Lung ultrasound for pneumothorax: literature for practice and simulation

From the ‘Sim and Choppers’ blog by Dr Andrew Petrosoniak – a post with links to studies about use of ultrasound ‘M mode’ while in a helicopter, evidence suggesting that we need to scan further down the chest than many protocols suggest, and a fantastic idea for simulating lung ultrasound for training purposes.

Read the post here…      Many thanks Andrew!

Time-motion mode lung ultrasound. (a) Normal lung and (b) pneumothorax patterns using time-motion (M) mode lung ultrasound. In time motion mode, one must first locate the pleural line (white arrow) and, above it, the motionless parietal structures. Below the pleural line, lung sliding appears as a homogenous granular pattern (a). In the case of pneumothorax and absent lung sliding, horizontal lines only are visualised (b). In a patient examined in the supine position with partial pneumothorax, normal lung sliding and absence of lung sliding may coexist in lateral regions of the chest wall. In this boundary region, called the ‘lung point’ (P), lung sliding appears (granular pattern) and disappears (strictly horizontal lines) with inspiration when using the time-motion mode.

Bouhemad et al. Critical Care 2007 11:205   doi:10.1186/cc5668

HEMS Initiative featured in ADHB newsletter

So THAT’S what those people in red suits are doing!

 

“It’s been a year since ADHB emergency medicine specialists started working on board rescue helicopters. 127 rescue missions later, the trial has been deemed a success in lifting the quality of pre-hospital care in New Zealand.

The trial is a collaboration between the Auckland Rescue Helicopter Trust and ADHB, wherein our clinicians work alongside advanced paramedics, resulting in improved outcomes for patients.”

Read more here…

Pre-hospital RSI Resources

Pre-Hospital Intubation: Why all the controversy?

A 2007 review of reasons why pre-hospital intubation is controversial, with positive and negative evidence. By David Lockey, Frenchay Hospital, Bristol, and London HEMS

Read more here…

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Pre-Hospital Rapid Sequence Intubation

A review of method, controversy, and evidence, by Dr Peter Sherren (London HEMS), delivered to Australian College of Ambulance Professionals, October 2012

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Pre-Hospital Rapid Sequence Intubation Improves Functional Outcome For Patients With Severe Traumatic Brain Injury

Bernard et al, Annals of Surgery, 2010

A total of 312 patients with severe TBI were randomly assigned to paramedic rapid sequence intubation or hospital intubation. The success rate for paramedic intubation was 97%. At 6 months, the median GOSe score was 5 (interquartile range, 1–6) in patients intubated by paramedics compared with 3 (interquartile range, 1–6) in the patients intubated at hospital (P = 0.28). The proportion of patients with favorable outcome (GOSe, 5–8) was 80 of 157 patients (51%) in the paramedic intubation group compared with 56 of 142 patients (39%) in the hospital intubation group (risk ratio, 1.28; 95% confidence interval, 1.00–1.64; P = 0.046).

Read more here… (pdf source – Ambulance Victoria)

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Head Injury Retrieval Trial Results

A presentation by Alan Garner, Medical Director of Careflight, at ICEM 2012

Physician led prehospital trauma teams decrease the length of ICU stay for patients with severe head injury. Sensitivity analyses indicate that there may also be significant benefits in mortality and morbidity for transportation injury patients that was obscured by the highly selective cross overs in this trial

Read more here…

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Greater Sydney Area HEMS Pre-Hospital RSI Manual

Read more here…

What? There are FIVE patients?!

Minor fender-bender in Dubai

One of the earlier jobs I did with the Auckland HEMS proved to be one of the most educational for me. The paramedic and I were tasked to an MVA with two patients. On arrival we discovered there were actually five patients – two with abdominal injuries and abnormal vital signs, one with an open femur fracture, one with a trivial head injury but anti-coagulated, and one with minor injuries. Several St Johns ambulance crews were already on scene, and managing things admirably. The two patients with abdominal injuries were transported by helicopter (this proved to be the correct decision), but as a doctor not familiar with chaotic scenes and multiple patients, I learnt some valuable lessons:

1) Doctors and paramedics assess patients differently

Initially the paramedic and I attempted to ‘divide and conquer’, with us splitting the patients between us for initial assessment. Coming from different backgrounds, the focus of our assessments was different, with the result being that I ended up assessing his patients as well, and he ended up assessing mine. This was clearly inefficient.

With the main function of the HEMS doctor being to provide additional resuscitation and medical skills to patients who need them, a more efficient way of us assessing which patients would benefit from my intervention would have been for us to briefly assess all five together, identify the two sickest for helicopter transport, and leave me to manage/package them while the paramedic assisted the ambulance officers with scene management and care of the other patients, who were destined for road transport. There would be a clear exception to this however when the scene controller directs the doctor to the sickest patient(s) on helicopter arrival.

2) Doctors need to be familiar with ambulance hierarchies and skill mixes

Some of the St Johns staff on scene were volunteer ambulance officers without the authorisation to perform certain interventions (giving morphine or splinting the femur fracture for example). I was unaware of this, and mistakenly assumed that such interventions would be taking place without input from the helicopter paramedic, myself, or the senior paramedic at the scene. The fact that these interventions did not happen at the time I assumed they would contributed to my perception of chaos (I take my hat off to paramedics who do this regularly!). ASKING about the skill set of ambulance officers is crucial to ensure that the patient gets the right care at the right time with maximum efficiency – assume nothing!

3) A scene with multiple patients provides significant equipment challenges

The HEMS doctors bag that we carry contains equipment for advanced medical interventions and surgical procedures. It is NOT well suited to more basic first aid functions, obtaining IV access, providing analgesia, and commencing IV fluid. For the patients at this scene, interventions like this were all that were required pre-hospital. With patients spread apart over the scene, several raids on the Thomas pack were required – this was time-consuming and inefficient. Our equipment needs work to make it more amenable to splitting it between multiple patients, but in the interim I now carry a small pack in my pocket with some basic equipment (cannulae, leur locks, flushes, drawing-up needles, gloves, tape etc). A thigh pouch has also made its way into use.

4) With two stretchered patients in the helicopter, intervention is difficult

The two patients we transported were both on stretchers wearing cervical spine collars. the paramedic and I were tucked at the front under a hefty pile of equipment. Performing any significant intervention on a patient in-flight would have been virtually impossible. If a patient is unwell enough to require significant intervention in-flight, the risks and benefits of taking a second patient on the same flight need to be seriously considered.