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PRODUCTS
XL probe
Expand your diagnosis, measure more patients with the XL probe.
On obese patients, biopsy is often difficult to recommend and fibrosis blood markers may be inefficient.
Echosens extends the limits of the existing FibroScan® 502 to obese patients with the new XL probe* which:
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Improves the use of FibroScan® on obese patients thanks to a new 2.5 MHz ultrasonic transducer and a new electrodynamic transducer (vibrator)
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Performs deeper calculation between 35 and 75 mm with an adapted algorithm
GLOBESITY
Today, the global epidemic of overweight and obesity - "globesity1" - is becoming a major public health problem in many parts of the world.
More than 1.1 billion people are estimated to be overweight worldwide. Around 320 millions of them are now considered as obese.
The increasing prevalence of overweight and obesity is associated with many diet-related chronic diseases including:
• Diabetes
• Cardiovascular diseases
• Hypertension
• Some cancers
Precaution
Until now, as reported in several studies, the performance of FibroScan® 502 was limited in overweight people (from and above 25-28kg/m²)2 resulting in a difficult even impossible examination of these patients.
Indeed, measurements with FibroScan® may fail on obese patients for several reasons.
Because of the fat and connective tissue thickness:
• Shear wave does not propagate properly though the liver and ultrasound signals are attenuated and aberrated: No or few signals leads to no result
• Distance between the skin and liver is too large so measurement may partly be performed outside of the liver which will lead to a biased results
1.http://www.who.int/nutrition/topics/obesity/en/index.html
2.Foucher, J., L. Castera, et al. (2006). Prevalence and factors associated with failure of liver stiffness measurement using FibroScan® in a prospective study of 2114 examinations. European Journal of Gastroenterology & Hepatology 18(4): 411-2.
PRODUCT FEATURES
A new Probe (XL) with:
• A new design improving operator comfort (lighter and more ergonomic)
• A new more sensitive ultrasonic transducer at a low frequency of 2.5 MHz adapted to enhance signal penetration deeper into liver tissues
• A new electrodynamic transducer (vibrator) to increase vibration shot amplitude in order to take into account connective tissue thickness between the skin and liver
New Software with new features:
• XL probe parameters are automatically set up after probe selection
• An optimized calculation algorithm allows stiffness measurement at a deeper depth (between 35 and 75 mm)
An ultrasound scanner for:
• Liver localization to help choose the optimal measurement point and ensure the performance of the examination into the liver
• Skin Capsula Distance (SCD) measurement to choose the appropriate probe according to the Echosens recommendations(a minimum of 25 mm SCD is mandatory to use the XL Probe)
New dedicated training including:
• A specific theoretical session to learn concepts of Transient Elastography on obese people and understand indications & criteria of use of the XL probe
• A practical session to teach good examination practice with the XL probe and to know how to use the ultrasound scanner to perform a liver localization and Skin Capsula Distance measurement
Warnings:
• User shall hold the probe perpendicular to the probe/skin (XL Probe does not improve perpendicularity)
• Using the XL Probe on patients with a SCD < 2.5 cm will lead to false results (biased estimation)
• FibroScan® examination will be difficult on patients known as being difficult to examine with an ultrasound scanner
• Examination on obese patients can be difficult and longer even with the XL probe
• Operators must take time to perform an examination
INDICATIONS FOR USE
Before each liver stiffness examination, for optimal performances of the XL Probe, Echosens recommends performing a localization of the liver and assessing the Skin Capsula Distance (SCD).
Skin Capsula Distance (SCD)
The SCD is the key parameter because liver stiffness measurements start at a fixed depth depending on the probe type chosen. SCD represents the distance between the point of application on the skin of the transducer and the hepatic capsula. This parameter is not readily available from patients, so Echosens provides an ultrasound scanner.
The XL Probe must be used for patient morphology:
| 2,5 cm ≤ SKin Capsula Distance < 3,5 cm |
Thoracic Perimeter (TP)
The TP is generally correlates to thoracic subcutaneous thickness. It can therefore be used as a substitute criterion if Skin Capsula Distance is not available and if the thoracic perimeter exceeds 110 cm.
Even though BMI indicates if someone is obese, it is not a reliable criterion for the use of the XL probe because it is not indicative of the fat localization. For example, the XL probe makes possible measuring patients with a BMI of 60 if the SCD is less than 35mm.
Benefits of the XL Probe
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For the physician, it's a unique opportunity to:
• Operate with the same device and enhance his initial investment
• Leverage his manipulation and his interpretation experience on the FibroScan®
• Enlarge his diagnosis capacity and his patient work flow
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For obese patients, it's a way to :
• Access to a safe examination with non invasive technology
• Avoid the risk, pain and fear of biopsy
• Have less stress, more comfort and immediate results
Technical Information
| probe | Probe Size (L x Diameter) |
Weight | Transducer Diameter | Frequency | depth of measurements |
|
XL |
158x52mm |
0.5Kg |
10mm |
2.5Hz |
35mm to 75mm |
CLINICAL TRIAL
V. de Lédinghen1, C. Fournier2, J. Foucher1, V. Miette2, V. Rigalleau1, J. Vergniol1, W. Merrouche1, L. Sandrin2
1.Centre d'Investigation de la Fibrose hépatique, Hôpital du Haut l'Evèque, Pessac, France
2.Echosens, Paris, France
Studied Population
• 99 patients with BMI > 30kg/m²
Methodology
• Measure patients with both M and XL probes
Objectives
• Assess the added value of the XL probe compared to the M Probe
Results
• 53 patients were successfully measured with M probe (5 valid measurements)
• 46 patients were not measured with M probe
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XL Probe allowed 32 additional patients to be measured (+70%)
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The highest BMI was 61 kg/m²
Out of the 46 patients not measured with the M probe* :
For additional information, contact our sales team: Enquiry Form
*To enhance your productivity, the Echosens Service Centre or your local distributor will support you with calibration, repairs, parts and maintenance services. FibroScan® probes need to be calibrated every six months to maintain performance.
