Clinical Governance Day 2nd July 2014

CGD Flyer (1)

See here for directions

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Learning points from June 18th 2014

Here are some of the learning points from the Sydney HEMS Clinical Governance Day 18th June 2014:

Clinical cases
Some reminders cropped up that are worth revisiting:

  • Rocuronium dosing for RSI: At least 1.2 mg/kg is recommended. Lower doses may be a reason for a lack of first-pass success at laryngoscopy. In the next iteration of out airway SOP we will be recommending 1.5 mg/kg
  • Remember to do a thorough physical (ie. MANUAL – palpation) examination of the chest (including the parts of the lateral and posterior chest wall that you can access). Crepitus, deformity, and flail segments may otherwise be easy to miss.
  • In maxillofacial disruption with haemorrhage, remember to reduce the fracture before splinting it, just as you would with a deformed limb. This often requires manually moving the midface by grasping the upper teeth. The subsequent placement of balloon catheters, when inserted horizontally in the nasal space, are more likely to be effective and correctly sited.
  • During intubation the bougie should not be placed blindly (ie. no view of the interarytenoid notch from which to guide anterior placement) if other steps to optimise first pass success are not in place, namely optimal positioning and external laryngeal manipulation.

Winch review

  • It’s Winter, and late or last light winches may result in the team being inserted to the patient but not extracted by winch, sometimes necessitating an overnight stay in the field. Make sure in your personal kit you have thermals, gloves, beanie, and light sources including a head torch. Physicians should remember that the yellow survival pack should be put into the cabin prior to leaving base. Remember where it’s kept: in the boot for the AW139 and in the hangar SAR store for the EC145. If you spend the night in a canyon in Winter you’ll wish you had it!
  • Winching near to cliff tops or mountain tops can risk turbulence as the air flows off the high land. It may sometimes be necessary for safety reasons to do a higher winch at these sites to ensure the aircraft is high enough to avoid this.
  • In some winch missions the access skills of a second paramedic may be required, resulting in the physician being initially left behind. Options are then to bring the patient to the physician or to deliver the physician to a rendezvous point by another means (if the patient’s injuries warrant it).

 

Obstetric training

Case challenges were put to the group based on real and imaginary obstetric retrieval challenges. Those who did the prereading fared best! A reminder of the references is here:

Post Partum Haemorrhage Guidelines

RANZCOG

RCOG

Eclampsia

NICE (UK)

Life in the Fast Lane

Perimortem C-Sections

Resus.ME

Broome Docs

St. Emlyns

 

Simulations

Two great cases facilitated by HEMS doctors Phil Webster and Dave Monks, including a great prehospital resuscitative hysterotomy case using a model invented by Phil.

Here Dr Carla Richardson and paramedic Marty Pearce do an amazing job considering they had no idea what to expect from the scenario or the model. The case was a prehospital traumatic cardiac arrest in a near-term pregnant patient. Carla and Marty had completed intubation, bilateral thoracostomies, and started blood transfusion in the mother prior to hysterotomy.

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Clinical Governance Day 18th June 2014

CGD Flyer 18th June

See here for directions

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Ketamine for TBI: Why not?

Ketamine ICPThe 1970s were a dark time for ketamine use in patients with intracranial pathology. In patients with non-traumatic lesions, ketamine was suggested to increase intracranial pressure (ICP) using various markers as end-points to suggest this (see references below). Although this concern still remains with traditionalists, we have since seen multiple studies debunking this myth.

Now there is finally a meta-analysis supporting the suggestion that ketamine certainly does not seem to increase ICP. A systematic review of RCTs comparing the effects of ketamine vs opioids on 24-hour ICPs found that ketamine produced similar changes to ICP, MAP and CPP when compared to opioids. Surprised? Me neither.

Although this paper has some obvious flaws (small numbers, only 5 trials included, different choice of opioids, trials took place over 17 years, boluses vs infusions not addressed), this is one of the first meta-analysis to look at this surprisingly commonly misunderstood practice.

It is probably time for those Anaesthetics/Emergency Medicine/Pharmacology text books to be rewritten. And it is probably time to stop discussing whether ketamine can be used as an induction agent in TBI.

  1. Wang X, Ding X, Tong Y, Zong J, Zhao X, Ren H, Li Q. Ketamine does not increase intracranial pressure compared with opioids: meta-analysis of randomized controlled trials. J Anesth. 2014 May 24.
  2. Gardner AE, Olson BE, Lichtiger M. Cerebrospinal fluid pressure during dissociative anesthesia with ketamine. Anesthesiology 1971;35:226-8.
  3. Wyte SR, Shapiro HM, Turner P, et al. Ketamine induced intracranial hypertension. Anesthesiology 1972;36:174-6.
  4. Gibbs JM. The effect of intravenous ketamine on cerebrospinal fluid pressure. Br J Anaesth 1972;44:1298-302.
  5. Gardner AE, Dannemiller FJ, Dean D. Intracranial cerebrospinal fluid pressure in man during ketamine anesthesia. Anesth Analg 1972;51:741-5.
  6. Shaprio HM, Wyte SR, Harris AB. Ketamine anesthesia in patients with intracranial pathology. Br J Anaesth 1972;44:1200-4.
  7. List WF, Crumrine RS, Cascorbi HF, et al. Increased cerebrospinal fluid pressure after ketamine. Anesthesiology 1972; 36:98-9.
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CGD June 4th – Toxicology

Here is the programme for next week’s CGD.

CGD Flyer (4)

We have a toxicology theme this week, so brush up on your tox knowledge with these poisonous resources:

The Toxicology Conundrum Series from LITFL

A Couple of Interesting Recent Toxinology Abstracts

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CGD Highlights 21st May 2014

Ultrasound Workshop – The FALLS Protocol

Massive thanks to our guest speaker Dr Chris Partyka from The Blunt Dissection for delivering an excellent workshop on critical care ultrasound! The content from his workshop, including the FALLS protocol for undifferentiated shock, is available here.

Advanced ECG Workshop – Chest Pain

Below are the images from the ECG workshop on chest pain, along with some learning points discussed on the day. Follow the links for more information on each individual topic. 

ECG 1ECG 1

  • Peaked T waves + upsloping ST depression in the precordial leads = the De Winter ECG pattern. This is a sign of acute LAD occlusion and should be treated as a STEMI equivalent.
  • Also note the ectopic atrial rhythm — P wave inversion in II, III + aVF.

 Read more about De Winter’s T waves here

 

ECG 2 ECG 2a Inferior STEMI with reciprocal change. There are additional signs of right ventricular infarction:

  • STE in III > II
  • STE in V1-2

This rightward vector of the injury current (III > II) suggests an RCA occlusion rather than a LCx occlusion. Repeat ECG with a V4R lead position confirms a right ventricular infarction (STE  in V4R). ECG 2b Read more about right ventricular infarction here.

 

ECG 3 ECG 3 There is evidence of global subendocardial ischaemia, suggestive of LMCA occlusion or severe triple vessel disease:

  • Widespread horizontal ST depression, most prominent in the leftward-facing leads I, II and V4-6
  • STE in aVR > 1mm
  • STE in aVR > V1

Differential diagnoses for widespread ST depression include hypokalaemia and rate-related changes with SVT. Read more about LMCA occlusion here.

 

ECG 4 ECG 4 This ECG is a classic example of acute pericarditis. Positive findings include:

  • Widespread concave (“saddleback”) ST elevation 
  • Widespread PR segment depression
  • Spodick’s sign — a down-sloping TP segment that gives the baseline a kind of “zig-zag” appearance
  • ST segment / T wave height ratio > 0.25 in V6, which favours a diagnosis of pericarditis over benign early repolarization. 

Read more about pericarditis vs BER here. Amal Mattu gives some great tips on differentiating pericarditis from STEMI here

 

ECG 5 ECG 5 This ECG demonstrates an extensive infero-postero-lateral STEMI:

  • ST elevation in II, III, aVF (inferior) plus leads I, V5-6 (lateral)
  • ST depression in V1-3 with evolving dominant R waves (Q wave equivalent) and terminal T wave positivity = signs of posterior infarction

The leftward-facing injury vector suggests LCx rather than RCA occlusion, as recognised by:

  • STE in II > III
  • STE in I, V5-6

Repeat ECG with posterior leads (V7-9) confirms posterior wall infarction. ECG 5b Read more about posterior infarction here.

 

ECG 6  ECG 6

  • Biphasic T waves in V1-3 (inverted in V4) typical of Wellens’ syndrome 
  • This ECG pattern is highly specific for a critical occlusion of the LAD.

Read more about Wellens’ syndrome here.

 

ECG 7 ECG 7 This ECG demonstrates LBBB with positive Sgarbossa criteria, indicating superimposed myocardial infarction:

  • Concordant ST elevation in aVL 
  • Concordant ST depression / T wave inversion in II, III, aVF
  • Additional concordant ST depression in V5

The pattern is suggestive of anterolateral STEMI with inferior reciprocal change. Sgarbossa criteria for diagnosing MI in the presence of LBBB or paced rhythm include:

  • Concordant ST elevation > 1mm in any lead
  • Concordant ST depression > 1mm in V1-3
  • Excessively discordant ST elevation = ST elevation > 5mm (original Sgarbossa rule) or > 25% of S wave height (modified Smith rule)

Read more about the Sgarbossa criteria here  

 

ECG 8ECG 8 This is an ECG of pulmonary embolism with right heart strain, demonstrating:

  • Sinus tachycardia (present in ~50% of patients with PE)
  • The right ventricular strain pattern = Simultaneous T-wave inversions in the right precordial (V1-3) and inferior leads (III, aVF)
  • Minor, non-specific ST changes in multiple leads

Other ECG changes seen with PE include:

  • Right axis deviation
  • Complete or incomplete RBBB
  • Dominant R wave in V1
  • S1 Q3 T3 = neither sensitive nor specific for PE; found in only ~20% of patients

Read more about ECG changes in PE here

 

ECG 9 ECG 9 This is an example of benign early repolarization, demonstrating:

  • Concave (“saddleback”) ST elevation in multiple leads, most prominent in the precordial leads.
  • J-point notching (the “fish-hook pattern”) in V4.
  • ST segment / T wave height ratio < 0.25 in V6, which favours BER over pericarditis.
  • No features of acute STEMI — the T-wave inversion in III is a normal variant.

Read more about benign early repolarization here.

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CGD 21st May 2014 – Programme

The programme for next week’s CGD is as follows: CGD Flyer 21-05-14 Afternoon education workshops will include:

  • Updates in Ultrasound – A hands-on refresher session on eFAST, RUSH and basic echo with special guest Dr Chris Partyka (Ultrasound Registrar at Liverpool Hospital, EM blogger at The Blunt Dissection).
  • ECGs to Rock a Retrievalist – Advanced ECG Workshop by Dr Ed Burns (author of the Life in the Fast Lane ECG Library).

Pre-Reading Brush up on your ultrasound and ECG knowledge with these useful FOAM resources.

Ultrasound Resources

  • Mount Sinai Emergency Medicine Ultrasound series — Tutorials on FAST and RUSH
  • Academic Life in Emergency Medicine — Excellent overview of the RUSH protocol
  • Cliff’s awesome talk on Trauma USS as presented on the Ultrasound Podcast (you might recognise this one from our HEMS induction week)
  • Scott Weingart’s 2-part lecture on RUSH — Part 1 (busy readers skip to ~11:40 to get to the main points) and Part 2

Some other US websites worth checking out:

 Electrocardiography Resources The theme of the ECG workshop is chest pain. Check out the following pages from the LITFL ECG Library:

Some other ECG websites worth checking out:

Looking forward to seeing you there!

All NSW Health staff welcome. Sign in required. See here for directions.

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