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Clinical skills session without slide 4
- 1. Clinical Skills Session Update day March 2016
- 2. Non-vis rates………. Myths Sonosite machines have higher non-vis rates than GE machines • The non-vis rates are very similar • The sonosite has less functionality • One of the reasons for it being chosen • Newer machines do have better imaging at depth but not sufficient to warrant new machines as yet Areas with high non-vis rates have higher levels of obese patients • All screening programmes have mixed degrees of socio-economic and ethnic backgrounds • Very similar across the country • No obesity epidemic within Oxfordshire Part time staff have higher non-vis rates than full time staff • Very similar rates across the programmes • May take longer time to stabilise once training has been completed
- 3. • High non vis rates are usually down to technician confidence at measuring the aorta at depth • National average is 1.43% • Achievable standard is 3.0% • NAAASP are looking at reducing the threshold for non- visualisation
- 4. How to improve the images….. • What’s the point? • Hopefully reduce the non-vis rates • Provides a better service to the subjects being screened • Improves performance and cost effectiveness of the programme • Ensures that the screening programmes and technicians are providing a quality service to the community based on quality standards that can be measured • May seem like a blunt tool • Every image should be optimised before taking a measurement • The images on obese patients will never be as good as those on slimmer patients • Use the non-vis guidance 4Thames Valley Update 12/11/14
- 5. • Increase depth • Sounds counter intuitive • Sonosite machines have the focal zone in the middle of the screen • Decrease the dynamic range • Reduces the number of shades of grey and therefore should help highlight the vessel walls • Can be reduced to -3 in obese patients on sonosite • Alter as much as required on the other machines • Reduce the frequency of the probe/ultrasound • Reducing the frequency of the probe will increase the wavelength • Improves penetration • Reduces image quality 5Thames Valley Update 12/11/14
- 6. • Remove harmonic imaging • Improves the frame rate • US machine has to wait less time before acquiring the image • Can make image worse • Remove compound imaging • Improves frame rate • Can make image worse • Always adjust the gain when taking this on or off 6Thames Valley Update 12/11/14
- 7. • Press harder • Brings aorta nearer to the probe • Mindful of patient comfort level • Image in transverse • Easier to image in transverse • Think of transverse as your friend • If you get stuck rotate probe • Don’t get obsessed with anterior vessels or IVC • Might not see them in obese patients • 50% visualisation rate 7Thames Valley Update 12/11/14
- 8. • Use two hands to press the probe down • Mindful of MSK injury • Get colleague to freeze • Get patient to breath in and hold breath • Relaxes the diaphragm • Push probe down when breathing in • Stop the scan • Get colleague to have a look • 2 mins away can give you different perspective • Know your limitations 8Thames Valley Update 12/11/14
- 9. Hints and tips Increase depth Decrease dynamic range Reduce frequency of the probe Remove harmonic imaging Remove compound imaging Press harder Transverse imaging Anterior vessels Use two hands Get patient to breath in, hold it and then breath out Ask colleague to look/take a break/know when to stop Tell patient to wait outside
- 10. 10 Presentation title - edit in Header and Footer