Endoscopic ultrasound (EUS): new perspectives in modern diagnostics

Endoscopic ultrasound (EUS) is a revolutionary diagnostic technique that combines the visual capabilities of endoscopy with the precision of high-resolution ultrasound imaging. This advanced technology allows doctors to obtain detailed images of the walls of the digestive tract and surrounding organs that were previously difficult to obtain with other examination methods.

The EUS is particularly valuable in gastroenterology, where accurate diagnosis and staging of disease are critical for appropriate treatment planning. For patients, this means less invasive interventions and greater accuracy of diagnosis.

As technology advances, companies like Endomedix are constantly working to make EUS devices even more efficient and safer, thereby improving the quality of patient care.

What is endoscopic ultrasound?

Endoscopic ultrasound is a specialised diagnostic technique that combines direct visualisation of the endoscopy with a high-frequency piezoelectric ultrasound head. This combination allows doctors to simultaneously examine the surface and depth structures of internal organs.

How the technology works

EUS devices are specialised endoscopes with ultrasound probes at the tip. Two main types are distinguished:

Radial EUS (360°): This type takes 360-degree images in a circular view, allowing a full examination of surrounding structures.

Linear EUS (180°): This version provides a 180° angle of view and has a side view function (45-60°). It is particularly useful for targeted histological sampling.

Frequencies and resolution

EUS devices operate in the 5-12 MHz frequency range:

Lower frequency (5-7 MHz): Used to visualise deeper structures

Higher frequency (8-12 MHz): Allows more detailed, near-surface imaging

The mini-probes can operate at frequencies of up to 20 MHz, which can be inserted into the working channel of a conventional endoscope to examine even finer details.

EUS diagnostic applications

Upper digestive tract examination

Diseases of the oesophagus:

Morphology and depth of spread of oesophageal tumours

Staging of non-metastatic oesophageal tumours

Evaluation of the surrounding lymph nodes

Stomach diseases:

Accurate staging of gastric tumours

Evaluation of MALT lymphoma

Differential diagnosis of submucosal lesions

Characterisation of GIST tumours

Pancreas and bile duct examination

The EUS provides outstanding accuracy in pancreatic testing:

For inflammation of the pancreas:

Clarifying the aetiology of acute pancreatitis of unknown origin

Detection of gallstones in medium and low risk cases

Chronic pancreatitis:

Determining the stage of the disease

Recognising complications

Investigation of suspected autoimmune pancreatitis

Pancreatic tumours:

Accurate localisation and staging of pancreatic adenocarcinoma

Lymph node involvement assessment

Assessment of vascular invasion

Pancreatic cysts:

Determining the type of cyst

Malignancy risk assessment

Long-term monitoring

Bile and gallbladder tests

Detection of gallstones:

An alternative to ERCP in low and medium risk cases

Detection of small gallstones that cannot be seen by other methods

Gallbladder lesions:

Differential diagnosis of gallbladder wall thickening

Characterisation of gallbladder polyps

Early detection of malignant lesions

Ampulla and bile duct tumours:

Staging of ampullary tumours larger than 2 cm

Evaluation of distal choledochal carcinoma

Lower digestive tract examination

Rectal tumours:

Accurate staging of non-metastatic rectal tumours

Judging surgical resectability

Monitoring the effectiveness of neoadjuvant therapy

Other applications:

Evaluation of mediastinal tumours

Detection of anal sphincter defects in incontinence

Localisation of enterocutaneous fistulas in Crohn's disease

EUS-guided sampling (FNA/Core biopsy)

One of the biggest advantages of EUS is that it allows targeted histological sampling of areas that are difficult to access by other methods.

Applications of FNA (Fine Needle Aspiration):

Digestive tract tumours:

Tumours of the oesophagus, stomach and rectum

Submucosal lesions

Lymph node sampling

Pancreatobiliary diseases:

Fluid analysis of pancreatic cysts

Solid pancreatic lesions

Cancerous narrowing of the bile ducts

Mediastinal and retroperitoneal lesions:

Regions difficult to access by non-surgical methods

Primary and metastatic tumours

Safety of sampling

EUS-guided sampling is a relatively safe procedure:

Complication frequency: 1-2%

Risk of pancreatitis after FNA is minimal

Low risk of bleeding

Risk of infection is rare

Advantages of EUS compared to other imaging techniques

Advantages compared to CT and MRI

Better resolution: EUS provides greater resolution in the examination of the layers of the gastrointestinal wall than CT or MRI.

Real-time analysis: Ultrasound shows moving structures in real time, which is particularly valuable for examining the vascular system.

No contrast material is needed: The EUS baseline test does not require the administration of a contrast agent, making it safer for kidney patients.

Compared to traditional ultrasound

No gas interference: Unlike transabdominal ultrasound, EUS is not disturbed by intestinal gas.

Closer to the target organ: The endoscopic approach allows you to get closer to the organ under examination, resulting in better image quality.

Combined information: It provides endoscopic and ultrasonographic information simultaneously.

Patient preparation and aftercare

Pre-examination preparation

Upper supply duct for EUS:

8-12 hours fasting required

Medicines overview

Coagulation parameters control (in case of sampling)

Antibiotic prophylaxis in special cases

Lower supply duct for EUS:

Bowel preparation, similar to colonoscopy

Enema or use of laxative agents

Maintaining fluid intake

Sedation and monitoring

The test is usually done in conscious sedation:

Continuous vital parameter monitoring

Measurement of oxygen saturation

Heart rate monitoring

Checking blood pressure

Post-examination care

Immediate observation:

1-2 hour observation period

Monitoring the stabilisation of vital parameters

Early detection of complications

Home instructions:

Do not drive within 24 hours

Avoid drinking alcohol

Watch for signs of complications

When to see a doctor

Complications and risks

Possible complications

General endoscopic complications:

Perforation (rare, <0.1%)

Bleeding (rare)

Respiratory or heart problems due to sedation

Damage to teeth or dentures

EUS-specific complications:

Pancreatitis (FNA after, <1%)

Infection (especially after cyst puncture)

Duodenal perforation in linear EUS

Risk factors

High-risk patients:

Severe heart disease

Respiratory failure

Susceptibility to haemophilia

Severe general condition

Relative contraindications:

Unstable vital parameters

Recent myocardial infarction

Severe coagulopathy

Uncooperative patient

The future of the EUS and innovations

Technological development

Innovations in imaging:

Higher resolution probes

3D imaging development

Contrast enhanced EUS

AI-based image analysis

Expanding therapeutic applications:

EUS-guided ablation techniques

Targeted therapeutic injections

Interventional EUS procedures

Minimally invasive surgical techniques

Personalised medicine

The role of the EUS in personalised medicine:

Molecular marker analysis

Genetic profiling

Therapy-response prediction

Precision oncology support

Endomedix's role in the development of EUS

Innovative companies like Endomedix are constantly working to improve EUS technology. Their developments focus on areas such as:

Tool development:

Designing more ergonomic endoscopes

Ensuring better image quality

Easier to use

Software innovation:

Intelligent image analysis algorithms

Automatic measurement functions

Reporting systems

Educational materials:

Multimedia learning materials

Virtual reality-based training

Online training platforms

Frequently asked questions

Is the EUS test painful?

The EUS test is usually not painful as it is done in sedation. Patients sleep during the test and wake up only after the effects of sedation have worn off. Minor discomforts such as sore throat or bloating may occur, but these disappear within a short time.

How long does an EUS test take?

An average diagnostic EUS test takes 30-60 minutes. If sampling is also required, the duration of the test can be increased to 60-90 minutes. The exact duration depends on the area to be examined and the number of interventions required.

When will I get the results?

The basic results of the investigation are usually discussed immediately. If a histological sample has been taken, pathology results are available in 3-7 working days. The final report and treatment plan are discussed at a follow-up visit.

How often should the EUS test be repeated?

The need to repeat the EUS test depends on the underlying disease:

In cancer: every 3-6 months control

Benign cysts: yearly check-up

In inflammatory processes: depending on treatment response

Is there an alternative to the EUS test?

Although there are alternative methods of examination (CT, MRI, ERCP), EUS provides unique information in many cases. The most appropriate examination method is always chosen by the doctor according to the individual case.

Is EUS safe during pregnancy?

EUS testing during pregnancy is generally not recommended unless it is necessary to obtain vital diagnostic information. In such cases, the medical team will decide after careful consideration of the benefits and risks.

Conclusion: the place of EUS in modern medicine

Endoscopic ultrasound has revolutionised gastroenterological diagnostics. The unique combination of the technology - the visual capabilities of endoscopy and the depth resolution of ultrasound - provides a diagnostic accuracy that was previously unattainable.

For patients, this means they can get a more accurate diagnosis in a less invasive way. EUS-guided sampling allows histological evidence to be obtained without surgical intervention, significantly reducing the burden and risk for patients.

Technology is constantly evolving thanks to the work of innovative companies like Endomedix. AI-based image analysis, higher-resolution devices and the expansion of therapeutic applications are all designed to make patient care even more efficient and safer.

If your doctor recommends an EUS test, it is important to know that it is a safe and highly informative diagnostic method. The test will help you to get a more accurate diagnosis, which will form the basis for the most appropriate treatment plan.

Don't be afraid to ask your doctor any questions you have about the test. Being properly informed and prepared will help you to feel confident about attending the examination and getting the best care.