Abstract
Objective
Patients and clinicians rarely experience healthcare decisions as snapshots in time, but clinical decision support (CDS) systems often represent decisions as snapshots. This scoping review systematically maps challenges and facilitators to longitudinal CDS that are applied at two or more timepoints for the same decision made by the same patient or clinician.
Methods
We searched Embase, PubMed, and Medline databases for articles describing development, validation, or implementation of patient- or clinician-facing longitudinal CDS. Validated quality assessment tools were used for article selection. Challenges and facilitators to longitudinal CDS are reported according to PRISMA-ScR guidelines.
Results
Eight articles met inclusion criteria; each article described a unique CDS. None used entirely automated data entry, none used living guidelines for updating the evidence base or knowledge engine as new evidence emerged during the longitudinal study, and one included formal readiness for change assessments. Seven of eight CDS were implemented and evaluated prospectively. Challenges were primarily related to suboptimal study design (with unique challenges for each study) or user interface. Facilitators included use of randomized trial designs for prospective enrollment, increased CDS uptake during longitudinal exposure, and machine-learning applications that are tailored to the CDS use case.
Conclusions
Despite the intuitive advantages of representing healthcare decisions longitudinally, peer-reviewed literature on longitudinal CDS is sparse. Existing reports suggest opportunities to incorporate longitudinal CDS frameworks, automated data entry, living guidelines, and user readiness assessments. Generating best practice guidelines for longitudinal CDS would require a greater depth and breadth of published work and expert opinion.
Introduction
Clinical decision support (CDS) efficacy continues to increase, bolstered by the widespread adoption of electronic health records and incremental adoption of interoperability frameworks.1–3 Integration of CDS within existing digital workflows has been associated with increased patient safety,4,5 cost containment,6,7 and greater patient engagement in their own care.8,9 Efforts to further optimize the development, validation, dissemination, and implementation of CDS have the potential to substantially improve healthcare quality.
The five “rights” of CDS includes the right information delivered to the right person in the right format through the right channel at the right
We performed a scoping review of articles describing longitudinal CDS to systematically map what is known and unknown on the topic, including challenges and facilitators to longitudinal CDS. We use results from this review to suggest future directions for the scientific investigation and implementation of longitudinal CDS, with a focus on operationalizing longitudinal CDS that are seamlessly integrated with existing digital workflows.
Methods
We searched Embase, PubMed, and Medline databases for articles describing longitudinal CDS published between database inception and February 25th, 2023. Article search terms, exclusion at screening, and full text review phases are illustrated in Figure 1. Obtaining informed consent was not applicable for this review article. Article search terms were as follows: (“develop*”:ab,ti OR “validat*”:ab,ti OR “implement*”:ab,ti) AND (“decision support tool”:ab,ti OR “decision support system”:ab,ti OR “decision aid”:ab,ti) AND (“patient”:ab,ti OR “provider”:ab,ti OR “clinician”:ab,ti OR “physician”:ab,ti OR “doctor”:ab,ti) AND (“over time”:ab,ti OR “longitudinal”:ab,ti) AND [article]/lim AND [humans]/lim AND [english]/lim AND ([embase]/lim OR [medline]/lim OR [pubmed-not-medline]/lim). Articles were included if they (1) described development, validation, or implementation of patient- or clinician-facing CDS, (2) described CDS application (a tool, system, or aid) at two or more timepoints that both occurred after using the CDS for the same discrete decision by the same patient or clinician (i.e. not an aggregate analysis of all pre-CDS vs. all post-CDS decisions), and (3) were published in English as a peer-reviewed journal article. We excluded all articles not meeting these criteria, as well as study protocols or CDS architecture descriptions that did not report experiments or results. The search criteria identified 61 articles. After removal of two duplicates, 59 articles remained.

Article search parameters.
Abstracts were screened by two reviewers. Screening disagreements were resolved by a third reviewer. The two screening reviewers had 69.4% agreement and a Cohen's Kappa statistic for inter-rater reliability of 0.29. Forty-five articles were excluded during the screening process because they did not meet inclusion criteria. For the remaining 14 articles, quality was rated using validated quality assessment tools (e.g. the Quality Assessment of Controlled Intervention Studies and the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies each rank 14 binary criteria). 14 Articles rated “poor” and those for which the full text did not meet inclusion criteria were excluded. Six articles were removed during full text review. Eight articles remained and were included in the final analysis. Results are reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) guidelines, as listed in Supplemental Table 1. Sources of funding and competing interests for each article are listed in Supplemental Table 2.
For each included article, we extracted data regarding: the study population; CDS architecture (including whether it was patient-facing, clinician-facing, or both) and performance; whether the CDS was automated (i.e. it did not require manual data entry by users); whether the CDS formally assessed user readiness for change, whether a longitudinal CDS conceptual framework (e.g. Systems Engineering Initiative for Patient Safety (SEIPS) 13 ) was applied; whether the CDS was evaluated prospectively; whether the CDS used living guidelines (i.e. the CDS knowledge engine uses guidelines that are informed by a dynamic knowledge base that is automatically updated whenever new evidence becomes available, in contrast to traditional CDS knowledge engines that require manual software updates that are performed when and if developers deem them necessary); and descriptions of challenges or facilitators to development, validation, or implementation of longitudinal CDS.
Results
No articles used a longitudinal CDS framework, automated data entry, or living guidelines
The eight included articles each described one unique CDS, which are summarized in Table 1. The number of participants ranged substantially across studies, from 15 to 1001 participants. One longitudinal CDS was clinician-facing only, 5 were patient-facing only, and 2 were both clinician- and patient-facing. Study outcomes varied, ranging from measurement of self-management behaviors (
Summary of included studies.
CD-ROM: compact disc read-only memory, PCP: primary care provider, and QI: quality improvement.
All CDS had several elements in common: none used a longitudinal CDS framework, none used entirely automated data entry, and none used living guidelines for updating the evidence base or knowledge engine as new evidence emerged during the longitudinal study. One commonality was positive: seven of the eight studies15–21 performed prospective implementation and data capture.
Readiness for change assessments were sparse
Of the eight CDS, one—reported by Horwood et al. 20 —included formal readiness for change assessments. Nurses in rural Africa who would be entering information about children's conditions in a computer based-CDS were assessed for their capabilities, opportunities, and motivation according to a behavior change framework developed by Michie et al. 22 In a rural African setting where computer-based care was not routine, this assessment demonstrated that 40% of the nurses were “not very confident” (indicating the least possible confidence) about using a computer, and 60% had not used a computer within the last month. Qualitative analyses of in-depth interviews revealed that the CDS was poorly aligned with other priority clinic programs, which may have affected nurses’ motivation to use the CDS. Throughout the study period, CDS uptake—calculated as the proportion of all consultations with children aged less than 5 years in which the CDS was used—was never greater than 40% in 12 of 15 clinics, never reaching 70% in any clinic. Among four of the other seven CDS,16,18,19,23 there was no evidence of a statistically significant change in behavior, decisions, or perceptions, and it remains unknown whether results would have been positively affected by selection of participants who were ready for change, or by implementation of methods intended to increase readiness.
Challenges to longitudinal CDS
Four CDS encountered study design challenges. Kunzler et al. 19 performed an exploratory longitudinal CDS study, presumably because longitudinal data on the topic were unavailable when their study began. In the absence of a power analysis or sample size determination, it was difficult to ascertain the false negative rate, i.e. finding no observed association between the CDS and decreased caregiver strain, burden, or anxiety when one actually existed. For the CDS proposed by Chiang et al., 18 focused on predicting outpatient seizures among patients with epilepsy, the authors used clinician assessments alone (i.e. unaided by CDS) as a comparison for the CDS. Inter-rater reliability of clinicians was low–moderate, which compromised the statistical validity of the comparison. Wang et al. 21 delivered the CDS intervention, focused on anticoagulation decisions for patients with atrial fibrillation and at risk for stroke, only once and then assessed outcomes (primarily, decisional conflict) over time, so it could not be assessed whether repeated exposure to the intervention would prolong its effects. Finally, Leighl et al., 16 whose CDS focused on chemotherapy decisions by patients with metastatic colorectal cancer, found that most patients already felt confident in their decision at the beginning of the study, hampering assessment the longitudinal effects of the CDS. Two CDS faced user interface challenges. Begley et al. 17 noted that their patient interface which showed longitudinal comparisons with prior timepoints was difficult for users to interpret. The clinician-facing CDS proposed by Horwood et al., 20 whose CDS focused on medication management by patients with epilepsy, was hindered by a lack of user computer skills. Technical support was made available by the investigator team, but technical support was accessible only by computer. Finally, Hooker et al. 15 provided their CDS to patients by mailing them a CD-ROM, which meant that they could not track its use.
Facilitators to longitudinal CDS
Four CDS15,16,19,21 optimized enrollment and follow-up via randomized trial or post-hoc analysis of randomized trial designs. Two CDS may have benefitted from the longitudinal design itself. Zhang et al. 23 used feedback from clinicians to redesign and optimize the CDS user interface over time by moving frequently used fields to accessible, highly visible areas. Horwood et al. 20 noted that clinical uptake increased over time as users gained additional exposure to the CDS. One CDS demonstrated the potential advantages of machine learning approaches that are tailored to the CDS use case. Chiang et al., 18 in developing a CDS built on seizure prediction, recognized that longitudinal assessment of seizure based on raw seizure frequency is confounded by natural variability in the disease process. Therefore, they used a Bayesian algorithm and captured temporal dependencies using a Markov process to allow formal assessment of seizure control rather than raw frequency, with good results: the algorithm had significantly greater accuracy than clinicians in predicting seizure. Although no CDS used living guidelines to incorporate emerging evidence, doing so would represent another advantage of the longitudinal design model.
Discussion
This review highlights the lack of peer-reviewed reports of longitudinal CDS, and that CDS in existing reports lack longitudinal CDS frameworks, automated data entry, living guidelines, and readiness assessments. These findings suggest major opportunities to improve the volume and quality of longitudinal CDS in efficiently and effectively representing decision evolution while simultaneously demonstrating the how information and users’ readiness for change evolves over time. To this end, several common themes emerged regarding challenges and facilitators to longitudinal CDS.
Concerns regarding study design were apparent in half of the included articles, consistent with the pioneering nature of longitudinal CDS scientific investigation; as peer-reviewed literature accumulates, investigators designing studies will access a greater repository of salient knowledge. Similarly, challenges in designing optimal user interfaces and CDS delivery mode may be attributable to a lack of guidance on best practices. These would require a greater depth and breadth of published work alongside expert opinion on longitudinal CDS. The most common facilitator to longitudinal CDS was performing a randomized trial for optimizing enrollment and follow-up. Unfortunately, performing randomized trials is resource intensive; other, more accessible facilitators are needed. One investigator group 18 demonstrated the potential utility of integrating machine-learning algorithms into CDS to escape the constraints of linear and rule-based knowledge engines when representing complex, nonlinear processes like longitudinal seizure activity.
We are unaware of any prior reviews regarding longitudinal CDS. Although CDS gained prominence in the 1980s and have evolved substantially, longitudinal CDS are relatively novel. 1 We hope that this review will highlight the sparsity of peer-reviewed literature regarding longitudinal CDS and encourage the scientific community to increase the volume and quality of longitudinal CDS development, implementation, and investigation.
Although published literature contains too few examples for making evidence-based recommendations of best practices in longitudinal CDS, several opportunities emerge from this review. First, for purposes of standardization and reproducibility, it seems prudent to use a longitudinal CDS framework like SEIPS. 13 Second, to improve efficiency and decrease user activation energy, longitudinal CDS should use automated data entry techniques. All CDS may benefit from automation, but it may be especially important for longitudinal CDS that depend on the same users opting to maintain engagement with the CDS over time. There may be opportunities to integrate automation steps with artificial intelligence algorithms that enable and augment the CDS, as previously described for nonlongitudinal CDS.24–26 Third, to maintain up-to-date evidence and knowledge, longitudinal CDS should abandon static rules and knowledge engines and instead use living guidelines that are updated in real time as evidence emerges. Fourth, readiness assessments should be performed to ensure that the right person is receiving the intervention at the right time and to aid in interpretation of negative results by determining whether a lack of change in behavior, decisions, or perceptions was inevitable, rather than a failure of the CDS itself.
Limitations
This scoping review was limited by the small number of included studies, although highlighting the small number of relevant studies is an important outcome. Although the small number of included studies could indicate that more time must pass before it would be ideal to review longitudinal CDS, we see value in an early description of published work that identifies barriers and facilitators that may aid future endeavors. Also, because it is difficult to replicate the article search parameters when surveying nonclinical bibliographic databases, and because our focus was on clinical aspects of CDS, this review does not include articles from more technical, nonclinical peer-reviewed journals.
Conclusions
There are few peer-reviewed reports of longitudinal CDS. Existing reports suggest opportunities for improvement by incorporating longitudinal CDS frameworks, automated data entry, living guidelines, and user readiness assessments. These opportunities are observed in the absence of guidance on best practices for longitudinal CDS; generating best practice guidelines would require a greater depth and breadth of published work and expert opinion. We hope that this review will encourage the scientific community to embark on a course of increasing the volume and quality of longitudinal CDS that accurately represent the evolving nature of many healthcare decisions.
Supplemental Material
sj-docx-1-dhj-10.1177_20552076241249925 - Supplemental material for Longitudinal clinical decision support for assessing decisions over time: State-of-the-art and future directions
Supplemental material, sj-docx-1-dhj-10.1177_20552076241249925 for Longitudinal clinical decision support for assessing decisions over time: State-of-the-art and future directions by Tyler J Loftus, Jeremy A Balch, Jenna L Marquard, Jessica M Ray, Brian S Alper, Neeraj Ojha, Azra Bihorac, Genevieve Melton-Meaux, Gopal Khanna and Christopher J Tignanelli in DIGITAL HEALTH
Supplemental Material
sj-docx-2-dhj-10.1177_20552076241249925 - Supplemental material for Longitudinal clinical decision support for assessing decisions over time: State-of-the-art and future directions
Supplemental material, sj-docx-2-dhj-10.1177_20552076241249925 for Longitudinal clinical decision support for assessing decisions over time: State-of-the-art and future directions by Tyler J Loftus, Jeremy A Balch, Jenna L Marquard, Jessica M Ray, Brian S Alper, Neeraj Ojha, Azra Bihorac, Genevieve Melton-Meaux, Gopal Khanna and Christopher J Tignanelli in DIGITAL HEALTH
Footnotes
Acknowledgments
The authors thank members of the University of Florida Intelligent Critical Care Center, for providing administrative support for this work.
Contributorship
TJL contributed to conceptual design, article screening, full text review, and manuscript drafting. JAB and CJT contributed to article screening, full text review, and made critical revisions to the manuscript. JLM, JMR, BSA, NO, AB, GMM, and GK interpreted results and made critical revisions to the manuscript. CJT provided supervision, interpreted results, and made critical revisions to the manuscript.
Declaration of conflicting interest
The author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article. BA owns Computable Publishing LLC and NO owns EunoChains LLC. The other authors declare that there is no conflict of interest.
Ethical approval
Institutional Review Board approval was not applicable to this review.
Funding
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: TJL was supported by the National Institute of General Medical Sciences (NIGMS) of the National Institutes of Health under Award Numbers K23 GM140268 and R01 GM14965701 and by the Thomas H. Maren Junior Investigator Fund. CJT is supported by Agency for Healthcare Research and Quality (AHRQ) grant R18HS028583.
Guarantor
The corresponding author, CJT, is the guarantor for this article.
Supplemental material
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References
Supplementary Material
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