Digital Twins: The Future of Personalized Medicine and Surgery

The concept of a “digital twin”—a virtual replica of a patient’s anatomy and physiological processes—is rapidly evolving from science fiction to a tangible reality in healthcare. Leading the charge is Dr. John Pandolfino, chief of Gastroenterology and Hepatology and director of the Northwestern Medicine Digestive Health Institute, who is pioneering the use of digital twins to improve surgical outcomes for patients with swallowing disorders like achalasia.

Understanding Achalasia and the Role of Digital Twins

Achalasia is a rare disorder that affects the esophagus, the tube connecting the mouth to the stomach. Normally, the esophagus contracts to move food down and a lower esophageal sphincter relaxes to allow food to enter the stomach. In achalasia, the lower esophageal sphincter fails to relax, causing food and liquids to accumulate in the esophagus. Dr. Pandolfino explains that this can lead to a life-threatening situation where patients perceive like they are “drowning on their own saliva and food.”

To address this, surgeons often perform a myotomy, a procedure that cuts the esophageal muscle. However, determining the optimal approach—how much to cut, whether to include an anti-reflux procedure—can be challenging. This is where digital twins arrive in. Dr. Pandolfino’s team has developed dimensionally accurate virtual models of the esophagus to simulate different surgical approaches and predict patient-specific outcomes.

How Digital Twins are Developed and Tested

The digital twins developed by Dr. Pandolfino’s team aren’t fully comprehensive simulations of all biological processes. Instead, they focus on recreating the pressure and motion of the esophagus. These virtual models are trained using data from numerous scenarios, allowing them to predict which surgical approach will be most effective and identify patients at higher risk of complications, such as the development of a diverticulum (a weakening and ballooning of the esophageal wall).

Currently, a 400-person clinical trial is underway to compare the standard surgical approach with one guided by the digital twin. The goal is to demonstrate that the virtual esophagus can lead to fewer instances of reflux and diverticulum development. Researchers believe the virtual model has already proven their hypothesis mathematically.

The Future of Digital Twins in Medicine

While current digital twins primarily focus on the mechanical aspects of organs like the esophagus, the potential applications extend far beyond. Dr. Pandolfino envisions expanding this technology to other “pump-and-tube” systems in the body, such as the bladder, aorta, and even the heart. He notes that many organs share similar physiological principles—tubes with contractions and sphincters—making the core modeling approach adaptable.

Beyond surgery, digital twins could likewise have prognostic value, helping doctors predict when medications will become ineffective. For example, if a patient develops significant esophageal wall deformation, medications are unlikely to provide relief.

Reducing Animal Testing

One promising aspect of digital twin technology is its potential to reduce reliance on animal research, particularly in surgical planning. Dr. Pandolfino suggests that surgeons could use virtual simulations to test procedures before performing them on patients, eliminating the need for animal models. However, he acknowledges that digital twins are unlikely to replace animal testing for evaluating new compounds and their potential toxicity.

Expanding Capabilities: From Virtual to Tactile Twins

Looking further ahead, Dr. Pandolfino anticipates the development of “tactile twins”—physical models made from materials that accurately simulate the feel of real organs. This would allow surgeons to practice procedures in a realistic environment, enhancing their skills and preparedness. He emphasizes that the body often repeats functional patterns, meaning insights gained from studying one organ can be applied to others.

Dr. Pandolfino also believes this technology will lead to a better understanding of organ material properties and how they respond to stress and strain, ultimately improving surgical techniques and patient care. He highlights that conditions like gastroesophageal reflux disease (GERD) are often more related to anatomy and physiology than to excessive acid production, suggesting that a more nuanced understanding of these factors could lead to less invasive and more effective treatments.