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Erschienen in: Pediatric Radiology 8/2021

Open Access 10.04.2021 | Original Article

Non-radiologist-performed abdominal point-of-care ultrasonography in paediatrics — a scoping review

verfasst von: Elsa A. van Wassenaer, Joost G. Daams, Marc A. Benninga, Karen Rosendahl, Bart G. P. Koot, Samuel Stafrace, Owen J. Arthurs, Rick R. van Rijn

Erschienen in: Pediatric Radiology | Ausgabe 8/2021

Abstract

Background

Historically, US in the paediatric setting has mostly been the domain of radiologists. However, in the last decade, there has been an uptake of non-radiologist point-of-care US.

Objective

To gain an overview of abdominal non-radiologist point-of-care US in paediatrics.

Materials and methods

We conducted a scoping review regarding the uses of abdominal non-radiologist point-of-care US, quality of examinations and training, patient perspective, financial costs and legal consequences following the use of non-radiologist point-of-care US. We conducted an advanced search of the following databases: Medline, Embase and Web of Science Conference Proceedings. We included published original research studies describing abdominal non-radiologist point-of-care US in children. We limited studies to English-language articles from Western countries.

Results

We found a total of 5,092 publications and selected 106 publications for inclusion: 39 studies and 51 case reports or case series on the state-of-art of abdominal non-radiologist point-of-care US, 14 on training of non-radiologists, and 1 each on possible harms following non-radiologist point-of-care US and patient satisfaction. According to included studies, non-radiologist point-of-care US is increasingly used, but no standardised training guidelines exist. We found no studies regarding the financial consequences of non-radiologist point-of-care US.

Conclusion

This scoping review supports the further development of non-radiologist point-of-care US and underlines the need for consensus on who can do which examination after which level of training among US performers. More research is needed on training non-radiologists and on the costs-to-benefits of non-radiologist point-of-care US.
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Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1007/​s00247-021-04997-x.

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Introduction

In paediatric medicine, US is a widely used imaging technique because it is noninvasive, safe and fast. Traditionally, US examinations are performed by radiologists and ultrasonographers. However, with the introduction of affordable and portable US systems, US is increasingly used as a bedside tool, or the so-called point-of-care, by non-radiologists.
To ensure good medical care for children, a high-quality US examination is of great importance, regardless of the type of physician performing the examination. This quality can be achieved by setting national and international quality standards, and by achieving consensus among US performers on who can do which examination after which level of training. At this point, there is a lack of consensus. This can partly be explained by radiologists, including paediatric radiologists, expressing their fear of losing territory. As the European Society of Radiology (ESR) position paper on US stated, “Turf battles about the use of US continue to grow as more and more specialists are claiming US as part of their everyday’s [sic] work, and the position of radiologists is progressively further undermined” [1]. As a result, non-radiologist point-of-care US has primarily developed outside the sight of radiologists, and consequently many radiologists are not aware of the status of such testing.
If radiologists and non-radiologists would be more aware of both the current uses of non-radiologist point-of-care US and the current gaps in literature, this might form a strong scientific basis for a proper consultation between the two. In a first step to address this issue, we conducted a scoping review focusing on abdominal point-of-care US performed by non-radiologists in children. The aim of this review was to gain an overview of uses of abdominal non-radiologist point-of-care US in children. Additionally, we aimed to identify gaps in the evidence, which can form the basis for future research projects to create a firm scientific base for the implementation of non-radiologist point-of-care US in paediatric medicine.

Materials and methods

The method for this scoping review was based on the framework outlined by Arksey and O’Malley [2]. The review included the following five key elements: (1) identifying the research question; (2) identifying relevant studies; (3) selecting studies; (4) charting the data; and (5) collating, summarising and reporting the results. The research topics we focussed on were:
  • providing an overview of the uses of abdominal non-radiologist point-of-care US, sorted by organ;
  • assessing the quality of examinations and training for abdominal non-radiologist point-of-care US;
  • assessing the patient perspective of abdominal non-radiologist point-of-care US;
  • financial costs of abdominal non-radiologist point-of-care US; and
  • legal consequences following the use of abdominal non-radiologist point-of-care US.
The search was conducted with the help of a clinical librarian (J.G.D.) on April 25, 2019, in the Medline, Embase and Web of Science Conference Proceedings databases. The search terms are shown in Online Supplementary Material 1. The inclusion criteria were original research studies on abdominal non-radiologist point-of-care US in children. We excluded studies not written in English, not published, not from Western countries (i.e. North America, Australia or Europe), studies in which both adults and children were studied but in which the data could not be separated, and studies of which no full text was available. In case the US operator was not specified and no radiologist was involved in the study, we assumed the US operator was a non-radiologist. In all other cases, the study was excluded. The full details of the study selection and data extraction can be found in the previously published review protocol [3]. We focussed only on abdominal non-radiologist point-of-care US because given the broadness of the field of non-radiologist point-of-care US, it was not feasible to perform a scoping review of the whole field (e.g., chest or musculoskeletal US).

Results

The total number of records found from the initial database searches was 7,624. After eliminating 2,532 duplications and subsequently excluding 4,676 records that did not comply with our inclusion criteria based on title and abstract, the number of potentially relevant records was further reduced to 416. Finally, after full-text screening, we included 106 articles: 39 studies and 51 case reports or case series that together gave an overview of the uses of abdominal non-radiologist point-of-care US, 14 on training of non-radiologists, and 1 each on legal consequences following non-radiologist point-of-care US and on patient satisfaction (Fig. 1). No studies on the financial costs of non-radiologist point-of-care US were identified.
The 106 articles included in this scoping review were published between 1990 and 2019, with 50 (47%) articles published within the last 5 years (Fig. 2). Most of the studies were conducted in the United States (83%). Only four articles were published in journals with a focus on imaging, two of which were in a journal dedicated to point-of-care US in any environment or setting [47]. In 11 articles (10%), a radiologist was named as a co-author.

Overview of uses of non-radiologist point-of-care ultrasound

Of the 39 studies on abdominal non-radiologist point-of-care US, we found 9 studies on the bladder (Table 1; [816]), 10 on the bowel (Table 2; [1726]), 4 on the stomach (Table 3; [2730]), 1 on the kidney (Table 4; [31]), 4 on fluid status (Table 5; [4, 3234]), 9 on non-radiologist point-of-care US for trauma screening (Table 6; [3543]) and 1 “other” on umbilical artery line placement (Table 7; [44]). Next we present these studies per organ. The case reports and series are displayed in Table 8 [5, 4594].
Table 1
Characteristics of included studies on non-radiologist US of the bladder
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performera
Massagli [8]
1990
USA
Paediatrics
20
0–16
Obs
Bladder volume
Chen [9]
2005
USA
Emergency
136
0–2
Obs
Bladder volume
Paediatric EDP
Witt [10]
2005
USA
Emergency
65
0–1
RCT
Bladder volume
Baumann [11]
2008
USA
Emergency
45
0–1
RCT
Bladder volume
Nurse
Dessie [12]
2018
USA
Emergency
120
14
RCT
Bladder volume
Paediatric EDP
Weill [13]
2019
Canada
Emergency
201
0
RCT
Bladder volume
Paediatric EDP
Enright [14]
2010
UK
Emergency
45
1–4
Obs
Dehydration
Buntsma [15]
2012
Australia
Emergency
60
0–1
Obs
Suprapubic aspiration
EDP
Gochman [16]
1991
USA
Emergency
66
0–1
RCT
Suprapubic aspiration
EDP
EDP emergency department physician, Obs observational, RCT randomised controlled trial
– indicates not reported, and no radiologist as co-author
Table 2
Characteristics of included studies on non-radiologist US of the bowel
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performer
Fox [17]
2008
USA
Emergency
48
7–18
Obs
Appendicitis
EDP
Elikashvili [18]
2014
USA
Emergency
150
12
(SD 5.2)
Obs
Appendicitis
Paediatric EDP
Doniger [19]
2018
USA
Emergency
40
2–18
Obs
Appendicitis
EDP
Nicole [20]
2018
Canada
Emergency
121
8–14
Obs
Appendicitis
EDP
Soundappan [21]
2018
Australia
Surgery
65
3–15
Obs
Appendicitis
Paediatric surgeon
Jimbo [22]
2016
Japan
Surgery
84
4–15
Retro
Appendicitis
Paediatrician
Riera [23]
2012
USA
Emergency
82
0–10
Obs
Intussusception
EDP
Lam [24]
2014
USA
Emergency
44
2
Retro
Intussusception
EDP
Gurien [25]
2017
USA
NICU
17
0
Obs
Motility
Surgeon
Doniger [26]
2018
USA
Emergency
50
4–17
Obs
Constipation
Clinicians
EDP emergency department physician, NICU neonatal intensive care unit, Obs observational, Retro retrospective, SD standard deviation
Table 3
Characteristics of included studies on non-radiologist US of the stomach
Author
Year
Country
Department
n
Age (years)a
Design
Indication
Ultrasound performer
Schmitz [27]
2016
Switzerland
Anaesthesiology
18
6–12
Obs
Empty stomach
Anaesthesiologist
Moser [28]
2017
Canada
Anaesthesiology
100
8–16
Obs
Empty stomach
Anaesthesiologist
Sivitz [29]
2013
USA
Emergency
67
0 (IQR 14–83 days)
Obs
Pyloric hypertrophy
Paediatric EDP
Wyrick [30]
2014
USA
Surgery
17
Obs
Pyloric hypertrophy
Surgeon, paediatric EDP
EDP emergency department physician, IQR interquartile range, Obs observational
– indicates not reported, and no radiologist as co–author
Table 4
Characteristics of included studies on non-radiologist US of the kidney
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performer
Guedj [31]
2015
France
Emergency
433
0 (IQR 0–1)
Obs
Hydronephrosis
EDP
EDP emergency department physician, IQR interquartile range, Obs observational
Table 5
Characteristics of included studies on non-radiologist US of fluid status
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performer
Chen [32]
2007
USA
Emergency
72
0–16
Obs
Dehydration
Paediatric EDP
Chen [33]
2010
USA
Emergency
112
5 (SD 4)
Obs
Dehydration
Paediatric EDP
Jauregui [4]
2014
USA
Emergency
113
0–18
Obs
Dehydration
EDP
Wyrick [34]
2015
USA
Surgery
31
0–0
Obs
Dehydration
Surgeon
EDP emergency department physician, Obs observational, SD standard deviation
Table 6
Characteristics of included studies on non-radiologist US after trauma
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performera
Ingeman [35]
1996
USA
Emergency
31
2–18
Obs
Free fluid
EDP
Thourani [36]
1998
USA
Emergency
192
0–14
Obs
Free fluid
Surgeon
Partrick [37]
1998
USA
Surgery
230
0–17
Obs
Free fluid
Surgeon
Corbett [38]
2000
USA
Emergency
47
9
Obs
Free fluid
EDP
Scaife [39]
2013
USA
Emergency
88
2–12
Obs
Free fluid
Surgeon
Menaker [40]
2014
USA
Emergency
887
6–16
Obs
Free fluid
EDP
McGaha [41]
2019
USA
Emergency
292
11+−5
Retro
Free fluid
Holmes [42]
2017
USA
Emergency
925
9.7±5.3
RCT
Free fluid
EDP
Brenkert [43]
2017
USA
Emergency
103
6–14
Retro
Free fluid
EDP
EDP emergency department physician, Obs observational, Retro retrospective, RCT randomised controlled trial
– indicates not reported, and no radiologist as co-author

Bladder

Of the nine studies on non-radiologist point-of-care US of the bladder, six assessed bladder volume, two during suprapubic aspiration; one assessed the degree of dehydration (Table 1). Of the studies regarding bladder volume, we identified four randomised controlled trials and two observational studies, mostly aiming to assess the benefit of using non-radiologist point-of-care US to obtain a valid urine sample for urinalysis. Three studies used success rates of catheterisation in infants as the end point and all found an increased success rate when using non-radiologist point-of-care US prior to catheterization [911]. One study used success rate of obtaining a clean-catch urine sample and did not find a difference between the two groups [13], and one study found that performing an non-radiologist point-of-care US prior to sending a child to the radiology department for a transabdominal pelvic US predicted the patient readiness for the examination and decreased time to pelvic US. The two studies regarding suprapubic aspiration both assessed whether the success rate could be improved. One study was a randomised controlled trial comparing blind suprapubic aspiration to non-radiologist point-of-care US-guided suprapubic aspiration and found a higher success rate in the US-guided group (79% vs. 52%, P=0.04) [16]. The other study demonstrated a success rate of only 53% when using non-radiologist point-of-care US for bladder scan [15]. Last, the results of the last study suggest that non-radiologist point-of-care US for bladder scan could be used to monitor urine production in children suspected of having dehydration [14].

Bowel

We identified six studies on non-radiologist point-of-care US for diagnosing appendicitis, two on intussusception, one on constipation and one on bowel motility (Table 2). Six studies assessed the diagnostic accuracy of non-radiologist point-of-care US in diagnosing appendicitis in children, all with a combination of pathology and clinical follow-up details as reference standard [1721, 26]. For detailed analysis of diagnostic accuracy, we refer to a previously published systematic review on this topic [95]. In two of the included studies, performance of non-radiologists was compared to that of radiologists. One of these two studies demonstrated a comparable accuracy between the two raters and a sensitivity of 82% (95% confidence interval [CI]: 64–92) vs. 96% (95% CI: 83–99) and specificity of 97% (95% CI: 85–99) vs. 100% (95% CI: 87–100), respectively [21]. In contrast, the other study demonstrated that non-radiologists reported inconclusive results more often than radiologists (59% compared to 15%, respectively) [20]. Last, one study showed that the use of non-radiologist point-of-care US could decrease the length of hospital stay for children suspected of having appendicitis (length of stay decreased from 288 min (95% CI: 256–319) to 154 min (95% CI: 113–195) [18].
The two studies regarding intussusception assessed the diagnostic accuracy of non-radiologist point-of-care US, using radiology department examinations as a reference standard (either radiology US [23] or any (i.e. CT, US, barium enema) [24]. Sensitivity of non-radiologist point-of-care US ranged from 85% to 100% and specificity from 97% to 100%.
Finally, one pilot study showed that non-radiologist point-of-care US can be used to detect return of bowel function in infants with gastroschisis by assessing presence of motility [25], and one study assessed whether measuring the transrectal diameter can be used to diagnose constipation in children with abdominal pain. The latter study showed a sensitivity of 86% (95% CI: 69–96), and a specificity of 71% (95% CI: 53–85) using the Rome III criteria as a reference standard [26].

Stomach

We identified two studies on preoperative gastric content assessment and two on pyloric hypertrophy diagnosis (Table 3). The two studies on non-radiologist point-of-care US regarding the assessment of stomach filling status were from the anaesthesiology department and assessed whether non-radiologist point-of-care US could be used to assess whether a patient can be intubated safely. One of these studies used MRI findings as a reference standard [27] and the other used gastroscopy [28]. Both studies demonstrated that gastric content could be assessed with acceptable accuracy (area under the curve for measurements in the right lateral decubital position ranged from 0.73 to 0.92).
The other two studies demonstrated that non-radiologist point-of-care US is capable of accurately diagnosing pyloric hypertrophy when using radiology US as reference standard (sensitivity when identifying pylorus: 100% [95% CI: 66–100]; specificity, 100% [95% CI: 92–100]) [29]. There was no difference between measurements obtained by the non-radiologists compared to the radiologists (P>0.2) [29, 30].

Kidney

The one study on kidneys assessed the diagnostic accuracy of non-radiologist point-of-care US in diagnosing hydronephrosis. It found a sensitivity of 77% (95% CI: 58–95%) and a specificity of 97% (95% CI: 95–99%), using radiology US as reference standard (Table 4) [31].

Fluid status

We identified four studies that assessed the use of non-radiologist point-of-care US in determining fluid status (Table 5). All used the inferior vena cava/aorta ratio and compared this ratio to dehydration. Dehydration was assessed by weight loss, clinical judgement of dehydration, or bicarbonate level. Reported sensitivity ranged from 39% to 86% and reported specificity ranged from 56% to 100% [4, 3234].

Trauma screening

We identified nine studies on non-radiologist point-of-care US after trauma (i.e. non-radiologist focused abdominal sonography for trauma [FAST]) (Table 6). Four of these studies assessed the diagnostic utility of non-radiologist point-of-care US after trauma using CT, findings during laparoscopy, or clinical outcome as a reference standard. The reported sensitivity ranged 50–100% (95% CI: 36–100) and the specificity ranged 96–100% (95% CI: 80–100) [35, 36, 38, 39]. Five of the identified studies assessed the clinical impact of non-radiologist point-of-care US on management after trauma, either by assessing the impact on number of needed CT scans [37, 39, 40, 42] or by assessing the success rate of nonoperative management (i.e. not needing an intervention) based on the non-radiologist point-of-care US result [41]. Most of these studies demonstrated that, overall, the use of CT decreased when non-radiologist FAST was increasingly used [37, 39, 40]. However, in hemodynamically stable patients, the clinical care (e.g., length of hospital stay and CT usage) did not improve by using non-radiologist FAST [42]. In addition, one study reported that in 5/88 (6%) patients, the non-radiologist FAST exam was negative, whereas the patients had a significant injury (e.g., required blood transfusion) and that in one of these cases the surgeon would have cancelled the CT based on the non-radiologist FAST exam [39].

Other

We identified one study on a procedural non-radiologist point-of-care US, regarding umbilical artery catheter placement. This study showed that non-radiologist point-of-care US can reduce the time of line placement from 139 min (standard deviation [SD]: 49 min) to 75 min (SD: 25 min) (P<0.001) [44] (Table 7).
Table 7
Characteristics of included studies on other non-radiologist US for “other” category
Author
Year
Country
Department
n
Age (years)
Design
Indication
Ultrasound performer
Fleming [44]
2011
USA
NICU
31
0
RCT
Line placement in umbilical artery
Neonatologist and fellows
NICU neonatal intensive care unit, RCT randomised controlled trial

Case reports and case series

We identified 49 case reports and case series on abdominal non-radiologist point-of-care US in children (Table 8). According to these publications, a total of 31 different diagnoses were made with the help of non-radiologist point-of-care US. In all but three publications, the diagnosis was made at the emergency department.
Table 8
Case reports and series on abdominal non-radiologist US in paediatrics
Author
Year
Country
Department
n
Age (years)
Organ
Diagnosis
Ultrasound performera
Hinds [45]
2015
USA
Emergency
1
4
Abdomen
Lymphangioma
EDP
Dingman [46]
2007
USA
Emergency
1
4
Aorta
Aortic coarctation
Emergency medicine resident
Baumann [47]
2008
USA
Emergency
1
0
Bladder
Bladder volume
Nurse
Elsamra [48]
2011
USA
Urology
2
14–17
Bladder
Ovarian cyst
Ng [49]
2015
USA
Emergency
1
3
Bladder
Urolithiasis
EDP
Chandra [50]
2015
USA
Emergency
8
5–17
Bladder
Urolithiasis
Paediatric EDP
Stone [51]
2010
USA
Emergency
1
6
Bowel
Appendicitis
EDP
Halm [52]
2010
USA
Emergency
1
15
Bowel
Appendicitis
Paediatric EDP
Lavine [53]
2014
USA
Emergency
1
8
Bowel
Appendicitis
EDP
Ravichandran [54]
2016
USA
Emergency
1
3
Bowel
Appendicitis
EDP
Pade [55]
2018
USA
Emergency
1
5
Bowel
Appendicitis
Paediatric emergency medicine fellow
Horowitz [56]
2016
USA
Emergency
3
2–4
Bowel
Foreign body
EDP
Leibovich [57]
2015
USA
Emergency
2
2–13
Bowel
Foreign body
Ramgopal [58]
2017
USA
Emergency
1
0
Bowel
Free fluid
Paediatric EDP
Alfonzo [59]
2017
USA
Emergency
1
0
Bowel
Hernia
Kairam [60]
2009
USA
Emergency
1
0
Bowel
Intussusception
EDP
Alletag [61]
2011
USA
Emergency
1
0
Bowel
Intussusception
Paediatric emergency medicine fellow
Halm [62]
2013
UK
Emergency
1
2
Bowel
Intussusception
EDP
Ramsey [63]
2014
USA
Emergency
1
4
Bowel
Intussusception
Paediatric emergency medicine fellow
Nelson [5]
2014
USA
Emergency
1
6
Bowel
Intussusception
EDP
Doniger [64]
2016
USA
Emergency
2
0–2
Bowel
Intussusception
Paediatric EDP
Sharma [65]
2019
Canada
Emergency
2
0
Bowel
Intussusception
Paediatric emergency medicine fellow
Garcia [66]
2019
USA
Emergency
5
0–9
Bowel
Malrotation/volvulus
Paediatric EDP
Kornblith [67]
2016
USA
Emergency
2
3–15
Bowel
Meckel diverticulitis
EDP
Brazg [68]
2016
USA
Emergency
1
5
Bowel
Omental torsion
EDP
James [69]
2016
Canada
Emergency
5
5–14
Bowel
Small-bowel obstruction
EDP
Sivitz [70]
2013
USA
Emergency
1
0
Bowel
Volvulus
Paediatric EDP
Tsung [71]
2010
USA
Emergency
13
1–15
Gallbladder
Cholecystitis
Shihabuddin [72]
2013
USA
Emergency
1
10
Gallbladder
Cholecystitis
Paediatric EDP
Damman [73]
2016
USA
Emergency
1
0
Gallbladder
Cholelithiasis
Gilmore [74]
2004
USA
Emergency
1
0
Kidney
Hydronephrosis
EDP
Hall [75]
2011
UK
Emergency
1
13
Kidney
Hydronephrosis
EDP
Schecter [76]
2012
USA
Emergency
1
7
Kidney
Hydronephrosis
Dunlop [77]
2014
USA
Emergency
1
9
Kidney
Renal carcinoma
Garcia [78]
2019
USA
Emergency
1
7
Kidney
Stent displacement
Paediatric EDP
Ginger [79]
2009
USA
Urology
8
0–17
Kidney
Stent placement
Urologists
Jamjoom [80]
2015
Canada
Emergency
4
0–11
Liver
Neuroblastoma
EDP
Pe [81]
2016
USA
Emergency
1
13
Ovary
cystic adenoma
EDP
Johnson [82]
2006
USA
Emergency
1
15
Ovary
Ovarian torsion
EDP
Pershad [83]
2002
USA
Emergency
1
10
Spleen
Splenic rupture
EDP
Parekh [84]
2018
USA
Anaesthesiology
3
0–3
Stomach
Empty stomach
Anaesthesiologist
Myatt [85]
2018
USA
Emergency
3
2–12
Stomach
Gastric tube placement
EDP
Malcolm [86]
2009
USA
Emergency
8
0
Stomach
Pylorus hypertrophy
EDP
Pershad [87]
2000
USA
Emergency
1
16
Trauma
Free fluid
EDP
Gallagher [88]
2012
USA
Emergency
1
3
Trauma
Free fluid
EDP
Root [89]
2018
USA
Emergency
1
17
Trauma
Free fluid
Paediatric EDP
Godambe [90]
2007
USA
Emergency
1
8
Trauma
Hydronephrosis
EDP
Neville [91]
2017
USA
Emergency
1
16
Trauma
Splenic rupture and liver laceration
Paediatric emergency medicine fellow
Fischer [92]
2014
Canada
Emergency
1
12
Uterus
Haematocolpometra
Paediatric EDP
Gross [93]
2017
USA
Emergency
1
11
Vagina
Foreign body
EDP
Lahham [94]
2016
USA
Emergency
1
16
Vena cava
Thrombus
EDP
EDP emergency department physician
– indicates not reported, and no radiologist as co-author

Quality and training

We identified 16 published articles concerning the training of non-radiologists performing non-radiologist point-of-care US in children (Table 9; [6, 7, 23, 30, 31, 38, 39, 96104]). We subdivided these publications into three categories: (1) studies reporting efforts and outcomes of general training strategies for non-radiologist point-of-care US, (2) studies reporting training strategies for a dedicated application of non-radiologist point-of-care US and (3) surveys that reported the state of non-radiologist point-of-care US use and training in paediatric medicine. We describe these findings in the following subsections.
Table 9
Training strategies (n=14)
Author
Year
Country
Department
Design
Training method
Cohen [96]
2012
USA
Emergency
Survey
76% received bedside/informal teaching, 23% received training by lectures and 16% by workshops or full-day course
Conlon [97]
2015
USA
PICU
Prospective training study (general training)
- 2-day introductory course: didactic and hands-on training sessions with max 5 students per trainer; 4 consensus-derived training modules (procedural, hemodynamic, thoracic and abdominal)
- Demonstration of skills after >25 acceptable studies per module
- Reviewing of POCUS images twice a week by non-radiologist POCUS experts and once a month by radiology department
Corbett [38]
2000
USA
Emergency
Prospective training study (post trauma)
1-day training course: didactic lectures, a videotaped session with instruction on trauma US, videotape with real-time images of pathology, hands-on workshop on healthy volunteers and finally a test using images
Gold [98]
2017
USA
Emergency
Survey
Didactics (70%), simulations in skills lab (52%), structured rotations by trained faculty (39%) or no US education (12%)
Guedj [31]
2015
France
Emergency
Prospective training study (single-organ POCUS)
- 1–2-h didactic session (basics, physics, UTI sonography)
- Hands-on training: 5 procedures
Hoeffe [99]
2016
Canada
Emergency
Survey
Radiology rotation (28%), official course (45%), no training (28%)
Kornblith [100]
2015
USA
Emergency
Survey
Not specified
Kwan [101]
2019
Canada
Emergency
Prospective training study (general training)
Via an online POCUS image interpretation learning and assessment system with 100 cases per application (e.g., FAST, lung, cardiac) with acceptable quality and showing a spectrum of pathology and normal anatomy. Included short clinical presentation, a video and image. Trainees could respond if case was normal/abnormal, and in case of abnormal the area of abnormality was to be selected, and they received feedback
Marin [6]
2012
USA
Emergency
Survey
Bedside (40%), general emergency management physician training (40%), formal course (25%), outside CME course (10%), radiology training (8%)
Nguyen [102]
2016
USA
NICU/PICU
Survey
Bedside (63%), lectures (54%), workshops (47/65%), self-study (47/43%), radiology rotation (26/5%) (NPM/PCCM, respectively)
Ramirez–Schremp [103]
2008
USA
Emergency
Survey
US rotation (33%), hands-on experience (33%), conferences (41%)
Reaume [7]
2019
USA
Emergency
Survey
Procedure-only training (34%), rotations in other departments (22%), no US training (12%)
Riera [23]
2012
USA
Emergency
Prospective training study (single-organ POCUS)
- All trainees had >1 month of clinical instruction in performing a variety of POCUS procedures in emergency department (100–150 procedures on adults). No previous experience with bowel US
- 1 h focused training session: didactic component and hands-on scanning with child as a model
Scaife [39]
2013
USA
Emergency
Prospective training study (FAST)
- Technical instruction, viewing an instructional video, didactic session including hands-on training
- At least 30 exams, of which 5 were proctored by certified paediatric sonographer or certified adult emergency medicine physician and of which at least 5 were positive for abdominal free fluid
- Final competence exam (patients with ascites or ventriculoperitoneal shunt). Topics for exam: detection of intra-abdominal fluid, orientation and accuracy of probe placement, adequate scanning through fields, acceptable efficiency/time frame and ability to obtain key structures
Shefrin [104]
2019
USA
Emergency
Delphi procedure
Not applicable
Wyrick [30]
2014
USA
Surgery
Prospective training study (single-organ POCUS)
Five hands-on exams
CME continuing medical education, FAST focused abdominal sonography for trauma, NICU neonatal intensive care unit, NPM neonatal perinatal medicine, PCCM pediatric critical care medicine, PICU paediatric intensive care unit, POCUS point-of-care ultrasound, UTI urinary tract infection
Studies reporting efforts and outcomes of general training strategies for non-radiologist point-of-care ultrasound
The first is a study from a paediatric critical care department that reported initial efforts, structure, and progress within the division and institution to train and credential physicians [97]. Physicians were trained as follows: they first participated in a 2-day introductory course with didactic lectures and hands-on training sessions. The training consisted of four modules: procedural, haemodynamic, thoracic and abdominal. After the training they were encouraged to perform at least 25 point-of-care US exams per module. Images were saved and were reviewed by point-of-care US experts once a week and by a radiologist once a month. Although only one of the 25 trainees completed the whole course, the non-radiologist point-of-care US examinations they performed contributed to the clinical management (i.e. after performing the US the clinical management was changed) and the authors reported a good experience with the reviewing process.
Another study designed an online learning platform to train paediatric emergency medicine physicians and reported the performance of the trainees [101]. The learning platform consisted of 100 cases (including short clinical presentation, video, images) per application (e.g., FAST, lung, cardiac) and trainees had to distinguish pathology from normal anatomy. In case of pathology they had to identify the location. After every case they received feedback. On average participants needed to complete 1–45 cases to reach 80% accuracy and 11–290 cases to reach 95% accuracy. The least efficient participants (95th percentile) needed to complete 60–288 cases to reach 80% accuracy and 243–1,040 to reach 95% accuracy. Most participants needed about 2–3 h to achieve the highest performance benchmark.
The last study in this category was a publication describing the efforts of a number of experts in the field of paediatric emergency medicine non-radiologist point-of-care US to reach consensus on the core applications to include in point-of-care US training for paediatric emergency medicine physicians using the Delphi method [104]. They concluded that applications of abdominal non-radiologist point-of-care US to include in training of non-radiologists were free peritoneal fluid, abscess incision and drainage, central line placement, intussusception, intrauterine pregnancy, bladder volume, and detection of foreign bodies. According to the experts, applications to exclude from training were abdominal aortic aneurism and ovarian torsion.
Studies reporting training strategies for a dedicated application of non-radiologist point-of-care ultrasound
Five articles described a training strategy for a dedicated application of non-radiologist point-of-care US. These included teaching paediatric emergency medicine fellows to measure the pyloric channel when hypertrophic pyloric stenosis is suspected [30], teaching emergency physicians to diagnose hydronephrosis in children with a urinary tract infection [31], teaching emergency physicians to diagnose ileocolic intussusception [23], training paediatric trauma surgeons to perform a FAST [39] and teaching emergency physicians to diagnose free abdominal fluid after trauma [38].
For the single-organ non-radiologist point-of-care US examinations (pyloric channel measurement, detecting hydronephrosis and detecting ileocolic intussusception), the training consisted of a short hands-on training (e.g., about five non-radiologist point-of-care US exams) with or without a preceding didactic lecture about US physics and the specific pathology. In these studies trainees were able to detect the specific pathology with acceptable accuracy (sensitivity: 77% [95% CI: 58–95], specificity: 97% (95% CI: 95–99]) at the end of the training [23, 30, 31].
For the multiple-organ non-radiologist point-of-care US examinations (i.e. post-trauma non-radiologist point-of-care US) the training was more extensive. For the detection of free fluid, trainees followed a 1-day training that consisted of didactic lectures, a videotaped session with instruction, real-time images of pathology and a hands-on workshop on healthy volunteers. After the training, trainees were able to detect free fluid in trauma patients with a sensitivity of 75% (95% CI: 36–95) and a specificity of 97% (95% CI: 81–100) [38]. For the FAST training, paediatric surgeons were trained for about 16 months: they first followed a technical instruction and hands-on training and then they had to perform at least 30 FAST exams. After this training they had to complete an exam on patients with known ascites. Sensitivity for significant amounts of free fluid was 50%, and specificity was 85%. In addition, surgeons reported they never felt they became experts, and they judged 4–10% of non-radiologist point-of-care US exams as inconclusive [39].
Surveys that reported the state of non-radiologist point-of-care ultrasound use and training in paediatric medicine
We identified eight survey studies, published between 2008 and 2018. All aimed to evaluate current state of non-radiologist point-of-care US use and education in a paediatric department (either paediatric emergency medicine, paediatric critical care medicine or neonatal medicine), all studies were performed in North America [6, 7, 96, 98100, 102, 103]. From these surveys it becomes clear that the number of paediatric emergency departments using non-radiologist point-of-care US has increased over the last 12 years (from about 57% to 95%). However, all surveys reported a broad variety of training curricula. Reported methods of training were: bedside training, general emergency department training by a non-radiologist point-of-care US experts, following a formal course, a radiology rotation or training in a skills lab. Reported perceived barriers to implement point-of-care US training were mostly lack of training personnel, lack of time, lack of training guidelines, concerns about liability, and resistance from the radiology department.

Patient perspectives

We identified one study that evaluated the satisfaction with emergency department visits of caregivers of children who received a non-radiologist point-of-care US examination (either for diagnostic or educational purposes) compared to that of children who did not receive a non-radiologist point-of-care US examination (Table 10) [105]. Caregivers’ satisfaction was measured with a visual analogue scale. In this study, there was no difference in satisfaction between patients who did and did not receive a non-radiologist point-of-care US examination, and two-thirds of caregivers reported that they felt the examination improved the child’s interaction with the emergency department physician.
Table 10
Patient perspectives
Author
Year
Country
Department
Design
Ultrasound performer
Lin [105]
2018
USA
Emergency
Observational
EDP
EDP emergency department physician

Financial costs

No publication regarding financial costs was identified.
We identified one publication concerning legal consequences following the use of non-radiologist point-of-care US (Table 11) [106]. This was a retrospective study concerning extent and quality of lawsuits. A search of the United States Westlaw database identified two lawsuits. Both lawsuits concerned the fact that the non-radiologist point-of-care US exam was not performed; in the first case, the placement of a peripherally inserted venous catheter in a child should have been checked with point-of-care US according to the accusers. In the second case, blood was found in the retroperitoneal space and it was claimed that a FAST exam should have been done. In both cases the defendants (i.e. the physicians) were acquitted.
Table 11
Possible harms
Author
Year
Country
Department
Design
Harm
Nguyen [106]
2016
USA
Neonatology, paediatrics
Retro
Two lawsuits were identified, both concerning failure to perform a point-of-care US exam. Both were won by defendants (physicians)
Retro retrospective

Discussion

We conducted this scoping review to gain an overview of current uses of abdominal non-radiologist point-of-care US in children to (1) make radiologists and non-radiologists more aware of its status and (2) prompt both categories of US performers to collaborate with each other. This scoping review demonstrates that non-radiologist point-of-care US is increasingly used and studied in paediatric care for a variety of indications. It also shows that non-radiologist point-of-care US in certain indications can have a positive impact on patient care and outcome, e.g., by reducing number of CTs needed or reducing length of hospital stay. This supports the further development of non-radiologist point-of-care US, and it underlines the need for consensus on who can do which examinations.
This scoping review also assessed the quality of examinations and training of non-radiologists performing abdominal point-of-care US in children. Regarding the quality, in some settings non-radiologists performed equal to radiologists [8, 23, 29, 30], but this was certainly not always the case [20, 31]. Moreover, clinically important missed diagnoses have been reported [39], underlining the need for proper training of non-radiologists. This scoping review makes clear that no standardised training guidelines are available, which is a key issue for the further development of non-radiologist point-of-care US.
Based on the included studies, effective training could start with a short introduction lecture, followed by an online training program (e.g., Kwan et al. [101]), which can be followed at home, and such training could conclude with a non-radiologist point-of-care US rotation in the emergency department, radiology department or both. In the included studies, a basic training of just 1–2 h was found to be sufficient for physicians performing dedicated single-organ point-of-care US exams. We, however, believe that in order to gain more generalizable skills and to ensure a high quality of all operators, a more thorough approach is needed, with paediatric radiologic input. An example of how collaboration between non-radiologists and radiologists could help to maintain quality of the non-radiologist point-of-care US exams is implementing a review process, as Conlon et al. [97] described, where radiologists and non-radiologists come together on regular basis to discuss cases.
There are some important issues to take into consideration before further implementing non-radiologist point-of-care US into daily care. First, very few studies have properly looked at missed diagnoses or incorrect diagnoses. There is a risk of non-radiologist point-of-care US leading to a delayed diagnosis and subsequently to the patient’s wellbeing being at risk. The fact that these cases have not led to published lawsuits is not evidence that this is not a problem. Second, no studies exist on the financial costs of readily available point-of-care US, which could lead to an increase in health care costs; hence a proper cost–benefit analysis is warranted. Also, little attention has been paid to the patient’s perspectives thus far. In addition, few studies compared the performance of the non-radiologists to that of radiologists. Comparing a non-radiologist to a radiologist after completing a proper training program would give more insight into the quality of US examinations. Last, from the included studies we cannot conclude what the impact of is on the clinical daily practice because the studies describe research circumstances. More research on this topic is needed before implementing changes to point-of-care US usage.
The strengths of this scoping review are our thorough search strategy with help of a clinical librarian and the cooperation of both radiologists and non-radiologists. Our scoping review has some limitations as well. First, we limited our scoping review to abdominal US. This was done to keep a clear focus; however, we suspect that a similar result can be found in other fields where non-radiologist point-of-care US is being used, such as in chest or musculoskeletal US. Second, we limited our scoping review to in-hospital use of non-radiologist point-of-care US in developed countries. Our findings might have been different in low-resource countries, where access to radiology departments can be limited. In such a setting non-radiologist point-of-care US might well be the only imaging modality available. In addition, we did not perform a quality assessment of included studies because we aimed to provide a general overview and not to answer a very specific research question through a systematic review. Also, we excluded articles including both children and adults if the data could not be separated. This might have led to a loss of relevant information.

Conclusion

This scoping review supports the further development of non-radiologist point-of-care US and underlines the need for consensus among US performers on who can do which examination after which level of training. More research on training non-radiologists and on cost–benefit of non-radiologist point-of-care US is needed.

Acknowledgements

Owen J. Arthurs is funded by a National Institute for Health Research (NIHR) Career Development Fellowship (NIHR-CDF-2017-10-037). This article presents independent research funded by NIHR and the views expressed are those of the authors and not necessarily those of the National Health Service, NIHR or the Department of Health and Social Care.

Declarations

Conflicts of interest

None
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Anhänge

Supplementary Information

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Metadaten
Titel
Non-radiologist-performed abdominal point-of-care ultrasonography in paediatrics — a scoping review
verfasst von
Elsa A. van Wassenaer
Joost G. Daams
Marc A. Benninga
Karen Rosendahl
Bart G. P. Koot
Samuel Stafrace
Owen J. Arthurs
Rick R. van Rijn
Publikationsdatum
10.04.2021
Verlag
Springer Berlin Heidelberg
Erschienen in
Pediatric Radiology / Ausgabe 8/2021
Print ISSN: 0301-0449
Elektronische ISSN: 1432-1998
DOI
https://doi.org/10.1007/s00247-021-04997-x

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