ENK Oxygen Flow Delivery System
Reviewed and revised 14 July 2015
OVERVIEW
- The ENK oxygen flow delivery system is used in conjunction with emergency cannula cricothyroidotomy
USE
- emergency oxygen delivery following cannula cricothyroidotomy
DESCRIPTION
- oxygen supply connector at one end
- Luer lock connection for attachment to a needle cricothyroidotomy tube at the other end
METHOD OF USE
- The ENK is connected to the oxygen supply and to the cricothyroidotomy catheter
- Oxygen flow at 15 L/min or (preferably) higher
- intermittently covering and releasing the holes in the delivery system by pressing thumb and index finger together allows control of oxygen delivery
- About 100 cycles per minute is recommended by the manufacturer, however I prefer the approach described by Andy Heard and collleagues:
- administer the first breath over 4 s (At 15 L/min, or 250 mL/s) this will inflate the lungs with 1L of oxygen; observe for chest rise
- Subsequent jets (breaths) should be administered over 2 s (i.e. 500 mL). Only give subsequent jets (breaths) when needed: observe the rise in oxygen saturation and wait until the oxygen saturation has fallen by 5% from the maximum achieved. This avoids excessive jetting and reduces the likelihood of barotrauma
- Wait again for a rise and then 5% fall in SpO2 before delivering subsequent breaths
- If there is no SpO2 reading for some reason, it is safe to insufflate 500 mls every 30 s
- unlike a Manujet™ or similar device, the ENK Oxygen Flow Modulator device does not need to be disconnected from the cannula between jets (breaths) to allow expiration
- ensure decompression occurs in cases of complete airway obstruction
COMPLICATIONS
- failure to chest rise, due to:
- kinking or displacement of the cannula (stop insufflation, confirm position by aspirating air with a syringe before further ‘jets’)
- equipment failure or disconnection (check oxygen is on and all connections are intact)
- barotrauma
- pneumothorax
- pneumomediastinum
- dislodgement (too much pressure can cause the catheter to be ejected from the trachea)
- hypercapnea (this device allows oxygenation, not ventilation)
- dynamic hyperinflation
VIDEO
Andy Heard’s video on emergency percutaneous oxygenation techniques
References and Links
Web resources
- Cook Medical — ENK Oxygen Flow Modulator Sets
Critical Care
Compendium
Chris is an Intensivist and ECMO specialist at The Alfred ICU, where he is Deputy Director (Education). He is a Clinical Adjunct Associate Professor at Monash University, the Lead for the Clinician Educator Incubator programme, and a CICM First Part Examiner.
He is an internationally recognised Clinician Educator with a passion for helping clinicians learn and for improving the clinical performance of individuals and collectives. He was one of the founders of the FOAM movement (Free Open-Access Medical education) has been recognised for his contributions to education with awards from ANZICS, ANZAHPE, and ACEM.
His one great achievement is being the father of three amazing children.
On Bluesky, he is @precordialthump.bsky.social and on the site that Elon has screwed up, he is @precordialthump.
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