Venous Thromboembolism Prophylaxis for the General Surgical Patient: Where Do We Stand?

Conservative vs Surgical Treatment of Impacted Femoral Neck Fracture in Patients 75 Years and Older

OBJECTIVE

To evaluate the safety and effectiveness of conservative treatment (CST), internal fixation (IF), and hemiarthroplasty (HA) in treating patients older than 75 years with impacted femoral neck fracture (IFNF).

DESIGN

A randomized clinical trial to compare clinical outcomes of CST, IF, and HA in IFNF patients older than 75 years with a 1:1:1 ratio.

SETTING

Nanjing First Hospital, Nanjing Medical University, Nanjing, China.

PARTICIPANTS

A total of 154 patients with IFNF aged between 75 and 97 years.

INTERVENTION

Patients with IFNF were allocated to CST, IF, and HA. They all received a 36-month follow-up.

MEASUREMENTS

All patients were evaluated by Harris hip score (HHS) (primary outcome) for hip function, European Quality of Life-5 Dimensions (EQ-5D) index scores for health-related quality of life, and visual analogue scale score for hip pain. Operation duration, blood loss, mortality, union rate, complications, and reoperation were also recorded. Assessors were blind to the type of treatment.

RESULTS

The baseline parameters of the three groups were similar. IF group had much lower blood loss than HA group (P < .05), while no significant difference in operative duration was found between the two groups (P > .05). HHS in HA group was significantly higher at 1, 3, and 6 months (P < .05), but no significant difference in HHS was found between CST and IF groups at any of the time points during the overall follow-up (P > .05). EQ-5D index score was higher in HA group at each follow-up within 1 year (P < .05), but the difference was not significant at 2- and 3-year follow-up (P > .05). There was no significant difference in mortality among the three groups at each follow-up point (P > .05). The nonunion rate was 11.76% (6/51) in CST group and 9.80% (5/51) in IF group and showed no significant difference (P > .05).

CONCLUSION

CST may be a feasible way for IFNF in the older patients.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT04219943. J Am Geriatr Soc 68:2214-2221, 2020.

Determination of Risk Factors for Venous Thromboembolism by an Adapted Caprini Scoring System in Surgical Patients

Venous thromboembolism (VTE) is a frequent preventable complication among surgical patients. Precise risk assessment is a necessary step for providing appropriate thromboprophylaxis and reducing mortality as well as morbidity caused by VTE. We carried out this work to define the rate of VTE postoperatively, following a Caprini score, and to determine VTE risk factors through a modified Caprini risk scoring system. This multicenter, observational, cohort study involved 2,790,027 patients who underwent surgery in four Vietnamese hospitals from 01/2017 to 12/2018. All patients who were evaluated before surgery by using a Caprini risk assessment model (RAM) and monitored within 90 days after surgery. The endpoint of the study was ultrasound-confirmed VTE. Our data showed that the 90-day postoperative VTE was found in 3068 patients. Most of VTE (46.97%) cases were found in the highest risk group (Caprini score > 5). A total of 37.19% were observed in the high risk group, while the rest (15.84%) were from low to moderate risk groups. The likelihood of occurring VTE was heightened 2.83 times for patients with a Caprini score of 3–4, 4.83 times for a Caprini score of 5–6, 8.84 times for a score of 7–8, and 11.42 times for a score of >8, comparing to ones with a score of 0 to 2 (all p values < 0.05). Thus, the frequency of postoperative VTE rises substantially, according to the advanced Caprini score. Further categorizing patients among the highest risk group need delivering more appropriate thromboprophylaxis.

Effective prevention of thromboembolic complications in emergency surgery patients using a quality improvement approach

OBJECTIVE

To assess the effectiveness of a multifaceted intervention based on industrial process improvement to identify and sustainably correct deficiencies in thromboprophylaxis delivery.

SUMMARY BACKGROUND DATA

Deep vein thrombosis and pulmonary embolism are major causes of morbidity and mortality in surgical patients, but effective prophylactic treatments are available. Ensuring reliable delivery of the intended thromboprophylaxis is, however, a long-standing problem.

METHODS

Delivery of thromboprophylactic treatment on an emergency general surgery admissions ward was targeted during a multidisciplinary intervention to improve process reliability using industrial quality improvement approaches. Delivery was audited against guidelines before and after 3- month intervention. Clinical outcome was evaluated by reviewing all radiological investigations for suspected Deep Vein Thrombosis (DVT) or Pulmonary Embolism (PE) from patients admitted to the unit in the 1 year immediately before and that immediately after intervention.

RESULTS

Delivery of thromboprophylaxis according to guidelines was improved from 35% before to 87% 3 months after intervention (χ(2)=87.412, p<0.0001) and sustained at 86% 10 months after intervention. Radiologically identified thromboembolic events occurring up to 60 days after admission in patients admitted for over 48 h fell from 23/3075 (0.75%) before to 9/3080 (0.29%) after intervention (HR 0.39, CI 0.29 to 0.53, χ(2)=6.18, p=0.01292). The risk of thromboembolism in the two groups diverged during follow-up to 60 days, before converging again.

CONCLUSIONS

A quality improvement process resulted in major sustainable improvements in the delivery of thromboprophylaxis associated with a 61% reduction in radiologically detected clinical episodes of thromboembolism 2 months after admission. Further study of this approach to improving care quality is warranted.

Effectiveness of instituting a specific bed protocol in reducing complications associated with bed rest

Pressure ulceration, deep venous thromboembolism, and hospital-acquired pneumonia are well-known complications of bed rest. This retrospective, single-center, observational cohort study evaluated the effectiveness of instituting bed rest protocol that included specific positioning, continuous heel off-loading, recumbent upper and lower body bed exercises, scheduled incentive spirometry, frequent position changes, and thromboprophylaxis (chemical, mechanical, or both), in reducing the incidence of pressure ulceration, deep venous thromboembolism, and hospital-acquired pneumonia in consecutive patients admitted for at least 7 days. A total of 29 patients (24 males, 5 females) were included in this study, with a mean age of 62.5 (median 63, range 17 to 84) years. The mean length of bed rest was 13.1 (median 10, range 7 to 31) days; and, the mean length of hospital stay was 21.1 (median 17, range 8 to 72) days. During hospitalization, 2 (6.9%) patients developed one or more of the complications measured, with 1 developing a posterior heel pressure ulcer that resolved with local care and another who developed deep venous thrombosis without pulmonary embolism, managed with therapeutic anticoagulation, and hospital-acquired pneumonia treated with antibiotic therapy. The results of this analysis were favorable in comparison with previously reported incidence rates for pressure ulcer, deep venous thrombosis, and hospital-acquired pulmonary complications in patients with similar risk factors, and suggested that a prescribed bed protocol reduces complications associated with bed rest.

A validation study of a retrospective venous thromboembolism risk scoring method

OBJECTIVES

Validate a retrospective venous thromboembolism (VTE) risk scoring method, which was developed at the University of Michigan Health System and based on the Caprini risk assessment model, and assess the confounding effects of VTE prophylaxis.

BACKGROUND

Assessing patients for risk of VTE is essential to initiating appropriate prophylaxis and reducing the mortality and morbidity associated with deep vein thrombosis and pulmonary embolism.

METHODS

VTE risk factors were identified for 8216 inpatients from the National Surgical Quality Improvement Program using the retrospective scoring method. Logistic regression was used to calculate odds ratios (OR) for VTE within 30 days after surgery for risk factors and risk level. A bivariate probit model estimated the effects of risk while controlling for adherence to prophylaxis guidelines.

RESULTS

Distribution of the study population by risk level was highest, 52.1%; high, 36.5%; moderate, 10.4%; and low, 0.9%. Incidence of VTE within 30 days was overall 1.4%; by risk level: highest, 1.94%; high, 0.97%; moderate, 0.70%; low, 0%. Controlling for length of hospitalization (>2 d) and fiscal year, pregnancy or postpartum (OR = 8.3; 1.0-68, P < 0.05), recent sepsis (4.0; 1.4-10.9, P < 0.01), malignancy (2.3; 1.5-3.3, P < 0.01), history of VTE (2.1; 1.1-4.1, P < 0.05), and central venous access (1.8; 1.1-3.0, P < 0.05) were significantly associated with VTE. Risk level was significantly associated with VTE (1.9; 1.3-2.6, P < 0.01). The bivariate probit demonstrated significant correlation between the probability of VTE and lack of adherence to prophylaxis guidelines (rho = 0.299, P = 0.013).

CONCLUSION

The retrospective risk scoring method is valid and supports use of individual patient assessment of risk for VTE within 30 days after surgery.