Critical Ultrasound Journal最新文献

{"title":"The impact of heart, lung and diaphragmatic ultrasound on prediction of failed extubation from mechanical ventilation in critically ill patients: a prospective observational pilot study.","authors":"Kavi Haji,&nbsp;Darsim Haji,&nbsp;David J Canty,&nbsp;Alistair G Royse,&nbsp;Cameron Green,&nbsp;Colin F Royse","doi":"10.1186/s13089-018-0096-1","DOIUrl":"https://doi.org/10.1186/s13089-018-0096-1","url":null,"abstract":"<p><strong>Background: </strong>Failed extubation from mechanical ventilation in critically ill patients is multifactorial, complex and not well understood. We aimed to identify whether combined transthoracic echocardiography, lung and diaphragmatic ultrasound can predict extubation failure in critically ill patients.</p><p><strong>Results: </strong>Fifty-three participants who were intubated > 48 h and deemed by the treating intensivist ready for extubation underwent a 60-min pre-extubation weaning trial (pressure support ≤ 10 cmH₂O and positive end expiratory pressure 5 cmH₂O). Prior to extubation, data collected included ultrasound assessment of left ventricular ejection fraction, left atrial area, early diastolic trans-mitral flow velocity wave (E), early diastolic trans-mitral flow velocity wave/late diastolic trans-mitral flow velocity wave (E/A), early diastolic trans-mitral flow velocity wave/early diastolic mitral annulus velocity (E/E'), interatrial septal motion, lung loss of aeration score and diaphragm movement. At the end of the weaning trial, the rapid shallow breathing index and serum B-type natriuretic peptide concentration were measured. Success and failure of weaning was assessed by defined criteria. Decision to extubate was at the discretion of the treating intensivist. Failure of extubation was defined as re-intubation, non-invasive ventilation or death within 48 h after extubation. Of 53 extubated participants, 11 failed extubation. Failed extubation was associated with diabetes, ischaemic heart disease, higher E/E' (OR 1.27, 95% CI 1.05-1.54), left atrial area (OR 1.14, CI 1.02-1.28), fixed rightward curvature of the interatrial septum (OR 12.95, CI 2.73-61.41), and higher loss of aeration score of anterior and lateral regions of the lungs (OR 1.41, CI 1.01-1.82).</p><p><strong>Conclusions: </strong>Failed extubation in mechanically ventilated patients is more prevalent if markers of left ventricular diastolic dysfunction and loss of lung aeration are present.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"13"},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0096-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36283079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Area method: a new method for ultrasound assessment of diaphragmatic movement.","authors":"Søren Helbo Skaarup,&nbsp;Anders Løkke,&nbsp;Christian B Laursen","doi":"10.1186/s13089-018-0092-5","DOIUrl":"https://doi.org/10.1186/s13089-018-0092-5","url":null,"abstract":"<p><strong>Background: </strong>Ultrasound can be used to assess diaphragm movement. Existing methods focus on movement at a single point at the hemidiaphragm and may not consider the anatomic and functional complexity. We aimed to develop an ultrasound method, the Area method, to assess movement of the entire hemidiaphragm dome and to compare it with existing methods to evaluate accuracy, inter-rater agreement, and feasibility.</p><p><strong>Methods: </strong>Movement of the diaphragm was evaluated by ultrasonography in 19 healthy subjects and correlated with simultaneously performed spirometry. Two existing methods, the M-mode excursion at the posterior part of diaphragm and the B-mode at the top of the diaphragm, were compared with the Area method. Two independent raters reviewed film clips to analyze inter-rater agreement. Feasibility was tested by novice ultrasound operators.</p><p><strong>Results: </strong>Correlation with expired lung volume was higher with the Area method, 0.88 (95% CI 0.81-0.95), p < 0.001, and with the M-mode measurement, 0.84 (95% CI 0.75-0.92), p < 0.001, than with the B-mode measurement, 0.71 (95% CI 0.59-0.83), p < 0.001. Inter-rater agreement was highest with the Area method, 0.9, p < 0.001, and M-mode measurement 0.9, p < 0.001, and lower with the B-mode measurement, 0.8, p < 0.001. The M-mode measurement could be done in only 20% at the left side. The Area method could be performed in all participants at both hemidiaphragms, and novice operators found it easy to perform.</p><p><strong>Conclusion: </strong>A new method to evaluate diaphragm movement is introduced. Accuracy and inter-rater agreement are high. The Area method is equally feasible at both hemidiaphragms in contrast to existing methods. However, additional studies should include more participants, different types of pulmonary diseases, and investigate the role of patient position to validate the Area method fully.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"15"},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0092-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36259367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lung and diaphragm ultrasound as predictors of success in weaning from mechanical ventilation.","authors":"Eva Tenza-Lozano,&nbsp;Ana Llamas-Alvarez,&nbsp;Enrique Jaimez-Navarro,&nbsp;Javier Fernández-Sánchez","doi":"10.1186/s13089-018-0094-3","DOIUrl":"https://doi.org/10.1186/s13089-018-0094-3","url":null,"abstract":"<p><strong>Background: </strong>Lung and diaphragm ultrasound methods have recently been introduced to predict the outcome of weaning from mechanical ventilation (MV). The aim of this study is to assess the reliability and accuracy of these techniques for predicting successful weaning in critically ill adults.</p><p><strong>Methods: </strong>We conducted two studies: a cross-sectional interobserver agreement study between two sonographers and a prospective cohort study to assess the accuracy of lung and diaphragm ultrasound for predicting weaning and extubation outcome. For the interobserver agreement study, we included 50 general critical care patients who were consecutively admitted to the ICU. For the predictive accuracy study, we included consecutively 69 patients on MV who were ready for weaning. We assessed interobserver agreement of ultrasound measurements, using the weighted kappa coefficient for LUSm score (modified lung ultrasound score) and the intraclass correlation coefficient (ICC) and Bland-Altman method for TI (diaphragm thickening index). We assessed the predictive value of LUSm and TI in weaning outcome by plotting the corresponding ROC curves.</p><p><strong>Results: </strong>We found adequate interobserver agreement for both LUSm (weighted kappa 0.95) and TI (ICC 0.78, difference according to Bland-Altman analysis ± 12.5%). LUSm showed good-moderate discriminative power for successful weaning and extubation (area under the ROC curve (AUC) for successful weaning 0.80, and sensitivity and specificity at optimal cut-off point 0.76 and 0.73, respectively; AUC for successful extubation 0.78, and optimal sensitivity and specificity 0.76 and 0.47, respectively. TI was more sensitive but less specific for predicting successful weaning (AUC 0.71, optimal sensitivity and specificity 0.93 and 0.48) and successful extubation (AUC 0.76, optimal sensitivity and specificity 0.93 and 0.58). The area under the ROC curve for predicting weaning success was 0.83 for both ultrasound measurements together.</p><p><strong>Conclusions: </strong>Interobserver agreement was excellent for LUSm and moderate-good for TI. A low TI value or high LUSm value indicates high risk of weaning failure.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"12"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0094-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36231069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Problems with interpretation of transient hyperemic response ratio (THRR).","authors":"Achyut Sharma,&nbsp;Diptesh Aryal","doi":"10.1186/s13089-018-0095-2","DOIUrl":"https://doi.org/10.1186/s13089-018-0095-2","url":null,"abstract":"","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"11"},"PeriodicalIF":0.0,"publicationDate":"2018-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0095-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36200097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility study of advanced focused cardiac measurements within the emergency department.","authors":"Joe Betcher,&nbsp;Al Majkrzak,&nbsp;Jim Cranford,&nbsp;Ross Kessler,&nbsp;Nik Theyyunni,&nbsp;Rob Huang","doi":"10.1186/s13089-018-0093-4","DOIUrl":"https://doi.org/10.1186/s13089-018-0093-4","url":null,"abstract":"<p><strong>Background: </strong>This study aims to compare the increased time needed to perform advanced focused cardiac measurements in the emergency department, including diastolic heart failure evaluation via E/E', and cardiac output with LVOT/VTI. Patients with pertinent cardiopulmonary symptoms in the emergency department had a focused cardiac ultrasound performed by the emergency department ultrasound team. The ability to obtain basic cardiac windows, evaluate for effusion, systolic ejection fraction, and right-sided heart pressures were recorded. Advanced measurements, along with time to obtain all images and the training level of the provider, were recorded.</p><p><strong>Results: </strong>Fifty-three patients were enrolled. Basic focused cardiac windows were able to be obtained in 80% of patients. The average 4-window focused cardiac ultrasound took 4 min and 49 s to perform. Diastolic measurements were able to be obtained in 51% of patients, taking an average of 3 min and 17 s. Cardiac output measurements were able to be obtained in 53% of patients, taking an average of 3 min and 8 s.</p><p><strong>Conclusion: </strong>The ability to obtain these images improved with increasing level of training. Performing both cardiac output and diastolic measurements increased the time with bedside ultrasound by 6 min and 25 s, and were able to be obtained in slightly over half of all ED patients.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"10"},"PeriodicalIF":0.0,"publicationDate":"2018-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0093-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36128204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prospective evaluation of cardiac ultrasound performance by general internal medicine physicians during a 6-month faculty development curriculum.","authors":"Christopher J Smith,&nbsp;Abdulrahman Morad,&nbsp;Christopher Balwanz,&nbsp;Elizabeth Lyden,&nbsp;Tabatha Matthias","doi":"10.1186/s13089-018-0090-7","DOIUrl":"https://doi.org/10.1186/s13089-018-0090-7","url":null,"abstract":"<p><strong>Background: </strong>Point-of-care (POCUS) education is rapidly expanding within medical schools and internal medicine residency programs, but lack of trained faculty is a major barrier. While POCUS training can improve short-term outcomes, knowledge and skills rapidly decay without deliberate practice and feedback. The purpose of this study was to evaluate the performance of focused cardiac ultrasound (FCU) by volunteer general internal medicine (GIM) faculty participating in a longitudinal POCUS curriculum.</p><p><strong>Methods: </strong>Participants: Nine GIM clinician-educators participated in a 6-month POCUS curriculum. Faculty performance was compared to three cardiology fellows. Three diagnostic cardiac sonographers (DCS) were also evaluated and served as the gold standard.</p><p><strong>Evaluation: </strong>the primary outcome was a FCU efficiency score, calculated by dividing image quality score by exam duration. FCU exams were conducted on three standardized patients after completion of an introductory workshop, at 3 months, and at 6 months. Two blinded cardiologists scored the exams.</p><p><strong>Analysis: </strong>mean efficiency scores were compared using a linear mixed effects model, followed by pairwise comparisons using Tukey's test.</p><p><strong>Results: </strong>GIM faculty's FCU efficiency scores were maintained over the 6-month period (2.2, SE 1.0 vs. 3.8, SE 1.0, p = 0.076). Their scores at each session were similar to cardiology fellows (p > 0.69), but inferior to DCSs (p < 0.0001).</p><p><strong>Conclusion: </strong>GIM faculty participating in a POCUS curriculum maintained their FCU performance over 6 months with efficiency scores comparable to experienced cardiology fellows.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"9"},"PeriodicalIF":0.0,"publicationDate":"2018-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0090-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36039826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Point-of-care lung ultrasound for diagnosis of Pneumocystis jirovecii pneumonia: notes from the field.","authors":"Maria Teresa Giordani,&nbsp;Francesca Tamarozzi,&nbsp;Daniel Kaminstein,&nbsp;Enrico Brunetti,&nbsp;Tom Heller","doi":"10.1186/s13089-018-0089-0","DOIUrl":"https://doi.org/10.1186/s13089-018-0089-0","url":null,"abstract":"<p><strong>Background: </strong>Thoracic ultrasound is helpful to evaluate lung pathology in patients with acute dyspnea. Several studies have demonstrated the efficacy of point-of-care ultrasound in patients with extrapulmonary TB and HIV co-infection. This retrospective, open-label case-control study explores the role of lung ultrasound in the diagnosis of Pneumocystis jirovecii pneumonia (PJP) in HIV-positive patients. In particular, it highlights the potential role of specific sonographic features that may be unique to this population.</p><p><strong>Methods: </strong>The record of all HIV-positive patients admitted from 1.1.2013 to 31.6.2017 to the Department of Infectious Diseases and Tropical Medicine of san Bortolo Hospital, Vicenza, Italy, with a discharge diagnosis of acute lung injury (ALI) and who received point-of-care ultrasound of the chest for clinical purposes was included in the analysis. The patients were scanned according with the evidence-based recommendation.</p><p><strong>Results: </strong>Of 273 HIV-positive patients whose records were reviewed, 81 (29.6%) were diagnosed with ALI. Complete documentation was available for 24 patients, of which 14 (58.3%) had microbiologically confirmed PJP (PJP+) and 10 (41.7%) had other conditions (PJP-). B-lines, subpleural consolidations, and cystic changes were significantly more frequent in patients with PJP (14/14 vs. 6/10, p = 0.0198; 14/14 vs. 4/10, p = 0.0016; 8/14 vs. 0/10, p = 0.0019, respectively). In particular, B-lines and subpleural consolidations were present in all PJP+ patients in our cohort giving a sensitivity of 100%, but their specificity was low (45 and 60%, respectively). On the contrary, the presence of consolidations with cystic changes had a very high specificity for PJP (100%), but low sensitivity (57%). Pleural effusions and consolidations with linear air bronchograms were not observed in PJP+ patients.</p><p><strong>Conclusions: </strong>B-lines, subpleural consolidations, and cystic changes are suggestive of PJP. Lung consolidation with air bronchograms and pleural effusion should prompt suspicion of other etiologies. These findings have the potential to be useful in the daily management of HIV-positive patients in resource-limited settings where other diagnostic tools are rarely available.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"8"},"PeriodicalIF":0.0,"publicationDate":"2018-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0089-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36020217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"eFAST for the diagnosis of a perioperative complication during percutaneous nephrolithotomy.","authors":"Achyut Sharma,&nbsp;Prajjwal Bhattarai,&nbsp;Apurb Sharma","doi":"10.1186/s13089-018-0088-1","DOIUrl":"https://doi.org/10.1186/s13089-018-0088-1","url":null,"abstract":"<p><p>A 29-year-old patient with normal preanesthetic evaluation was planned for percutaneous nephrolithotomy (PCNL) for right nephrolithiasis with right pyelolithiasis. Surgery was performed under general anesthesia with endotracheal intubation with muscle relaxation. At the conclusion of surgery, when the patient was turned over to supine position, tense abdomen was noted. Immediately extended focused assessment with sonography in trauma (eFAST) was done in which both right and left quadrants of abdomen including pericardial and suprapubic region, right and left thoracic, and both lung basis were examined. Fluid collection was seen in Morison's pouch which was drained by the urologist under real-time ultrasonography guidance by anesthesiologist. Distension of abdomen subsequently subsided and patient had normal vitals. Trachea was extubated and patient shifted to post-operative ward. eFAST and FAST scans are routine procedures in the rapid assessment of trauma victims in emergency settings. The fluid extravasation during a routine PCNL procedure may lead to abdominal compartment syndrome. This case demonstrated that use of eFAST rapidly detected abdominal collection and ruled out life-threatening conditions such as hemothorax and pneumothorax and prevented abdominal compartment syndrome. Our case is only an example that potentially lethal conditions like these may be encountered in the perioperative setting and the knowledge of eFAST scan may be of great help.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"7"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0088-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35976284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasound assessment of visual loss during severe preeclampsia: a case report.","authors":"Fehmi Ferhi,&nbsp;Abdeljalil Khlifi,&nbsp;Feten Hachani,&nbsp;Khalil Tarmiz,&nbsp;Khaled Benjazia","doi":"10.1186/s13089-018-0087-2","DOIUrl":"https://doi.org/10.1186/s13089-018-0087-2","url":null,"abstract":"<p><p>Bilateral retinal detachments and cortical blindness are rare complications of preeclampsia and the association of the two pathologies is exceptional. We report the case of a preeclamptic patient who presented with an acute bilateral vision loss. Besides, her ocular ultrasound revealed bilateral retinal detachments and an elevated optic nerve sheath diameter. The patient underwent an urgent cesarean section. Subsequently, magnetic resonance imaging and ocular fundus examination confirmed the diagnosis.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"6"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0087-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35824030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute fissuration of a giant splenic artery aneurysm detected by point-of-care ultrasound: case report.","authors":"Philippe Le Conte,&nbsp;David Trewick,&nbsp;Philippe Pes,&nbsp;Eric Frampas,&nbsp;Eric Batard","doi":"10.1186/s13089-018-0086-3","DOIUrl":"https://doi.org/10.1186/s13089-018-0086-3","url":null,"abstract":"<p><strong>Background: </strong>Epigastric pain is frequent in Emergency Medicine and remains a challenging situation. Besides benign etiologies such as gastritis or uncomplicated cholelithiasis, it could reveal myocardial infarction or vascular disease. Point-of-care ultrasound (POCUS) could be performed in such situation.</p><p><strong>Case presentation: </strong>A healthy 66-year-old man with no previous medical history was admitted to the Emergency Department for a rapid onset epigastric pain. He reported taking non-steroidal anti-inflammatories for 1 week prior to admission. His pain had rapidly subsided and the physical examination was inconclusive. ECG and blood samples were normal. POCUS revealed a vascular mass located between the spleen and the left kidney measuring 80 * 74 mm associated with small amounts of free peritoneal fluid. Computed tomography diagnosed a fissurated giant aneurysm of the splenic artery. The aneurysm was managed emergently by endovascular exclusion by selective splenic artery embolization. The post-intervention course was uneventful and the patient was discharged home 3 days later. The patient has remained free from any complications of the embolization 6 months after the procedure.</p><p><strong>Conclusion: </strong>Spontaneously regressive epigastric pain with a normal physical and biology/ECG should not necessarily reassure the physician, in particular if patients have cardiovascular risk factors. A POCUS should be considered for these patients.</p>","PeriodicalId":46598,"journal":{"name":"Critical Ultrasound Journal","volume":"10 1","pages":"5"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13089-018-0086-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35786273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}