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Journal of General Internal Medicine

, Volume 32, Issue 2, pp 182–188 | Cite as

A Pilot Study of the Chronology of Present Illness: Restructuring the HPI to Improve Physician Cognition and Communication

  • Laura M. Mazer
  • Tina Storage
  • Sylvia Bereknyei
  • Jeffrey Chi
  • Kelley Skeff
Original Research

Abstract

Background

Patient history-taking is an essential clinical skill, with effects on diagnostic reasoning, patient–physician relationships, and more. We evaluated the impact of using a structured, timeline-based format, the Chronology of Present Illness (CPI), to guide the initial patient interaction.

Objective

To determine the feasibility and impact of the CPI on the patient interview, written notes, and communication with other providers.

Design

Internal medicine residents used the CPI during a 2-week night-float rotation. For the first week, residents interviewed, documented, and presented patient histories according to their normal practices. They then attended a brief educational session describing the CPI, and were asked to use this method for new patient interviews, notes, and handoffs during the second week. Night and day teams evaluated the method using retrospective pre–post comparisons.

Participants

Twenty-two internal medicine residents in their second or third postgraduate year.

Intervention

An educational dinner describing the format and potential benefits of using the CPI.

Main Measures

Retrospective pre–post surveys on the efficiency, quality, and clarity of the patient interaction, written note, and verbal handoff, as well as open-ended comments. Respondents included night-float residents, day team residents, and attending physicians.

Key Results

All night-float residents responded, reporting significant improvements in written note, verbal sign-out, assessment and plan, patient interaction, and overall efficiency (p < 0.05). Day team residents (n = 76) also reported increased clarity in verbal sign-out and written note, improved efficiency, and improved preparedness for presenting the patient (p < 0.05). Attending physician ratings did not differ between groups.

Conclusions

Resident ratings indicate that the CPI can improve key aspects of patient care, including the patient interview, note, and physician–physician communication. These results suggest that the method should be taught and implemented more frequently.

KEY WORDS

communication clinical reasoning electronic health records 

INTRODUCTION

One of the first clinical skills taught in medical school is patient history-taking, a skill that directly impacts diagnosis, treatment, patient satisfaction, adherence, and overall health outcomes.1 3 The patient interview is perhaps the most common and essential clinical task a physician performs, and an effective interview must balance a variety of different purposes. Physicians work to establish rapport and build a relationship,4 while also obtaining essential medical information,5 assessing and understanding the patient,6 detecting psychosocial problems,7 and facilitating patient adherence.8

To accomplish all of these goals in a patient-centered fashion, students and house staff are frequently taught to take and write the patient history in the form of a prose narrative. Although the paragraphs of a prose narrative have merit, they can result in unstructured notes that lack clarity and comprehensiveness. A complete patient history can lead to a correct diagnosis in up to 75–80 % of patients,9 , 10 emphasizing the need to identify tools that can improve our practice of this key clinical skill. This is especially important in light of the 2015 Institute of Medicine (IOM) report warning that diagnostic errors are an increasingly recognized source of morbidity, mortality, and healthcare costs.11 Threats to the quality and quantity of data obtained from a patient history impact diagnostic ability.

The current care environment, with high patient volumes, increased handoffs, and an expectation of rapid throughput12 , 13 can exacerbate the challenge of obtaining and recording an accurate history. The physician who obtains the history may not be involved in the patient’s ongoing care, and handoffs to new providers require a rapid verbal synthesis of information with an interpreted diagnostic plan. This synthesis may result in dilution or compression of the raw data obtained from the patient. Consultants who are later engaged face the same challenge, receiving a synthesized version of the history that is often presented around an already established diagnosis.

Greater time constraints, increased patient load, increased handoffs, and a need to build relationships without sacrificing data gathering are key challenges for physicians when taking and recording a patient history. The Chronology of Present Illness (CPI), previously described by one of the authors of this study (KS), provides an alternative to the traditional history of present illness (HPI) that may overcome some of these challenges.14 , 15 The HPI is recorded as a prose narrative, often described as a story culminating in a diagnosis. To make the information "fit" into a coherent story, students—and even experienced physicians—may ignore potentially crucial facts.16 The CPI, in contrast, documents the chronological evolution of the patient’s symptoms without omissions. Dates or times are placed on the left side of the page, and the descriptions of symptoms, patient activities, treatments, or other events are listed on the right side (Fig. 2). The CPI emphasizes the timeline as an overarching conceptual framework to facilitate history-taking, note-writing, case analysis, and physician–physician communication.14 By structuring the patient’s symptoms according to their timeline, physicians can more easily concentrate on symptom evolution, avoiding the increased cognitive load necessary to extract the evolution of symptoms from a prose story.

In the current study, we introduced internal medical residents on a night-float rotation to the CPI format. We asked them to use the CPI to interview patients, write notes, and communicate to the oncoming day team. We hypothesized that the CPI would improve the clarity, efficiency, and usefulness of the patient interview and written note, resulting in improved patient–physician communication, physician–physician communication, clinical reasoning, and differential diagnosis.

METHODS

Participants

Postgraduate year (PGY) 2 and 3 internal medicine residents at Stanford University rotating on a 2-week night-float service were invited to participate. During this rotation, residents see new consults or admissions for internal medicine, cardiology, hematology, and oncology. The residents write a history and physical note, structuring the history portion in accordance with their own and their team’s preferences. Night residents then verbally “hand off” the new patients to the day team residents each morning, and the day teams present the patients to the attending physician on rounds.

The Stanford Institutional Review Board (IRB) determined that this study did not meet federal regulations’ definition of human subjects research and was exempt from IRB review.

Intervention

From November 14, 2015, through February 19, 2016, PGY-2 and PGY-3 residents on a night-float rotation were contacted by email at the halfway point in their rotation with an invitation to participate. Prior to this email, residents admitted patients without intervention, taking the history and writing the note according to their usual practice. At a mid-rotation educational dinner, residents were introduced to the CPI and given copies of a published article describing this method (Fig. 1).14 They were also shown comparison examples of real HPI notes rewritten in CPI format (Fig. 2). Residents were asked to use the CPI to take, write, and communicate all new patient histories for the remaining week of the night-float rotation.
Figure 1

Study design.

Figure 2

Comparison of HPI note rewritten in CPI format. Reproduced from Skeff 2014 J Gen Intern Med 29(1):13-15, with permission from Springer.

Data Collection

All night-float residents were given a retrospective pre–post questionnaire17 , 18 at the end of the 2-week rotation. Using a five-point Likert scale, residents rated the clarity and quality of their written note and verbal sign-out, the quality of patient interactions, and their overall efficiency before and after using the CPI. The day team residents completed a similar questionnaire (Appendix A). Attending physicians rotated for 1-week periods, and therefore were not able to provide retrospective pre–post data. This group was given only a post-CPI survey. They were unaware whether they were evaluating a control (pre-CPI) or an intervention (post-CPI) week. Some of the attending physicians were rotating for multiple individual weeks during the study period, and were asked to complete more that one survey. All participants were also asked for open-ended comments regarding benefits and challenges associated with the CPI. Power calculations were performed to estimate a required sample size based on prior data indicating that the difference in response of matched pairs with a continuous-variable Likert scale is normally distributed with standard deviation of 1.3. Detection of a true difference of one point with a power of 0.8 and a type I error of 0.05 would require 15 subjects, with each subject serving as their own matched pair. The surveys are reproduced in Appendix A.

Analysis

Average Likert ratings for the week before and after the introduction of CPI were compared using a two-tailed t test (alpha = 0.05). Analyses were performed using SAS version 9.3 statistical software (SAS Institute Inc., Cary, NC, USA). Qualitative open-ended survey questions were categorized using content analysis techniques.19 Two researchers (LMM, SBM) read a subset of the comments and developed an initial coding framework in an inductive, iterative fashion, resulting in a category scheme classifying comments as positive or negative, and categorizing them in accordance with the phase of work they described (chart review, patient interview, differential diagnosis, or sign-out). This consensus coding framework was then applied to the entire dataset; after discussion of each disagreement, reviewers reached 100 % consensus. A member check was completed by conducting semi-structured interviews with a subsection of surveyed residents, who reviewed the classifications and agreed with the framework.

RESULTS

Participants

Twenty-two eligible residents were assigned to a night-float rotation during the study period. During the final rotation of the study period, two residents who had previously been through the intervention had a second night-float block. These residents were not considered eligible and were not invited to participate during the second rotation. All 22 eligible residents (17 PGY-2, 5 PGY-3) agreed to participate. Twenty participants attended the in-person educational dinner; two were unable to attend due to family conflicts and received the information via a telephone call with one of the co-investigators (LMM or TRS) and were sent the article electronically. Thirteen residents (59 %) had previously heard of the CPI.

Survey Data

All night-float participants completed the end-of-rotation survey (100 % response rate, n = 22). On average, residents estimated that they used the CPI in 76 % of patient interviews during the intervention week (range 50–100, SD 19.4). Residents reported significant improvements in the quality of patient interactions (3.59 vs. 4.14, p = 0.001), the clarity of the written note (3.32 vs. 4.41, p < 0.001), the quality of the assessment and plan (3.72 vs. 4.05, p = 0.03), and the clarity of their verbal morning sign-out (3.45 vs. 4.32, p < 0.001; Table 1).
Table 1

Opinions of Night-Float Residents, Day Team Residents, and Attending Physicians on the Week Before and After the Introduction of the CPI Method

 

Before CPI*

After CPI*

p value†

Night-float residents (n = 22)

 Clarity of verbal sign-out

3.45

4.32

<0.001

 Clarity of written note

3.32

4.41

<0.001

 Quality of assessment and plan

3.72

4.05

0.030

 Quality of patient interactions

3.59

4.14

0.001

 Efficiency in completing the history and physical

3.32

4.14

<0.001

Day team residents (n = 76)

 Clarity of verbal sign-out

3.95

4.33

0.003

 Clarity of written note

3.93

4.33

0.006

 Quality of assessment and plan

4.11

4.33

NS

 Efficiency of sign-out

3.84

4.24

0.008

 Preparedness to present

3.81

4.20

0.003

Attending physicians (n = 14)

 Clarity of day team presentation

4.06

4.07

NS

 Clarity of written note

4.17

4.36

NS

 Quality of written assessment and plan

4.17

4.21

NS

 Quality of verbal assessment and plan

4.00

4.14

NS

 Efficiency of morning rounds

4.05

3.92

NS

*Mean

†Two-tailed t test

Day team residents also rated these elements on the same five-point scale (Table 1). In total, 134 residents received sign-outs from the night-float residents during the study period, among which 76 (57 %) completed the online survey. Day team ratings indicated significant improvement in the clarity of the verbal sign-out (3.95 vs. 4.33, p = 0.003) and written note (3.93 vs. 4.33, p = 0.006). Day team residents also felt more prepared to present the patients themselves (3.81 vs. 4.20, p = 0.003). Of 62 attending weeks during the study period, 32 (52 %) attendings completed post-week surveys. The attending ratings did not indicate a significant difference, although both pre- and post-CPI ratings were generally 4.0 or above (Table 1).

Open-Ended Comments

All night-float residents were additionally asked for open-ended comments regarding benefits and challenges with the CPI method. Their responses related the CPI to several phases of patient care, including chart review before seeing the patient, the patient interview, developing a differential diagnosis, morning sign-out, and later interactions with consulting services (Table 2). Twenty-one participants commented on 49 perceived benefits of using the CPI, and 13 participants commented on 15 challenges. Overall, the most common challenge was the longer time commitment at each stage, including “upfront longer time commitment” and “longer conversations with patients.”
Table 2

Representative Resident Comments on Using the CPI

 

Benefits

Challenges

Challenges that lead to benefits

Pre-work

“I found that if I drafted the CPI with the information available in the chart before I met the patient, it helped me target my interview.”

(n = 7)*

“Up front larger time commitment in filling in information in the chronology.”

(n = 2)

“Forces you to seek objective data instead of perpetuating chart lore.”

(n = 1)

Patient interaction

“Patients were very appreciative that I knew much of their history.”

“I had one patient who was very tangential and disorganized… helped to organize their story to what they were trying to express.”

(n = 8)

“Longer conversation with patients.”

“Sometimes difficult to know when to start the chronology (i.e. patients with complicated histories but here with a simple complaint).”

(n = 8)

“Patients don’t always know what happened. Or get it wrong. This is also a problem for the traditional HPI, but at least you can hide the fact that you didn’t get a real history when you write a traditional HPI.”

(n = 1)

Differential diagnosis

“Using the CPI as it turns out the diarrhea started after antibiotics were started for the face rash and the diarrhea was from antibiotics.”

“Greater clarity, better diagnostic framework.”

(n = 6)

“Much more time consuming without significant changes in assessment and plan.”

(n = 1)

“Given it prompts you to be complete, it sometimes can make the history taking and documentation cumbersome (though, it may be worth it at the end, because you feel like you know the pt better).”

(n = 2)

Verbal and written sign-out

“Morning sign-out is noticeably more efficient with the CPI.”

“You know exactly how you’ll be organizing the history before you start writing it.”

“It improved the clarity and precision of written notes and verbal sign-outs for patients that had multiple hospitalizations.”

(n = 24)

“Sometimes pertinent review of systems info is tricky to format.”

“Sometimes difficult to use for patient transfers, given need to rewrite a major portion of the history…when original authors have already written a prose-form HPI.”

(n = 4)

“At times, it lent itself to lengthier notes (though overall, probably included helpful pertinent information).”

(n = 3)

Impact beyond the initial note or sign-out

“Found that it was extremely helpful in communicating with consults. Found less time required in conveying HPI during urgent consults.”

“Interns love to read the notes.”

(n = 4)

(none reported, n = 0)

“For patients with a lot of old records in the chart, writing a complete CPI is probably less efficient (though probably more helpful to providers reading the note).”

(n = 1)

*Refers to the number of comments in this category

Six residents also discussed specific challenges in using the CPI that eventually led to improved patient care. These challenges that led to benefits focused mostly on an increase in initial work, but with eventual payoff in clarity or efficiency. One participant wrote:

“Takes some more time initially to prepare and to decode the patient’s story into a timeline but [the CPI] saves much more time later when discussing the case.”

The attending physicians were also invited to share any additional, open-ended comments. The attending comments fell into two categories. The first consisted of generally positive comments towards the CPI, for example, “I really like CPI, makes the history much easier to follow.” The second category included comments on the attending physician’s inability to fully evaluate resident sign-out:

“Unable to evaluate verbal component as it occurs between medical teams at 7am.”

“Many attendings do not have interns do formal presentation of overnight patients.”

There were no negative comments from any attending regarding the CPI.

The majority of day team resident comments (9 of 17) were general positive comments on the new method, including “I love the use of the timeline!” and “Presentations and patient histories are much more concise when abandoning the traditional narrative.” Of the remaining comments, three were unrelated to the format (e.g., “I prefer bedside signout for ICU patients”). The remaining five indicated that the day team did not notice a difference: “Didn’t really notice a difference.”

DISCUSSION

This study is the first formal evaluation of the Chronology of Present Illness. As hypothesized, admitting residents reported significant improvements in all queried measures of their overnight workflow with the CPI method. Residents reported increased patient satisfaction, describing in their comments that patients felt that a CPI-oriented interview made it easier for them to tell their story, highlighting the potential to improve patient–physician communication. The day team residents also reported significant improvements in all metrics, including improved preparedness to present new patients, highlighting the method’s ability to improve the quality and safety of patient handoffs. Attending physician surveys did not reflect a difference between the two methods, although open-ended comments reflected approval. Several attendings commented that they did not routinely supervise the sign-out process or read overnight notes, potentially indicating that the lack of significant results reflected the medical team workflow more than the impact of the CPI.

In the open-ended comments, residents reported over three times as many benefits as challenges with using the CPI. Additionally, comments indicated that although the method presented some initial challenges, it ultimately resulted in better patient care. Residents described changes to every stage of their workflow, from researching the patient’s history in the medical record, through post-admission consults. There are multiple published tools and frameworks for each aspect of the initial patient interaction, from the pre-interview chart biopsy,20 , 21 to the interview itself,4 , 6 , 7 , 22 , 23 to the verbal handoff24 27 and consult request.28 31 The open-ended comments in this study demonstrate that residents found the CPI to be a useful framework for each stage of the process, indicating that this structure can facilitate patient care through the entire patient interaction with the healthcare system.

By providing a uniform framework for obtaining and recording patient information, the CPI may reduce the cognitive load on both patients and physicians. Cognitive load theory suggests that all elements of a task, from its intrinsic complexity to the environment in which it occurs, increase the required mental effort and stress.25 Cognitive aids, on the other hand, are external resources that can simplify the work process and help users complete a task by reducing extraneous cognitive load.32 34 The CPI as a cognitive aid has the potential to benefit both patients and physicians. When the CPI is used, patients are encouraged to report every symptom or event, freeing them from the need to distinguish relevant from irrelevant information and providing a structure for their narrative. Several of the resident comments indicated that patients seemed to find it easier to tell their story when provided with this structure, a finding that warrants further investigation of patients’ perspectives. The timeline also allows physicians to concentrate on symptom evolution instead of struggling with how to organize the data, or deciding which details to include in the initial history. In fact, this method may highlight previously unrecognized historical data that can facilitate physician learning and improved diagnosis.

This study takes on great importance now when the field of medicine is increasingly concerned with diagnostic errors.11 , 35 The CPI addresses several issues that can lead to diagnostic errors highlighted by the recent IOM report, including insufficient data collection and premature information integration and interpretation by care providers. The method can also improve patients’ ability to describe their story by providing a structure that physicians and patients can equally understand: a timeline. By standardizing the structure of the patient’s history, the CPI may enable the entire team to better understand the patient’s story, a key first step in the diagnostic process.

This issue is even more relevant with the advent of the electronic medical record and the resulting “cut-and-paste” approach to notes.36 The consequences of cutting and pasting a prose note include perpetuation of chart lore, where previously misreported or inadequately recorded information is carried forward, a ballooning patient history that is the compilation of all prior notes, and eventually, the possibility that the patient history is no longer read, because it is too long or is untrustworthy.36 , 37 In contrast, with a timeline, new providers can rapidly confirm the history’s accuracy with the patient and expand the timeline with ease. The CPI can provide a continuous structure for patient information, allowing for later appreciation of symptoms whose importance may have been initially overlooked.

There are several limitations to the current study. First, this is a single-institution, single-department investigation. Our study population may not be generalizable, in part because the CPI had been taught informally to individual residents by one of the authors (KS). While no formal educational intervention has previously been undertaken, over half of the night-float residents had heard of the CPI. It is possible that a learning curve is required, and our positive results are due in part to pre-existing experience. Longer periods may be required for completely novice groups to see the same benefits. It is also possible that the improvement from the first to the second week of night-float represents natural improvements in efficiency with time and experience. To mitigate this possibility, we included only PGY-2 and PGY-3 residents, not interns whose learning curve is likely steeper. The participants in this study had all been through prior night-float rotations, and it is unlikely that a significant change in residents' workflow would occur independently over the study period.

This is a survey study, and has associated limitations. While we had 100 % response from the night-float residents, we had lower response rates from day teams and attending physicians. This may reflect the workflow, as we did have some residents and attendings state that they did not admit any new patients during the study period and therefore did not feel qualified to answer. It is unclear what proportion of the non-respondents fall into this category. Additionally, the use of a retrospective pre-CPI rating may yield a socially desirable positive effect. While the majority of attending comments referred to the workflow, e.g., noting that they do not routinely observe sign-out, it is possible that the lack of change in attending surveys implies that the change seen in resident surveys is actually the result of social desirability bias. However, the qualitative comments lend credibility to the quantitative results, in both the resident and attending surveys. Finally, the results of this study represent the perceptions of the involved physicians. While potentially a limitation, physician perception is an important measure of the type of variables examined in this study. The self-reported improvements in efficiency and clarity are crucial first pieces of evidence for the theory that utilizing the CPI may reduce the cognitive load for the initial patient interaction.

Conclusion and Next Steps

The current approach to a narrative HPI asks providers to both record and interpret information as they take, write, and report patient history. In contrast, the CPI provides a structure for obtaining and documenting accurate patient information. Future studies should investigate the direct impact of the CPI on patient satisfaction and diagnostic reasoning skills. This first study provides compelling initial evidence that the CPI can improve the efficiency, clarity, and usefulness of the patient history, with potential benefits for provider communication, diagnostic reasoning, and patient satisfaction.

Notes

Acknowledgments

The authors would like to acknowledge the internal medicine residents at Stanford University School of Medicine. We would especially like to acknowledge the chief residents, Drs. Alexander Perino, Kate Weaver, and Evan Hall. We would also like to thank the internal medicine program director, Dr. Ronald Witteles, for his support and assistance with data collection.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they do not have a conflict of interest.

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Copyright information

© Society of General Internal Medicine 2016

Authors and Affiliations

  • Laura M. Mazer
    • 1
  • Tina Storage
    • 2
  • Sylvia Bereknyei
    • 1
    • 2
    • 3
  • Jeffrey Chi
    • 2
  • Kelley Skeff
    • 2
  1. 1.Goodman Surgical Education Center, Department of SurgeryStanford University School of MedicineStanfordUSA
  2. 2.Department of MedicineStanford University School of MedicineStanfordUSA
  3. 3.Research and Evaluation, Office of Medical EducationStanford University School of MedicinePalo AltoUSA

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