Abstract
Purpose
Intra-abdominal hypertension (IAH) and Abdominal compartment syndrome (ACS) are relatively rare, but severe complications. Although many advances were made in recent years, the recognition and management remain subject of debate. The aim of this study was to determine the current state of awareness, knowledge and use of evidence-based medicine regarding IAH and ACS among Dutch surgeons.
Methods
A literature-based and expert consensus survey was developed. One surgeon in every hospital in The Netherlands was asked to complete the online questionnaire.
Results
Sixty of 87 (69 %) invited surgeons completed the questionnaire. Intra-abdominal pressure (IAP) was measured using intra-vesical methods by 55 (98 %) respondents. Diuretics (N = 38; 63 %) and laparotomy (N = 33; 55 %) were considered useful treatments for IAH or prevention of ACS by a majority. Only 16 (27 %) respondents used these guidelines in daily practice, and 37 (62 %) respondents are willing to do so. Although 35 (58 %) surgeons agreed that IAH is only a symptom, not requiring treatment. Forty-one percent of experienced respondents suggested that prevalence of ACS remained unchanged. Nearly all respondents (N = 59; 98 %) believed that open abdomen management improves patient outcomes, many (N = 46; 77 %) confirm the high complications rate of this treatment.
Conclusion
The definitions of IAH and ACS and the related diagnostic and therapeutic challenges are relatively well known by Dutch surgeons. Despite limited use of the evidence-based guidelines, the willingness to do so is high. Most respondents favor open abdomen treatment for patients with imminent ACS, despite the high complication rates associated with this treatment.
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Introduction
Abdominal compartment syndrome (ACS) is a severe, but relatively rare complication. IAH is more common and can proceed into ACS in some of cases. Over recent years many advances regarding the recognition and management of ACS have been made. Nonetheless, randomized controlled trials on the subject are still scarce. Current management of ACS is based upon the up-to-date, evidence-based recommendations provided by the World Society of the Abdominal Compartment Syndrome (WSACS) [1]. The strength of these recommendations is of varying quality. As a result, the management of ACS is still subject of debate and differs across hospitals.
Multiple studies have been conducted to identify the then current state of awareness, knowledge and use of evidence-based medicine regarding IAH and ACS. One of the most noticeable findings of these studies was that the awareness of IAP measurements and treatment options of IAH and ACS was generally low [2–9]. In addition, cut-off points for treatment of ACS are poorly known or understood [3, 10–13]. There is little agreement on the indications for open abdomen treatment and what type of temporary abdominal closure devices should be used [14–18]. Most recent studies conclude that awareness among health care providers improved over recent years, but guidelines are still not uniformly applied or knowledge was inadequate [19–21].
The most recent survey was performed in 2010. Since then, new developments, such as the introduction of updated WSACS guidelines in 2013, may have improved outcome. Quality of previous questionnaires was variable. The response rates of these questionnaires ranged from 26 to 90 %. Other limitations were duration of more than 2 years and most studies were carried out by a wide variety of health care workers. Only six specifically focused on surgeons, yet surgeons ultimately decide whether or not to apply an open abdomen decompression [2–4, 8, 14, 15]. No comparable surveys have been performed in The Netherlands.
The primary aim of this study was to identify the current state of awareness, knowledge and use of evidence-based medicine regarding IAH and ACS among Dutch surgeons. Secondary aims were to identify the current annual number of ACS cases per hospital and, to assess outcome of ACS patients.
Methods
This questionnaire study was conducted and reported in accordance with the guidelines for survey research of Bennett et al. [22].
Ethical statement
The current study used data that were obtained from surgeons using a survey. The questionnaire was anonymous. An independent officer of data and privacy protection in our hospital reviewed the survey procedure and confirmed that participants’ anonymity was protected. Since patients were not involved in the study, the institutional Medical Research Ethics Committee did not have to review the protocol.
Questionnaire
The questionnaire was based upon a previously published questionnaire by the WSACS study group [21]. Key questions were adopted and response options were added to make them more up-to-date. The questionnaire was drafted in Dutch and pretested by a panel of five experts and critically appraised on relevance, completeness, and style (OJFVW, MHJV, RSB, DHB, and KAK). The final version of the structured questionnaire consisted of five parts with a total of 29 questions; one part for participant’s information and four parts for questions related to (1) IAP measurement, (2) IAH, (3) ACS, (4) open abdomen treatment and abdominal closure techniques. The full questionnaire is available in English (Appendix 1).
Selection of respondents
Surgical department of all Dutch hospitals with ICU facilities (N = 87) was asked to provide the name of the surgeon with the most ICU affinity. If a hospital had multiple locations with ICU facilities, only one surgeon was selected. All named surgeons were approached by telephone and informed about the purpose and method of the survey. Since one surgeon in every hospital throughout the country was selected, the targeted group of surgeons was presumed a representative cross-section of the care which patients in The Netherlands receive. Dutch surgical departments are relatively well informed and the rate of evidence-based guideline implementation is high. The results of this survey are therefore applicable for to Western European standards. For this survey, a sample size calculation was considered unnecessary.
Distribution of survey
The questionnaire was distributed online using LimeSurvey software [Version 2.05+, LimeSurvey Project Team, Carsten Schmitz (2015), LimeSurvey Project Hamburg, Germany]. After obtaining verbal informed consent, a link to the questionnaire with unique and secure access codes was sent by email. This first invitation was sent on January 29, 2015. Reminders were sent every 2 weeks until the survey was closed on April 13, 2015. An opt-out link was clearly marked, the questionnaire could also be sent by mail or email if requested.
Data
Data were stored online by a secured function of the software used. Following survey closure, data were downloaded to an SPSS file. Questionnaires that were completed on paper were entered manually into the SPSS database. Only complete data sets were included in the analysis.
Analysis
All data were of categorical nature and are shown as numbers with corresponding percentages. Descriptive analysis was performed in SPSS version 21.0 (SPSS Statistics for Windows, Released 2012, Armonk, New York, IBM Corporation). No comparisons were made with previously performed surveys since differences between questionnaires and populations were considered too large.
Results
Respondents
Sixty surgeons completed the questionnaire (response rate: 69 %). Ten partial responses were excluded. Most respondents had a primary focus on trauma surgery (N = 29; 48 %) or oncological surgery (N = 20; 33 %, Fig. 1). The majority (N = 38; 63 %) had over 10 years of surgical experience and more than half of respondents worked in a general teaching hospital (N = 34; 57 %).
Intra-abdominal pressure measurements
IAP measurements were performed in 58 (96 %) of the hospitals. Forty-seven (78 %) respondents claimed to know the difference between IAH and ACS, and 57 (95 %) respondents had seen at least one patient with ACS.
Fifty-five (98 %) respondents use intra-vesical methods for IAP measurement. The largest group of respondents (N = 14; 25 %) measures IAP three times daily on average (Fig. 2).
Forty-nine (88 %) respondents wait with measuring of IAP until there is a clear suspicion for ACS, and 22 (39 %) respondents start measurements as soon as risk factor(s) for ACS are identified (Fig. 3).
Intra-abdominal hypertension
Forty-two (70 %) respondents claimed to use the definition of IAH as set by the WSACS (Table 1). Of the seven treatment options listed for IAH, only diuretics (N = 38; 63 %) and laparotomy (N = 33; 55 %) were considered very useful or fairly useful by the majority of respondents (Fig. 4). Thirty-five (58 %) respondents agreed to the statement that IAH is only a symptom and as such needs no treatment.
Abdominal compartment syndrome
For ACS, the majority of respondents (N = 31, 52 %) used the definition as proposed by the WSACS (Fig. 5). It was noteworthy that 17 (28 %) respondents used a higher threshold for ACS.
Most respondents (N = 33; 55 %) were not familiar with the WSACS guidelines for the treatment of ACS. Whereas 27 (45 %) respondents were familiar with the guidelines, only 16 (27 %) actually use them in daily practice. Another 37 (62 %) respondents is willing to do so in the future (Table 2). A minority (N = 6; 10 %) disputes that the guidelines improve outcome of patients with ACS.
Eighteen (30 %) respondents answered that patients with ACS should be treated with surgical decompression in 76 % to 100 % of cases in their hospital (Fig. 6). Another 18 (30 %) indicated that this was done in 51–75 % of cases.
The vast majority of respondents considered oliguria, ventilation pressure, acidosis, lactate, and cardiac output as relevant when deciding for a surgical abdominal decompression (Fig. 7). A large group (N = 26; 43 %) stated that a superior indicator for surgical decompression would be a useful addition into clinical practice (Table 3).
The mortality rate of patients with ACS who are not treated with surgical decompression was estimated between 26 and 50 % by 18 (30 %) respondents and between 51 and 75 % by 22 (37 %) respondents (Fig. 8). If patients with ACS were treated with surgical decompression, the largest group of respondents (N = 28; 47 %) estimated a mortality rate of 10–25 %.
Open abdomen treatment and abdominal closure techniques
Fifty-three (88 %) respondents considered surgical abdominal decompression useful in the prevention of ACS (Table 4). However, the majority felt that ACS may not always be prevented.
The respondents were asked which factors would affect their decision whether or not to close the abdomen after surgical decompression. Most respondents answered that an increase in ventilation pressures is either useful (N = 36; 60 %) or very useful (N = 12; 20 %) in this decision (Fig. 9). In addition, tension on the abdominal wall while closing the abdomen, planned reoperation, application of abdominal packings, hemodynamic instability at closure and visceral edema were also considered useful by the majority of the respondents.
If primary closure is not possible, several devices are available for temporary closure. Among the respondents, application of a Vicryl® mesh was the most popular method for temporary closure, chosen by 38 (63 %) respondents (Table 5). Many respondents selected multiple methods of temporary closure, 22 (37 %) respondents selected two methods and 18 (30 %) even selected three.
The largest group (N = 27; 45 %) of respondents prefers definitive abdominal closure in multiple stages (Table 6). An almost equally large group (N = 26; 43 %) prefers the component separation technique.
Almost all respondents (N = 59; 98 %) believed that open abdomen management improves patient outcomes, of which the majority (N = 46) also acknowledged the high complication rate associated with open abdomen management (Table 7).
Discussion
This study is the first survey detailing awareness, knowledge, and use of evidence-based medicine and outcome regarding intra-abdominal hypertension and abdominal compartment syndrome among Dutch surgeons. The definitions of the WSACS are well known now, but the clinical practice guidelines of this society are still waiting to be implemented in hospitals. Much disagreement exists today with respect to treatment and outcome of intra-abdominal hypertension and abdominal compartment syndrome among Dutch surgeons.
Ninety-five percent of respondents had previously treated a patient with ACS in their hospital. This was in line with the 97 % reported by Tiwari et al. [12]. IAP measurements were regularly performed in 96 % of the participating hospitals, which was markedly higher than the 31–47 % reported in other surveys [4, 5]. The frequency of IAP measurements, however, varied greatly among hospitals. In 13 (23 %) hospitals, IAP was measured less than once per 24 h. This frequency is rather low since IAP related morbidity can potentially develop or progress within a few hours [23].
There is still no consensus on the management of IAH and ACS. Although many respondents believed that IAH is only a symptom which does not necessarily needs to be treated, several different treatment options for IAH to prevent ACS were considered useful. For example, the use of diuretics and laparotomy are considered valuable. The majority of respondents were indifferent about other treatment options or regarded them as useless. This indifference about IAH treatment has previously been noted by Kimball et al. [2].
Most respondents (88 %) think that surgical decompression could prevent ACS and improve patient outcomes. This is markedly higher than the 60 % of respondents who would recommend decompression laparotomy as reported by Zhou et al. [9]. Despite several indicators for surgical abdominal decompression were believed to be useful, 43 % of our respondents felt the need for a superior indicator.
There is disagreement between respondents and literature regarding temporary abdominal closure (TAC) devices. Respondents reported to prefer mesh assisted TAC. Although evidence is not conclusive, literature slightly favors vacuum assisted techniques [24]. Definitive closure techniques ideally bring the edges of the abdominal fascia together primarily (primary closure). If this is not feasible, simple coverage or functional closure can be provided. These techniques are generally regarded as inferior with respect to patient outcome. Respondents seem to be aware of this, since they mostly preferred staged abdominal closure, followed by the component separation closure technique.
The vast majority of respondents were convinced of the necessity of open abdomen treatment for patients with imminent ACS, even though they were aware of the high complication rate associated with this treatment. They estimate that benefits of open abdomen treatment outweigh the chance of complications. This statement is confirmed by the presumed mortality reduction as result of open abdomen decompression as demonstrated in Fig. 9. The current study confirms there is a large support for this treatment, even though there is disagreement recent literature regarding the benefits of open abdominal decompression in pancreatitis patients with ACS [25, 26].
The strength of the current study is its robust methodology. The survey was based on previous questionnaires, was developed by an expert group, and was repeatedly pretested. Surgeons were kindly, but persistently urged to participate. The online software enables swift responding and easy data collection. The nationwide coverage of this survey is also considered a strength.
Taken into account the 10 incomplete responses, the response rate of 69 % was fairly high. This number is at the upper end of response rates of the previously performed surveys on IAH and ACS (range 26–90 %) [2–21].
The skewed distribution of the primary focus of respondents can be regarded a limitation of this study, but is representative of the clinical practice in The Netherlands. The overrepresentation of trauma surgeons and oncological surgeons may be the result of the connection between these sub-specializations and intensive care medicine. It was, however, not the intention to approximate a cross-section of all Dutch surgeons, but rather of the care patients actually receive. Assuming that patients will usually be treated by a physician with the most relevant knowledge and experience, we are convinced that the results of this study really demonstrate the awareness and knowledge of the surgeon with the largest relevant experience and knowledge. Another shortcoming is that the estimation of change in ACS occurrence over the last 10 years could be subject to recall bias. Although this was an important question, its outcomes were likely to be inaccurate. For example, six respondents indicated that a decrease in ACS incidence did not occur, while they ticked a lower number of cases category for last year compare than for 10 years ago (Table 2). However, this question does give insights in the perception of the experienced surgeon.
The overall knowledge and implementation of WSACS recommendations were lower than expected. This may be due to the fact that the vast majority of the respondents received their surgical training before the WSACS guidelines were developed. ACS treatment is currently implemented in these training programs. The results of the current study and the implementation in surgical training programs should result in increased awareness in the future.
In conclusion, the definitions of IAH and ACS and related diagnostic and therapeutic challenges are relatively well known among Dutch surgeons. Although use of the WSACS guidelines is currently limited, the willingness to do so is large. The vast majority of respondents are convinced of the necessity of open abdomen treatment for patients with imminent ACS, even though this treatment is associated with high complication rates. To decrease the complication rate, many respondents support the need for a superior indicator for surgical abdominal decompression.
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Acknowledgments
Prof.Dr. Roelf S. Breederveld (trauma surgeon, Rode Kruis Ziekenhuis, Beverwijk, The Netherlands), Dr. Desiree H. Burger (surgeon-intensivist, St. Elisabeth Ziekenhuis, Tilburg, The Netherlands), and Dr. Karel A. Kolkman (trauma surgeon, Rijnstate Ziekenhuis, Arnhem, The Netherlands) are acknowledged for their assistance and efforts as expert in drafting and pretesting the questionnaire.
IAH-ACS study group
Bosma E (Martini Ziekenhuis, Groningen, The Netherlands), Breederveld RS (Rode Kruis Ziekenhuis, Beverwijk, The Netherlands), Breedveld PH (Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands), Bronkhorst MWGA (MC Haaglanden Bronovo Nebo, Den Haag, The Netherlands), Buijk SE (IJsselland Ziekenhuis, Capelle a/d IJssel, The Netherlands), Burger DHC (St. Elisabeth Ziekenhuis, Tilburg, The Netherlands), Claassen ATPM (Twenteborg Ziekenhuis, Almelo, The Netherlands), Cleffken BI, (Maasstad Ziekenhuis, Rotterdam, The Netherlands), De Roos MAJ (Ziekenhuis Rivierenland, Tiel, The Netherlands), De Vries DP (Ommelander Ziekenhuisgroep, Delfzijl, The Netherlands), De Wit RJ (Medisch Spectrum Twente, Enschede, The Netherlands), Derom A (Zorgsaam Zeeuws-Vlaanderen, Terneuzen, The Netherland), Drixler T (Bravis Ziekenhuis, Bergen op Zoom, The Netherlands), Dwars BJ (Slotervaartziekenhuis, Amsterdam, The Netherlands), Eversdijk MG (Ziekenhuis St. Jansdal, Harderwijk, The Netherlands), Goslings JC (Academisch Medisch Centrum, Amsterdam, The Netherlands), Grevenstein WMU (UMC Utrecht, Utrecht, The Netherlands), Hammacher ER (St. Antonius Ziekenhuis, Nieuwegein, The Netherlands), Heetveld MJ (Kennemer Gasthuis, Haarlem, The Netherlands), Heres P, (Waterlandziekenhuis, Purmerend, The Netherlands), Kievit JK (Westfriesgasthuis, Hoorn, The Netherlands), Kloppenberg FWH (Ziekenhuis Bethesda, Hoogeveen, The Netherlands), Kolkman KA (Rijnstate Ziekenhuis, Arnhem, The Netherlands), Leijtens JWA (Laurentius Ziekenhuis, Roermond, The Netherlands), Lettinga T (St. Jans Gasthuis, Weert, The Netherlands), Liem MSL (Deventer Ziekenhuis, Deventer, The Netherlands), Logeman F (Beatrix Ziekenhuis, Gorinchem, The Netherlands), Merkus JWS (HagaZiekenhuis, Den Haag, The Netherlands), Mulder J (Zaans Medisch Centrum, Zaandam, The Netherlands), Oprel P (Erasmus MC, Rotterdam, The Netherlands), Pierie JPEN (Medisch Centrum Leeuwarden, Leeuwarden, The Netherlands), Ploeg AJ (Diaconessenhuis, Leiden, The Netherlands), Punt BJ (Albert Schweitzer Ziekenhuis, Dordrecht, The Netherlands), Ritchie ED (Rijnland Ziekenhuis, Leiderdorp, The Netherlands), Schasfoort RA (Scheper Ziekenhuis, Emmen, The Netherlands), Schipper IB (Leids Universitair Medisch Centrum, Leiden, The Netherlands), Schmitz RF (Groene Hart Ziekenhuis, Gouda, The Netherlands), Simons MP (Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands), Sintenie JB (Elkerliek Ziekenhuis, Helmond, The Netherlands), Slooter GD (Máxima Medisch Centrum, Veldhoven, The Netherlands), Smakman N (Diakonessenhuis, Utrecht, The Netherlands), Smulders JF (Catharina Ziekenhuis, Eindhoven, The Netherlands), Sosef NL (Spaarne Ziekenhuis, Hoofddorp, The Netherlands), Staarink M (Van Weel-Bethesda Ziekenhuis, Dirksland, The Netherlands), Stevens CT (Bernhoven, Uden, The Netherlands), Tommee JH (Röpcke-Zweers Ziekenhuis, Hardenberg, The Netherlands), Van der Elst M (Reinier de Graaf Gasthuis, Delft, The Netherlands), Van der Kolk BM (Radboudumc, Nijmegen, The Netherlands), Van der Linden FThPM (St. Anna Ziekenhuis, Geldrop, The Netherlands), Van Geloven AAW (Tergooi Ziekenhuizen, Hilversum, The Netherlands), Van Helden SH (Isala Klinieken, Zwolle, The Netherlands), Van Marle AGJ (Vlietland Ziekenhuis, Schiedam, The Netherlands), Veltkamp SC (Ziekenhuis Amstelland, Amstelveen, The Netherlands), Verbeek PCM (Flevoziekenhuis, Almere, The Netherlands), Waleboer M (Admiraal De Ruyter Ziekenhuis, Goes, The Netherlands), Wieland AW (VieCuri Medisch Centrum, Venlo, The Netherlands), Zuidema WP (VU Medisch Centrum, Amsterdam, The Netherlands).
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All authors (Steven G. Strang, Esther M.M. Van Lieshout, Roelof A. Verhoeven, Oscar J.F. Van Waes, and Michael H.J. Verhofstad) report no conflicts of interest relevant to this article. No funds were received by any of the authors in support of this study.
Ethical approval
Since patients or animals were not involved in the study, the institutional Medical Research Ethics Committee did not have to review the protocol.
Informed Consent
An informed consent procedure was not needed. Data were obtained from surgeons using a survey. The questionnaire was anonymous. An independent officer of data and privacy protection in our hospital reviewed the survey procedure and confirmed that participants’ anonymity was protected.
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IAH-ACS study group members are listed under Acknowledgments.
Appendix 1
Appendix 1
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Strang, S.G., Van Lieshout, E.M.M., Verhoeven, R.A. et al. Recognition and management of intra-abdominal hypertension and abdominal compartment syndrome; a survey among Dutch surgeons. Eur J Trauma Emerg Surg 43, 85–98 (2017). https://doi.org/10.1007/s00068-016-0637-x
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DOI: https://doi.org/10.1007/s00068-016-0637-x