Our inside reporter Dr Louisa Chan provides an update from Day One of the London Trauma Conference:
At risk of sounding like a resuscisaurus, last year was my first foray into the world of blogging. I’m proud to say that the genetic make up of most emergency physicians allows us to adapt so that others do not die! And so here I am again, making my way into the big smoke to report on the great developments of 2013.
I’ve struggled in the past to prise myself away from the main trauma track, it is after all the London Trauma Conference, which has left me curious as to the content of the Cardiac arrest symposium, this year it has been integrated, so I finally get to scratch that itch.
Prehospital Cardiac Arrest Management in Scotland
In Scotland, of 50 cardiac arrests, 6 will survive to hospital and only 1 will survive to hospital discharge. The survival to hospital discharge in the UK is getting worse (4.8% 1995- 0.7% 2007)
Spurred on by these dreadful figures and a personal quest to improve cardiac arrest care (his father succumbed to a cardiac arrest in his forties)
All in all he has studied 400 cardiac arrest patients pre hospital. So what has he learnt?
- Precise application of the chain of survival to your own system is vital in the delivery of Quality CPR.
- He started in the ambulance control room analysing calls (CPR starts at step 11 so more experienced dispatchers skip thee quicker) and worked his way through the chain of survival.
- The TOPCAT study revealed a 3 min delay to compressions where early intubation and cannulation were performed. Through an education program delivering knowledge and skills with individualised feedback they were able to increase on-chest time.
- LEADERSHIP was a big factor. Having a clinician dedicated to managing the team improved on chest time and is now delivered by paramedics manning a car response in Edinburgh.
- Breaks in CPR during movement are overcome by a mechanical chest compression device on carry sheet.
- Non technical skills are monitored by camera feed
- These changes have led to a survival to hospital discharge rate of 38% for patients in VF
- This could translate into an extra 300 lives saved in Scotland when these changes are rolled out nationally.
- And now there is a move to transport patients who are in VF after the third shock then straight to cath lab.
Echocardiography in cardiac arrest
Prof Tim Harris spoke about his passion – echocardiography in resuscitation. If you were in any doubt before then you would leave convinced.
Of course echo should not interfere with CPR so it should be done during the rhythm check with a 10 sec count down.
He covered the usual uses; PEA vs EMD in prognostication (92% sensitivity and 82% specificity to ROSC), Circulation assessment and an estimation of EF (Normal function – anterior mitral valve leaflet hits the septum or is within 5mm , EF 30-45% between 5mm- 18mm and >18mm ant mitral valve leaflets – 30% EF)
Cardiogenic shock after cardiac arrest
Professor Deakin: optimising cardiac function after ROSC revolves around the three elements of preload, SVR and myocardial contractility. For those who can still remember how, he recommends preload should be optimised to a LA pressure 15-20mmHg (2-12 normal) with a Swan Ganz catheter.
SVR and contractility can be manipulated thereafter using traditional vasopressors and inotropes or more novel agents like Levosimendan.
Mechanical devices such as IABP, Impella, TandemSupport are useful if available.
Where does the future lie? Perhaps synchronised pacing, hypothermia, extrathoracic ventilation and gene therapy.
Prof Karim Brohi: external chest compressions have been around since the 1960′s. Without a doubt external compressions generate a cardiac output, but is this the best way?
Over the last 10 years the priorities in traumatic cardiac arrest have changed – chest compressions are not instituted until after reversible causes have been addressed.
In non traumatic arrest how could we improve?
In canine models coronary perfusion pressure is five times better with internal cardiac massage, providing better survival rates with intact neurology.
There are a few human studies showing marked differences in cardiac index: 1.31 in the open group vs 0.61 in the closed group. In a Japanese study (1993), ROSC was achieved in 58% in open vs 1% closed.
The technique is two handed and the same as that taught in thoracotomy training. The difference is that in medical cardiac arrest you can use a smaller incision ( left lateral).
Who should we use open cardiac massage on? Perhaps in tamponade and pulmonary embolism?
How about when? When 10-15min with “standard care” has failed?
Perhaps it is time for a trial?
Post cardiac arrest syndrome and neuro protective measures
Prof Simon Redwood and Matt Thomas had overlapping talks on this . The bottom line is don’t have too much or too little CO2 or O2. The therapeutic hypothermia debate continues, what is evident is that there should be temperature control to avoid hyperthermia but what temperature? And there may be other benefits to hypothermia eg. limitation of infarct size.
What has been evident from all the speakers today is that it is an integrated system that saves lives and in order to guide the development of your system you need data and the belief that you can improve cardiac arrest outcomes.
More from me tomorrow!