The Need for Surgery in Acute Abdominal Pain: A Randomized Study of Abdominal Computed Tomography
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1 The Need for Surgery in Acute Abdominal Pain: A Randomized Study of Abdominal Computed Tomography PETRI JUVONEN 1,2, TIINA LEHTIMÄKI 3, MATTI ESKELINEN 1,2, IMRE ILVES 1, RITVA VANNINEN 2,3, PEKKA MIETTINEN 1 and HANNU PAAJANEN 1,2 Departments of 1 Surgery, and 3 Clinical Radiology, Kuopio University Hospital, Kuopio, Finland; 2 School of Medicine, University of Eastern Finland, Kuopio, Finland Abstract. Aim: To assess the need for surgical treatment in patients with acute abdominal pain in a prospective randomized study. Patients and Methods: Initially 203 patients with acute abdominal pain were randomized to the routine abdominal computed tomography CT (rct, n=118), or selective abdominal CT group (sct, n=85) over a period of 16 months. Ninety-three of the randomized patients (45.8%) underwent the study design and were reached for follow-up at three months. Results: Diagnostic accuracy improved significantly in the rct group (p<0.001). The surgeon's assessment of the need for surgery changed more often in the rct group than in the sct group (78.7% vs. 46.9%, p=0.002). The confidence to treat operatively increased significantly in the rct vs. the sct group (65.6% vs. 40.6%, p=0.028). The rct was the only independent parameter for the change of the assessment of surgery. Conclusion: Routine CT allows for more confidence in decision making for the surgical treatment of patients with acute abdominal pain. The major methods used to investigate the need for surgery in patients with acute abdominal pain (AAP) are clinical examination, laboratory investigations, abdominal ultrasonography, and computed tomography (CT) (1-5). The advantage of CT in the diagnosis of the cause of AAP over other diagnostic tools has been shown in earlier studies and abdominal CT is quite a routine method in emergency departments (EDs) (6-9). However, there are surgical EDs where abdominal CT is not available 24 h a day. Correspondence to: Petri Juvonen, MD, Ph.D., Department of Surgery, Kuopio University Hospital, P.O. Box 100, KYS, Finland. Tel: , Fax: , petri.juvonen@kuh.fi Key Words: Acute abdomen, diagnostic accuracy, routine CT, selective CT, need for surgery, decision making, randomized controlled study. Furthermore, it is questionable whether the CT should be performed for every patient with AAP at hospital admission (10, 11). Sala et al. in a randomized trial showed that early routine CT improved the diagnostic accuracy in patients with non-specific abdominal pain, reducing unnecessary operations (12), but the benefits of routine abdominal CT in reducing hospital admissions and shortening hospital stays are controversial. The impact of early abdominal CT on the mortality or the decision for emergency laparotomy in patients with AAP is also yet to be established. To our knowledge, the use of the routine vs. selective abdominal CT in the assessment of the need for surgery in the patients with AAP is rarely reported. This study s hypothesis was that patients with AAP undergoing routine abdominal CT would more often require change in the assessment of the need for surgery than would patients with selective abdominal CT. We therefore designed the present study to investigate the impact of the abdominal CT in patients with AAP. Patients and Methods This study was a sub-analysis of a prospective, randomized, controlled single-center trial conducted at a university teaching hospital with approximately 11,000 annual surgical ED visits. The methods have been described in our earlier report (13). The study was approved by the Research Ethics Committee of the Hospital District of Northern Savo, Kuopio, Finland (DNRO 82/2008, June 25, 2008), and was registered in the ClinicalTrials.gov database (ClinicalTrials.gov, Identifier: NCT , Consort diagram, Figure 1). The primary end-points were correct diagnosis within 24 h after hospital admission and assessment of the need for surgery. The golden standard for correct diagnosis was the 3 months of followup. The secondary end-points were the frequency of discharge from the ED, and the length of the hospital stay. Study design. After obtaining written informed consent, the recruited patients were randomly assigned to either routine (rct) or selective (sct) abdominal CT groups. The on-call surgeon using closed envelopes performed randomization. Patients included had their X/2014 $
2 Figure 1. The study flow chart. CT: Computed tomography. medical history recorded, physical examination, a fixed set of laboratory tests, and a pain intensity score using a visual analog scale (VAS). All patients with upper abdominal pain had a chest radiograph and patients over the age of 45 years had a routine electrocardiogram in order to exclude cardiogenic and intra-thoracic causes for acute pain. Based on this information, the initial diagnosis was set down, and the estimation of the need for the possible surgical therapy was recorded with the five point Likert scale: strongly certain: 1; certain: 2; unclear: 3; uncertain: 4; strongly uncertain: 5. All patients in the rct group underwent contrast-enhanced abdomino-pelvic CT imaging within 24 hours of admission. The CT method is shown in our earlier report (13). In the sct group, abdominal CT was performed if considered necessary. Other imaging investigations were performed based on clinical grounds: ultrasonography for patients with suspected cholecystitis, and plain radiographs for patients with suspected bowel obstruction. The second assessment of diagnosis (preoperative diagnosis) of the patient and the need for surgery was established in both groups within 24 h after randomization using the same formula as in the initial assessment. The change in the assessment for the surgical treatment was established as a change in the Likert value between the two time points. The change in the assessment was recorded as being more confident when the Likert value changed from 3 to 1, 2, 4 or 5, or from 2 or 4 to 1 or 5. The treatment of the patients followed general surgical principles and was similar in both study groups (13). The final diagnosis of the cause of AAP was a summary of clinical and imaging findings. It was defined as the diagnosis at discharge with definite cases. For patients with non-specific abdominal pain, the final diagnosis was confirmed by examinations at three months of follow-up. The threemonth time frame was chosen in order to detect possible complications. The group of the investigators checked the reliability of all diagnoses. A total of 1600 patients with AAP attended the ED during the study period of January 2009 to May The present study of the 203 randomized patients focuses on the impact of the routine vs. selective abdominal CT on the surgical decision-making and the need for possible surgical therapy at the 24-h time-point after randomization. Ninety-three (45.8%) of the randomized patients followed the study design and were reached for follow-up at three months (Figure 1). Statistical analysis. The descriptive statistics include the median and range for continuous variables, and the absolute and relative frequencies for the nominal variables. The proportions between the groups were compared with the x 2 test or in small numbers with the Fisher s exact test, and within the groups with the McNemar test. The Mann-Whitney U-test was used to compare the continuous variables. Multiple logistic regression analysis for the binary outcome was performed, and an odds ratio including the 95% asymptotic confidence interval was calculated for the independent variables. A value of p<0.05 defined a statistically significant 306
3 Juvonen et al: CT and Acute Abdominal Surgery difference. The data analysis was carried out using SPSS for Windows, version 19.0 (SPSS, Chicago, IL, USA). Results The two study groups were comparable for gender and age (Table I). No difference was found between the study groups in self-assessed pain intensity [median VAS score (range)=6 (1-10) and 6 (2-10), respectively, p=0.475). Abdominal CT was performed in 17 patients (53.1%) of the sct group. The distribution of the final diagnoses is listed in Table I. Thirty-three patients had operations: 22 patients (36.0%) in the rct group and 11 patients (34.4%) in the sct group (p=0.871). Acute appendicitis was the most common operative diagnosis and accounted for 63.6% of the diagnoses in both groups (14/22 and 7/11, respectively). None of the operated patients had a diagnosis of NSAP. The median length of hospital stay was 1 day (range 0-31 days) in the rct group, and 2 days (range 0-19 days) in the sct group (p=0.373). The number of patients discharged from the ED was comparable in the groups [26/61 (42.6%) and 13/32 (40.6%), respectively; p=0.664]. There was no mortality in the study groups. The results of the diagnostic accuracy are presented in Table II. There was no difference between the groups in the diagnostic accuracy of initial diagnoses and this reflects the similarity of the groups before randomization (p=0.833). The on-call surgeon's assessment of the need for surgical therapy changed between the time-points significantly more often in the rct-than in the sct-group [48/61 (78.7%) and 15/32 (46.9%); p=0.002]. When we report the change of certainty/uncertainty of the surgical therapy, the Likert scale shows that the confidence to treat operatively or not increased significantly in the rct vs. sct group (65.6% vs. 40.6%, p=0.028). In the multiple logistic regression analysis, the independent parameters for the accuracy of preoperative diagnosis were: being in the rct group, younger age (<65 years), and correct initial diagnosis. The only independent parameter predictive of the change of the surgeon s assessment for surgery was being in the rct group (Table III). Discussion The present study compared the routine and selective abdominal CT in the diagnosis of the cause of AAP. Our main finding was that routine CT changed the surgeon s assessment for treatment of patients with AAP and gave additional confidence to their surgical decision-making. The routine use of the CT for every patient with AAP resulted in more accurate diagnoses than the selective use of abdominal CT, but it did not affect patient mortality or the frequency of the emergency laparotomy. The on-call surgeon changed the assessment of the need for surgical treatment for the patient Table I. The characteristics and final diagnoses of the study groups. Routine CT (n=61) Selective CT p-value (n=32) Characteristic Gender (male/female) 31/30 14/ Median age (range), years 52 (18-89) 55 (22-88) Age category (<65/ 65 years) 43/18 20/ Final diagnosis NSAP 12 (19.7%) 7 (21.9%) Acute appendicitis 14 (23.0%) 7 (21.9%) Acute diverticulitis 11 (18.0%) 6 (18.8%) Pancreatitis 5 (8.2%) 3 (9.4%) Biliary disease 5 (8.2%) 2 (6.3%) Bowel obstruction 4 (6.6%) 2 (6.3%) Urological disease 1 (1.6%) Inflammatory bowel disease 2 (3.3%) 1 (3.1%) Malignancy 2 (3.3%) 1 (3.1%) Vascular disease 1 (1.6%) Thoracic disease 1 (1.6%) 3 (9.4%) Other 1 3 (4.9%) Data are median (range) or number of cases (percentages). NSAP: Nonspecific abdominal pain; 1 constipation n=1, small bowel perforation n=1, cecal hemorrhage n=1. in the rct group more often, which may reflect more specific treatment and better diagnostic work-up of the patients with AAP. The accuracy of the clinical diagnosis was about 50% after the first contact (initial diagnosis) in both study groups and after 24 h, it rose to 86% in the rct group. Similar accuracy figures have been reported in EDs. The old clinical practice of the cautious follow-up of patients with AAP with repetition of physical examination is questioned by the requirement for efficacy in healthcare. The correct diagnosis and treatment have determined quickly and safely (14, 15). We did not find any difference in the discharge rate from the ED or the length of the hospital stay between the study groups. In the randomized studies, no significant difference in hospital stay was found either (12, 16). Moreover in this study, there were no unnecessary operations in the sct group. Therefore, despite the better diagnostic accuracy in the rct group, selective CT imaging was also sufficiently safe and accurate here. In the multiple regression analysis of our results, routine CT imaging, and the age of the patient had the most predictive impact on the diagnostic accuracy. We found that patients under 65 years more often had a correct diagnosis than did older patients. In addition, there was a tendency for the improvement in diagnosis at the 24-h time-point in the rct group, especially among older patients when compared to the sct group. However, this was not statistically significant due to the low number of patients. The diagnosis of the cause of 307
4 Table II. Diagnostic accuracy of computed tomography (CT) and the change in the assessment of treatment. Routine CT (n=61) Selective CT (n=32) p-value a Initial diagnosis Correct: 31 (51.7) Correct: 17 (53.1) Incorrect: 30 (48.3) Incorrect: 15 (46.9) Preoperative diagnosis Correct: 53 (86.9) b Correct: 22 (68.8) c Incorrect: 8 (13.1) Incorrect: 10 (31.2) Change in the assessment of the need for surgery 48 (78.7) 15 (46.9) a Data are number of cases (percentage). Significance within group: at b p<0.001 and c p= AAP is more difficult in elderly patients and CT diagnostics is also more challenging in the elderly with AAP (17, 18). Acute appendicitis was the most common diagnosis in younger patients, whereas the older patients had clinically unpredictable diagnoses, such as malignancy and vascular disease. In this consideration, abdominal CT could be recommended routinely for elderly patients. The additional radiation exposure may also be more acceptable to elderly patients. We have recently shown that routine CT results in higher costs than the selective use of CT, and therefore routine CT cannot be considered cost-effective in diagnosis of the cause of AAP (13). The present study of the group of patients with repeated assessments for diagnosis and need for the surgical therapy indicates that routine CT does increase the diagnostic accuracy in AAP. However, it does not reduce the number of hospital admissions, nor the length of the hospital stay. In this regard, it may not have an immediate effect on reducing costs. To conclude, the rather good diagnostic accuracy of routine CT in patients with AAP also improved surgeon s confidence in their treatment decisions, but it was not able to reduce the use of hospital resources. The strength of our study is that it was a prospective, randomized, controlled study design. Although the study groups were rather small, they were homogenous in terms of age and gender, and the relative frequencies of correct diagnoses were similar in both groups before randomization. We can assume that this study provides a representative cross-section of the use of abdominal CT in ED work-up. Acknowledgements This study was funded by the EVO-funding of the Kuopio University Hospital. References 1 Sitter H, Hoffmann S, Hassan I and Zielke A: Diagnostic score in appendicitis. Validation of a diagnostic score (Eskelinen score) in patients in whom acute appendicitis is suspected. Langenbecks Arch Surg 389: , Lintula H, Kokki H, Pulkkinen J, Kettunen R, Gröhn O and Eskelinen M: Diagnostic score in acute appendicitis. Validation Table III. The multiple logistic regression analysis of the independent parameters predicting the preoperative diagnosis and the change of the assessment of the need for surgery. Odds ratio (confidence interval 95%) p-value Preoperative diagnosis Routine CT group ( ) Correct initial diagnosis ( ) Age group (<65yrs) ( ) Change of assessment Routine CT group ( ) of a diagnostic score (Lintula score) for adults with suspected appendicitis. Langenbecks Arch Surg 395: , Eskelinen M and Lipponen P: Usefulness index in nonspecific abdominal pain an aid in the diagnosis? Scand J Gastroenterol 47: , Tepel J, Sommerfeld A, Klomp Hj, Kapischke M, Eggert A and Kremer B: Prospective evaluation of diagnostic modalities in suspected acute appendicitis. Langenbecks Arch Surg 389: , Erdem H, Cetinkunar S, Das K, Reyhan E, Deger C, Aziret M, Bozkurt H, Uzun S, Sözen S and Irkörucu O: Alvarado, Eskelinen, Ohhmann and Raja Isteri Pengiran Anak Saleha Appendicitis scores for diagnosis of acute appendicitis. World J Gastroenterol 19: , Siewert B, Raptopoulos V, Mueller MF, Rosen MP and Steer M: Impact of CT on diagnosis and management of acute abdomen in patients initially treated without surgery. Am J Roentgen 168: , Broder J and Warshauer DM: Increasing utilization of computed tomography in the adult emergency department, Emerg Radiol 13: 25-30, Rao PM, Rhea JT, Novelline RA, Mostafavi AA and McCabe CJ: Effect of computed tomography of the appendix on treatment of patients and use of hospital resources. N Engl J Med 338: , Doria AS, Moineddin R, Kellenberger CJ, Epelman M, Beyene J, Schuh S, Babyn PS and Dick PT: US or CT for diagnosis of appendicitis in children and adults? A meta-analysis. Radiology 241: 83-94,
5 Juvonen et al: CT and Acute Abdominal Surgery 10 Hong JJ, Cohn SM, Ekeh AP, Newman M, Salama M, Leblang SD and Miami Appendicitis Group: A prospective randomized study of clinical assessment versus computed tomography for the diagnosis of acute appendicitis. Surg Infect (Larchmt) 4: , Pritchett CV, Levinsky NC, Ha YP, Dembe AE and Steinberg SM: Management of acute appendicitis: The impact of CT scanning on the bottom line. J Am Coll Surg 210: , Sala E, Watson CJE, Beadsmoore C, Groot-Wassink T, Fanshawe TR, Smith JC, Bradley A, Palmer CR, Shaw A and Dixon AK: A randomized, controlled trial of routine early abdominal compute tomography in patients presenting with non-specific acute abdominal pain. Clinical Radiology 62: , Lehtimäki T, Juvonen P, Valtonen H, Miettinen P, Paajanen H and Vanninen R: Impact of routine contrast-enhanced CT on costs and use of hospital resources in patients with acute abdomen. Results of a randomized trial. Eur Radiol 23: , Cubas RF, Gómez NR, Rodriguez S, Wanis M, Sivanandam A and Garberoglio CA: Outcomes in the management of appendicitis and cholecystitis in the setting of a new acute care surgery service model: impact on timing and cost. J Am Coll Surg 215: , Agnoletti V, Buccioli M, Padovani E, Corso RM, Perger P, Piraccini E, Orelli RL, Maitan S, Dell amore D, Garcea D, Vicini C, Montella TM and Gambale G: Operating room data management: improving efficiency and safety in a surgical block. BMC Surg 13: 7, Ng CS, Watson CJ, Palmer CR, See TC, Beharry NA, Housden BA, Bradley JA and Dixon AK: Evaluation of early abdominopelvic computed tomography in patients with acute abdominal pain of unknown cause: prospective randomised study. BMJ 325: 1387, Eskelinen M, Ikonen J and Lipponen P: The value of historytaking, physical examination, and computer assistance in the diagnosis of acute appendicitis in patients more than 50 years old. Scand J Gastroenterol 30: , Miettinen P, Pasanen P, Lahtinen J and Alhava E: Acute abdominal pain in adults. Ann Chir Gynaecol 85: 5-9, Received February 18, 2014 Revised March 5, 2014 Accepted March 6,
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