Abdominal Ultrasound: The Key to Understanding Your Health

An abdominal ultrasound is a non-invasive and safe diagnostic method that allows for the assessment of the condition of internal organs located in the abdominal cavity. Due to its accessibility, lack of radiation exposure, and high diagnostic value, ultrasound is one of the most frequently prescribed examinations in modern medicine. It helps doctors detect a wide range of diseases at early stages, monitor the progress of treatment, and assess the consequences of injuries.

What does an abdominal ultrasound show?

During an abdominal ultrasound, the doctor evaluates the size, shape, structure, and position of organs such as:

• Liver
• Gallbladder and bile ducts
• Pancreas
• Spleen
• Kidneys and adrenal glands (partially)
• Large blood vessels (aorta, inferior vena cava)
• Bladder (if necessary)

The examination allows for the detection of various pathologies, including inflammatory processes, neoplasms, cysts, stones, developmental anomalies, and the consequences of injuries. Modern ultrasound technologies are constantly evolving, expanding diagnostic capabilities.

Detection of free air and acute conditions

Ultrasound of the right upper quadrant of the abdomen has high sensitivity and speed in diagnosing pneumoperitoneum – the presence of free air in the abdominal cavity, which often indicates a rupture of a hollow organ. During such an examination, characteristic signs can be identified, such as an enhanced peritoneal stripe, reverberation artifacts, and "ring down" artifacts [2]. It is important to note that sometimes these signs may be missed on a formal ultrasound but are confirmed by other methods, such as radiography or computed tomography [2]. Ultrasound is also a valuable tool for excluding other acute conditions, such as acute cholecystitis, which may have similar symptoms [2].

Diagnosis and staging of peptic ulcer disease

Gastroscopy is traditionally used to assess the condition of the stomach and duodenum. However, studies show that oral contrast-enhanced ultrasonography (OCUS) of the stomach can be an effective method for the diagnosis and staging of benign peptic ulcers. OCUS demonstrates results comparable to gastroscopy and can be considered an alternative method, especially useful for dynamic monitoring of the ulcer healing process [6].

Assessment of postoperative complications

Abdominal ultrasound plays an important role in monitoring patients after surgical interventions. For example, after bariatric surgeries, such as Roux-en-Y gastric bypass (RYGB), rare but serious complications can occur. One of these is the incorrect Roux-en-O configuration, where the biliopancreatic limb is mistakenly connected to the gastric pouch, leading to functional obstruction and bile reflux. Ultrasound can be part of a comprehensive diagnostic approach for the early detection of such complications, which is critical for timely treatment and the prevention of serious consequences [1].

How to prepare for an abdominal ultrasound?

Proper preparation for an abdominal ultrasound is crucial for obtaining accurate and informative results. The main goal of preparation is to minimize the amount of gas in the intestines, which can hinder the visualization of organs.

• Fasting: The examination is performed strictly on an empty stomach. It is recommended to refrain from eating for 6-8 hours before the procedure. If the ultrasound is scheduled for the second half of the day, a light breakfast is allowed no later than 6 hours before the examination.
• Avoid gas-producing foods: 2-3 days before the ultrasound, exclude foods that contribute to increased gas production from your diet: legumes, fresh vegetables and fruits, black bread, dairy products, carbonated drinks, and alcohol.
• Medication intake: Upon a doctor's recommendation, you can take medications that reduce gas production (e.g., activated charcoal or simethicone) 1-2 days before the examination and on the morning of the ultrasound.
• Avoid smoking and chewing gum: It is not recommended to smoke or chew gum immediately before the examination, as this can lead to swallowing air.
• Hydration: You may drink plain, non-carbonated water, but in moderation.

Advantages and limitations of the method

Abdominal ultrasound has a number of undeniable advantages:

• Safety: The absence of ionizing radiation makes it safe for repeated use, including for pregnant women and children.
• Non-invasiveness: The procedure is painless and does not require surgical intervention.
• Accessibility: Ultrasound is widely available and relatively inexpensive.
• Dynamism: It allows for the assessment of organ movement and blood flow in real-time.

However, like any method, ultrasound has its limitations:

• Operator dependence: The quality of the examination largely depends on the experience and qualifications of the doctor performing the ultrasound.
• Gas production: Excess gas in the intestines can significantly impair organ visualization.
• Obesity: In patients with severe obesity, visualization of deeply located organs may be difficult [8].
• Certain structures: Ultrasound is not always effective for assessing hollow organs (except for the stomach with contrast [6]) or bone structures.

Despite these limitations, abdominal ultrasound remains one of the primary and most valuable diagnostic tools in modern medicine, providing important information for making a diagnosis and choosing a treatment strategy.

Sources

• [1] When "Y" becomes "O": a review of the Roux-en-O complication after Roux-en-Y gastric bypass — incidence, diagnosis, treatment, and prevention. https://pubmed.ncbi.nlm.nih.gov/42014569/
• [2] A-lines under the diaphragm – a case report of occult pneumoperitoneum. https://pubmed.ncbi.nlm.nih.gov/42559542/
• [6] The value of oral contrast-enhanced ultrasonography of the stomach in the diagnosis and staging of benign peptic ulcer. https://pubmed.ncbi.nlm.nih.gov/39075113/
• [8] Improved assessment of coronary artery disease in obese patients using positron emission tomography of the myocardium with flurpiridaz F-18 perfusion imaging: a pre-specified sub-analysis of the phase 3 AURORA study. https://pubmed.ncbi.nlm.nih.gov/42128226/

The information provided in this article is for reference purposes only and should not be used for self-diagnosis or self-treatment. Always consult a qualified physician for an accurate diagnosis and the prescription of appropriate treatment.