The effectiveness of using virtual patient educational tools to improve medical students’ clinical reasoning skills: a systematic review

Use of virtual patient educational tools could fill the current gap in the teaching of clinical reasoning skills. However, there is a limited understanding of their effectiveness. The aim of this study was to synthesise the evidence to understand the effectiveness of virtual patient tools aimed at improving undergraduate medical students’ clinical reasoning skills. We searched MEDLINE, EMBASE, CINAHL, ERIC, Scopus, Web of Science and PsycINFO from 1990 to January 2022, to identify all experimental articles testing the effectiveness of virtual patient educational tools on medical students’ clinical reasoning skills. Quality of the articles was assessed using an adapted form of the MERSQI and the Newcastle–Ottawa Scale. A narrative synthesis summarised intervention features, how virtual patient tools were evaluated and reported effectiveness. The search revealed 8,186 articles, with 19 articles meeting the inclusion criteria. Average study quality was moderate (M = 6.5, SD = 2.7), with nearly half not reporting any measurement of validity or reliability for their clinical reasoning outcome measure (8/19, 42%). Eleven articles found a positive effect of virtual patient tools on reasoning (11/19, 58%). Four reported no significant effect and four reported mixed effects (4/19, 21%). Several domains of clinical reasoning were evaluated. Data gathering, ideas about diagnosis and patient management were more often found to improve after virtual patient use (34/47 analyses, 72%) than application of knowledge, flexibility in thinking and problem-solving (3/7 analyses, 43%). Using virtual patient tools could effectively complement current teaching especially if opportunities for face-to-face teaching or other methods are limited, as there was some evidence that virtual patient educational tools can improve undergraduate medical students’ clinical reasoning skills. Evaluations that measured more case specific clinical reasoning domains, such as data gathering, showed more consistent improvement than general measures like problem-solving. Case specific measures might be more sensitive to change given the context dependent nature of clinical reasoning. Consistent use of validated clinical reasoning measures is needed to enable a meta-analysis to estimate effectiveness.

Background It has been recommended that more explicit training should be provided in undergraduate medical education on applying clinical reasoning skills, to reduce the impact of future diagnostic errors and potential patient harm [1][2][3][4]. Clinical reasoning refers to the thought processes and steps involved in making a clinical judgement [2,5]. Clinical reasoning requires several complex cognitive skills and is a context dependent skill [2]. It is an evolving and cyclical process that involves applying medical knowledge, gathering necessary information from patients and other sources, interpreting (or reinterpreting) that information and problem formulation (or reformulation) [2,5]. To be proficient in clinical reasoning, clinicians need to also acquire the requisite knowledge and skills in reflective enquiry [2].
Currently, teaching of clinical reasoning in most medical schools in the UK remains a largely implicit component of small group tutorials, problem-based learning, clinical communication skills sessions, and clinical placements [3]. Making the teaching of these skills more explicit may help students to reflect on their skills, which many models of learning suggest is essential for improving skills [6,7]. Virtual patient educational tools are becoming increasingly popular in medical education and have been used to explicitly teach clinical reasoning skills [5,8,9]. They are defined as "A specific type of computerbased program that simulates real-life clinical scenarios; learners emulate the roles of health care providers to obtain a history, conduct a physical exam, and make diagnostic and therapeutic decisions". They allow students to practise clinical reasoning with realistic patients, in a safe environment [5,10]. They may also be particularly suited to providing training on clinical reasoning skills that require deliberate practice with a wide variety and large number of clinical cases. Indeed, many students may have limited contact with patients, where it is also not possible to pre-determine what range of presentations and problems students will meet [5]. Educational and cognitive theories, and empirical research also suggest that virtual patient educational tools could provide an ideal platform for developing clinical reasoning skills if they incorporate best practice features for simulationbased educational tools, in particular providing opportunities for feedback and reflection [6,7,10,11].
Previous systematic reviews and meta-analyses have indicated that virtual patient tools, can significantly improve clinical skills, such as clinical reasoning, for both health professionals and students from a range of disciplines [12][13][14][15][16][17]. Additionally, reviews have shown that virtual patients used in blended learning have been found to be effective at improving knowledge and skills [15,18]. However, given that clinical reasoning encompasses several cognitive skills, such as problem-solving and data gathering skills, it would also be useful to understand the impact of virtual patient tools on the different skills or domains of clinical reasoning that were measured, which previous reviews have not explored [12-14, 19, 20]. Furthermore, there has been limited information in previous reviews about whether best practice features for simulation-based educational tools were incorporated into virtual patient tools to improve clinical reasoning [21]. There have also been no sub-group analyses to show the specific effect of these interventions on the clinical reasoning skills of undergraduate medical students, who are likely to have different training needs and ways of learning compared to professionals [12][13][14].Thus, there is insufficient evidence for undergraduate medical educators to understand the impacts of virtual patient educational tools on the different domains of clinical reasoning for medical students [13,22]. Medical educators need current information on their effectiveness as the importance and place of online learning in medical education has changed substantially since the COVID-19 pandemic [19,20]. A timely review is also needed as online learning tools are evolving rapidly and the number of articles evaluating virtual patient tools is increasing year on year [9,15]. This review, therefore, aims to address the question "How effective are virtual patient educational tools at improving the clinical reasoning skills of undergraduate medical students and which domains of clinical reasoning do they affect?". Other objectives of this review were to: a) identify the use of empirically and theoretically informed intervention features in virtual patient tools, such as reflection; b) identify the outcome measures used to assess clinical reasoning skills.

Methods
This systematic review was conducted following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and the PRISMA checklist is available as Additional File 1; the review protocol was presented in RP's doctoral thesis [23].

Search strategy
We applied a search strategy for the following databases: MEDLINE, EMBASE, CINAHL, ERIC, Scopus, Web of Science and PsycINFO, from 1990 to July 2016 and the search was updated to include all articles up to January 2022. Further articles were identified by hand searching the reference lists of included articles. Search terms included a combination of subject headings and key word searches. The full search strategy used in MEDLINE is available as Additional File 2.

Study selection
One author (RP) screened all the articles retrieved from the search by title and abstract for eligibility of inclusion. Another author (APK) double screened a proportion of the abstracts (736/5,735, 13%,), with moderate agreement (Cohen's Kappa = 0.64) [24]. The approach taken was that if the first screener (RP) had any doubts, the articles were included for the second screener (APK) to screen. Most 'disagreements' were due to APK rejecting those that RP had included but with doubts (29/39, 74% of disagreements) than APK including those that RP rejected (10/39, 26%). Discrepancies were resolved in a consensus meeting and articles were included for full text screening if the abstract lacked enough detail to confirm eligibility. One of the authors (RP) screened all the full text articles and APK double screened a proportion of these articles (60/123, 49%), with moderate agreement (Cohen's Kappa = 0.65). Discrepancies were resolved in a consensus meeting with the wider team.

Data extraction
Data on study design, population, setting, delivery of intervention, outcomes, results, and limitations was extracted in an Excel spreadsheet. We also extracted data on the features that were included in the virtual patient tools, such as reflection and feedback. APK and SM piloted the data extraction form with two articles. RP extracted data from 11 articles included in the review, APK extracted data from seven and SM extracted data from one. All extractions were doublechecked by either RP, APK and SM; discrepancies were resolved in a consensus meeting.

Quality assessment
Three authors (RP, APK and SM) assessed the quality of the included articles independently. Quality was assessed using a checklist that incorporated items from two previously developed checklists, the Medical Education Research Study Quality Instrument (MER-SQI) and an adapted form of the Newcastle-Ottawa Scale (NOS), which have both been used in previous reviews in this area [14,22,25]. The two checklists were incorporated as the NOS was designed to identify aspects of quality related to potential biases in the study design and sample selection, and the MERSQI was designed to identify other aspects of quality, such as the validity and reliability of outcome measures. In addition, articles were given a point if they described how theory informed assessment of clinical reasoning skills or used a previously validated measure that was based on theory e.g., key features problems [26]. Articles could receive a score of up to 14, with scores ranging from 0-4 suggesting low quality, scores of 5-9 suggesting moderate quality and scores of 10-14 indicating high quality. Interventions that describe an educational method that explicitly teaches clinical reasoning skills and is an interactive computer simulation of real-life clinical scenarios between 'physicians' and 'patients' . The student should emulate the role of a clinician by undertaking various reasoning activities such as gathering data from the patient, interpreting information, or making diagnostic decisions [9]. Patient information could be presented in text or videos on the computer Excluded: high fidelity simulators, manikins, standardised patients, and decision support tools Comparator Teaching as usual e.g., no explicit clinical reasoning teaching or a comparison to an alternative method of delivering explicit clinical reasoning teaching e.g., tutorials, problem-based learning discussion groups often involving paper-based Articles from the year 1990, as this was when online learning was beginning to be described [14] Data analyses We conducted a narrative synthesis of the included articles to address the review objectives. We summarised the characteristics of the interventions to understand what features were included in virtual patient tools and how they were delivered. The study designs used to evaluate the virtual patient tools and the reported effectiveness of each intervention were also reported; Cohen's d effect size was calculated where possible. We also summarised the various clinical reasoning outcome measures used and grouped outcomes measured in each article into specific domains of clinical reasoning informed by the model of clinical reasoning by Higgs et al. [2] and author descriptions of the clinical reasoning outcomes they measured. The analysis of clinical reasoning domains was undertaken at the level of analyses, as articles often reported on more than one domain, and so each domain was included separately in the analysis. In all the articles it was possible to identify at least one domain of clinical reasoning that was measured. Most articles (14/19, 74%) used an aggregate score to represent several domains of clinical reasoning.

Study characteristics
The search strategy identified 8,186 records of which 19 were included in the review. See Fig. 1 for the PRISMA flow diagram of the number of articles included at each stage of the review. The most common study locations were Germany (7/19, 37%) and the USA (3/19, 16%; see Table 2). Most of the articles were published since 2010 (16/19, 84%). Table 2 describes the characteristics of the interventions.

Intervention features
There was a great variety of virtual patient tools that were used to improve reasoning; only two -MedU [27,28] and EMERGE [29,30]-were evaluated in more than one study. Just under half of the interventions (9/19, 47%) required the students to gather information from the virtual patient, and were more interactive, while 42% (8/19)   were less interactive and presented patients with the patient history already completed. There was not enough information in two articles to determine interactivity (2/19, 11%) [28,31]. Most of the interventions (16/19, 84%) required students to work individually rather than in groups. Those that were delivered in groups required students to work together to complete the case and make decisions. The clinical topic of the interventions varied; cardiology (5/19, 26%) followed by paediatrics and surgery were the most common topics (2/19, 11% respectively). The number of patient cases within the virtual patient tools ranged from 1-48, with two and three patient cases being the most common number (3/19, 16% respectively). The duration of the patient cases varied from approximately nine minutes to complete a case [32] to 10 h to complete one case (over several weeks) [33].
Most commonly students had multiple opportunities to use and complete the patient cases (16/19, 84%). Most interventions provided feedback to students on their performance (13/19, 68%). They did this in several ways including: providing the correct answers, providing feedback from experts on how they would have completed the case either via text or video, and discussing answers with a facilitator after completing a case. Reflection was explicitly described in one intervention where users were prompted to reflect during each patient case on their decisions and were required to complete open-ended reflection questions at the end of each case [34]. There were two interventions where the use of reflection was implied, but it was unclear from their description whether the activities were explicitly for reflection [35,36]. Table 3 describes the characteristics of the included articles including study design, outcome measures used and reported effectiveness. Just under half of the articles were RCTs (9/19, 47%), one was a feasibility RCT (1/19, 5%) [34]. A smaller proportion were non-randomised trials (3/19, 16%) [27,30,37] or single group pre-test and post-test design (6/19, 32%). Of those studies with a comparator (n = 13), over half of the evaluations (9/13, 69%) compared virtual patient tools to teaching as usual, which included no additional clinical reasoning teaching via any method. In these studies, teaching as usual comprised general clinical teaching via lectures, real patient examinations and small group discussions. Around a third of evaluations (4/13, 31%) compared virtual patient tools directly with an alternative method of explicit clinical reasoning training, which were all tutorials or small group discissions where the same case was discussed [28,30,33,38]. There was a wide variety of year groups that interventions were evaluated with, ranging from those in their 1 st year of medical school to those in their 6 th year. In most of the evaluations, participants were in their 3 rd or 4 th year of study (8/19, 42% respectively).

Outcome measures
Six domains of clinical reasoning were identified. Three domains reflected the underlying general cognitive processes required in clinical reasoning and these included: the application of knowledge of the clinical problem derived from theory or experience (3/19, 16%) [28,39,40]; flexibility in thinking about diagnoses [28,34] and problemsolving skills [38,41](2/19, 11% respectively). One domain reflected more case specific clinical reasoning processes that were measured via data gathering skills, including the relevance of patient examinations (7/19, 37%). Two domains measured the outcomes of the clinical reasoning process in specific cases by measuring the clinical judgements the students made. These included: ideas about diagnoses, including diagnostic accuracy (10/19, 53%), and ideas about patient management, including appropriateness of treatment plans or therapeutic decisions (7/19, 37%).

Quality of included articles
Additional file 3 gives a detailed breakdown of the quality of the included articles. The average quality was moderate (M = 6.5, SD = 2.7). Only three articles (3/19, 16%) were high quality [33,34,40], most were of moderate quality (13/19, 68%) and three were of low quality (3/19, 16%) [31,47,49]. Just over half of the articles (10/19, 53%) described how theory informed the evaluation, by either describing theoretical frameworks they used to assess clinical reasoning or using previously developed and validated measures of clinical reasoning. Only four articles (4/19, 21%) reported measuring three or more different types of validity and reliability [33,34,40,50] and nearly      half did not report any measurement of validity or reliability (8/19, 42%). Only two (2/19, 11%) articles reported that they selected students from more than one medical school [34,49]. Three articles (3/19, 16%) reported that the assessor of the outcome was blinded to group allocation. Just over a quarter (5/19, 26%) reported a power calculation, although this was not necessary to calculate for all study designs.

Effectiveness by domain of clinical reasoning measured and measurement
Data gathering, ideas about diagnoses and patient management were largely found to significantly improve after virtual patient use (34/47 analyses, 72%; Fig. 3). Application of knowledge, flexibility in thinking about diagnoses and problem-solving skills showed more mixed results, with less than half of these analyses showing significant improvement in these skills (3/7, 43% analyses).

Discussion
This review of published evaluations of virtual patient educational tools found there is some evidence that they can improve medical students' clinical reasoning. Improvements were more consistently reported for domains of clinical reasoning that were more case specific, such as ideas about diagnoses and data gathering, rather than more general reasoning processes, such as problem-solving.

Intervention features
This review illustrates the diversity in design, content, and delivery of virtual patient tools and the clinical context in which they are applied. Most virtual patient educational tools have been designed for individuals to complete. Many of the tools included features that educational theories and empirical research suggests are important to include in simulation-based learning, such as feedback, but relatively few reported how they facilitated reflection [32,[34][35][36]. A previous review exploring the impact of virtual patients on communication skills found that the inclusion of a pre-activity with a protocolinformed tutorial, post-activity of debrief or reflection, scaffolding and human feedback improved the effectiveness of the virtual patient tools [21]. Further consideration of how to facilitate reflection and other best practice features in virtual patient tools could allow them to be even more effective at developing reasoning skills [7,51,52]. There was also variety in the level of interactivity with the virtual patient tools, with half of the tools not requiring students to gather information from the patient. Previous research is inconclusive as to whether greater interactivity produces better learning outcomes [53]. Studies have shown greater interactivity can facilitate deeper learning and more engagement from users, but it can also increase cognitive load, which can interfere with learning [50,53]. However, virtual patient tools that allow for greater interactivity might be more helpful for educators to observe and assess clinical reasoning skills, as students can demonstrate a broader range of skills in real-time, such as data gathering.

Effectiveness
Our results largely concur with previous reviews that have found virtual patient tools are better than no intervention but might not be superior to other methods of explicitly teaching clinical reasoning, such as problem-based learning tutorials [12-15, 17, 18]. The benefits to using virtual patient tools are that they can be used in circumstances when face-to-face teaching is Fig. 2 Effectiveness of virtual patient tools by comparator, study design and quality not possible, e.g., due to a pandemic, or because access to patients is limited. Additionally, once upfront costs are covered, the cost of adapting and scaling up can be low. This review suggests that using virtual patient tools can effectively complement face-to-face teaching and as previous reviews have suggested, they could be a particularly useful tool for a blended learning approach to teaching [15,18]. This review provides useful evidence for medical educators to guide their decisions about using this technology, which may be especially attractive if there is no other explicit teaching of clinical reasoning skills in the curriculum. Further research is needed to understand the context in which different teaching methods are most effective and the feasibility of implementing into curricula, so that medical educators can make more informed decisions on educational methods.
This review showed some evidence that effectiveness might depend on the domains of clinical reasoning that the virtual patient tools were designed to address and how these were measured. Most articles evaluated the effects of virtual patient tools on domains of data gathering, ideas about diagnoses and patient management and many showed significant improvement in these domains. The application of knowledge about clinical problems and processes, flexibility in thinking about diagnoses and problem-solving skills were less commonly measured and showed less consistent improvement after virtual patient use. These findings could be due to issues with measuring different domains of clinical reasoning. Data gathering skills, ideas about diagnoses and patient management are domains that are related to students' judgements on specific cases. Therefore, they are easier to measure using patient cases and measures like the key feature problems, which are case specific and may be more sensitive to change immediately post intervention. In contrast, the application of knowledge, flexibility in thinking about diagnoses and problem-solving measures may be more related to the underlying cognitive processes of clinical reasoning. These general cognitive skills are less likely to vary over the short-term and measurements, such as the DTI, have not necessarily been designed to be sensitive enough to detect short-term changes in these skills [54,55]. Case specific outcomes may also be more appropriate for measuring clinical reasoning, as clinical reasoning is a skill that is context dependent [2]. We also found most articles reported aggregated effectiveness over several domains. Future research would benefit from defining the specific domains of clinical reasoning their virtual patient tool aims to improve and provide separate analyses for each aspect. Furthermore, a greater understanding of the psychometric properties of measures of clinical reasoning is needed to identify which domains of reasoning virtual patient tools can effectively teach students and over what timescales.

Limitations
It was not meaningful to conduct a meta-analysis to summarise the overall effectiveness of virtual patient tools on clinical reasoning due to the substantial heterogeneity in the design and content of the virtual patient tools, the measures of clinical reasoning and the characteristics of samples. Many articles developed their own measures of reasoning but with limited validation it was difficult to ascertain what they were measuring and how comparable they were to other measures. The findings of the review were limited by the lack of high-quality articles that were included. The review was updated in January 2022 and by this time the review authors' article on a virtual patient tool was eligible for inclusion. This was rated of high quality, and it is possible the authors were biased in their scoring of their own article. As found in previous reviews, most single group pre-test and post-test evaluations found significant benefits of using virtual patient tools and it is possible there was publication bias with negative findings being unpublished [13,14]. The review was also limited by the small percentage of abstracts that were double screened for inclusion. However, the agreement between screeners was good and any discrepancies were discussed; abstracts where there was uncertainty of inclusion were included in the full text review to ensure we captured as many relevant articles as possible [56].

Conclusion
Overall, the evidence suggests virtual patient tools could effectively complement current teaching and may be particularly useful if opportunities for face-to-face learning are limited. This research found that evaluations that measured clinical reasoning by measuring case specific domains of clinical reasoning, such as ideas about diagnoses or data gathering, showed more consistent improvement in reasoning than more general measures of reasoning, such as problem-solving. Case specific measures of clinical reasoning may be more sensitive to change following virtual patient cases because they reflect the context dependent nature of clinical reasoning skills. Future evaluations should provide evidence of the validity and reliability of their clinical reasoning outcome measures to aid the comparison of effectiveness between studies. More understanding is needed about how features of virtual patient design and delivery relate to effectiveness.