Assessment of Bowel Peristalsis Using Transabdominal Ultrasound

Technical Requirements for Peristalsis Assessment

The American College of Radiology recommends a systematic survey pattern of the entire bowel with graded compression technique using a high-frequency linear transducer (5-17 MHz) for assessing bowel peristalsis 1, 2
Patient preparation with a fasting period of 4-6 hours is recommended to reduce bowel gas that may interfere with visualization, as suggested by the European Crohn's and Colitis Organisation 3
Administration of spasmolytic agents should be avoided as they may interfere with the real-time assessment of bowel peristalsis, according to the European Crohn's and Colitis Organisation 3, 4
Harmonic imaging should be activated when available, as this improves delineation of the bowel wall, as recommended by the European Crohn's and Colitis Organisation 4

The American College of Radiology states that ultrasound allows for real-time assessment of bowel pliability and peristalsis, which is crucial for evaluating bowel motility disorders 1, 5, 2

The American College of Radiology notes that patient factors such as obesity and large amounts of shadowing gas may preclude adequate compression with the ultrasound probe or obscure bowel, preventing optimal examination 1, 2
Ultrasound is most successful in non-obese patients due to its technical limitations, as reported by the European Crohn's and Colitis Organisation 3

The European Crohn's and Colitis Organisation suggests that color Doppler or power Doppler can be used to evaluate bowel wall vascularity, which may provide additional information about bowel pathology 3, 4
Small intestine contrast ultrasonography using oral contrast agents can improve visualization of the bowel wall and increase disease detection, according to the European Crohn's and Colitis Organisation 4
Ultrasound elastography is an evolving technique that can help differentiate between fibrotic and inflammatory bowel conditions, as reported by the European Crohn's and Colitis Organisation 3, 4

Ultrasound can identify paralytic ileus by showing dilated bowel loops (>2.5 cm) with decreased or absent peristalsis 6
The American College of Radiology suggests that ultrasound has 90% sensitivity and 96% specificity for detecting bowel obstruction, including paralytic ileus 6

Patient preparation with a fasting period of 4-6 hours is recommended to reduce bowel gas that may interfere with visualization 7
Systematic interrogation of the small bowel and colon using gentle graded compression technique is essential 7
Administration of spasmolytic agents should be avoided as they may interfere with the real-time assessment of bowel peristalsis 7
Ultrasound is most successful in non-obese patients due to its technical limitations 7

Ultrasound can be performed at the bedside, making it particularly valuable for critically ill patients 8
It allows for real-time assessment of bowel pliability and peristalsis, which is crucial for diagnosing paralytic ileus 9

Gas-filled loops of bowel, commonly present in postoperative ileus, may obscure underlying pathology 8
The sensitivity of ultrasound is particularly operator-dependent 8
Patient factors such as obesity and guarding may preclude adequate compression with the ultrasound probe 9
The American College of Radiology notes that CT is superior to ultrasound in terms of providing information about the underlying cause of bowel obstruction 6, 10