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Implementing Precision Medicine and Artificial Intelligence in Plastic Surgery: Concepts and Future Prospects

Kim, You J., BS*; Kelley, Brian P., MD†,‡; Nasser, Jacob S., BS*; Chung, Kevin C., MD, MS§

Plastic and Reconstructive Surgery – Global Open: March 2019 - Volume 7 - Issue 3 - p e2113
doi: 10.1097/GOX.0000000000002113
Special Topic
Open
United States

Summary: Precision medicine, or the individualization of evidence-based medicine, is forthcoming. As surgeons, we must be prepared for the integration of patient and system factors. Plastic surgeons regard themselves as innovators and early adopters. As such, we need our adaptability now more than ever to implement digital advancements and precision medicine into our practices. The integration of artificial intelligence (AI) technology and the capture of big data techniques should foster the next great leaps in medicine and surgery, allowing us to capture the detailed minutiae of precision medicine. The algorithmic process of artificial neural networks will guide large-scale analysis of data, including features such as pattern recognition and rapid quantification, to organize and distribute data to surgeons seamlessly. This vast digital collection of information, commonly termed “big data,” is only one potential application of AI. By incorporating big data, the cognitive abilities of a surgeon can be complemented by the computer to improve patient-centered care. Furthermore, the use of AI will provide individual patients with increased access to the broadening world of precision medicine. Therefore, plastic surgeons must learn how to use AI within the contexts of our practices to keep up with an evolving field in medicine. Although rudimentary in its practice, we present a glimpse of the potential applications of AI in plastic surgery to incorporate the practice of precision medicine into the care that we deliver.

From the *Section of Plastic Surgery, Department of Surgery, University of Michigan Medical School, Ann Arbor, Mich.

Institute for Reconstructive Plastic Surgery of Central Texas, Seton Ascension Healthcare, Austin, Tex.

Dell Seton Medical Center at the University of Texas, Austin, Tex.

§Department of Surgery, Section of Plastic Surgery, Assistant Dean for Faculty Affairs, University of Michigan Medical School, Ann Arbor, Mich.

Published online 11 March 2019.

Received for publication November 1, 2018; accepted November 28, 2018.

Supported by a Midcareer Investigator Award in Patient-Oriented Research (2 K24-AR053120-06) to Kevin C. Chung.

The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Disclosure: The authors have no financial interest to declare in relation to the content of this article.

Kevin C. Chung, MD, MS, Section of Plastic Surgery, The University of Michigan Health System, 1500 E. Medical Center Drive, 2130 Taubman Center, SPC 5340, Ann Arbor, MI 48109, E-mail: kecchung@med.umich.edu

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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INTRODUCTION

As technology expands and our knowledge of biological processes increases, physicians must incorporate and synthesize an overwhelming amount of patient and medical data quickly and efficiently. This has presented challenges to busy medical providers. However, technology in the form of artificial intelligence (AI) machines and convenient user interfaces may ameliorate this problem by enhancing the practice of precision medicine. National investments in AI have already been initiated, but we are falling behind. In 2016, China opened an AI laboratory that focused on the development of AI-related technology, such as “machine learning, speech recognition, natural language processing, and computer vision.”1 Their advancements in AI applications have already made its way into the industry for online gaming and social services.1 In late June, the U.S. Pentagon made an announcement for the creation of the Joint Artificial Intelligence Center, which would facilitate numerous AI-related projects.2 This center would be supported by the U.S. Department of Defense, estimating a cost of $2 billion over 5 years.2 The national awareness of AI’s importance is certainly growing, now it is time to advocate for and demonstrate its application in healthcare.

Precision medicine is the individualization of evidence-based medicine, particularly through the incorporation of genetic data. The practice of precision medicine enables physicians to move away from traditional shotgun approaches to health care and provide more accurate, individualized treatment and prevention strategies.3 The shift to precision medicine integrates a diverse array of patient-specific data, such as environmental influences, lifestyle, and genetic variability.4 However, as a key component of individualized medicine, precision medicine will require powerful tools for this technology to be applied to the general population. The smart processing power of AI may be the answer to sort through the vast amount of applicable data being produced.5,6 In essence, AI is the ability of machines to study algorithms to perform cognitive functions, such as complex data analysis and interpretation.7 Although physicians can interpret these data manually, using thinking machines instead may provide a quicker, more efficient analysis, giving the physician instant feedback on active patient processes.6 Physicians will need to become quick adopters of this technology to keep up with the ever-expanding medical knowledge and to best incorporate patient-specific precision medicine concepts into their practices.3

Plastic surgeons are innovators and are frequently at the forefront of novel advancements in medicine. From the development of skin grafts to transplantation, the field of plastic and reconstructive surgery has grown tremendously because of our ability to incorporate new technologies rapidly and successfully.8,9 The plastic surgeon’s ability to be “plastic” will enable us to fully capture the potential of thinking machines. In recent years, AI has been integrated into many fields that require imaging, including radiology and pathology.10–12 For instance, AI has provided radiologists with “pre-screened images and identified features” to minimize their workload and focus their diagnostic ability.10 We envision that when the field of plastic surgery embraces big data, the cognition involved in patient diagnosis, surgical planning, and outcome assessment may be accomplished by the computer.6

AI and precision medicine are becoming burgeoning tools in healthcare, and the computerization of intelligence will afford us incredible computational power and promise to revolutionize medicine.5 AI technology already has started to influence the field of plastic surgery in the form of Snapchat. Using AI imaging techniques to recognize facial features, Snapchat places filters on users’ faces to alter their appearance.13 This AI advancement has led to the recent phenomena of “Snapchat dysmorphia,” which has patients seeking cosmetic surgery to resemble their filtered selfies.13 AI technology is emerging as an important tool in society, and we, as plastic surgeons, cannot ignore its presence. In this Special Topics article, we will focus on how big data in AI can be used to enhance the practice of precision medicine in plastic and reconstructive surgery.6 Our objectives are to (1) summarize the role of big data and precision medicine, (2) discuss potential clinical applications in plastic surgery, and (3) present future directions to guide the incorporation of AI to the field of plastic surgery.

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BIG DATA AND PRECISION MEDICINE

Precision medicine has the potential to revolutionize healthcare by treating patients as their own unique entity.14 The practice of precision medicine extends beyond traditional, population-based medicine and considers an individual’s unique genetic and environmental components (Fig. 1).4 For example, instead of assigning a common treatment for a certain disease, oncologists now analyze a patient’s biopsy tissue for a panel of genetic variants, which enables a more reliable prediction of the patient’s response to a particular treatment.15 With the availability of digital health records, at-home genetic screening, and demographic data, precision medicine may be implemented in a much broader format. Furthermore, big data techniques can enhance the practice of precision medicine with quick analysis, including rapid quantification of data and pattern recognition.6 Not only does this expand the capacity for information storage, but it enhances the ability to analyze, interpret, and make decisions with one click of a button. Figure 2 depicts how big data analytics can be used to implement precision medicine in clinical care.

Fig. 1.

Fig. 1.

Fig. 2.

Fig. 2.

Current technology in the form of wearable health-monitoring devices, such as Apple Watches, has the potential to hold a sheer volume of health data, such as heart rate and blood pressure. The most recent advancement of the Apple Watch will feature an application that can generate an electrocardiogram to be shared with a doctor at any time.16 Although these advances have the potential to be used for personal purposes, they will also contribute an immense amount of data to researchers. For instance, Stanford Medicine has partnered with Apple to use the data that are collected via the Apple Heart Study application to identify and notify patients of irregular heart rhythms.17 Not only will this study alert participants of potential serious heart conditions, but it will contribute a large amount of data to be used as “big data.”17 In addition, a large source of big data is electronic health records (EHRs). The intended purpose of EHRs is to assist in the rapid retrieval of information and to augment skills such as patient–physician communication.18–20 Although EHRs can theoretically provide instant and potentially organized access to patient information, the vast amount of information embedded into these digital records is often difficult to sort and apply expediently. Thus, the integration of big data analytics, such as artificial neural networks (ANNs), could provide a quick analysis of data to provide an output that is coherent and meaningful.7 ANNs are computing systems that mimic the biological neural network of a human brain, processing signals and making connections within data.7 ANNs use an algorithm to quantify and organize a set of data to recognize patterns that otherwise would be missed by a human.7Figure 3 demonstrates the process of ANNs, showing the input, hidden, and output layers. The input layer represents the data that are inserted into the model, whereas the output layer represents the predictions that are made by the model. Most importantly, the hidden layer represents the algorithmic layer that recognizes any patterns within the data.6 Researchers in the field of biomedicine have already integrated big data analytics to extract, summarize, and interpret knowledge from rapidly generated data, which has improved accuracy in predictive modeling.21 Introducing this digital technology to surgery would not only give surgeons quick access to the information stored in EHRs, but they will have insight into any patterns recognized by ANNs to aid them in their decision-making process.

Fig. 3.

Fig. 3.

Within the past few years, AI has established a niche in different areas in the field of surgery.7 For example, researchers have investigated the use of robotics and AI to assist surgeons in keyhole neurosurgery.22 Furthermore, a robotic system equipped with AI algorithms was designed to perform ex vivo and in vivo bowel anastomosis.23 This study showed that surgical tasks that require human skills, such as dexterity and cognition, can indeed be programmed and executed with robotic systems.23 Additionally, surgeons have used AI-assisted surgery to perform sutures on small blood vessels in a patient who was suffering from lymphedema.24 The robot, manually controlled by a surgeon, demonstrated its ability to make precise movements and stabilize any tremors in the surgeon’s movements.24 Although these techniques have not yet been applied to plastic surgery, this does not mean we cannot imagine AI-assisted surgery in the procedures that we perform. As plastic surgeons, it is now time for us to leverage our creativity to embrace these technological developments to advance our field and provide better care for our patients.

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POTENTIAL CLINICAL APPLICATIONS IN PLASTIC SURGERY

Breast Surgery

For plastic surgery procedures such as breast augmentation, breast reduction, and breast cancer reconstruction, precision medicine can provide patient-specific risks for breast-related diseases. AI can assist in the decision-making process that incorporates breast cancer prevention, surgical options, and postoperative monitoring. In fact, researchers have already investigated the integration of AI in breast cancer prevention through image detection.25 For example, intelligent imaging has been used to differentiate high-risk from low-risk breast lesions, considering lesion characteristics, in addition to patient-specific information, such as family history and environmental factors.25 Furthermore, the use of intelligent imaging has shown astounding abilities to process a vast amount of images with a reduced rate of error.26,27 For example, in a detection task for metastatic breast cancer in whole slide images of lymph node biopsies, researchers showed that the integration of machine learning reduced the error rate from 3.4% (predictions of a pathologist alone) to 0.52% (predictions of a machine learning algorithm and a pathologist).26 The observed reduction in error rate demonstrated the power of integrating AI to improve diagnostic accuracy.26 However, this technology is not yet routinely used in the assessment of risks in augmentation or reduction mammoplasty patients.

The recent emergence of breast implant–associated anaplastic large cell lymphoma (BIA-ALCL) as a concern is an excellent example of risk mitigation through this technology.28 In 2008, researchers reported an increased risk for BIA-ALCL for patients with breast implants.28 Previous studies have examined the absolute risk of the disease, ranging from 1 in 3,000,000 to 500,000 patients with breast implants per year, and its association with textured breast implants.29–31 However, little is known about the disease because of its low risk and rarity. AI technology in the form of big data analytics, such as ANNs, could provide a gateway to collect, organize, and distribute data on BIA-ALCL. From 2008 to 2015, the number of unique cases of BIA-ALCL increased from 5 to 173.28 As more information is collected, machines could be used to efficiently store these data in one place, making the information accessible to thousands of plastic surgeons worldwide to provide a better understanding of the disease, such as the etiology and risk of the disease. Furthermore, ANNs could analyze these data to recognize patterns in the genetic predispositions or environmental status of patients with BIA-ALCL to assist in risk stratification. A task that would take humans months or even years to accomplish, ANNs could quickly identify patients who are at a higher risk of developing BIA-ALCL to guide surgeons early on toward the right steps for treatment.

Overdiagnosis of breast cancer on screening mammography may also potentially be minimized with machine intelligence.25 Recent studies have used convolutional neural networks (CNNs) as a machine learning model in the context of breast screening.32,33 Although CNNs are more common in the context of natural images, such as facial recognition tasks, its effectiveness has been proven recently in its ability to learn automatically and distinguish differences among images.34,35 For instance, instead of predefining a certain structure in an image as “benign,” CNNs detect differences between benign and malignant cells to distinguish between the two.35 However, with the overall success of CNNs to detect cancerous cells, critics are concerned that AI technology will replace certain healthcare jobs in the near future.36 Although this is a possibility, AI technology is not meant to replace, but simply to augment the skills of a physician.5 Not only does this technology improve overall efficiency and productivity, but its automatic learning ability can mitigate human errors in its assessments.35

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Wound Care

Treatment decisions regarding wound care require an assessment of wound characteristics, such as size and site, along with patient-specific factors, including skin type, genetic information, and lifestyle. The ability to create an effective and precise surgical plan in a reasonable amount of time is integral in achieving optimal outcomes for patients. Although the severity of certain injuries is obvious to the human eye, the use of machine intelligence could make this decision in a quicker, more-efficient manner. By pairing wound images to precise measurements of the patient’s body, a thinking machine could predict the percentage of affected tissue.6 In fact, researchers in Italy have already created a medical device to acquire and process wound images through AI algorithms with 94% accuracy.37 This technology could be further applied to predict wound healing time.38 The advancement of this application will enable surgeons to formulate individualized treatment decisions, avoid wound infection, and improve patient care.

Furthermore, AI-assisted evaluation of computed tomography (CT) angiograms, along with other smart imaging techniques, could aid surgeons in the design of surgical flaps. Current technology requires surgeons to analyze 3-dimensional (3D) images in slices, sacrificing time and accuracy in their ability to see the internal structure of the human body.39 Whereas radiologists have to divide CT angiogram images into 64 different slices for accurate prediction, a computer could analyze all slides of a 3D imaging specimen simultaneously.39 Additionally, plastic surgeons generally use the same flap design when a specific flap procedure is performed. However, the quick, integrative thinking abilities of AI could aid surgeons in a design approach that is customizable to each individual patient.

Wound infections on the cutaneous level could spread into the bone tissue to cause progressive inflammation of the bone, leading to osteomyelitis.40 There are many challenges posed during the diagnostic period for osteomyelitis because of the duration that it takes for plain radiographic images to show any sort of osseous lesion.41 For example, a 30%–50% reduction of bone density must occur for radiographic images to detect any change.41 Therefore, more expensive radiographic imaging techniques, such as CT, magnetic resonance imaging, and scintigraphy, have been used for an earlier, more-accurate diagnosis.42 AI-assisted evaluation of radiographic images could minimize the time that it takes for osteomyelitis to be evident on a radiographic image. For instance, radiologists have applied temporal subtraction, an element of computer-aided diag nosis, to enhance interval changes between two radiologic images.12 Instead of requiring up to a 50% reduction in bone density, the integration of this technology could increase the sensitivity of this technique to make an earlier, potentially life-saving diagnosis of osteomyelitis.

AI technology could also be applied outside of the hospital setting, even in the patient’s own home. For example, diabetic patients now have the option of managing their glucose levels and insulin intake with the use of one simple device.43 From this device, the information enters a digital cloud of data, which can be accessed by their primary care physician without the need for a clinic visit.43 This use of telecommunication technology could be applied to the management of burn wounds. The patient could chart a daily photograph of the wound into the system. These images could then be processed for changes by the computer, including changes in size, color, and potentially even spectrophotography, to assess tissue oximetry.6,44 Furthermore, precise monitoring through the use of photographs can be applied to other areas in plastic surgery, especially esthetic surgery. Plastic surgeons could use patient selfies to monitor the progress of a patient’s face after a procedure, providing the surgeon with real-time updates while saving the patient a visit to the clinic.

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Craniofacial Surgery: Craniosynostosis

Craniosynostosis is one of the most common craniofacial malformations encountered by plastic surgeons.45 Of the 90 known syndromes with craniosynostosis, approximately 50 have a known genetic basis.45 However, the practice of precision medicine goes beyond the genetic variability among patients. Both genetic and environmental factors are believed to play a role in the pathogenesis of craniosynostosis.46 A major limitation lies in the scarcity of data that are collected on the outcomes of cases involving craniosynostosis. Through more precise data collection, researchers and surgeons will be able to have a better understanding of the genetic and environmental influences of this malformation, ultimately improving the surgical care that patients receive.

Historically, image detection methods, such as radiography and ultrasonography, have been applied to confirm the correct diagnosis of craniosynostosis.47,48 Now, AI techniques could be implemented to integrate the various images to improve and assist in surgical planning. This is particularly true for syndromic conditions, for which recurrent deformities may be more frequent because of the inherent pathophysiology in bone development. Although it has not been applied clinically, this technology has already contributed to a novel model of “precision liver surgery.”49 It has been discussed that liver imaging can determine disease etiology and guide surgical interventions through 3D visualization. Liver imaging can provide surgeons with the anatomy of a liver, including the location of various vessels and lesions.49 Applying a similar technology to give a 3D representation of a patient’s skull, AI technology could improve craniosynostosis surgery to become accustomed to each, individual patient.

Furthermore, plastic surgeons could use ANNs to predict postoperative complications after craniofacial surgery, similar to how ANNs have been used to predict recurrent cardiovascular disease.50 Syndromic craniosynostosis may lead to recurrent cranial abnormalities because bone may continue to grow abnormally despite corrective surgery. In such cases, both AI and precision medicine may improve medical augmentation of surgery to optimize postoperative outcomes. Additionally, image analysis from big data may help to customize cranial remodeling to best accommodate individual children.

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Other Applications in Plastic Surgery

The efficient use of anesthesia and postoperative pain management are fundamental factors in optimizing outcomes for surgical patients.51 Although general anesthesia is commonly used in many surgeries, the risks that accompany its use must be considered on a patient-by-patient basis.51 In addition to intraoperative pain management, the relief of postoperative pain has become a vital factor in surgical outcomes.51 Postoperative pain has been recognized as a common reason for wasteful healthcare spending for inadequate management of care transitions, with an estimated spending of $25–$45 billion in 2011.52 Identifying patients who may be at higher risk for visiting the emergency department due to inadequate postoperative pain may reduce wasteful spending by providing better preoperative education. This same technology could be used to identify patients who are at a higher risk for opioid addiction, which is now considered to be an epidemic in the United States.53,54 AI-assisted technology could use precise patient data, such as prior opioid use, family history of addiction, and tolerance, to stratify the risk involved in opioid use for surgical patients.

AI could also be used to aid in postoperative monitoring. The use of telemedicine to communicate with surgeons digitally can save patients’ both time and money.55 Home diagnostics of the patient’s vital signs, in addition to photograph or video documentation of the surgical site, are variables that could be charted readily at home by the patient. The thinking machine could then report these results while highlighting any areas of concern. For instance, the computer could detect changes in the status of closed incisions to monitor for infection.44 Although in-person clinic visits are sometimes required, a daily update from the patient’s own home could provide surgeons with frequent, real-time updates of a patient’s postoperative course.

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CONCLUSIONS

From the use of intelligent imaging to the integration of big data techniques, the cognitive skills of physicians have become computerized to be quicker, more efficient, and more precise. However, all technological advancements such as AI have critics and limitations, especially in the field of surgery. Although precision medicine and AI are emerging topics in the field of medicine, the clinical examples that are presented in this article are simply to set a primer for its application. Furthermore, for AI algorithms to make accurate predictions, the data that are input must also be accurate and diverse. The collaboration of researchers and surgeons is imperative in the advancement of this technology in medicine. Thus, surgeons must understand the importance of accuracy and diversity within their own data.7 Furthermore, the uncertainty behind the hidden layer of ANNs is a concern that has risen among many researchers. Many refer to the hidden layer of the ANN as the “black box.”7 It is hoped that, as we expand our knowledge of AI, we will have a better understanding of the algorithmic process behind these neural networks.

AI in the form of big data analytics will augment the cognitive decisions of plastic surgeons, whereas AI-assisted surgery will refine their surgical skills, mitigating human error and promoting precision. By advocating for the use of AI in our field, we will truly defend our label as innovators shaping the field of medicine. With more big data and policy focused on implementing various applications of machine intelligence, the future of AI in plastic surgery will be possible.

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Copyright © 2019 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of The American Society of Plastic Surgeons.