A Vital Sign For Postoperative Digestive Health

More Than A Gut Feeling

PrevisEA is a noninvasive, easy-to-use device that analyzes intestinal sounds for a validated acoustic biomarker of digestive health which is displayed as the Previs™ Index.1 The device is placed on the patient’s abdomen within one hour of surgery completion. At postoperative hour 12, the Previs Index displays “High Risk” or “Low Risk”. “High Risk” indicates that digestive health is likely insufficient to support early oral refeeding and the patient is likely to develop gastrointestinal impairment (GII) mostly commonly associated with postoperative ileus or less frequently due other causes.“Low Risk” indicates that digestive health can likely support early oral refeeding without subsequent GII. In PrevisEA clinical trials, GII was defined as vomiting, need for nasogastric tube insertion or a physician-ordered reversal of diet greater than 24 hours after completion of surgery.

  1. Hrabe, J. et al. (October 2019).  Prospective Analysis of an Acoustic Biomarker for Successful Early Oral Re-Feeding after Major Abdominal Surgery [Abstract]. Abstract retrieved from https://journals.lww.com/journalacs/Citation/2019/10002/Prospective_Analysis_of_an_Acoustic_Biomarker_for.26.aspx
  2. Kim et al. Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A, 24(8), 543–549.

Easy to Use

previs placement


Place Device

PrevisEA™ is applied to any quadrant of the abdomen within one hour of the completion of surgery.                                                                        


Power On

Once activated, PrevisEA listens for a validated acoustic biomarker.


Results In 24hrs

The Previs™ Index determines if digestive health is sufficient to support early oral refeeding and early discharge or is at risk for GII.


PrevisEA analyzes intestinal sounds for a validated acoustic biomarker of digestive health which is displayed as the Previs™ Index. This biomarker reflects whether the patient is at risk for GII. This assists in optimizing length of stay and may avoid unnecessary readmissions.

The Previs



PrevisEA uses a proprietary proprietary algorithm to detect and quantify a validated acoustic biomarker to assess the digestive health of patients. The result of this algorithm at postoperative hour 12 is the patient’s Previs Index. The Previs Index is compared to a predetermined threshold to determine if the patient’s postoperative digestive health puts them at risk for developing gastrointestinal impairment, 2–7 days after surgery.

Precision Medicine in Postoperative Care


PrevisEA uses an acoustic biomarker to determine the abnormal postoperative digestive health of a patient, such as gastrointestinal impairment (GII)


PrevisEA helps determine if the patient can successfully be re-fed on the day of surgery


PrevisEA helps determine when the patient successfully be discharged

Why PrevisEA?

  • Determines individual patient risk of GII 

  • Risk-based standardization of re-feeding and discharge strategies using precision medicine, which may:

    • Assist in determining if early oral refeeding and early discharge are appropriate
    • Optimize length of stay based individual patient risk of GII
    • Reduce readmissions, improve patient outcomes, and lower cost of care
    • Noninvasive, easy to use