A new anti-embolism stocking. Use of below-knee products and compliance

Compression stockings in addition to low-molecular-weight heparin to prevent venous thromboembolism in surgical inpatients requiring pharmacoprophylaxis: the GAPS non-inferiority RCT

BACKGROUND

Patients admitted to hospital for surgery are at an increased risk of venous thromboembolism. Pharmaco-thromboprophylaxis and mechanical prophylaxis (usually graduated compression stockings or intermittent pneumatic compression) have been shown to reduce the incidence of venous thromboembolism. The evidence base supporting the National Institute for Health and Care Excellence's recommendation for the use of graduated compression stockings for venous thromboembolism prevention in the UK has recently been challenged. It is unclear if the risks and costs associated with graduated compression stockings are justified for deep-vein thrombosis prevention in moderate- and high-risk elective surgical inpatients receiving low-dose low-molecular-weight heparin pharmaco-thromboprophylaxis.

OBJECTIVES

The primary objective was to compare the venous thromboembolism rate in elective surgical inpatients at moderate or high risk of venous thromboembolism who were receiving either graduated compression stockings and low-dose low-molecular-weight heparin (standard care) or low-dose low-molecular-weight heparin alone (intervention).

DESIGN

This was a pragmatic, multicentre, prospective, non-inferiority, randomised controlled trial.

SETTING

This took place in secondary care NHS hospitals in the UK.

PARTICIPANTS

Patients aged ≥ 18 years who were assessed to be at moderate or high risk of venous thromboembolism according to the NHS England venous thromboembolism risk assessment tool (or the trust equivalent based on this form) and who were not contraindicated to low-molecular-weight heparin or graduated compression stockings were deemed eligible to take part.

INTERVENTIONS

Participants were randomised 1 : 1 to either low-molecular-weight heparin or low-molecular-weight heparin and graduated compression stockings.

MAIN OUTCOME MEASURES

The primary outcome measure was venous thromboembolism up to 90 days after surgery. A combined end point of duplex ultrasound-proven new lower-limb deep-vein thrombosis (symptomatic or asymptomatic) plus imaging-confirmed symptomatic pulmonary embolism. Secondary outcomes included quality of life, compliance with graduated compression stockings and low-molecular-weight heparin during admission, and all-cause mortality.

RESULTS

A total of 1905 participants were randomised and 1858 were included in the intention-to-treat analysis. A primary outcome event occurred in 16 out of 937 (1.7%) patients in the low-molecular-weight heparin-alone arm compared with 13 out of 921 (1.4%) patients in the low-molecular-weight heparin plus graduated compression stockings arm. The risk difference between low-molecular-weight heparin and low-molecular-weight heparin plus graduated compression stockings was 0.30% (95% confidence interval -0.65% to 1.26%). As the 95% confidence interval did not cross the non-inferiority margin of 3.5% (p < 0.001 for non-inferiority), the results indicate that non-inferiority of low-molecular-weight heparin alone was shown.

LIMITATIONS

In total, 13% of patients did not receive a duplex ultrasound scan that could have detected further asymptomatic deep-vein thrombosis. However, missing scans were balanced between both trial arms. The subpopulation of those aged ≥ 65 years assessed as being at a moderate risk of venous thromboembolism was under-represented in the study; however, this reflects that this group is under-represented in the general population.

CONCLUSIONS

For elective surgical patients at moderate or high risk of venous thromboembolism, administration of pharmaco-thromboprophylaxis alone is non-inferior to a combination of pharmaco-thromboprophylaxis and graduated compression stockings. These findings indicate that graduated compression stockings may be unnecessary for most elective surgical patients.

FUTURE WORK

Further studies are required to evaluate whether or not adjuvant graduated compression stockings have a role in patients receiving extended thromboprophylaxis, beyond the period of hospital admission, following elective surgery or in patients undergoing emergency surgical procedures.

TRIAL REGISTRATION

Current Controlled Trials ISRCTN13911492.

FUNDING

This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 24, No. 69. See the NIHR Journals Library website for further project information.

Systematic review of patient preference and adherence to the correct use of graduated compression stockings to prevent deep vein thrombosis in surgical patients

AIM

The aim of this study was to explore patient preference and adherence to thigh and knee length graduated compression stockings for the prevention of deep vein thrombosis in surgical patients.

BACKGROUND

Hospitalised patients are at risk of developing deep vein thrombosis. Mechanical methods of prophylaxis include compression stockings, available as knee or thigh length. Patient adherence to correct stocking use is of critical importance to their effectiveness.

DESIGN

Systematic review of quantitative evidence.

DATA SOURCES

Eleven databases were searched from inception to 2013 for systematic reviews of compression stockings. Reviews were screened for relevant primary studies and update searches of eight electronic sources were undertaken (2010-2014).

REVIEW METHODS

Randomised controlled trials and observational studies of surgical patients using compression stockings were quality assessed and data were extracted on patient adherence and preference. A narrative summary is presented.

RESULTS

Nine randomised controlled trials and seven observational studies were included in the systematic review. There was substantial variation between studies in terms of patient characteristics, interventions and methods of outcome assessment.

CONCLUSION

Patient adherence was generally higher with knee length than thigh length stockings. However, the studies reflect patient adherence in a hospital setting only, where patients are observed by healthcare professionals; it is likely that adherence reduces once patients have been discharged from hospital. Patients preferred knee length stockings over thigh length stockings. In many clinical settings, any difference in efficacy between thigh length and knee length stockings may be rendered irrelevant by patient preference for and likely better adherence to knee length stockings.

Use and wear of anti-embolism stockings: a clinical audit of surgical patients

The objective of this study was to determine if anti-embolism stockings are fitted and worn according to evidence-based guidelines in surgical patients. The methodology is that an observational study was undertaken during January and February, 2010. An audit tool was constructed for the recording of information on a variety of parameters relating to the correct fitting and wearing of anti-embolism stockings. The results show that eighty surgical patients were audited with a mean age of 66 years. Of these, 72.5% were ambulatory; 38.75% of patients had incorrect presentation of their stockings; 29% were fitted with the incorrect size for limb measurement and 70% of patients reported not receiving any information regarding the reason for anti-embolism stocking use. Written information was not received by 100% of participants. For 82.5% of participants deep vein thrombosis (DVT) risk was not recorded. The garment size fitted (and/or limb measurement) was not recorded for 100% of patients. Daily routine skin inspection was noted for 29%. The findings of this study showed that anti-embolism stockings were not fitted and worn according to evidence-based guidelines. The author recommends a new recording tool be developed to ensure consistency of assessment and documentation regarding risk assessment, contraindications identification, and education and monitoring of patients wearing anti-embolism stockings.