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CT ordering patterns for abdominal pain by physician in triage
YAJEM-56469; No of Pages 4 American Journal of Emergency Medicine xxx (2017) xxx–xxx
Contents lists available at ScienceDirect
American Journal of Emergency Medicine journal homepage: www.elsevier.com/locate/ajem
CT ordering patterns for abdominal pain by physician in triage Kaitlyn Matz a,⁎, Todd Britt b, Virginia LaBond c a b c
Emergency Medicine, Genesys Regional Medical Center, One Genesys Parkway, Grand Blanc, MI 48439, USA Emergency Medicine, Genesys Regional Medical Center, Grand Blanc, MI, USA Emergency Medicine, Genesys Regional Medical Center, Grand Blanc, MI, USA
a r t i c l e
i n f o
Article history: Received 6 October 2016 Received in revised form 31 January 2017 Accepted 3 February 2017 Available online xxxx Keywords: Physician in triage Throughput Ordering patterns
a b s t r a c t Background: Overcrowding in the Emergency Department is a problem with many strategies for intervention such as the physician in triage (PIT). This brief evaluation is designed to minimize diagnostic uncertainty and expedite the work up when the patient is seen in the Emergency Department. We hypothesized that this would increase CT imaging which would be increasingly negative as the pressure to maintain throughput rises on busy days in the Emergency Department. Methods: We designed a retrospective study in which ordering patterns of Emergency physicians was explored using a group of patients with abdominal pain, presenting to triage in a 2 year period. We compared CT ordering rates on the 5% highest and lowest volume days (HD5 and LD5) and examined the bivariate relationship between volume and imaging utilization. Results: There was no statistical significance in the rate of CT's ordered collectively by PIT physicians on HD5 compared with LD5 with a p-value of 0.25. There is a trend toward increased utilization when each physician is compared to themselves on HD5 vs. LD5 but these were not statistically significant differences. The percentage of “clinically relevant” CTs was not determined to be different, but there was an increase in the LOS when a CT was ordered on both LD5 and HD5 (HD5 p-value 0.0004; LD5 p-value 0.009). Conclusion: There is no difference in CT ordering patterns for abdominal pain by PIT between HD5 and LD5. Likewise CT ordering patterns do not demonstrate a difference in percentage of clinically relevant CTs. © 2017 Published by Elsevier Inc.
1. Introduction Overcrowding in the emergency department is a well-studied, international phenomenon that is unfortunately increasing. As reported by Institute of Medicine in June 2006, while visits to the Emergency Department (ED) are increasing, the number of EDs and hospital beds are decreasing, leading to extended lengths of stay in the emergency department (also known as “boarding”) [1]. In 2008–2010 the mean wait time to see an Emergency Department physician increased from 45 min (1998–2000) to 55 min [2]. Overcrowding, increasing door-to-doctor (DTD) time, and length of stay (LOS) are concerning trends due to the association with decreased quality of care, higher morbidity and mortality, and decreased hospital reimbursement based on quality metrics [3, 4,5,6,7]. Specifically, length of stay has become an increasingly important topic and focus for hospital administration as it correlates with mortality as well as patient satisfaction [6,7,8]. Numerous factors have been cited and studied for possible intervention, including ED throughput. This refers to factors inherent to the visit itself, which increase length ⁎ Corresponding author. E-mail addresses: [email protected] (K. Matz), [email protected] (T. Britt), [email protected] (V. LaBond).
of stay. This represents opportunities for process improvement such as managing inadequate staffing, decreased ED beds, increasing acuity, and increase in use of imaging studies including computed tomography (CT) as well as increasing procedures [5]. One of the possible solutions to mitigate increased LOS has been the implementation of a physician in triage (PIT). This has proven to be able to reduce door-to-doc time, an important core measure tied to reimbursement, as well as reduce length of stay in the emergency department [9-16]. The PIT provides an initial assessment of the chief complaint and cursory physical exam enabling the physician to effectively triage the patient as well as order lab work and imaging studies. This provides the treating physician with study results with the idea that a prolonged ED course may be shortened by resulted studies reducing diagnostic uncertainty. This provides an interesting dilemma with regard to imaging studies ordered by PIT as this abbreviated exam may lead to investigations with independent impact on LOS. Of specific scrutiny is the ED physicians' increasing utilization of the CT scan and its correlation to longer LOS, as well as increase cost and radiation exposure [8,17]. Between the years 2000 and 2010 the utilization of advanced imaging studies, CT and MRI, increased by 3.1 times (from 5 to 17%) [2]. Eighteen percent of working age adults and 29% of ED visits by patients over 65 include advanced imaging of some kind [2]. This increasing use not only increases
http://dx.doi.org/10.1016/j.ajem.2017.02.003 0735-6757/© 2017 Published by Elsevier Inc.
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
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K. Matz et al. / American Journal of Emergency Medicine xxx (2017) xxx–xxx
cost, but also increases radiation exposure and cancer risk beyond what we estimate or may fully understand [18]. The ED offers immense diagnostic uncertainty, and ordering practices for ED physicians are influenced by a variety of stressors and individual biases unique to the emergency medicine provider and the environment in which they work [19,20]. ED physicians endure a high cognitive load due to a continuous flow of patients being evaluated in parallel, often with incomplete information, and the responsibility to rule out high risk diagnosis while maintaining the safety and throughput of the department [20]. The speed, breadth, and volume of critical thinking with the added pressure of throughput requires the ED physician to rely heavily on cognitive short cuts such as pattern recognition and heuristics [19,20,21]. And, while invaluable to the seasoned physician, these tools lend themselves to associated cognitive errors [19-22]. Additionally, studies in cognitive psychology suggest that this high cognitive load actually shapes decision-making and may lead to a less systematic approach and more risk adverse behavior [20,23]. Overcrowded days in the emergency department can exert a tremendous stress on the ED physician as the pressure to maintain throughput rises [20]. A 2016 study performed by Gorski et al. found that volume of the ED waiting room positively affected admission rates [24]. With special consideration to the PIT, this abbreviated evaluation, may lend itself to increased dependence on quick judgments based on unconscious pattern recognition, which may impact ED ordering patterns. Therefore, we designed a retrospective study to describe the CT ordering patterns of the PIT with relation to the ED volume as an environmental stressor. We hypothesized that the pressure of increasing throughput by the PIT on the busiest days in the emergency department leads to an increase in utilization of CT and therefore an increase in the rate of negative CT results. Furthermore, we believe, with each physician acting as their own control, ordering patterns may change on a busy day in the ED from even the same physician. Physician in triage offers a unique opportunity to examine ordering patterns of individual physicians and the effect of volume and throughput pressure. 2. Methods This study was approved by the hospital's institutional review board on 2/9/15. It was conducted in the Emergency Department of a 410 bed, community hospital located in a suburban area servicing Mid-Michigan. The hospital is a level II Trauma Center and Stroke Center also housing multiple medical and surgical residencies and fellowships including a dually (ACGME and AOA) accredited Emergency Medicine Residency. The Emergency Department is a 47 bed ED with over 64 000 annual ED visits and a 28% admission rate. The Emergency Department features a Physician in Triage, which was implemented in July 9, 2012 and is active daily 12-10 pm. The population to be studied was the emergency medicine physicians working in triage from January 1, 2013 to December 31, 2014. In order to define high and low volume shifts, ED census data was obtained from the ED quality dashboard and we defined a “high volume day” (HD5) as census being in the top 5% of the 2- year period and “low
Table 1 Primary study variables. Demographics
Visit details
Gender Age at presentation Race Comorbidities by ICD-9 Codes included in Charleston Index
Visit chief complaint ED door time (date and time) Disposition time (date and time)
ED Data ED daily census Triage physician
CT Details CT type ordered Ordering physician CT result
Table 2 Charlson cormorbidity index scoring criteria. Weight
Conditions
ICD-9 Codes
1
Myocardial infarct Congestive heart failure Peripheral vascular disease Dementia Cerebrovascular disease Chronic pulmonary disease Connective tissue disease Ulcer disease Mild liver disease Hemiplegia Moderate or severe renal disease Diabetes Any Tumor Leukemia Lymphoma Moderate or severe liver disease Metastatic solid tumor
410, 411 398, 402, 428 440–447 290, 291, 294 430–433, 435 491–493 710, 714, 725 531–534 571, 573 342, 434, 436, 437 403, 404, 580–586 250 140–195 204–208 200, 202, 203 070, 570, 572 196–199
2
3 6
volume day” (LD5) being in the bottom 5% of the 2-year period. We then used patient visit data from those days to determine whether the PIT physician ordered CTs, in order to evaluate their ordering patterns, as a group. In order to standardize our study, we narrowed the presenting chief complaint to that of abdominal pain. In this study we included all patients 18 to 100 years old presenting to the ED through triage with the chief complaint of abdominal pain during the hours of the PIT physician. Patients who arrived by EMS were excluded, as the triage physician does not evaluate them. Data points we collected for these patient encounters and are listed in Table 1. The modification of the Charleston Comorbidity Index is represented in Table 2 [25,26]. Patient's who underwent a CT ordered by a physician other than the triage physician such as a resident, physician extender, or a main ED physician were counted as not having a CT ordered by the PIT physician. Pearson correlation coefficients were computed to examine the bivariate relationship between ED volume and rate of CTs ordered in triage. In the initial power analysis, significance of p b 0.05 and power of at least 80% required a minimum of 300 cases for the sample size. We determined our study time period based on the power analysis and PIT volume. Once this data was extracted, we compared the rate of CT ordering by PIT between LD5 and HD5. Additionally, CT results were obtained and coded as positive or negative in order to compare the rate of positive CTs ordered by the PIT on LD5 and HD5. In order to do this, two separate physicians individually evaluated the results and scored them as positive or negative based on “clinically relevant” findings. Each physician determined this definition individually. Disagreement between the physicians was resolved by a third physician's evaluation. CT positive and negative rates were correlated with volume as secondary bivariate analysis. We then coded each PIT physician who evaluated patients on both LD5 and HD5 with a letter (A–L) in order to compare the data with
Table 3 Comparative findings between low and high volume groups.
Volume cutoff Average ED volume Age Gender Race Charleston index score Average length of stay
Lowest 5%
Highest 5%
≤145 patients 139.8 ± 4.6 42.9 ± 17.5 years 33.1% male 66.9% female 88.7% White 9.3% Black 1.37 ± 2.2 240.0 ± 107.42 min
≥204 patients 216.5 ± 12.6 44.8 ± 17.1 years 30.6% male 69.4% female 87.5% White 11.2% Black 1.69 ± 2.8 372.6 ± 153.1 min
p-Value b0.001 0.28 0.61 0.72 0.24 b0.001
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
K. Matz et al. / American Journal of Emergency Medicine xxx (2017) xxx–xxx
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Table 4 Percentage of positive computed tomographies ordered by PIT.
Total positive CTs ordered by PIT Total CTs ordered by PIT
Lowest 5%
Highest 5%
p-Value
21 (51.2%) 41
36 (47.4%) 76
0.74
Table 6 reports on LOS in minutes for both LD5 and HD5. As might be expected, the HD5 group did have a longer LOS independently. After analysis of the patient's length of stay was completed, we determined that those patients who received a CT did have increase LOS both on busy and slow days, even when ordered by the physician in triage (Table 7). Fig. 1. CT Utilization. CT rate among patients seen by PIT physicians for abdominal pain.
each physician acting as their own control. In this manner we were able to more closely compare individual physician ordering patterns in triage on LD5 compared to HD5 by determining their rate of CT ordering and rate of positive CT. Lastly, we compared the length of stay (LOS) between patients who had a CT ordered by the PIT physician and those who had not. LOS was determined by the difference between the ED door time and the physician disposition decision time. 3. Results From a review of PIT volumes, low-volume 5% days (LD5) was defined as 145 patients per day or less while high-volume 5% days (HD5) was defined as a total ED census of 204 patients or more. There were 383 patients who met these criteria, 151 presenting on LD5 and 232 presenting on HD5. There were no significant differences in demographics between volume groups (Table 3). The Charleston Index, which is a predictor of inpatient death by representation of disease burden, of the groups LD5 and HD5 was also similar [25,26]. When PIT CT ordering patterns were compared between LD5 and HD5 there was no statistical difference in the rate of CT ordering (Fig. 1). In our analysis of the individual PIT physicians, the majority of these physicians did increase their use of this imaging modality on HD5, however there were some physicians who decreased utilization (C, E, J, L) and some who did not change ordering pattern at all (K). These differences were also not statistically different (Fig. 2). “Clinically relevant” abdominal CTs were found on 48.1% of studies ordered on LD5 as compared to 43.1% on HD5 (p = 0.49). Those ordered by PIT, similarly had no statistical difference both collectively and individually (Tables 4 and 5).
4. Discussion Our study was designed to provide insight regarding CT ordering patterns of ED PIT and the effect volume pressures have on these patterns. This is important because while PIT is a strategy to increase throughput, most specifically on high volume days, an increase in CT utilization would decrease throughput, increase cost, and increase radiation exposure. We predicted that the pressure of moving the department would increase the ordering of CT in efforts to provide decreased diagnostic uncertainty and would thereby increase the incidence of negative CT scans. We utilized a specific group of patients to test our hypothesis. Abdominal pain represents 9% of all ED visits in patients over 18 and offers a vast differential with a high of diagnostic uncertainty [2]. Furthermore, CT imaging in the ED associated with abdominal pain represents an even higher correlation with increased LOS than other CT imaging [15]. In this study, though CTs were ordered at a slightly higher rate on HD5 the difference was not statistically significant. This finding may indicate no association between volume and CT ordering or it may be that the volume cutoffs were not sufficient to discriminate between the two groups. However, we identified the most disparate ends of our site's volume days. To show that this slight difference in ordering rates was significant would require huge volumes and such a small difference is not clinically significant enough to improve on costs and other resources. Importantly, with increased awareness of CT appropriateness, there was no evidence to suggest we had less “clinically significant” positive results on HD5 to suggest relative overuse on HD5 at our facility. This has reassuring implications for resource utilization, as our hypothesis was that the truncated examination would lead to increased ordering of CTs and incidence of negative results.
Fig. 2. Individual PIT ordering patterns. CTs ordered/total patients seen for abdominal pain by PIT physicians on the 5% low/high volume days (LD5;HD5). *N values are noted at the base of the bar graph and are representative of the number of CTs ordered per physician.
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
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K. Matz et al. / American Journal of Emergency Medicine xxx (2017) xxx–xxx
Conflict of interest/disclosure of funding
Table 5 Percent positive computed tomographies ordered by group.
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Lowest volume days
Highest volume days
PIT provider
Number (%) positive
Total ordered
Number (%) positive
Total ordered
p-Value
A B C D E F G H I J K L
3 (75%) 3 (75%) 3 (60%) 1 (100%) 4 (40%) 1 (100%) 1 (33.3%) – 1 (100%) 0 (0%) 2 (66.7%) 2 (66.7%)
4 4 5 1 10 1 3 0 1 2 3 3
7 (100%) 3 (33.3%) 5 (35.7%) 1 (100%) 3 (33.3%) 3 (60%) 8 (66.7%) 7 (0%) – – 2 (40%) –
7 9 14 1 9 5 12 7 0 0 5 0
NC NC 0.36 NC 0.77 NC NC NC NC NC NC NC
n is reported as number of CTs ordered on triaged patients with abdominal pain when seen by a particular physician in triage on LD5 and HD5 days. Percent is reported as percentage of “clinically relevant” CTs of reported ordered CTs. NC = Not Calculated. Table 6 Average length of stay by group.
LOS
Lowest 5%
Highest 5%
p-Value
240.0 ± 107.4 min n = 131
372.6 ± 153.1 min n = 197
b0.0001
Though not supported by the overall data, individual physician ordering patterns in relation to volume were variable. A majority of physicians ordered slightly more CTs on HD5 compared to LD5, however the difference was not significant. This trend may suggest that high-volume days affect CT ordering at the physician level but our study was not powered to demonstrate this or there may be no association at the individual level. Larger studies are needed to explore this potential relationship and, if any, whether physician characteristics play a role. Lastly, though this study implies volume is not impacting the PIT's collective ordering patterns, it is essential to note, that undergoing a CT ordered by the physician in triage was associated with increased length of stay. There was fallout of 55 of the total 383 patients, who did not have a disposition time available for analysis, representing 14% of the population, which is an important limitation. However, mean LOS increased by 65.69 min on LD5 and 57.25 min on HD5. Multiple variables influence ED throughput and length of stay. While employing the strategy of PIT reduces LOS and ordering patterns between variable volumes appear similar, CT imaging independently increases LOS. This highlights competing strategies between decreasing diagnostic uncertainty, thereby expediting the ED workup and ordering tests, which extend it. In conclusion, it does not appear that high volume days when compared with low volume days change ordering patterns of the physician in triage. While this is reassuring, there is more opportunity to explore decision making in the individual triage physician as it has defined impact on throughput. LOS will continue to be an opportunity to improve ED metrics and patient safety, and therefore careful consideration of time-consuming tests must continue to be part of an emergency evaluation in triage. Table 7 Average Length of Stay based on CT Ordering by Group. CT Ordered No
Yes
p-value
Lowest 5%
Highest 5%
p-value
204.3±96.1 minutes n=60
342.4±165.6 minutes n=93
0.0001
270.2±107.8 minutes n=71 0.0004
399.6±136.2 minutes n=104 0.009
0.0001
LOS
LOS
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[14] Subash F, Dunn F, McNicholl B. Team triage improves emergency department efficiency. Emerg Med J 2004;21:542–4. http://dx.doi.org/10.1136/emj.2002.003665. [15] Choi YF, Wong TW, Lau CC. Triage rapid initial assessment by doctor (TRIAD) improves waiting time and processing time of the emergency department. Emerg Med J 2006;23:262–5. http://dx.doi.org/10.1136/emj.2005.025254. [16] Rowe BH, Guo X, Villa-Roel C, Schull M, Holroyd B, Bullard M, et al. The role of triage liaison physicians on mitigating overcrowding in emergency departments: a systematic review. Acad Emerg Med 2001;18(2):111–20. http://dx.doi.org/10.1111/j. 1553-2712.2010.00984.x. [17] Kanzaria HK, Probst MA, Ponce NA, Hsai RY. The association between advanced diagnostic imaging and ED LOS. Am J Emerg Med 2014;32(10):1253–8. http://dx.doi. org/10.1016/j.ajem.2014.07.038. [18] Brenner DJ, Hall EJ. Computed tomography—an increasing source of radiation exposure. 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Acad Emerg Med 2016 Sept 19. http://dx.doi.org/10.1111/acem.13103 (Epub ahead of print). [25] Charlson ME, Pompei P, Ales KL, MacKenzie CR. A new method of classifying prognostic comorbidity in longitudinal studies: development and validation. J Chronic Dis 1987;40(5):373–83. http://dx.doi.org/10.1016/0021-9681(87)90171-8. [26] D'Hoore W, Bouckaert A, Tilquin C. Practical Considerations on the use of the Charleston Comorbidity Index with Administrative Data Bases. J Clin Epidemiol 1996;49(12):1429–33http://dx.doi.org/10.1016/S0895-4356.
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
Contents lists available at ScienceDirect
American Journal of Emergency Medicine journal homepage: www.elsevier.com/locate/ajem
CT ordering patterns for abdominal pain by physician in triage Kaitlyn Matz a,⁎, Todd Britt b, Virginia LaBond c a b c
Emergency Medicine, Genesys Regional Medical Center, One Genesys Parkway, Grand Blanc, MI 48439, USA Emergency Medicine, Genesys Regional Medical Center, Grand Blanc, MI, USA Emergency Medicine, Genesys Regional Medical Center, Grand Blanc, MI, USA
a r t i c l e
i n f o
Article history: Received 6 October 2016 Received in revised form 31 January 2017 Accepted 3 February 2017 Available online xxxx Keywords: Physician in triage Throughput Ordering patterns
a b s t r a c t Background: Overcrowding in the Emergency Department is a problem with many strategies for intervention such as the physician in triage (PIT). This brief evaluation is designed to minimize diagnostic uncertainty and expedite the work up when the patient is seen in the Emergency Department. We hypothesized that this would increase CT imaging which would be increasingly negative as the pressure to maintain throughput rises on busy days in the Emergency Department. Methods: We designed a retrospective study in which ordering patterns of Emergency physicians was explored using a group of patients with abdominal pain, presenting to triage in a 2 year period. We compared CT ordering rates on the 5% highest and lowest volume days (HD5 and LD5) and examined the bivariate relationship between volume and imaging utilization. Results: There was no statistical significance in the rate of CT's ordered collectively by PIT physicians on HD5 compared with LD5 with a p-value of 0.25. There is a trend toward increased utilization when each physician is compared to themselves on HD5 vs. LD5 but these were not statistically significant differences. The percentage of “clinically relevant” CTs was not determined to be different, but there was an increase in the LOS when a CT was ordered on both LD5 and HD5 (HD5 p-value 0.0004; LD5 p-value 0.009). Conclusion: There is no difference in CT ordering patterns for abdominal pain by PIT between HD5 and LD5. Likewise CT ordering patterns do not demonstrate a difference in percentage of clinically relevant CTs. © 2017 Published by Elsevier Inc.
1. Introduction Overcrowding in the emergency department is a well-studied, international phenomenon that is unfortunately increasing. As reported by Institute of Medicine in June 2006, while visits to the Emergency Department (ED) are increasing, the number of EDs and hospital beds are decreasing, leading to extended lengths of stay in the emergency department (also known as “boarding”) [1]. In 2008–2010 the mean wait time to see an Emergency Department physician increased from 45 min (1998–2000) to 55 min [2]. Overcrowding, increasing door-to-doctor (DTD) time, and length of stay (LOS) are concerning trends due to the association with decreased quality of care, higher morbidity and mortality, and decreased hospital reimbursement based on quality metrics [3, 4,5,6,7]. Specifically, length of stay has become an increasingly important topic and focus for hospital administration as it correlates with mortality as well as patient satisfaction [6,7,8]. Numerous factors have been cited and studied for possible intervention, including ED throughput. This refers to factors inherent to the visit itself, which increase length ⁎ Corresponding author. E-mail addresses: [email protected] (K. Matz), [email protected] (T. Britt), [email protected] (V. LaBond).
of stay. This represents opportunities for process improvement such as managing inadequate staffing, decreased ED beds, increasing acuity, and increase in use of imaging studies including computed tomography (CT) as well as increasing procedures [5]. One of the possible solutions to mitigate increased LOS has been the implementation of a physician in triage (PIT). This has proven to be able to reduce door-to-doc time, an important core measure tied to reimbursement, as well as reduce length of stay in the emergency department [9-16]. The PIT provides an initial assessment of the chief complaint and cursory physical exam enabling the physician to effectively triage the patient as well as order lab work and imaging studies. This provides the treating physician with study results with the idea that a prolonged ED course may be shortened by resulted studies reducing diagnostic uncertainty. This provides an interesting dilemma with regard to imaging studies ordered by PIT as this abbreviated exam may lead to investigations with independent impact on LOS. Of specific scrutiny is the ED physicians' increasing utilization of the CT scan and its correlation to longer LOS, as well as increase cost and radiation exposure [8,17]. Between the years 2000 and 2010 the utilization of advanced imaging studies, CT and MRI, increased by 3.1 times (from 5 to 17%) [2]. Eighteen percent of working age adults and 29% of ED visits by patients over 65 include advanced imaging of some kind [2]. This increasing use not only increases
http://dx.doi.org/10.1016/j.ajem.2017.02.003 0735-6757/© 2017 Published by Elsevier Inc.
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
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cost, but also increases radiation exposure and cancer risk beyond what we estimate or may fully understand [18]. The ED offers immense diagnostic uncertainty, and ordering practices for ED physicians are influenced by a variety of stressors and individual biases unique to the emergency medicine provider and the environment in which they work [19,20]. ED physicians endure a high cognitive load due to a continuous flow of patients being evaluated in parallel, often with incomplete information, and the responsibility to rule out high risk diagnosis while maintaining the safety and throughput of the department [20]. The speed, breadth, and volume of critical thinking with the added pressure of throughput requires the ED physician to rely heavily on cognitive short cuts such as pattern recognition and heuristics [19,20,21]. And, while invaluable to the seasoned physician, these tools lend themselves to associated cognitive errors [19-22]. Additionally, studies in cognitive psychology suggest that this high cognitive load actually shapes decision-making and may lead to a less systematic approach and more risk adverse behavior [20,23]. Overcrowded days in the emergency department can exert a tremendous stress on the ED physician as the pressure to maintain throughput rises [20]. A 2016 study performed by Gorski et al. found that volume of the ED waiting room positively affected admission rates [24]. With special consideration to the PIT, this abbreviated evaluation, may lend itself to increased dependence on quick judgments based on unconscious pattern recognition, which may impact ED ordering patterns. Therefore, we designed a retrospective study to describe the CT ordering patterns of the PIT with relation to the ED volume as an environmental stressor. We hypothesized that the pressure of increasing throughput by the PIT on the busiest days in the emergency department leads to an increase in utilization of CT and therefore an increase in the rate of negative CT results. Furthermore, we believe, with each physician acting as their own control, ordering patterns may change on a busy day in the ED from even the same physician. Physician in triage offers a unique opportunity to examine ordering patterns of individual physicians and the effect of volume and throughput pressure. 2. Methods This study was approved by the hospital's institutional review board on 2/9/15. It was conducted in the Emergency Department of a 410 bed, community hospital located in a suburban area servicing Mid-Michigan. The hospital is a level II Trauma Center and Stroke Center also housing multiple medical and surgical residencies and fellowships including a dually (ACGME and AOA) accredited Emergency Medicine Residency. The Emergency Department is a 47 bed ED with over 64 000 annual ED visits and a 28% admission rate. The Emergency Department features a Physician in Triage, which was implemented in July 9, 2012 and is active daily 12-10 pm. The population to be studied was the emergency medicine physicians working in triage from January 1, 2013 to December 31, 2014. In order to define high and low volume shifts, ED census data was obtained from the ED quality dashboard and we defined a “high volume day” (HD5) as census being in the top 5% of the 2- year period and “low
Table 1 Primary study variables. Demographics
Visit details
Gender Age at presentation Race Comorbidities by ICD-9 Codes included in Charleston Index
Visit chief complaint ED door time (date and time) Disposition time (date and time)
ED Data ED daily census Triage physician
CT Details CT type ordered Ordering physician CT result
Table 2 Charlson cormorbidity index scoring criteria. Weight
Conditions
ICD-9 Codes
1
Myocardial infarct Congestive heart failure Peripheral vascular disease Dementia Cerebrovascular disease Chronic pulmonary disease Connective tissue disease Ulcer disease Mild liver disease Hemiplegia Moderate or severe renal disease Diabetes Any Tumor Leukemia Lymphoma Moderate or severe liver disease Metastatic solid tumor
410, 411 398, 402, 428 440–447 290, 291, 294 430–433, 435 491–493 710, 714, 725 531–534 571, 573 342, 434, 436, 437 403, 404, 580–586 250 140–195 204–208 200, 202, 203 070, 570, 572 196–199
2
3 6
volume day” (LD5) being in the bottom 5% of the 2-year period. We then used patient visit data from those days to determine whether the PIT physician ordered CTs, in order to evaluate their ordering patterns, as a group. In order to standardize our study, we narrowed the presenting chief complaint to that of abdominal pain. In this study we included all patients 18 to 100 years old presenting to the ED through triage with the chief complaint of abdominal pain during the hours of the PIT physician. Patients who arrived by EMS were excluded, as the triage physician does not evaluate them. Data points we collected for these patient encounters and are listed in Table 1. The modification of the Charleston Comorbidity Index is represented in Table 2 [25,26]. Patient's who underwent a CT ordered by a physician other than the triage physician such as a resident, physician extender, or a main ED physician were counted as not having a CT ordered by the PIT physician. Pearson correlation coefficients were computed to examine the bivariate relationship between ED volume and rate of CTs ordered in triage. In the initial power analysis, significance of p b 0.05 and power of at least 80% required a minimum of 300 cases for the sample size. We determined our study time period based on the power analysis and PIT volume. Once this data was extracted, we compared the rate of CT ordering by PIT between LD5 and HD5. Additionally, CT results were obtained and coded as positive or negative in order to compare the rate of positive CTs ordered by the PIT on LD5 and HD5. In order to do this, two separate physicians individually evaluated the results and scored them as positive or negative based on “clinically relevant” findings. Each physician determined this definition individually. Disagreement between the physicians was resolved by a third physician's evaluation. CT positive and negative rates were correlated with volume as secondary bivariate analysis. We then coded each PIT physician who evaluated patients on both LD5 and HD5 with a letter (A–L) in order to compare the data with
Table 3 Comparative findings between low and high volume groups.
Volume cutoff Average ED volume Age Gender Race Charleston index score Average length of stay
Lowest 5%
Highest 5%
≤145 patients 139.8 ± 4.6 42.9 ± 17.5 years 33.1% male 66.9% female 88.7% White 9.3% Black 1.37 ± 2.2 240.0 ± 107.42 min
≥204 patients 216.5 ± 12.6 44.8 ± 17.1 years 30.6% male 69.4% female 87.5% White 11.2% Black 1.69 ± 2.8 372.6 ± 153.1 min
p-Value b0.001 0.28 0.61 0.72 0.24 b0.001
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
K. Matz et al. / American Journal of Emergency Medicine xxx (2017) xxx–xxx
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Table 4 Percentage of positive computed tomographies ordered by PIT.
Total positive CTs ordered by PIT Total CTs ordered by PIT
Lowest 5%
Highest 5%
p-Value
21 (51.2%) 41
36 (47.4%) 76
0.74
Table 6 reports on LOS in minutes for both LD5 and HD5. As might be expected, the HD5 group did have a longer LOS independently. After analysis of the patient's length of stay was completed, we determined that those patients who received a CT did have increase LOS both on busy and slow days, even when ordered by the physician in triage (Table 7). Fig. 1. CT Utilization. CT rate among patients seen by PIT physicians for abdominal pain.
each physician acting as their own control. In this manner we were able to more closely compare individual physician ordering patterns in triage on LD5 compared to HD5 by determining their rate of CT ordering and rate of positive CT. Lastly, we compared the length of stay (LOS) between patients who had a CT ordered by the PIT physician and those who had not. LOS was determined by the difference between the ED door time and the physician disposition decision time. 3. Results From a review of PIT volumes, low-volume 5% days (LD5) was defined as 145 patients per day or less while high-volume 5% days (HD5) was defined as a total ED census of 204 patients or more. There were 383 patients who met these criteria, 151 presenting on LD5 and 232 presenting on HD5. There were no significant differences in demographics between volume groups (Table 3). The Charleston Index, which is a predictor of inpatient death by representation of disease burden, of the groups LD5 and HD5 was also similar [25,26]. When PIT CT ordering patterns were compared between LD5 and HD5 there was no statistical difference in the rate of CT ordering (Fig. 1). In our analysis of the individual PIT physicians, the majority of these physicians did increase their use of this imaging modality on HD5, however there were some physicians who decreased utilization (C, E, J, L) and some who did not change ordering pattern at all (K). These differences were also not statistically different (Fig. 2). “Clinically relevant” abdominal CTs were found on 48.1% of studies ordered on LD5 as compared to 43.1% on HD5 (p = 0.49). Those ordered by PIT, similarly had no statistical difference both collectively and individually (Tables 4 and 5).
4. Discussion Our study was designed to provide insight regarding CT ordering patterns of ED PIT and the effect volume pressures have on these patterns. This is important because while PIT is a strategy to increase throughput, most specifically on high volume days, an increase in CT utilization would decrease throughput, increase cost, and increase radiation exposure. We predicted that the pressure of moving the department would increase the ordering of CT in efforts to provide decreased diagnostic uncertainty and would thereby increase the incidence of negative CT scans. We utilized a specific group of patients to test our hypothesis. Abdominal pain represents 9% of all ED visits in patients over 18 and offers a vast differential with a high of diagnostic uncertainty [2]. Furthermore, CT imaging in the ED associated with abdominal pain represents an even higher correlation with increased LOS than other CT imaging [15]. In this study, though CTs were ordered at a slightly higher rate on HD5 the difference was not statistically significant. This finding may indicate no association between volume and CT ordering or it may be that the volume cutoffs were not sufficient to discriminate between the two groups. However, we identified the most disparate ends of our site's volume days. To show that this slight difference in ordering rates was significant would require huge volumes and such a small difference is not clinically significant enough to improve on costs and other resources. Importantly, with increased awareness of CT appropriateness, there was no evidence to suggest we had less “clinically significant” positive results on HD5 to suggest relative overuse on HD5 at our facility. This has reassuring implications for resource utilization, as our hypothesis was that the truncated examination would lead to increased ordering of CTs and incidence of negative results.
Fig. 2. Individual PIT ordering patterns. CTs ordered/total patients seen for abdominal pain by PIT physicians on the 5% low/high volume days (LD5;HD5). *N values are noted at the base of the bar graph and are representative of the number of CTs ordered per physician.
Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003
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K. Matz et al. / American Journal of Emergency Medicine xxx (2017) xxx–xxx
Conflict of interest/disclosure of funding
Table 5 Percent positive computed tomographies ordered by group.
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Lowest volume days
Highest volume days
PIT provider
Number (%) positive
Total ordered
Number (%) positive
Total ordered
p-Value
A B C D E F G H I J K L
3 (75%) 3 (75%) 3 (60%) 1 (100%) 4 (40%) 1 (100%) 1 (33.3%) – 1 (100%) 0 (0%) 2 (66.7%) 2 (66.7%)
4 4 5 1 10 1 3 0 1 2 3 3
7 (100%) 3 (33.3%) 5 (35.7%) 1 (100%) 3 (33.3%) 3 (60%) 8 (66.7%) 7 (0%) – – 2 (40%) –
7 9 14 1 9 5 12 7 0 0 5 0
NC NC 0.36 NC 0.77 NC NC NC NC NC NC NC
n is reported as number of CTs ordered on triaged patients with abdominal pain when seen by a particular physician in triage on LD5 and HD5 days. Percent is reported as percentage of “clinically relevant” CTs of reported ordered CTs. NC = Not Calculated. Table 6 Average length of stay by group.
LOS
Lowest 5%
Highest 5%
p-Value
240.0 ± 107.4 min n = 131
372.6 ± 153.1 min n = 197
b0.0001
Though not supported by the overall data, individual physician ordering patterns in relation to volume were variable. A majority of physicians ordered slightly more CTs on HD5 compared to LD5, however the difference was not significant. This trend may suggest that high-volume days affect CT ordering at the physician level but our study was not powered to demonstrate this or there may be no association at the individual level. Larger studies are needed to explore this potential relationship and, if any, whether physician characteristics play a role. Lastly, though this study implies volume is not impacting the PIT's collective ordering patterns, it is essential to note, that undergoing a CT ordered by the physician in triage was associated with increased length of stay. There was fallout of 55 of the total 383 patients, who did not have a disposition time available for analysis, representing 14% of the population, which is an important limitation. However, mean LOS increased by 65.69 min on LD5 and 57.25 min on HD5. Multiple variables influence ED throughput and length of stay. While employing the strategy of PIT reduces LOS and ordering patterns between variable volumes appear similar, CT imaging independently increases LOS. This highlights competing strategies between decreasing diagnostic uncertainty, thereby expediting the ED workup and ordering tests, which extend it. In conclusion, it does not appear that high volume days when compared with low volume days change ordering patterns of the physician in triage. While this is reassuring, there is more opportunity to explore decision making in the individual triage physician as it has defined impact on throughput. LOS will continue to be an opportunity to improve ED metrics and patient safety, and therefore careful consideration of time-consuming tests must continue to be part of an emergency evaluation in triage. Table 7 Average Length of Stay based on CT Ordering by Group. CT Ordered No
Yes
p-value
Lowest 5%
Highest 5%
p-value
204.3±96.1 minutes n=60
342.4±165.6 minutes n=93
0.0001
270.2±107.8 minutes n=71 0.0004
399.6±136.2 minutes n=104 0.009
0.0001
LOS
LOS
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Please cite this article as: Matz K, et al, CT ordering patterns for abdominal pain by physician in triage, American Journal of Emergency Medicine (2017), http://dx.doi.org/10.1016/j.ajem.2017.02.003