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      Ultrasound surface probe as a screening method for evaluating the patients with blunt abdominal trauma

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          Abstract

          Background:

          Blunt abdominal trauma is one of the causes of mortality in emergency department. Free fluid in the abdomen due to intra-abdominal blunt trauma can be determined by the surface probe of ultrasound. Since the importance of this free fluid in hemodynamic stable patients with blunt trauma is associated with the unknown outcome for surgeons, this study was performed to evaluate the role of ultrasound surface probe as a screening method in evaluating the patients with blunt abdominal trauma.

          Materials and Methods:

          A descriptive-analytical study was done on 45 patients with blunt abdominal trauma and hemodynamic stability. The patients were evaluated twice during the three-hours, including repeated ultrasound surface probe and clinical examinations. Computerized tomography was also performed. The patients were divided based on the amount of the free fluid in the abdomen during the evaluations into two groups: Fixed or increased, and decreased free fluid. The results of the different evaluated methods were compared using the sensitivity and specificity.

          Results:

          From 17 patients with CT abnormalities, free fluid increased in 14 patients (82.4%). Free fluid was decreased in three patients who were discharged well from the surgery service without any complication. Surface probe in prognosis detection had a sensitivity of 82.4% and specificity of 92.9%. The percentage of false positive and negative ultrasound compared with CT scan was 7.1% and 17.6%. Also, positive and negative predictive value of the ultrasound with surface probe was 87.5% and 89.7% respectively.

          Conclusion:

          The use of the ultrasound with surface probe in the diagnosis of free fluid in blunt abdominal trauma in hemodynamic stable patients can be considered as a useful screening method.

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          Most cited references26

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          Current diagnostic approaches lack sensitivity in the diagnosis of perforated blunt small bowel injury: analysis from 275,557 trauma admissions from the EAST multi-institutional HVI trial.

          Samir Fakhry, Dorraine D Watts, Fred A Luchette (2003)
          Blunt SBI is infrequent and its diagnosis may be difficult, especially in the face of confounding variables. The purpose of this study was to evaluate methods for making the diagnosis of blunt SBI. Patients with blunt small bowel injury (SBI) were identified from the registries of 95 trauma centers for a 2-year period (1998-1999). Patients with SBI (cases) were matched by age and Injury Severity Score with a blunt trauma patient receiving an abdominal workup who did not have SBI (controls). Logistic regression models were unable to differentiate SBI with perforation from SBI without perforation. Thirteen percent of patients with documented perforating SBI had normal abdominal computed tomographic scans preoperatively. Alone or in combination, current diagnostic approaches lack sensitivity in the diagnosis of perforated SBI. Improvements in diagnostic methods and approaches are needed to ensure the prompt diagnosis of this uncommon but potentially devastating injury.
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            Does this adult patient have a blunt intra-abdominal injury?

            D L Simel, Daniel K. Nishijima, Alexandrea Holmes … (2012)
            Blunt abdominal trauma often presents a substantial diagnostic challenge. Well-informed clinical examination can identify patients who require further diagnostic evaluation for intra-abdominal injuries after blunt abdominal trauma. To systematically assess the precision and accuracy of symptoms, signs, laboratory tests, and bedside imaging studies to identify intra-abdominal injuries in patients with blunt abdominal trauma. We conducted a structured search of MEDLINE (1950-January 2012) and EMBASE (1980-January 2012) to identify English-language studies examining the identification of intra-abdominal injuries. A separate, structured search was conducted for studies evaluating bedside ultrasonography. We included studies of diagnostic accuracy for intra-abdominal injury that compared at least 1 finding with a reference standard of abdominal computed tomography, diagnostic peritoneal lavage, laparotomy, autopsy, and/or clinical course for intra-abdominal injury. Twelve studies on clinical findings and 22 studies on bedside ultrasonography met inclusion criteria for data extraction. Critical appraisal and data extraction were independently performed by 2 authors. The prevalence of intra-abdominal injury in adult emergency department patients with blunt abdominal trauma among all evidence level 1 and 2 studies was 13% (95% CI, 10%-17%), with 4.7% (95% CI, 2.5%-8.6%) requiring therapeutic surgery or angiographic embolization of injuries. The presence of a seat belt sign (likelihood ratio [LR] range, 5.6-9.9), rebound tenderness (LR, 6.5; 95% CI, 1.8-24), hypotension (LR, 5.2; 95% CI, 3.5-7.5), abdominal distention (LR, 3.8; 95% CI, 1.9-7.6), or guarding (LR, 3.7; 95% CI, 2.3-5.9) suggest an intra-abdominal injury. The absence of abdominal tenderness to palpation does not rule out an intra-abdominal injury (summary LR, 0.61; 95% CI, 0.46-0.80). The presence of intraperitoneal fluid or organ injury on bedside ultrasound assessment is more accurate than any history and physical examination findings (adjusted summary LR, 30; 95% CI, 20-46); conversely, a normal ultrasound result decreases the chance of injury detection (adjusted summary LR, 0.26; 95% CI, 0.19-0.34). Test results increasing the likelihood of intra-abdominal injury include a base deficit less than -6 mEq/L (LR, 18; 95% CI, 11-30), elevated liver transaminases (LR range, 2.5-5.2), hematuria (LR range, 3.7-4.1), anemia (LR range, 2.2-3.3), and abnormal chest radiograph (LR range, 2.5-3.8). Symptoms and signs may be most useful in combination, particularly in identification of patients who do not need further diagnostic workup. Bedside ultrasonography has the highest accuracy of all individual findings, but a normal result does not rule out an intra-abdominal injury. Combinations of clinical findings may be most useful to determine which patients do not require further evaluation, but the ideal combination of variables for identifying patients without intra-abdominal injury requires further study.
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              Radiation exposure at chest CT: a statement of the Fleischner Society.

              John R Mayo, Amy J. Aldrich, Jürgen Müller … (2003)
              The introduction of helical single-detector row computed tomography (CT) and, more recently, multi-detector row CT has greatly increased the clinical indications for CT. Correspondingly, CT examinations now account for greater than one-half of the radiation dose due to medical procedures in the population of North America. The level of CT radiation dose, especially in the pediatric population, is of concern to radiologists, medical physicists, government regulators, and the media. This review addresses this problem with particular reference to radiation dose in chest CT. Specifically it outlines the topics of measurement units used to quantify radiation exposure, factors affecting CT scanner dose efficiency, scanner settings that determine the administered radiation dose, and radiation dose reduction in chest CT. A table of reference dose values is provided. Given the wide variation documented in chest CT radiation exposure, the authors suggest that reference standards be promoted to minimize excessive CT radiation exposure. In addition, further research into the complex relationship between radiation exposure, image quality, and diagnostic accuracy should be encouraged in order to establish the minimum radiation dose necessary to provide adequate diagnostic information for standard clinical questions.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Res Med Sci
                Journal ID (iso-abbrev): J Res Med Sci
                Journal ID (publisher-id): JRMS
                Title: Journal of Research in Medical Sciences : The Official Journal of Isfahan University of Medical Sciences
                Publisher: Medknow Publications & Media Pvt Ltd (India )
                ISSN (Print): 1735-1995
                ISSN (Electronic): 1735-7136
                Publication date (Print): January 2014
                Volume: 19
                Issue: 1
                Pages: 23-27
                Affiliations
                [1]Department of Emergency Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
                [1 ]Department of Surgery, Isfahan University of Medical Sciences, Isfahan, Iran
                Author notes
                Address for correspondence: Dr. Mehrnoosh Shafiei, Department of Emergency Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. E-mail: m_shafiei2087@ 123456yahoo.com
                Article
                Publisher ID: JRMS-19-23
                PMC ID: 3963319
                SO-VID: 9c216de4-58ef-4d01-adab-7a40a081c74d
                Copyright © Copyright: © Journal of Research in Medical Sciences
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 29 May 2013
                Date revision received : 11 July 2013
                Date accepted : 07 August 2013
                Categories
                Subject: Original Article

                ScienceOpen disciplines: Medicine
                Keywords: blunt abdominal trauma,ct scan,ultrasound surface probe
                Data availability:
                ScienceOpen disciplines: Medicine
                Keywords: blunt abdominal trauma, ct scan, ultrasound surface probe

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