortality before repair.

    Aortic transection: demographics, treatment and outcomes in Victoria, Australia
    Emerg Med J. 2010 May;27(5):368-71

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    Junior pre-hospital doctors spend a bit longer on scene

    More junior pre-hospital doctors took longer on scene than their senior colleagues according to a German study, although patient clinical factors were the main determinant of scene time. The majority of cases were non-trauma presentations

    Duration of mission time in prehospital emergency medicine: effects of emergency severity and physicians level of education
    Emerg Med J 2010;27:398-403

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    Guideline improved pre-hospital RSI in kids

    French physicians provide pre-hospital critical care in medical teams of regional SAMU (service d’aide me ́dicale urgente). A national guideline was introduced in France to guide the management of traumatic brain injury (TBI), which included airway management. A study was conducted which examined the practice of paediatric pre-hospital intubation in TBI in comatose children both before and after the introduction of the guideline.

    After the guideline there were more pre-hospital intubations, with more standardised approach to rapid sequence induction(RSI). There were fewer complications and a 100% intubation success rate. Despite an increase in portable capnography use, PaCO2 was measured outside the recommended range of 35– 40 mmHg (3.5-4.5 kPa) in 70% of the cases upon arrival.

    Emergency tracheal intubation of severely head-injured children: Changing daily practice after implementation of national guidelines
    Pediatr Crit Care Med. 2010 May 13. [Epub ahead of print]

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