Educational outreach visits to improve venous thromboembolism prevention in hospitalised medical patients: a prospective before-and-after intervention study
© Duff et al.; licensee BioMed Central Ltd. 2013
Received: 14 November 2012
Accepted: 25 September 2013
Published: 8 October 2013
Despite the availability of evidence-based guidelines on venous thromboembolism (VTE) prevention clinical audit and research reveals that hospitalised medical patients frequently receive suboptimal prophylaxis. The aim of this study was to evaluate the acceptability, utility and clinical impact of an educational outreach visit (EOV) on the provision of VTE prophylaxis to hospitalised medical patients in a 270 bed acute care private hospital in metropolitan Australia.
The study used an uncontrolled before-and-after design with accompanying process evaluation. The acceptability of the intervention to participants was measured with a post intervention survey; descriptive data on resource use was collected as a measure of utility; and clinical impact (prophylaxis rate) was assessed by pre and post intervention clinical audits. Doctors who admit >40 medical patients each year were targeted to receive the intervention which consisted of a one-to-one educational visit on VTE prevention from a trained peer facilitator. The EOV protocol was designed by a multidisciplinary group of healthcare professionals using social marketing theory.
Nineteen (73%) of 26 eligible participants received an EOV. The majority (n = 16, 85%) felt the EOV was effective or extremely effective at increasing their knowledge about VTE prophylaxis and 15 (78%) gave a verbal commitment to provide evidence-based prophylaxis. The average length of each visit was 15 minutes (IQ range 15 to 20) and the average time spent arranging and conducting each visit was 92 minutes (IQ range 78 to 129). There was a significant improvement in the proportion of medical patients receiving appropriate pharmacological VTE prophylaxis following the intervention (54% to 70%, 16% improvement, 95% CI 5 to 26, p = 0.004).
EOV is effective at improving doctors’ provision of pharmacological VTE prophylaxis to hospitalised medical patients. It was also found to be an acceptable implementation strategy by the majority of participants; however, it was resource intensive requiring on average 92 minutes per visit.
KeywordsEducational outreach visit Implementation science Venous thromboembolism prevention
Venous thromboembolism (VTE) is a common and potentially devastating complication of hospitalisation. Failure to provide appropriate VTE prophylaxis can result in serious adverse outcomes including symptomatic deep vein thrombosis (DVT) or pulmonary embolism (PE), post-thrombotic syndrome, chronic pulmonary hypertension, recurrent VTE, or fatal PE. Each year in the United States there are an estimated one million cases of VTE resulting in approximately 300,000 deaths annually . Together, the combined morbidity and mortality associated with this disease process result in an estimated economic burden to the nation of $1.5 billion/year .
People who are hospitalised with acute medical illness are particularly at risk of VTE. Without effective prophylaxis 10-20% of medical patients will develop an objectively diagnosed VTE which, in turn, has the potential to result in fatal PE. Within the acute patient population, fatal PE accounts for 10% of all deaths making it the single most preventable cause of hospital related mortality . Contrary to common held perceptions, a significant proportion of these deaths occur in the medical patient population. A retrospective evaluation of 6833 autopsies found that 80% of the fatal PEs occurred in medical (nonsurgical) patients .
VTE in hospitalised medical patients is preventable; evidence-based guidelines recommend the use of low molecular weight heparin, low dose unfractionated heparin, or fondaparinux for patients deemed to be at increased risk of VTE [5, 6]. Risk factors for VTE in medical patients include active cancer, previous VTE, reduced mobility, known thrombophylic condition, increased age, heart and/or respiratory failure, myocardial infarction, ischaemia stroke, acute infection or rheumatologic condition, obesity, and ongoing hormonal treatment [5, 6]. A number of tools have been developed and validated to aid in the assessment of VTE risk and help determine the onset, intensity, type, and duration of recommended prophylaxis [7–9].
Despite the widespread availability of evidence-based guidelines on VTE prevention hospitalised medical patients still receive suboptimal prophylaxis [10–13]. One international study, the ENDORSE study, found that only 40% of at risk medical patients (n = 37,356) were receiving the recommended prophylaxis [12, 14]. Numerous strategies to improve VTE prevention in hospitalised patients have been studied with varying degrees of success [15–19]. The evidence suggests that active implementation strategies that engage the target population are more effective than passive strategies at changing clinician behaviour and improving prophylaxis rates [15, 17, 19].
An educational outreach visit (EOV) is an active implementation strategy that entails a structured one-to-one educational visit conducted in the clinical setting of the participant by a trained facilitator . This intervention is also known as university-based educational detailing, academic detailing, and educational visiting . An EOV is based on social marketing theory. It relies on the psychological principles of persuasion to influence clinician behaviour and promote evidence-based practices . A Cochrane systematic review of this implementation strategy concluded that EOVs, alone or in combination with other interventions, are consistently effective at influencing prescribing practices . There have been few studies, however, examining the clinical impact of EOVs on the provision of VTE prophylaxis to medical patients and no previous studies on its acceptability or utility.
To evaluate the acceptability, utility and clinical impact of an EOV on doctors’ provision of pharmacological VTE prophylaxis to hospitalised medical patients.
The target population was doctors who regularly admit medical (nonsurgical) patients to the study site. Regular was defined as being in the top two quartiles of admitters which equated to a minimum of 40 admissions per year.
The study site is a 270 bed acute care private hospital in Sydney, Australia. It provides services in all major fields of medicine and surgery with the exception of obstetric and paediatric care. The hospital has approximately 20,000 admissions annually, with approximately 30% admitted for acute medical illness. As is the case in most private hospitals in Australia, patients are cared for by consulting medical officers with minimal support from junior medical staff.
The study received ethics clearance from the St Vincent’s Human Research Ethics Committee (File number 11/051).
Educational outreach visit protocol
Planning the visit
Contact the target population by email, phone, or in person
Negotiate a convenient time and location for the visit
Reconfirm arrangements prior to the visit
Discuss with the research team any recruitment difficulties
Setting the scene
Ensure appropriate space for the discussion
Engage in small talk to place the participant at ease
Explain the purpose of the visit
Negotiate the session length (approximately 20 minutes)
Introduce the four key messages and identify participants specific needs
Building trust, credibility and likability
Mention the key opinion leaders in support of the project
List the project’s academic and clinical affiliations
Highlight your own clinical expertise in the area
Attempt to uncover personal similarities between participant and yourself
Offer genuine praise where appropriate
Promoting two-sided communication
Ask open ended questions
Use minimal encouragement techniques
Paraphrase and reflect on the participants comments
Anticipate and acknowledge controversial issues
Overcome any objections and handle challenging responses
Delivering key message(s)
VTE is an important healthcare issue
Assess individual patient risk
Provide evidence-based VTE prophylaxis and patient education
Monitor and reassess each patient during their hospital stay
Reflect on the discussion
Reiterate the key message(s) discussed
Give the participant the printed resource material to keep
Gain commitment to provide evidence-based prophylaxis
Follow-up via email, phone, or in person
Fulfil any commitments made during the visit
The EOV facilitator and research team received training on social marketing and persuasive communication techniques in a two day workshop run by an independent not-for-profit organisation (the National Prescribing Service) with extensive experience in the use of EOVs for the promotion of the quality use of medicine in the Australian healthcare system.
The multidisciplinary group also developed the content to be delivered by the facilitator during the EOV. The content was limited to four key messages: 1) VTE is an important healthcare issue which results in significant mortality, morbidity and resource expenditure; 2) patients must have their risks assessed including clotting risk, bleeding risk, and contraindications to prophylaxis; 3) patients must receive appropriate prophylaxis based on their risk assessment; and 4) patients must be monitored for signs of VTE or prophylaxis related adverse events. A concise graphic educational resource was developed to accompany and reinforce the verbal message.
Two trial visits were conducted prior to the intervention period to identify potential issues and familiarise the facilitator with the protocol.
Outcome measures and data collection
Acceptability was measured with post intervention participant and facilitator surveys. The participants’ survey and self-addressed envelope were given to the participants by the facilitator following the EOV. The survey contained eight questions in total; six questions related to the doctor’s beliefs about the effectiveness of the EOV at increasing knowledge and addressing concerns about VTE prophylaxis for medical patients. The remaining two questions asked participants how likely it was that they would participate in a program such as this in the future, and how likely it was that the intervention would influence their clinical practice. The EOV facilitator was also asked to complete a post intervention survey appraising the participants’ level of interest, participation and comprehension. All survey questions were answered on a five point likert scale.
Descriptive data on the practical application and utility of the intervention were recorded on a data collection form by the EOV facilitator. The information included the time and effort spent arranging the EOV, the time spent conducting the EOV, the number of interruptions and the time spent on them, the location of the EOV, the facilitator’s self-assessed adherence to the elements of the study protocol, and whether or not the participant committed to provide evidence-based prophylaxis.
VTE risk factors & contraindications to prophylaxis
Risk factors & contraindications
Pre intervention (n = 150)
Post intervention (n = 150)
High-risk of VTE
History of VTE
Decompensated heart failure
Acute on chronic lung disease
Age > 60 years and immobile
Acute inflammatory disease
Multiple additional risk factors
Additional risk factors
Immobility (<60 years)
Familial history of VTE
High risk of bleeding
Severe hepatic disease
Heparin induced thrombocytopenia
The study was designed to detect a change in prescribing practice of 15% (from 50% to 65% appropriate prophylaxis). This estimate of effect was based on two previous studies which had used EOVs to improve VTE prophylaxis in the acute care setting [25, 26]. A total sample size of 300 patients (150 pre and 150 post intervention) was necessary to power the study at 80% with a significance level of 5%.
Data were entered into SPSS version 18 for analysis. Categorical data were summarised as number and percentage and contiguous data were summarised as median and interquartile (IQ) range. For comparisons between groups, the T test, or Mann–Whitney U test, was used for continuous variables (age, number of years post registration) and the Chi-square test was used for dichotomous variables (appropriate prophylaxis, risk factors, sex, specialty unit, admitting specialty). The difference in pharmacological prophylaxis rates before and after the intervention was calculated with 95% confidence intervals. The p value for statistical significance was set at <0.05.
Characteristics of the target population
Characteristics of the target population
Received the intervention (n = 19)
Declined or unavailable (n = 7)
Median (IQ range)
Years post registration
Characteristics of the audited patients
Characteristics of the audited patients
Pre intervention (n = 150)
Post intervention (n = 150)
Acceptability of the Educational Outreach Visit
How effective was the Educational Outreach Visit in…
Increasing or refreshing your knowledge about VTE prophylaxis for medical patients?
Addressing concerns you have had about providing VTE prophylaxis to medical patients?
Providing information about the significance of VTE as a healthcare issue?
Providing information about VTE risk assessment for medical patients?
Providing information about selecting appropriate VTE prophylaxis for medical patients?
Providing information about the ongoing monitoring of patients risk and response to prophylaxis?
How likely is it that…
You will participate in another educational program such as this one in the future?
This educational visit will influence your clinical practice?
What was the participants perceived level of…
Interest in the topic presented?
Participation during the visit?
Comprehension of the information provided?
Utility of the educational outreach visit
Median (IQ range)
Number of contacts needed to arrange the EOV
Number of contacts needed to arrange the visit
Number of cancelled visits prior to the visit
Time spent arranging and conducting the EOV (min)
Time spent arranging the visit
Time spent customising material
Time spent waiting for the participant
Time spent with the participant during the visit
Time spent on interruptions
Total time spent on the visit
Percent of protocol elements delivered to participant
Location of the EOV
Other public area
Other private area
Outcome of the EOV
Participant agreed to provide evidence-based prophylaxis
There was a significant improvement in the proportion of medical patients who received appropriate pharmacological VTE prophylaxis following the intervention (54% to 70%, 16% improvement, 95% CI 5 to 26, p = 0.004). Removing patients who were at lower risk of VTE from the analysis made no difference to the significance of the result (47% to 63%, 16% improvement, 95% CI 3 to 27, p = 0.01).
VTE is a major health and financial burden on the community . Unfortunately, despite the availability of evidence-based guidelines, VTE prophylaxis is still frequently underutilised. Our study found that at baseline only 54% of medical patients were receiving evidence-based VTE prophylaxis. This confirms the evidence-practice gap described in the international literature [10–13]. Numerous strategies to improve VTE prevention in hospitalised patients have been studied but none have been successful at addressing all the barriers to the provision of evidence-based care [15–19].
The barriers to the provision of appropriate medical patient prophylaxis have been documented in a number [27, 28] of recent studies. Known barriers include a lack of awareness of the importance of VTE prophylaxis and of the presence of evidence-based guidelines; a lack of knowledge on the indications for VTE prophylaxis and on appropriate prophylaxis options; and a lack of agreement and acceptance of current evidence-based recommendations [27, 28]. EOVs acknowledge and address each participant’s barriers to change with the aim of facilitating increased compliance with evidence-based practice . Few studies have examined the clinical impact of this intervention on the provision of VTE prophylaxis to medical patients and no previous studies have reported on its acceptability or utility.
Our results strongly suggest that EOVs are an acceptable implementation strategy for doctors working in the acute care setting. Nineteen (73%) of the 26 doctors eligible to participate agreed to receive an EOV. This was a greater than expected uptake given the established difficulty in providing hospital delivered education to senior doctors who, in the Australian private system, are consultant practitioners and not employees of the hospital . It was also encouraging to find that following the intervention 71% (n = 12) of participants who provided feedback reported that they would participate in another EOV in the future.
By reporting descriptive data on the practical application and utility of the intervention we hope to provide valuable information for anyone wishing to use this intervention in an acute care hospital setting. Of particular note was the considerable time (92 minutes) required to organise, prepare and deliver each EOV. This study is one of a very few published studies to report the total time required for each EOV and the only study set in an acute care hospital setting.
Of the 19 participants who received the intervention 79% (n = 15) gave a verbal agreement to provide evidence-based VTE prophylaxis to their medical patients. Importantly, this commitment translated into a 16% (95% CI 5 to 26, p = 0.004) improvement in prophylaxis rates above baseline. This clinical impact is much larger than that reported in a Cochrane systematic review on the effectiveness of EOVs . The review found that the median adjusted risk difference in compliance with prescribing practices was only 4.8% (IQ range 3.0% to 6.5%). The findings are similar, however, to two previous studies which used EOVs to improve doctors’ compliance with evidence-based VTE prevention practices in the acute care hospital setting. Roberts and Adams  observed a 14.2% (52.8% to 67%, p = 0.004) improvement in prophylaxis rates in medical patients while Grupper et al.  reported a 21% (29% to 50%, p < 0.001) improvement in a surgical population.
A limitation of our study was the use of a before-and-after design which may be subject to methodological limitations. There is some evidence to suggest that uncontrolled before and after studies over-estimate the effect of interventions . Having only one post-implementation data point collected three months after the intervention means that we cannot know if the observed improvement in practice will be sustained or improved upon over time. The hospital plans to monitor the sustainability of the improvement as part of the hospitals ongoing quality systems. Future research is recommended that examines the clinical impact of EOVs on VTE prophylaxis using a cluster randomised controlled trial which includes an evaluation of the ongoing sustainability of the intervention.
This study confirms that EOVs are effective at improving doctors’ provision of pharmacological VTE prophylaxis to hospitalised medical patients. In addition, it provides evidence of the acceptability of the intervention as an implementation strategy in the acute care setting, as well as valuable data on the practical application and utility of EOVs for those wishing to use this intervention in the future.
Deep vein thrombosis
Educational outreach visit.
The authors wish to acknowledge the financial support of the St Vincent Clinic Foundation and thank them for their ongoing patronage of multidisciplinary research on the St Vincent’s campus. The St Vincent’s Clinic Foundation had no role in the design; in the collection, analysis, and interpretation of data; in the writing of the manuscript; or the decision to submit the manuscript for publication.
- Heit JA, O’Fallon WM, Petterson TM, Lohse CM, Silverstein MD, Mohr DN, Melton LJ: Relative impact of risk factors for deep vein thrombosis and pulmonary embolism: A population-based study. Arch Intern Med. 2002, 162 (11): 1245.View ArticlePubMedGoogle Scholar
- Dobesh PP: Economic burden of venous thromboembolism in hospitalized patients. Pharmacotherapy. 2009, 29 (8): 943-953.View ArticlePubMedGoogle Scholar
- Economics A: The burden of venous thromboembolism in Australia, report for the Australia and New Zealand working party on the management and prevention of venous thromboembolism. 2008, Sydney: Access EconomicsGoogle Scholar
- Alikhan R, Peters F, Wilmott R, Cohen A: Fatal pulmonary embolism in hospitalised patients: a necropsy review. J Clin Pathol. 2004, 57 (12): 1254.View ArticlePubMedPubMed CentralGoogle Scholar
- Kahn SR, Lim W, Dunn AS, Cushman M, Dentali F, Akl EA, Cook DJ, Balekian AA, Klein RC, Le H, et al: Prevention of VTE in nonsurgical patients: American college of chest physicians evidence-based clinical practice guidelines. Chest. 2012, 141 (2_suppl): e195S-e226S.View ArticlePubMedPubMed CentralGoogle Scholar
- The Australian and New Zealand Working Party on the Management and Prevention of Venous Thromboembolism: Prevention of venous thromboembolism: best practice guidelines for Australia and New Zealand (5th ed). 2010, Sydney: Health Education and Management InnovationsGoogle Scholar
- Caprini J, Hyers T: Compliance with antithrombotic guidelines. Manag Care. 2006, 15 (9): 49-50.PubMedGoogle Scholar
- Cohen A, Alikhan R, Arcelus J: A risk assessment model for identifying medical patients who should receive thromboprophylaxis. J Thromb Haemost. 2003, 1 (Supp): OC437.Google Scholar
- Kucher N, Koo S, Quiroz R: Electronic alerts to prevent venous thromboembolism among hospitalized patients. J Vasc Surg. 2005, 42 (1): 178.View ArticleGoogle Scholar
- Amin A, Spyropoulos A, Dobesh P, Shorr A, Hussein M, Mozaffari E, Benner J: Are hospitals delivering appropriate VTE prevention? the venous thromboembolism study to assess the rate of thromboprophylaxis (VTE start). J Thromb Thrombolysis. 2010, 29 (3): 326-339.View ArticlePubMedGoogle Scholar
- Rothberg MB, Lahti M, Pekow PS, Lindenauer PK: Venous thromboembolism prophylaxis among medical patients at US hospitals. J Gen Intern Med. 2010, 25 (6): 489-494.View ArticlePubMedPubMed CentralGoogle Scholar
- Bergmann JF, Cohen AT, Tapson VF, Goldhaber SZ, Kakkar AK, Deslandes B, Huang W, Anderson FA: Venous thromboembolism risk and prophylaxis in hospitalised medically ill patients. The ENDORSE global survey. Throbosis and Haemostasis. 2010, 103 (4): 736-748.View ArticleGoogle Scholar
- Tapson VF, Decousus H, Pini M, Chong BH, Froehlich JB, Monreal M, Spyropoulos AC, Merli GJ, Zotz RB, Bergmann JF: Venous thromboembolism prophylaxis in acutely Ill hospitalized medical patients. Chest. 2007, 132 (3): 936-945.View ArticlePubMedGoogle Scholar
- Geerts W, Bergqvist D, Pineo G, Heit J, Samama C, Lassen M, Colwell C, P ACoC: Prevention of venous thromboembolism: American college of chest physicians evidence-based clinical practice guidelines (8th edition). Chest. 2008, 133 (6 Suppl): 381S-453S.View ArticlePubMedGoogle Scholar
- Tooher R, Middleton P, Pham C, Fitridge R, Rowe S, Babidge W, Maddern G: A systematic review of strategies to improve prophylaxis for venous thromboembolism in hospitals. Ann Surg. 2005, 241 (3): 397-415.View ArticlePubMedPubMed CentralGoogle Scholar
- Amin AN, Deitelzweig SB: Optimizing the prevention of venous thromboembolism: recent quality initiatives and strategies to drive improvement. Joint Comm J Qual Patient Saf. 2009, 35 (11): 558-564.Google Scholar
- Merli G: Improving venous thromboembolism performance: a comprehensive guide for physicians and hospitalists. Hosp Pract. 2010, 38 (3): 7-16.View ArticleGoogle Scholar
- Kakkar A, Davidson B, Haas S: Compliance with recommended prophylaxis for venous thromboembolism: Improving the use and rate of uptake of clinical practice guidelines. J Thromb Haemost. 2004, 2 (2): 221-227.View ArticlePubMedGoogle Scholar
- Michota FA: Bridging the gap between evidence and practice in venous thromboembolism prophylaxis: The quality improvement process. J Gen Intern Med. 2007, 22 (12): 1762-1770.View ArticlePubMedPubMed CentralGoogle Scholar
- Soumerai S, Avorn J: Principles of educational outreach (‘academic detailing’) to improve clinical decision making. JAMA. 1990, 263 (4): 549-556.View ArticlePubMedGoogle Scholar
- O’Brien M, Rogers S, Jamtvedt G, Oxman A, Odgaard-Jensen J, Kristoffersen D, Forsetlund L, Bainbridge D, Freemantle N, Davis D: Educational outreach visits: effects on professional practice and health care outcomes. Cochrane Database Syst Rev. 2007, 4: 1-79.Google Scholar
- Morris ZS, Clarkson PJ: Does social marketing provide a framework for changing healthcare practice?. Health Policy. 2009, 91 (2): 135-141.View ArticlePubMedGoogle Scholar
- Opel DJ, Diekema DS, Lee NR, Marcuse EK: Social marketing as a strategy to increase immunization rates. Arch Pediatr Adolesc Med. 2009, 163 (5): 432-437.View ArticlePubMedGoogle Scholar
- Cialdini RB: Harnessing the science of persuasion. (Cover story). Harv Bus Rev. 2001, 79 (9): 72-79.Google Scholar
- Roberts G, Adams R: Impact of introducing anticoagulation-related prescribing guidelines in a hospital setting using academic detailing. Ther Clin Risk Manag. 2006, 2 (3): 309-316.View ArticlePubMedPubMed CentralGoogle Scholar
- Grupper A, Rudin D, Drenger B, Varon D, Gilon D, Gielchinsky Y, Menashe M, Mintz Y, Rivkind A, Brezis M: Prevention of perioperative venous thromboembolism and coronary events: Differential responsiveness to an intervention program to improve guidelines adherence. International J Qual Health Care. 2006, 18 (2): 123-126.View ArticleGoogle Scholar
- Vardi M, Dagna L, Haran M, Duckit R: Attitudes towards and practice of venous thromboembolism prevention in general internal medicine wards: a multinational survey from member countries of the European federation of internal medicine. Thrombosis research. 2011, 129 (5): 573-576.View ArticlePubMedGoogle Scholar
- Lloyd NS, Douketis JD, Cheng J, Schünemann HJ, Cook DJ, Thabane L, Pai M, Spencer FA, Haynes RB: Barriers and potential solutions toward optimal prophylaxis against deep vein thrombosis for hospitalized medical patients: a survey of healthcare professionals. J Hosp Med. 2012, 7 (1): 28-34.View ArticlePubMedGoogle Scholar
- Koczwara B, Barton MB, Tattersall MH, Turner DR, Olver IN, Starmer DL: Medical education in Australia: changes are needed. Med J Aust. 2006, 3 (185): 1.Google Scholar
- Grimshaw J, Campbell M, Eccles M, Steen N: Experimental and quasi-experimental designs for evaluating guideline implementation strategies. Fam Pract. 2000, 17 (90001): 11-16.View ArticleGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1472-6963/13/398/prepub
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