Mistakes in…

Small bowel bleeding and how to avoid them

Edward J. Despott, Andrea Telese and Alberto Murino

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Mistakes in small bowel bleeding and how to avoid them
Image courtesy of EJ Despott.

Over the past 17 years, the disruptive impact of technologies including small bowel capsule endoscopy (SBCE), device-assisted enteroscopy (DAE) and dedicated cross-sectional imaging has transformed the investigation and management of small bowel pathology. Although a small bowel source only accounts for 5–10% of all cases of gastrointestinal bleeding,1–2 definitive management of small bowel bleeding even in the current era of advanced imaging, can still pose formidable challenges.  

In this brief article, we highlight frequent mistakes made in the investigation and management of small bowel bleeding and discuss strategies for their avoidance. 

© UEG 2018 Despott, Telese and Murino.

Cite this article as:
Despott EJ, Telese A and Murino A. Mistakes in small bowel bleeding and how to avoid them. UEG Education 2018; 18: 27–29.

Correspondence to:

Conflicts of interest:
The authors declare there are no conflicts of interest.

Published online:
September 27 , 2018.

Mistake 1
Incorrect definition

Small bowel bleeding should be defined as bleeding that occurs distal to the ampulla of Vater and proximal to the ileocaecal valve.2,3 In the context of a negative upper gastrointestinal endoscopy and colonoscopy, the term ‘suspected small bowel bleeding’ is preferred to the term ‘obscure gastrointestinal bleeding’, which should be reserved only for cases in which the source of the bleeding cannot be identified despite the use of dedicated small bowel imaging.2,3 Small bowel bleeding should be further characterised as ‘overt’ (with manifestations of melaena +/– haematochezia) or ‘occult’ (when there is no actual visible evidence of bleeding, despite the presence of iron deficiency anaemia [IDA] and/or a guaiac-positive stool test).2,3

Mistake 2
Delaying or not considering transfer to a dedicated tertiary referral centre

Although small bowel bleeding may be indolent, it retains the risk of evolving into a medical emergency and thorough assessment, to identify the underlying cause, remains crucial. During evaluation, the patient’s age, comorbidities and pattern of bleeding (if overt) may point to a more specific underlying aetiology and may guide the steps taken for further investigation and management.2–5 The potential complexity of this condition means that early referral to a specialised tertiary centre is strongly recommended. Such a tertiary referral centre should offer all diagnostic and therapeutic modalities, including: dedicated diagnostic and interventional radiology, dedicated diagnostic and interventional small bowel endoscopy and, importantly, access to general anaesthesia. 

Mistake 3
Overlooking pathology within the upper and/or lower gastrointestinal tract

In the context of ‘suspected small bowel bleeding’, the quality of the index upper gastrointestinal endoscopy and colonoscopy should always be taken into consideration. With this in mind, the risk of missed pathology2,3,6,7 may warrant the need for repeat upper and lower gastrointestinal imaging with optimal preparation. This second look should be aimed at minimising the risk of missed lesions, particularly in the context of brisk overt gastrointestinal bleeding.8 

Mistake 4
Overlooking the need for dedicated radiological evaluation

Although SBCE should be considered as the next line of investigation after a negative upper and lower gastrointestinal endoscopy in the context of suspected small bowel bleeding2,3 (figure 1), having a low threshold for early evaluation with dedicated small bowel cross-sectional imaging is advised. This advice is particularly relevant in the case of younger patients (especially those <40 years of age), who present with overt bleeding, in whom the underlying aetiology is more likely to be related to intramural small bowel neoplasia than it is in older patients2,3,9. Dedicated small bowel radiology may also have a pivotal role in determining a definitive therapeutic option for patients who have brisk small bowel bleeding with haemodynamic instability. 

Active small bowel bleeding

Figure 1 | Active small bowel bleeding as seen at small bowel capsule endoscopy (SBCE). Image courtesy of EJ Despott. 

Mistake 5
Delaying investigation

One of the characteristics of small bowel bleeding is its intermittent occurrence. This very feature makes effective investigation and accurate identification of the culprit source highly time-sensitive. International guidelines emphasising the importance of timely investigation are substantiated by evidence that the diagnostic yield of early investigation is significantly higher than that for delayed investigation.2,3,10–13 A delay in investigation may result in missed opportunities to definitively identify the correct aetiology, increased patient morbidity, costs relating to rebleeding, and unnecessary investigations pursued as a result of false-negative findings. A rapid and timely investigatory approach remains paramount for effective and definitive intervention.14 

Mistake 6
Not choosing the right investigation or treatment strategy

Although in most clinical scenarios, as recommended by international guidelines and consensus statements,2,3,15 SBCE is considered the modality of choice for mucosal visualisation in the context of suspected small bowel bleeding, consideration should always be given to complementary dedicated small bowel cross-sectional imaging, especially in the context of a negative SBCE performed for intermittent overt bleeding. 

In the acute setting, in which a patient is actively bleeding, proceeding straight to anterograde (per-oral) DAE has the potential to be more clinically effective than SBCE in that it may also facilitate the rapid application of definitive endotherapy.15,16 This consideration also stresses the importance of early referral to a specialist centre that offers a comprehensive small bowel service, with dedicated expertise, complementary modalities and ancillary back up. In the nonemergent setting, the DAE approach should be guided by the findings of SBCE and/or dedicated small bowel cross-sectional imaging. 

Mistake 7
Not achieving adequate mucosal visualisation

Inadequate mucosal visualisation may increase the risk of missing a culprit lesion and every effort should be made to optimise the views obtained. In the context of SBCE, although the subject is still contentious, the latest ESGE technical review on small bowel endoscopy recommends the use of purgatives and an antifoaming agent, as well as fasting prior to SBCE to enhance mucosal visualisation and potentially reduce the risk of missed pathology.15 

In the context of DAE, particularly in the setting of active bleeding, adequate mucosal visualisation can be challenging. In our practice, and as recommended by the ESGE technical review,15 we perform the following: active mucosal washing with saline (using a motorised jet pump), selective application of antifoaming agents (such as simethicone, used judiciously, since this may also cloud the visual field) and selective administration of intravenous hyoscine-N-butylbromide to reduce peristaltic activity (unless contraindicated).

Careful inspection of the small bowel mucosa should be achieved both on insertion and withdrawal—in the case of double-balloon enteroscopy (DBE), the maintenance of gentle scope-balloon inflation on enteroscope withdrawal may help to straighten mucosal folds to further enhance visualisation. The use of a very short, soft, distal attachment is also recommended.17 In our own practice, we also prefer to substitute gaseous insufflation with saline-immersion since this may further improve visualisation of an active bleeding point.18 The placement of an endoclip just proximal to a lesion, at the time it is identified, acts as a reliable reference point particularly during active bleeding,  when adequate views may be difficult to reachieve or maintain. The endoclip may also serve as a reference point for interventional radiology, should this be required. For retrograde DAE procedures, optimal bowel preparation with purgatives is essential.  

Mistake 8
Inadequate reporting

Preliminary small bowel diagnostic investigations (including SBCE and dedicated cross-sectional imaging) should be adequately reported. Such reports should provide a detailed description of any lesion that is identified. The report should also describe the approximate/inferred location of a lesion within the small bowel, since this will serve as a guide for further investigation/endotherapy by DAE, as well as the approach route taken.19,20 Providing inadequate detail in a report may result in unnecessary additional invasive investigation, morbidity and costs. 

Mistake 9
Having an incorrect strategy for endotherapy at DAE

Although all available haemostatic modalities can be used during DAE, the unique characteristics of the small bowel, its length and its very thin wall (3mm in thickness), pose additional risks and challenges that warrant the expertise best provided in high-volume tertiary centres. Additional precautions also need to be taken when treating vascular lesions with argon plasma coagulation (APC), since this may result in focal perforation.15 In our practice, we only use low flow argon (1l/min) at a maximum (noncontact) power of 25W and, in addition, we inject a pretreatment bleb of submucosal saline beneath the vascular lesion before the application of APC, to reduce the perforation risk. 

Treatment of larger vascular lesions, particularly those that contain an arteriolar component as manifest through visible pulsations (Yano-Yamamoto small-intestine vascular lesions [SIVLs] classification 2a, 2b, 3)21 is more effectively and safely achieved using endoclips rather than repeat APC (figure 2). Once again, the use of endoclips provides a reference point for interventional radiology, should it be required. 

The approximate location of large culprit lesions should also be marked by a submucosal tattoo of sterile carbon particles for future endoscopic or surgical reference. The approximate location (vis-à-vis the pylorus or ileocaecal valve) should be clearly documented in the report.

Active small bowel bleeding

Figure 2 | Active small bowel bleeding as seen at double-balloon enteroscopy (DBE) with an endoclip being applied to the culprit small-intestine vascular lesion (SIVL). Image courtesy of EJ Despott. 

Mistake 10
Relying on false-negative investigations and not persevering with repeat investigation and endotherapy

In light of its intermittent nature, potentially false-negative investigation should not be relied on when there is a high suspicion for a small bowel source of gastrointestinal bleeding. In this context, investigations (SBCE +/- dedicated cross-sectional imaging +/- DAE) should be repeated as close to an episode of rebleeding as possible, since this has been shown to be more fruitful for identifying the culprit lesion.22–25 Even after adequate endotherapy has been applied at DAE, SIVLs have a tendency to cause rebleeding. Despite this natural history, it is a mistake to not refer for further treatment, because repeat endotherapy at DAE improves overall long-term outcomes, transfusion requirements and episodes of rebleeding.26  

  • About the Authors
  • Your small bowel bleeding briefing
About the Authors

Edward J. Despott is the lead of the Royal Free Unit for Endoscopy in London, one of the busiest comprehensive small bowel endoscopy tertiary services in Europe. His other specialist interests include endoscopic submucosal dissection (ESD), saline-immersion endoscopic resection techniques and endoscopy education. 

Andrea Telese is an endoscopy fellow at the Royal Free Unit for Endoscopy and UCL Institute for Liver and Digestive Health in London. His interests include endoscopy education and research.

Alberto Murino is a consultant gastroenterologist and interventional endoscopist, who co-runs the small bowel endoscopy service at the Royal Free Unit for Endoscopy in London. His other specialist interests include endoscopic submucosal dissection (ESD), saline-immersion endoscopic resection techniques and endoscopy education.

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References
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