Effectiveness of clinical guidelines for deep vein thrombosis prophylaxis in reducing the incidence of venous thromboembolism in critically ill children after trauma

Screening and Prophylaxis for Venous Thromboembolism in Pediatric Surgery: A Systematic Review

OBJECTIVE

The American Pediatric Surgical Association Outcomes and Evidence-Based Practice Committee conducted a systematic review to describe the epidemiology of venous thromboembolism (VTE) in pediatric surgical and trauma patients and develop recommendations for screening and prophylaxis.

METHODS

The Medline (Ovid), Embase, Cochrane, and Web of Science databases were queried from January 2000 through December 2021. Search terms addressed the following topics: incidence, ultrasound screening, and mechanical and pharmacologic prophylaxis. The Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines were followed. Consensus recommendations were derived based on the best available literature.

RESULTS

One hundred twenty-four studies were included. The incidence of VTE in pediatric surgical populations is 0.29% (Range = 0.1%-0.48%) and directly correlates with surgery type, transfusion, prolonged anesthesia, malignancy, congenital heart disease, inflammatory bowel disease, infection, and female sex. The incidence of VTE in pediatric trauma populations is 0.25% (Range = 0.1%-0.8%) and directly correlates with injury severity, major surgery, central line placement, body mass index, spinal cord injury, and length-of-stay. Routine ultrasound screening for VTE is not recommended. Consider sequential compression devices in at-risk nonmobile, pediatric surgical patients when an appropriate sized device is available. Consider mechanical prophylaxis alone or with pharmacologic prophylaxis in adolescents >15 y and post-pubertal children <15 y with injury severity scores >25. When utilizing pharmacologic prophylaxis, low molecular weight heparin is superior to unfractionated heparin.

CONCLUSIONS

While VTE remains an infrequent complication in children, consideration of mechanical and pharmacologic prophylaxis is appropriate in certain populations.

TYPE OF STUDY

Systematic Review of level 2-4 studies.

LEVEL OF EVIDENCE

Level 3-4.

Venous Thromboembolism Prophylaxis in High-Risk Pediatric Trauma Patients

Importance

The indications, safety, and efficacy of chemical venous thromboembolism prophylaxis (cVTE) in pediatric trauma patients remain unclear. A set of high-risk criteria to guide cVTE use was recently recommended; however, these criteria have not been evaluated prospectively.

Objective

To examine high-risk criteria and cVTE use in a prospective multi-institutional study of pediatric trauma patients.

Design, Setting, and Participants

This cohort study was completed between October 2019 and October 2022 in 8 free-standing pediatric hospitals designated as American College of Surgeons level I pediatric trauma centers. Participants were pediatric trauma patients younger than 18 years who met defined high-risk criteria on admission. It was hypothesized that cVTE would be safe and reduce the incidence of VTE.

Exposures

Receipt and timing of chemical VTE prophylaxis.

Main Outcomes and Measures

The primary outcome was overall VTE rate stratified by receipt and timing of cVTE. The secondary outcome was safety of cVTE as measured by bleeding or other complications from anticoagulation.

Results

Among 460 high-risk pediatric trauma patients, the median (IQR) age was 14.5 years (10.4-16.2 years); 313 patients (68%) were male and 147 female (32%). The median (IQR) Injury Severity Score (ISS) was 23 (16-30), and median (IQR) number of high-risk factors was 3 (2-4). A total of 251 (54.5%) patients received cVTE; 62 (13.5%) received cVTE within 24 hours of admission. Patients who received cVTE after 24 hours had more high-risk factors and higher ISS. The most common reason for delayed cVTE was central nervous system bleed (120 patients; 30.2%). There were 28 VTE events among 25 patients (5.4%). VTE occurred in 1 of 62 patients (1.6%) receiving cVTE within 24 hours, 13 of 189 patients (6.9%) receiving cVTE after 24 hours, and 11 of 209 (5.3%) who had no cVTE (P = .31). Increasing time between admission and cVTE initiation was significantly associated with VTE (odds ratio, 1.01; 95% CI, 1.00-1.01; P = .01). No bleeding complications were observed while patients received cVTE.

Conclusions and Relevance

In this prospective study, use of cVTE based on a set of high-risk criteria was safe and did not lead to bleeding complications. Delay to initiation of cVTE was significantly associated with development of VTE. Quality improvement in pediatric VTE prevention may center on timing of prophylaxis and barriers to implementation.

Incidence of venous thromboembolism in pediatric orthopedics: A systematic review

BACKGROUNDS

Children undergoing orthopedic procedures often present numerous risk factors for thromboembolism. A recent survey, conducted by the Pediatric Orthopaedic Society of North America (POSNA), indicates that pediatric orthopedic surgeons are unaware of venous thromboembolism (VTE) prevention protocols and feel that certain procedures should require thromboprophylaxis. The aim of this systematic review was to properly assess the incidence of VTE in pediatric orthopedics. By using a thorough and broad search of the literature, the incidence according to different subspecialties of pediatric orthopedics was evaluated.

METHODS

A systematic review on VTE in pediatric orthopedics was conducted. Four databases were searched for articles reporting these events. Three major search concepts: "pediatrics", "orthopedic surgery/trauma" and "VTE complications" were used and broken down in MeSH, EmTree and their free vocabulary synonyms for proper literature review. Two independent authors screened 8467 titles and abstracts. Seventy articles reporting VTE in children treated by orthopedic surgeons were selected for data extraction. We reported median incidences by orthopedic subtypes and by study characteristics with a semi-quantitative review model.

RESULTS

The 70 articles yielded a total of 845,010 participants. Spine articles (33/70) provided 25,2% of the children included in the review. Trauma studies (16/70) accounted for 47.5% of the participants. The overall VTE median incidence was 0.16% [95% CI: 0.0-1.01%]. Musculoskeletal infections had a noticeably higher median incidence of 3.5% [CI: 0.0-13.8%]. Small variations were seen for the other subtypes: trauma, spine and elective surgeries. Subgroups by article characteristics did not differ significantly either.

CONCLUSION

Thrombotic complications are rare events in pediatric orthopedics, but knowledge epidemiologic is important because its potential severity. In this review, VTE median incidence for all orthopedic subtypes was around 0.16% [CI: 0.0-1.01%]. According to subspecialty assessment, musculoskeletal infections were associated with greater risk of VTE occurrence.

LEVEL OF EVIDENCE

III - Systematic review.

Thrombosis incidence in major paediatric burns

BACKGROUND

Major burns are associated with multiple risk factors for thrombosis such as decreased mobilization and systemic inflammation. It is unclear if these factors are offset by the inherent lower thrombosis risk in the paediatric patient. As such there is no consensus on thromboprophylaxis for paediatric burns patients, in contrast to this being a mainstay of treatment in the adult population. This retrospective cohort study examines the incidence of, and risk factors for, thrombotic events in major paediatric burns with a view to establish guidelines for prevention.

METHOD

Review of major paediatric burns, defined as % total body surface area (%TBSA) ≥30%, at the Adelaide Women's and Children's Hospital (WCH) over a 16-year period. Coding data and the local burns database were used to identify participants with subsequent review of case files.

RESULTS

Of the cohort (n = 23), six cases (26%) were complicated by thrombotic events. These patients had the most extensive burns averaging 68.5% TBSA, longer PICU admissions and associated interventions. These data points were more than doubled in the cohort diagnosed with a thrombus. Of the six events, five were secondary to central venous catheters (CVC) and one deep venous thrombosis (DVT) to the left calf.

CONCLUSION

The incidence of thrombotic events in our study was significant albeit in a small population. There is a strong association between large %TBSA and thrombus, with clots mostly forming around CVCs. While further research is required, this study demonstrates screening and targeted thromboprophylaxis may be required for major paediatric burns.

Impact of institutional prophylaxis guidelines on rates of pediatric venous thromboembolism following trauma-A multicenter study from the pediatric trauma society research committee

BACKGROUND

A paucity of data exists with regard to the incidence, management, and outcomes of venous thromboembolism (VTE) in injured children. We sought to determine the impact of institutional chemoprophylaxis guidelines on VTE rates in a pediatric trauma population.

METHODS

A retrospective review of injured children (≤15 years) admitted between 2009 and 2018 at 10 pediatric trauma centers was performed. Data were gathered from institutional trauma registries and dedicated chart review. The institutions were surveyed as to whether they had chemoprophylaxis guidelines in place for high-risk pediatric trauma patients, and outcomes were compared based on the presence of guidelines using χ 2 analysis ( p < 0.05).

RESULTS

There were 45,202 patients evaluated during the study period. Three institutions (28,359 patients, 63%) had established chemoprophylaxis policies during the study period ("Guidelines"); the other seven centers (16,843 patients, 37%) had no such guidelines ("Standard"). There were significantly lower rates of VTE in the Guidelines group, but these patients also had significantly fewer risk factors. Among critically injured children with similar clinical presentations, there was no difference in VTE rate. Specifically within the Guidelines group, 30 children developed VTE. The majority (17/30) were actually not indicated for chemoprophylaxis based on institutional guidelines. Still, despite protocols only one VTE patient in the guidelines group who was indicated for intervention ended up receiving chemoprophylaxis prior to diagnosis. No consistent ultrasound screening protocol was in place at any institution during the study.

CONCLUSION

The presence of an institutional policy to guide chemoprophylaxis for injured children is associated with a decreased overall frequency of VTE, but this disappears when controlling for patient factors. However, the overall efficacy is impacted by a combination of deficits in guideline compliance and structure. Further prospective data are needed to help determine the ideal role for chemoprophylaxis and protocols in pediatric trauma.

LEVEL OF EVIDENCE

Therapeutic/Care Management; Level IV.

Thromboprophylaxis in pediatric patients with earthquake-related crush syndrome: a single centre experience

PURPOSE

Injuries increase the risk of venous thromboembolism (VTE). However, the literature on the management of anticoagulant therapy in pediatric patients with crush injury is limited. In this study, we aimed to share our experience about anticoagulant thromboprophylaxis in pediatric patients with earthquake-related crush syndrome.

METHODS

This study included patients who were evaluated for VTE risk after the Turkey-Syria earthquake in 2023. Since there is no specific pediatric guideline for the prevention of VTE in trauma patients, risk assessment for VTE and decision for thromboprophylaxis was made by adapting the guideline for the prevention of perioperative VTE in adolescent patients.

RESULTS

Forty-nine patients [25 males and 24 females] with earthquake-related crush syndrome had participated in the study. The median age of the patients was 13.5 (8.8-15.5) years. Seven patients (14.6%) who had no risk factors for thrombosis were considered to be at low risk and did not receive thromboprophylaxis. Thirteen patients (27.1%) with one risk factor for thrombosis were considered to be at moderate risk and 28 patients (58.3%) with two or more risk factors for thrombosis were considered to be at high risk. Moderate-risk patients (n = 8) and high-risk patients aged < 13 years (n = 11) received prophylactic enoxaparin if they could not be mobilized early, while all high-risk patients aged ≥ 13 years (n = 13) received prophylactic enoxaparin.

CONCLUSION

With the decision-making algorithm for thyromboprophylaxis we used, we observed a VTE rate of 2.1% in pediatric patients with earthquake-related crush syndrome.

Thromboprophylaxis for Coagulopathy Related to COVID-19 in Pediatrics: A Narrative Review

In addition to harming the respiratory system, COVID-19 can affect multiple organs. Children may develop a specific complication of COVID-19 called multisystem inflammatory syndrome in children (MIS-C) which could influence the vascular system of children and cause multiple coagulopathies in the body. Information on the use of thromboprophylaxis in this condition was collected via the review of various articles. In general, different factors in immune system responses can trigger the initiation of thrombotic events. Studies have shown that starting anticoagulant prophylaxis, which contributes to decreased thrombotic events, is dependent on the patient's condition and D-dimer levels. However, further studies on pediatric populations are needed to establish the role of anticoagulants in children with this condition.

Venous thromboembolic screening in pediatric trauma: A prospective cohort study of risk-stratified ultrasonography

BACKGROUND

This prospective observational cohort study evaluates risk-stratified venous thromboembolism (VTE) screening in injured children. While the reported incidence of VTE is 6% to 10% among critically injured children, there is no standard for screening. Venous thromboembolism may have long-term sequelae in children, including postthrombotic syndrome.

METHODS

Patients admitted to a level 1 pediatric trauma center were risk stratified for VTE using a validated prediction algorithm. Children at high risk (risk scores ≥523; i.e., ≥1% risk) received screening duplex ultrasonography. Children at moderate risk (risk scores 410-522; i.e., 0.3-0.99% risk) were screened as a comparison/control.

RESULTS

Three-hundred fifty-five children were consecutively risk stratified from October 2019 to May 2021. Forty-seven children received screening duplex ultrasounds: 21 from a high-risk cohort and 26 from a moderate-risk cohort. Four children were diagnosed with VTE in the high-risk cohort compared with seven in the moderate-risk cohort ( p = 0.53). Total incidence of VTE among screened children was 23.4% (11 of 47). Asymptomatic VTE accounted for 81.8% of all events (9 of 11). Fifty-four percent (6 of 11) of VTE were central venous catheter associated. Venous thromboembolism in surviving children resolved by 3 to 6 months with no symptoms of postthrombotic syndrome after 1 year. No cases of VTE were identified in unscreened children, yielding an institutional VTE incidence of 3.1% (11 of 355).

DISCUSSION

Risk-stratified screening demonstrates a significant incidence of asymptomatic VTE in injured children. These results may guide reevaluation of prediction algorithms developed from symptomatic VTE risk and longitudinal study of the sequelae of asymptomatic VTE.

LEVEL OF EVIDENCE

Prognostic and Epidemiological; Level III.

Prophylaxis of Venous Thromboembolism in Children: A Systematic Review

Venous thromboembolism (VTE) in children is a rare but serious event. Current guidance on pharmacological thromboprophylaxis in children is mostly based on adult studies and expert opinions. The aim of this systematic review was to examine under which conditions children (age ≤ 18 years) would benefit from pharmacological thromboprophylaxis with low molecular weight heparin or unfractionated heparin. Eligible studies included children, who did not receive pharmacological thromboprophylaxis as comparator, and VTE events were radiologically verified. MEDLINE and Embase were searched up to October 3, 2021. Ten studies were included presenting data for 976 children receiving pharmacological thromboprophylaxis. We divided the studies into three categories based on the population studied: children in the intensive care unit (n = 2), children with fractures and/or undergoing surgery (n = 5), and children with systemic disease (n = 3). A lower incidence of VTE was found when pharmacological thromboprophylaxis was used compared with no prophylaxis in children in intensive care unit with central venous catheter and mechanical ventilation (7/27 vs. 13/24), children in the intensive care unit admitted after trauma with a very high risk of VTE based on several risk factors (0/21 vs. 13/96), and children with acute lymphoblastic leukemia treated with L-asparaginase concomitant with steroid and presence of central venous catheter (0/82 vs. 8/121). Pharmacological thromboprophylaxis was not associated with an increased bleeding risk. In conclusion, pharmacological thromboprophylaxis in children is sparsely investigated. Only children with several risk factors for VTE are likely to benefit from pharmacological thromboprophylaxis.

Association of venous thromboembolism following pediatric traumatic spinal injuries with injury severity and longer hospital stays

OBJECTIVE

Venous thromboembolism (VTE) can cause significant morbidity and mortality in hospitalized patients, and may disproportionately occur in patients with limited mobility following spinal trauma. The authors aimed to characterize the epidemiology and clinical predictors of VTE in pediatric patients following traumatic spinal injuries (TSIs).

METHODS

The authors conducted a retrospective cohort analysis of children who experienced TSI, including spinal fractures and spinal cord injuries, encoded within the National Trauma Data Bank from 2011 to 2014.

RESULTS

Of the 22,752 pediatric patients with TSI, 192 (0.8%) experienced VTE during initial hospitalization. Proportionally, more patients in the VTE group (77%) than in the non-VTE group (68%) presented following a motor vehicle accident. Patients developing VTE had greater odds of presenting with moderate (adjusted odds ratio [aOR] 2.6, 95% confidence interval [CI] 1.4-4.8) or severe Glasgow Coma Scale scores (aOR 4.3, 95% CI 3.0-6.1), epidural hematoma (aOR 2.8, 95% CI 1.4-5.7), and concomitant abdominal (aOR 2.4, 95% CI 1.8-3.3) and/or lower extremity (aOR 1.5, 95% CI 1.1-2.0) injuries. They also had greater odds of being obese (aOR 2.9, 95% CI 1.6-5.5). Neither cervical, thoracic, nor lumbar spine injuries were significantly associated with VTE. However, involvement of more than one spinal level was predictive of VTE (aOR 1.3, 95% CI 1.0-1.7). Spinal cord injury at any level was also significantly associated with developing VTE (aOR 2.5, 95% CI 1.8-3.5). Patients with VTE stayed in the hospital an adjusted average of 19 days longer than non-VTE patients. They also had greater odds of discharge to a rehabilitative facility or home with rehabilitative services (aOR 2.6, 95% CI 1.8-3.6).

CONCLUSIONS

VTE occurs in a low percentage of hospitalized pediatric patients with TSI. Injury severity is broadly associated with increased odds of developing VTE; specific risk factors include concomitant injuries such as cranial epidural hematoma, spinal cord injury, and lower extremity injury. Patients with VTE also require hospital-based and rehabilitative care at greater rates than other patients with TSI.

Venous thromboembolic risk stratification in pediatric trauma: A Pediatric Trauma Society Research Committee multicenter analysis

BACKGROUND

Venous thromboembolism (VTE) in injured children is rare, but its consequences are significant. Several risk stratification algorithms for VTE in pediatric trauma exist with little consensus, and all are hindered in development by relying on registry data with known inaccuracies. We performed a multicenter review to evaluate trauma registry fidelity and confirm the effectiveness of one established algorithm across diverse centers.

METHODS

Local trauma registries at 10 institutions were queried for all patients younger than 18 years admitted between 2009 and 2018. Additional chart review was performed on all "VTE" cases and random non-VTE controls to assess registry errors. Corrected data were then applied to our prediction algorithm using 10 real-time variables (Glasgow Coma Scale, age, sex, intensive care unit admission, transfusion, central line placement, lower extremity/pelvic fracture, major surgery) to calculate VTE risk scores. Contingency table classifiers and the area under a receiver operator characteristic curve were calculated.

RESULTS

Registries identified 52,524 pediatric trauma patients with 99 episodes of VTE; however, chart review found that 13 cases were misclassified for a corrected total of 86 cases (0.16%). After correction, the algorithm still displayed strong performance in discriminating VTE-fated encounters (sensitivity, 69%; area under the receiver operating characteristic curve, 0.96). Furthermore, despite wide institutional variability in VTE rates (0.04-1.7%), the algorithm maintained a specificity of >91% and a negative predictive value of >99.7% across centers. Chart review also revealed that 54% (n = 45) of VTEs were directly associated with a central line, usually femoral (n = 34, p < 0.001 compared with upper extremity), and that prophylaxis rates were underreported in the registries by about 50%; still, only 19% of the VTE cases had been on prophylaxis before diagnosis.

CONCLUSION

The VTE prediction algorithm performed well when applied retrospectively across 10 diverse pediatric centers using corrected registry data. These findings can advance initiatives for VTE screening/prophylaxis guidance following pediatric trauma and warrant prospective study.

LEVEL OF EVIDENCE

Clinical decision rule evaluated in a single population, level III.

Venous thromboembolism prophylaxis after pediatric trauma

In recent years, there has been an increased focus on developing and validating venous thromboprophylaxis guidelines in the pediatric trauma population. We review the current literature regarding the incidence of and risk factors for venous thromboembolism (VTE) and the use of prophylaxis in the pediatric trauma population. Risk factors such as age, injury severity, central venous catheters, mental status, injury type, surgery, and comorbidities can lead to a higher incidence of VTE. Risk stratification tools have been developed to determine whether mechanical and/or pharmacologic prophylaxis should be implemented depending on the degree of VTE risk. When VTE risk is high, pharmacologic prophylaxis, such as with low molecular weight heparin, is often initiated. However, the timing and duration of VTE prophylaxis is dependent on patient factors including ambulatory status and contraindications such as bleeding. In addition, the utility of screening ultrasound for VTE surveillance has been evaluated and though they are not widely recommended, no formal guidelines exist. While more research has been done in recent years to assess the most appropriate type, timing, and duration of VTE prophylaxis, further studies are warranted to create optimal guidelines for decreasing the risk of VTE after pediatric trauma.

Venous Thromboembolism among Critically Ill Children: A Narrative Review

Venous thromboembolism (VTE) is a leading cause of morbidity and mortality among hospitalized patients, including children. In recent years, it has become clear that hospitalization and critical illness bestow an increased VTE risk in pediatrics and relate to mortality and life-limiting comorbidities. For critically ill children, reported rates of VTE vary by study sampling techniques, presence of inherited or acquired thrombophilia, acute and chronic immobility, underlying illness prompting hospitalization, and clinical factors related to illness severity such as central venous catheterization, length of stay, mechanical ventilation, and patient age. Accordingly, critically ill children with new signs of venous congestion, acute inflammation, or unexplained acute organ dysfunction should be routinely evaluated for VTE. This narrative review summarizes recent and historical literature regarding risk factors, prevention, presentation, treatment, and outcomes of VTE in critically ill children. In addition, we identify knowledge gaps and priorities for future collaborative research on this vital condition. Special attention is given to the clinical trial opportunities, challenges, and ongoing efforts in thromboprophylaxis in critically ill children, including those hospitalized for disease related to novel coronavirus (COVID-19) and multisystem inflammatory disease in children.

Optimizing pharmacologic thromboprophylaxis use in pediatric orthopedic surgical patients through implementation of a perioperative venous thromboembolism risk screening tool

BACKGROUND

Although rare, venous thromboembolic events (VTE) are a significant challenge in pediatric orthopedic surgical patients (POSP). A VTE thromboprophylaxis screening tool was developed and implemented in POSPs at the IWK Health Centre since October 2016.

OBJECTIVES

This retrospective cohort study was designed to evaluate and assess the impact of the VTE thromboprophylaxis screening tool in terms of use of thromboprophylaxis in POSP.

METHODS

Using the tool, POSPs were screened and were categorized into risk groups. Patient groups were compared and spearman correlation analysis was performed to show the strength of association between risk factors and thromboprophylaxis. Retrospective screening of pre-algorithm patients who received thromboprophylaxis was done to further assess the screening tool.

RESULTS

After the implementation of the VTE thromboprophylaxis screening tool in POSPs, there was a 47.9% reduction in the use of thromboprophylaxis (P = 0.046) as compared with before. Neither VTE nor significant bleeding complications occurred before or after screening tool implementation. Compliance with the screening tool was excellent (100% of patients in the high-risk category received thromboprophylaxis). High-risk patients were more likely to have body mass index  > 30 (35.7%), limited/altered mobility (57.1%), and to be undergoing a complicated/repeat surgery (64.3%).

CONCLUSIONS

The present study demonstrates successful implementation of a VTE thromboprophylaxis screening tool that resulted in significant reduction in use of thromboprophylaxis in POSPs with no increase in VTE or change in bleeding complications.

Significant practice variability exists in the prevention of venous thromboembolism in injured children: results from a joint survey of the Pediatric Trauma Society and the Trauma Center Association of America

BACKGROUND/PURPOSE

The purpose of this study was to characterize current practices to prevent venous thromboembolism (VTE) in children and measure adherence to recent joint consensus guidelines from the Pediatric Trauma Society and Eastern Association for the Surgery of Trauma (PTS/EAST).

METHODS

An 18-question survey was sent to the membership of PTS and the Trauma Center Association of American. Responses were compared with Chi-square test.

RESULTS

One hundred twenty-nine members completed the survey. Most respondents were from academic (84.5%), Level 1 pediatric (62.0%) trauma centers. Criteria for VTE prophylaxis varied between hospitals with freestanding pediatric trauma centers significantly more likely to stratify children by risk factors than adult trauma centers (p = 0.020). While awareness of PTS/EAST guidelines (58.7% overall) was not statistically different between hospital types (44% freestanding adult, 52% freestanding pediatric, 71% combined adult pediatric, p = 0.131), self-reported adherence to these guidelines was uniformly low at 37.2% for all respondents. Lastly, in three clinical scenarios, respondents chose VTE screening and prophylaxis plans in accordance with a prospective application of PTS/EAST guidelines 55.0% correctly.

CONCLUSION

Currently no consensus regarding the prevention of VTE in pediatric trauma exists. Prospective application of PTS/EAST guidelines has been limited, likely due to poor quality of evidence and a reliance on post-injury metrics. Results of this survey suggest that further investigation is needed to more clearly define the risk of VTE in children, evaluate, and prospectively validate alternative scoring systems for VTE prevention in injured children.

LEVEL OF EVIDENCE

N/A-Survey.

High-Energy Fractures of the Pelvis and Acetabulum in Pediatric Patients

Fractures of the pelvis and acetabulum, although uncommon in the pediatric cohort, represent a range of injuries with similarities to those seen in the adult cohort but with key differences that are important for the treating physician to be aware of to allow for systematic evaluation and management of these potentially life-threatening injuries. As the pediatric skeleton matures, changes in anatomy and physiology influence injury pattern, diagnosis, treatment, and complications. High-energy fractures of the pediatric pelvis are particularly concerning given the reported mortality rates ranging from 3.2% to 18%, with severe fracture patterns being associated with visceral injury in up to 60% of patients. The unique complexity of pediatric patients requires a multidisciplinary team to fully address their care. A systematic approach to the initial evaluation and diagnosis of pediatric patients with fractures of the acetabulum or pelvic ring aids in choosing between surgical and nonsurgical management of these fractures and avoiding complications unique to the maturing skeleton. We present such an approach to assist the practitioner who infrequently treats these uncommon injuries.

Epidemiology and outcomes of clinically unsuspected venous thromboembolism in children: A systematic review

BACKGROUND

Clinically unsuspected venous thromboembolic events (uVTE) detected during routine imaging pose a management challenge due to limited knowledge about their clinical significance. Unsuspected VTE are often referred as "asymptomatic," "incidental," or "clinically silent/occult" VTE.

OBJECTIVE

To understand the epidemiology, management, and outcomes of uVTE in children.

METHODS

A systematic review was performed according to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. The search criteria included controlled vocabulary and keywords for VTE, incidental findings, and children (ages ≤ 21 years).

RESULTS

Among 10 875 articles, 51 studies (8354 children with 758 uVTE) were selected. The studies were heterogeneous, I2 96%; P < .0001. Unsuspected VTE were diagnosed in two settings: first, asymptomatic VTE (aVTE) diagnosed through surveillance imaging for VTE (46 studies; n = 5894; aVTE: 715, pooled frequency: 19%, 95% confidence interval [CI]: 13%-24%); second, incidental VTE (iVTE) diagnosed during imaging performed for indications without primary suspicion for VTE (6 studies; n = 2460; iVTE: 43). The majority (94%) of aVTE were associated with central venous lines (CVL). Non-CVL settings included post-spinal surgery, post-splenectomy, trauma, nephrotic syndrome, and newborns. In general, aVTE were reported to have a benign clinical course, were mostly transient, and resolved without intervention and with few immediate or long-term functional complications. Incidental VTE were primarily detected in children with cancer and ranged from tumor-associated thrombi to pulmonary embolism (PE) with insufficient evidence to draw meaningful conclusions about their management.

CONCLUSION

Clinically uVTE were predominantly diagnosed with CVL and their outcomes were generally favorable implying limited benefit of routine surveillance and thromboprophylaxis. Prospective research is needed to clarify the optimal management of iVTE.

Venous thromboembolism in children undergoing surgery: incidence, risk factors and related adverse events

Background

Although less common in adults, venous thromboembolism (VTE) in children is a highly morbid, preventable adverse event. While VTE has been well studied among pediatric hospitalized and trauma patients, limited work has been done to examine postoperative VTE in children undergoing surgery.

Methods

Using data from National Surgical Quality Improvement Project Pediatric database (NSQIP-P) from 2012 to 2016, a retrospective cohort analysis was performed to determine the incidence of, and risk factors for, VTE in children undergoing surgery. Additionally, the relationships between VTE and other postoperative adverse outcomes were evaluated.

Results

Of 361 384 pediatric surgical patients, 378 (0.10%) were identified as experiencing postoperative VTE. After controlling for patient and surgical factors, we found that American Society of Anesthesiologists (ASA) class of II or greater, aged 16–18 years, non-elective surgery, general surgery (compared with several other surgical specialties), cardiothoracic surgery (compared with general surgery) and longer operative time were significantly associated with VTE in pediatric patients (p<0.001 for each comparison). Furthermore, a majority of adverse events were found to be associated with increased risk of subsequent VTE (p<0.001).

Conclusion

In a large pediatric surgical population, an incidence of postoperative VTE of 0.10% was observed. Defined patient and surgical factors, and perioperative adverse events were found to be associated with such VTE events.

Pediatric trauma venous thromboembolism prediction algorithm outperforms current anticoagulation prophylaxis guidelines: a pilot study

PURPOSE

Venous thromboembolism (VTE) in injured children is rare, but sequelae can be morbid and life-threatening. Recent trauma society guidelines suggesting that all children over 15 years old should receive thromboprophylaxis may result in overtreatment. We sought to evaluate the efficacy of a previously published VTE prediction algorithm and compare it to current recommendations.

METHODS

Two institutional trauma registries were queried for all pediatric (age < 18 years) patients admitted from 2007 to 2018. Clinical data were applied to the algorithm and the area under the receiver operating characteristic (AUROC) curve was calculated to test algorithm efficacy.

RESULTS

A retrospective review identified 8271 patients with 30 episodes of VTE (0.36%). The VTE prediction algorithm classified 51 (0.6%) as high risk (> 5% risk), 322 (3.9%) as moderate risk (1-5% risk) and 7898 (95.5%) as low risk (< 1% risk). AUROC was 0.93 (95% CI 0.89-0.97). In our population, prophylaxis of the 'moderate-' and 'high-risk' cohorts would outperform the sensitivity (60% vs. 53%) and specificity (96% vs. 77%) of current guidelines while anticoagulating substantially fewer patients (373 vs. 1935, p < 0.001).

CONCLUSION

A VTE prediction algorithm using clinical variables can identify injured children at risk for venous thromboembolic disease with more discrimination than current guidelines. Prospective studies are needed to investigate the validity of this model.

LEVEL OF EVIDENCE

III-Clinical decision rule evaluated in a single population.

Development of a perioperative venous thromboembolism prophylaxis algorithm for pediatric orthopedic surgical patients

Venous thromboembolism (VTE) has been recognized as a rare but potentially serious complication in pediatric orthopedic patients. However, standardized guidelines for screening and management of at-risk patients do not exist. The aim of the study was to develop a VTE prophylaxis screening tool for postoperative orthopedic patients after conducting an institutional needs assessment survey. A needs assessment survey was conducted after institutional ethics board approval. Development of perioperative VTE prophylaxis algorithm for pediatric orthopedic surgical patients was planned after thorough literature review, consultation with national and international experts as well as using a modified nominal and consensus development conference (serial meetings) method for reaching a consensus. NAS as well as discussion with stakeholders indicated support for development of perioperative VTE prophylaxis algorithm for orthopedic patients. Using above methods, a VTE prophylaxis algorithm was developed and implemented at IWK Health Center. The present study involved development of a perioperative VTE prophylaxis algorithm for pediatric orthopedic surgical patients that could be easily and rapidly administered as a point of care assessment tool.

Venous thromboembolism risk factors in a pediatric trauma population

PURPOSE

New guidelines have been proposed for venous thromboembolism (VTE) prophylaxis in pediatric trauma patients. This paper seeks to evaluate risk factors associated with VTE that might further guide patient selection for prophylaxis.

METHODS

Review of a tertiary children's academic hospital's trauma database for VTE events and associated risk factors from 2005 to 2016.

RESULTS

15,306 pediatric trauma patients were identified and reviewed. During this time period there were 6191 admissions (40.4%), of which 20 developed a VTE (0.3%) including two pulmonary emboli. Primary outcome was comparison of risk factors for developing a VTE that were identified in the literature. Age stratification revealed the highest incidence of VTE in children under the age of 2 (0.7%), which increased with CVC placement when compared to children aged 2-12 and 13-15 (0.036 Fisher's exact test).

CONCLUSIONS

VTE after pediatric trauma is rare, and may be more uncommon than previously reported. CVC placement was the strongest predictor of VTE, particularly in infant and toddler patients which can explain their higher overall incidence compared to other pediatric age groups. Identifying high-risk patients is important to optimize screening and prophylaxis of VTE in pediatric trauma patients while minimizing risks of anticoagulation.

Efficacy of surveillance ultrasound for venous thromboembolism diagnosis in critically ill children after trauma

INTRODUCTION

Venous thromboembolism (VTE) is increasingly prevalent in injured children admitted to the intensive care unit (ICU). Few data exist to support VTE pharmacologic prophylaxis or ultrasound (US) surveillance in children with high bleeding risk. After implementation of screening US guidelines, we sought to describe our experience, hypothesizing that screening US of children at highest risk for VTE results in earlier detection and management.

STUDY DESIGN

A retrospective analysis was conducted on prospectively collected data of injured children admitted to an American College of Surgeons Verified level 1 Pediatric Trauma Center from 2010 to 2015. In patients at high risk for both VTE and bleeding (HRHR), guidelines recommended deferral of pharmacologic prophylaxis and a screening US at ≥7 ICU days if bleeding risk remained. Outcomes analyzed included VTE rates, guideline compliance, and US timing. The rate of deep vein thrombosis (DVT) detection (number of DVT captured/number of US obtained) was examined.

RESULTS

Of 4061 trauma patients, 588 (14.5%) were critically injured including 112 patients who met HRHR criteria. The rate of VTE in the HRHR group ≥7 ICU days was 25% (14/56). Of 23 VTE diagnosed in the ICU, 17 were detected by 49 US performed (34.7%), with the remaining 6 diagnosed by computed tomography. DVT was detected earlier than the US guideline recommended 7 days, independent of symptoms. Guideline compliance was 86%.

CONCLUSION

Critically injured children at risk for bleeding frequently develop VTE. Surveillance ultrasound in patients at high risk for both VTE and bleeding allows earlier detection and treatment.

LEVEL OF EVIDENCE

Therapeutic study, level II.

Multicenter Review of Current Practices Associated With Venous Thromboembolism Prophylaxis in Pediatric Patients After Trauma

OBJECTIVES

Frequency of venous thromboembolism in pediatric trauma patients admitted to PICUs is not insignificant, ranging up to 6%. Risk factors have been identified in this population. However, there is little consensus of actual venous thromboembolism prophylaxis practice. We examined factors associated with venous thromboembolism prophylaxis in PICUs.

DESIGN

A retrospective study evaluating associations with mechanical venous thromboembolism prophylaxis, pharmacologic venous thromboembolism prophylaxis, or dual therapy (DUAL) prophylaxis compared with no venous thromboembolism prophylaxis. Multivariable logistic regression explored the relationship between prophylaxis type and selected covariates with stepwise selection method to identify the independent predictors of venous thromboembolism prophylaxis utilization.

SETTING

Five level I/II pediatric trauma centers in the United States.

PATIENTS

Children less than 18 years from January 1, 2013, to December 31, 2013, admitted to the PICU after a trauma, identified through combined trauma registry and Virtual Pediatric Systems database.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Six hundred ninety-two patients were included in the database, with 55 excluded for missing data. Of the remaining 637 patients, 538 (84.5%) had no venous thromboembolism prophylaxis by 48 hours, 77 (12.1%) had only mechanical venous thromboembolism prophylaxis, 11 (1.7%) had DUAL, and 11 (1.7%) had pharmacologic venous thromboembolism prophylaxis alone. Multivariable analysis showed increased age, and orthopedic procedure was associated with all forms of prophylaxis. Orthopedic procedures were associated with higher utilization of dual prophylaxis use (odds ratio, 5.2; 95% CI, 1.2-21.8), pharmacologic venous thromboembolism prophylaxis (odds ratio, 8.5; 95% CI, 2.3-31.7), and mechanical venous thromboembolism prophylaxis (odds ratio, 2.2; 95% CI, 1.1-4.2) alone. Brain/spinal cord procedures (odds ratio, 3.7; 95% CI, 1.9-7.3) and abdominal procedures (odds ratio, 6.6; 95% CI, 2.5-17.1) were associated with mechanical venous thromboembolism prophylaxis. Head injury was associated with a decreased use of any prophylaxis (odds ratio, 0.5; 95% CI, 0.3-0.9). Patient comorbidities were associated with decreased use of mechanical venous thromboembolism prophylaxis (odds ratio, 0.5; 95% CI, 0.3-1.0).

CONCLUSIONS

Pharmacologic venous thromboembolism prophylaxis is not common in critically ill children after trauma. Patient age, orthopedic and vascular procedures, and higher injury severity are associated with pharmacologic venous thromboembolism prophylaxis.

Pulmonary Embolism in Children

Pulmonary embolism (PE) in children is a rare condition with potential for high mortality. PE incidence is increasing owing to increased survival of children with predisposing conditions, increased use of central venous catheters, and improved awareness and recognition. Although pediatric PE is distinct from adult PE, management guidelines in children are extrapolated from the adult data. Treatment includes thrombolysis or thrombectomy, and pharmacologic anticoagulation. Ongoing clinical trials are evaluating the use of direct oral anticoagulants in children. Further research is required to develop pediatric-specific evidence-based guidelines for diagnosis and management of PE.

Establishment of prophylactic enoxaparin dosing recommendations to achieve targeted anti-factor Xa concentrations in children with CHD

BACKGROUND

Enoxaparin may be used to prevent central venous catheter-related thrombosis in patients with CHD. We aimed to determine whether current enoxaparin dosing regimens effectively achieve anti-factor Xa concentrations within prophylactic goal ranges in this patient population.

METHODS

We implemented a formal protocol aimed at reducing central venous catheter-related thrombosis in children with CHD in January, 2016. Standard empiric prophylactic enoxaparin dosing regimens were used - for example, 0.75 mg/kg/dose every 12 hours for patients <2 months of age and 0.5 mg/kg/dose every 12 hours for patients ⩾2 months of age - with anti-factor Xa goal range of 0.25-0.49 IU/ml. Patients <2 years of age who received enoxaparin and had at least one valid steady-state anti-factor Xa measurement between 25 January, 2016 and 31 August, 2016 were retrospectively reviewed.

RESULTS

During the study period, 47 patients had 186 anti-factor Xa concentrations measured, of which 20 (11%) were above and 112 (60%) were below the prophylactic goal range. Anti-factor Xa concentrations within the goal range were ultimately achieved in 31 patients. Median dose required to achieve anti-factor Xa concentrations within the prophylactic range was 0.89 mg/kg/dose (25, 75%: 0.75, 1.11) for patients <2 months (n=23 patients) and 0.79 mg/kg/dose (25, 75%: 0.62, 1.11) for patients ⩾2 months (n=8 patients).

CONCLUSIONS

Enoxaparin doses required to achieve prophylactic anti-factor Xa concentrations in young children with CHD were consistently higher than the currently recommended prophylactic dosing regimens. Further study is needed to determine whether dose titration to achieve prophylactic anti-factor Xa concentrations is effective in preventing central venous catheter-related thrombosis.

Deep vein thrombosis in pediatric patients

Due to advances in caring for critically ill children and those with chronic diseases, rates of deep vein thrombosis (DVT) are increasing in children. Risk factors consist of central venous catheters, chronic medical conditions, thrombophilia, and various medications. Compression Doppler ultrasonography is the method most commonly used to diagnose DVT, and patients will usually present with pain and swelling of the affected limb. Anticoagulation via subcutaneous injection is the most common treatment regime for children with DVT, and the new, direct oral anticoagulants are currently under investigation. Prevention techniques are not established, but clinical studies are addressing this need.

Variables associated with pulmonary thromboembolism in injured patients: A systematic review

BACKGROUND

Pulmonary thromboembolism (PTE) is a dangerous complication of traumatic injury, with varied risk profiles and treatment options. This review aims to describe reported incidence and variables associated with PTE among severely injured patients.

METHODS

Searches were conducted using PubMed, Cochrane and MEDLINE. Relevant studies were identified by two independent reviewers based on predetermined inclusion criteria. Incidence of PTE was the primary outcome measure. Variables associated with PTE was the secondary outcome measure. The Newcastle-Ottawa Scale was used to assess quality of included studies.

RESULTS

There were eight studies that satisfied inclusion criteria. The diagnosed incidence of PTE in these populations ranged from 0.35 to 24%. The most common variables associated with PTE were pelvic or lower limb injury, chest injury, higher total Injury Severity Score, male sex and age. Variables that were less commonly associated with PTE were previous warfarin use, head injury, high serum lactate, soft tissue injury, more than one operation, more than three days on a ventilator, presence of a subclavian central venous catheter, need for a blood transfusion, systolic blood pressure <90mmHg, abdominal injury, presence of a deep venous thrombosis, inferior vena cava filter placement and isolated liver spleen or spinal injuries.

CONCLUSIONS

The reported incidence of PTE after major trauma is variable and dependent on inclusion criteria, diagnostic criteria and study design. Identified variables differed to those reported for venous thromboembolism in other populations. It is difficult to predict populations at risk of clinically significant PTE following injury using available evidence. Further studies linked to patient-specific variables will assist in more precise risk-stratification and interventions.

Advances in predicting venous thromboembolism risk in children

Paediatric venous thromboembolism (VTE) is a rare disorder but a rising incidence has been observed in recent years, due to improved VTE diagnosis and increased use of central venous catheters in the treatment of severe diseases. Risk assessment strategies are well established for adult patients, however, similar guidelines for paediatric patients are largely lacking. Several risk prediction tools have been reported in recent literature, which make use of established risk factors to assess VTE risk in paediatric subgroups, such as hospitalised children, cancer-diagnosed children and paediatric trauma patients. Although these models suffer several limitations regarding their study size and heterogeneous selection of predictor variables, they offer potential for improving the thromboprophylaxis management in these children. Here, we give an overview on recently reported risk prediction models for paediatric VTE.

Quality Initiative to Introduce Pediatric Venous Thromboembolism Risk Assessment for Orthopedic and Surgery Patients

BACKGROUND AND OBJECTIVES

Pediatric hospital-acquired venous thromboembolism (VTE) is costly, has high morbidity, and is often preventable. The objective of this quality-improvement effort was to increase the percentage of general surgery and orthopedic patients ≥10 years of age screened for VTE risk from 0% to 80%.

METHODS

At a freestanding children's hospital, 2 teams worked to implement VTE risk screening for postoperative inpatients. The general surgery team used residents and nurse practitioners to perform screening whereas the orthopedic team initially used bedside nursing staff. Both groups employed multiple small tests of change. Shared key interventions included refinement of a screening tool, provider education, mitigation of failures, and embedding the risk assessment task into staff workflow. The primary outcome measure, the percentage of eligible patients with a completed VTE risk assessment, was plotted on run charts. Secondary outcome measures for screened patients included the level of risk, the use of appropriate prophylaxis, and VTE events.

RESULTS

Median weekly percentage of general surgery patients screened for VTE risk increased from 0% to 86% within 12 months, and median weekly percentage of orthopedic patients screened for VTE risk increased from 0% to 46% within 8 months. Among screened patients, the majority were at low or moderate risk for VTE and received prophylaxis in accordance with or beyond guideline recommendations. No screened patients developed VTE.

CONCLUSIONS

Quality-improvement methods were used to implement a VTE risk screening process for postoperative patients. Using providers as screeners, as opposed to bedside nurses, led to a greater percentage of patients screened.

Development of a Surveillance System for Pediatric Hospital-Acquired Venous Thromboembolism

BACKGROUND

Pediatric hospital-acquired (HA) venous thromboembolism (VTE) is a vexing problem with improvement efforts hampered by lack of robust surveillance methods to establish accurate rates of HA-VTE.

METHODS

At a freestanding children's hospital, a multidisciplinary team worked to develop a comprehensive surveillance strategy for HA-VTE. Starting with diagnosis codes, we implemented complementary detection methods, including clinical and radiology data, to develop a robust surveillance system. HA-VTE events were tracked by using descriptive statistics and a statistical process control chart. Detection methods were evaluated via retrospective application of each method to every identified HA-VTE. Initial detection method was tracked.

RESULTS

A total of 68 HA-VTE events were identified and the median number of events per 1000 patient days increased from 0.18 to 0.34. No single detection method would have identified all events. Each detection method initially identified HA-VTE events.

CONCLUSIONS

Implementation of multiple detection methods has optimized timely detection of HA-VTE. This allows the establishment of a reliable baseline rate, enabling quality improvement efforts to address HA-VTE.

Evaluation of guidelines for injured children at high risk for venous thromboembolism: A prospective observational study

BACKGROUND

Pharmacologic prophylaxis for venous thromboembolism (VTE) is a widely accepted practice in adult trauma patients to prevent associated morbidity and mortality. However, VTE prophylaxis has not been standardized in injured pediatric patients. Our institution identified factors potentially associated with a high risk of VTE in critically injured children that led to prospective implementation of VTE prophylaxis guidelines. We hypothesize that the guidelines are accurate in predicting children at risk for VTE.

METHODS

Data were prospectively collected on injured children from August 2010 to August 2015. Pharmacologic prophylaxis was indicated for patients identified by the guidelines as high risk for VTE. Prophylaxis was deferred and a screening ultrasound was performed if the high-risk VTE patients were also at high risk for bleeding. To assess the accuracy of predicting confirmed cases of VTE, stepwise logistic regression analysis was used to measure the association of individual risk factors with VTE controlling for age (≥13 years). A receiver operating characteristic curve measured the accuracy of the final model to predict a VTE.

RESULTS

Of 4,061 trauma patients, 588 were admitted to the ICU, with the guidelines identifying 199 as high risk for VTE. VTE occurred in 3.9% (23/588) of the ICU population and 10% (20/199) of the high risk group. The median age of VTE patients in the ICU was 9.7 years. Statistically significant predictors (p < 0.05) of VTE in the multivariate model included presence of a central venous catheter (OR = 5.2), inotropes (OR = 7.7), immobilization (OR = 5.5), and a Glasgow Coma Scale of <9 (OR = 1.3). The area under receiver operating characteristic curve of this model was 0.92, demonstrating its excellent predictive ability.

CONCLUSION

Specific clinical factors in critically injured children are associated with a high risk for VTE. Incorporating these risk factors in VTE prophylaxis guidelines facilitates more accurate risk stratification and may allow for improved VTE prevention in pediatric trauma.

LEVEL OF EVIDENCE

Prognostic study, level II.

Prophylaxis against venous thromboembolism in pediatric trauma: A practice management guideline from the Eastern Association for the Surgery of Trauma and the Pediatric Trauma Society

BACKGROUND

Despite the increasing incidence of venous thromboembolism (VTE) in hospitalized children, the risks and benefits of VTE prophylaxis, particularly for those hospitalized after trauma, are unclear. The Pediatric Trauma Society and the Eastern Association for the Surgery of Trauma convened a writing group to develop a practice management guideline on VTE prophylaxis for this cohort of children using the Grading of Recommendations Assessment, Development, and Evaluation framework.

METHODS

A systematic review of MEDLINE using PubMed from January 1946 to July 2015 was performed. The search retrieved English-language articles on VTE prophylaxis in children 0 to 21 years old with trauma. Topics of investigation included pharmacologic and mechanical VTE prophylaxis, active radiologic surveillance for VTE, and risk factors for VTE.

RESULTS

Forty-eight articles were identified and 14 were included in the development of the guideline. The quality of evidence was low to very low because of the observational study design and risks of bias.

CONCLUSIONS

In children hospitalized after trauma who are at low risk of bleeding, we conditionally recommend pharmacologic prophylaxis be considered for children older than 15 years old and in younger postpubertal children with Injury Severity Score (ISS) greater than 25. For prepubertal children, even with ISS greater than 25, we conditionally recommend against routine pharmacologic prophylaxis. Second, in children hospitalized after trauma, we conditionally recommend mechanical prophylaxis be considered for children older than 15 years and in younger postpubertal children with ISS greater than 25 versus no prophylaxis or in addition to pharmacologic prophylaxis. Lastly, in children hospitalized after trauma, we conditionally recommend against active surveillance for VTE with ultrasound compared with routine daily physical examination alone for earlier detection of VTE. The limited pediatric data and paucity of high-quality evidence preclude providing more definitive recommendations and highlight the need for clinical trials of prophylaxis.

LEVEL OF EVIDENCE

Systematic review/meta-analysis, level III.

Venous thromboembolism prophylaxis in the pediatric trauma patient

Although venous thromboembolism (VTE) occurs in less than 1% of hospitalized pediatric trauma patients, care providers must make decisions about VTE prophylaxis on a daily basis. The consequences of VTE are significant; the risks of developing VTE are variable; and the effectiveness of prophylaxis against VTE is not conclusive in children. While the value of VTE prophylaxis is well defined in adult trauma care, it is unclear how this translates to the care of injured children. This review evaluates the incidence and risks of VTE in pediatric trauma and assesses the merits of prophylaxis in children. Pharmacologic prophylaxis against VTE is a reasonable strategy in critically injured adolescent trauma patients. Further study is needed to establish the risks and benefits of VTE prophylaxis across the spectrum of injured children.

Venous Thromboembolism in Critical Illness and Trauma: Pediatric Perspectives

Critically ill children and those sustaining severe traumatic injuries are at higher risk for developing venous thromboembolism (VTE) than other hospitalized children. Multiple factors including the need for central venous catheters, immobility, surgical procedures, malignancy, and dysregulated inflammatory state confer this increased risk. As well as being at higher risk of VTE, this population is frequently at an increased risk of bleeding, making the decision of prophylactic anticoagulation even more nuanced. The use of pharmacologic and mechanical prophylaxis remains variable in this high-risk cohort. VTE pharmacologic prophylaxis is an accepted practice in adult trauma and intensive care to prevent VTE development and associated morbidity, but it is not standardized in critically ill or injured children. Given the lack of pediatric specific guidelines, prevention strategies are variably extrapolated from the successful use of mechanical and pharmacologic prophylaxis in adults, despite the differences in developmental hemostasis and thrombosis risk between children and adults. Whether the burden of VTE can be reduced in the pediatric critically ill or injured population is not known given the lack of robust data. There are no trials in children showing efficacy of mechanical compression devices or prophylactic anticoagulation in reducing the rate of VTE. Risk stratification using clinical factors has been shown to identify those at highest risk for VTE and allows targeted prophylaxis. It remains unproven if such a strategy will mitigate the risk of VTE and its potential sequelae.

Prevention of Hospital-Acquired Venous Thromboembolism in Children: A Review of Published Guidelines

Venous thromboembolism, which includes deep venous thrombosis and pulmonary embolism, is a potentially preventable condition in children. In adults, pharmacologic prophylaxis has been shown to significantly reduce the incidence of venous thromboembolism in distinct patient cohorts. However, pediatric randomized controlled trials have failed to demonstrate the efficacy of pharmacologic prophylaxis against thrombosis associated with central venous catheters, the most important risk factor for venous thromboembolism in children. Despite the lack of supporting evidence, hospital-based initiatives are being undertaken to try to prevent venous thromboembolism in children. In this study, we sought to review the published guidelines on the prevention of venous thromboembolism in hospitalized children. We identified five guidelines, all of which were mainly targeted at adolescents and used various risk-stratification approaches. In low-risk children, ambulation was the recommended prevention strategy, while mechanical prophylaxis was recommended for children at moderate risk and pharmacologic and mechanical prophylaxis were recommended for the high-risk group. The effectiveness of these strategies has not been proven. In order to determine whether venous thromboembolism can be prevented in children, innovative clinical trial designs are needed. In the absence of these trials, guidelines can be a source of valuable information to inform our practice.

Screening Guidelines for Venous Thromboembolism Risk in Hospitalized Children Have Low Sensitivity for Central Venous Catheter-Associated Thrombosis

OBJECTIVES

Local pediatric screening guidelines for venous thromboembolism (VTE) are developed from incomplete pediatric data and extrapolated from adult data in which immobility is a major risk factor. We hypothesized that screening guidelines centered on immobility are inadequate for identifying children at risk of central venous catheter (CVC)-associated VTE.

METHODS

This retrospective case-control (4:1) study at an academic, quaternary-level, free-standing children's hospital applied screening guidelines for VTE risk to all cases of VTE from July 2012 to April 2014. Cases and controls were classified as "at risk" or "not at risk" of VTE by guideline criteria. These guidelines assessed VTE risk factors, including CVC, as reported in the pediatric literature.

RESULTS

VTE prevalence was 0.5 per 100 admissions. Sixty-nine of 114 patients with radiographically confirmed VTE were classified as being "at risk" by the guidelines, with a sensitivity of 61%, specificity of 90.8%, a positive predictive value of 2.4%, and negative predictive value of 99.8%. There was no difference in screening guidelines sensitivity for identifying CVC-associated VTE versus non-CVC-associated VTE. Half of the 45 patients with VTE who were not captured as being "at risk" did not have decreased mobility, the entry point to the algorithm, and 80% of these patients had a CVC.

CONCLUSIONS

Screening guidelines have low sensitivity for identifying hospitalized children at increased risk of both CVC-associated and other VTE events. Decreased mobility is not a requirement for CVC-associated VTE. Risk factors extrapolated from adult data are insufficient for identifying children at risk of VTE.

Preventing acute care-associated venous thromboembolism in adult and pediatric patients across a large healthcare system

BACKGROUND

Although effective methods for venous thromboembolism prophylaxis (VTE-P) have been known for decades, reliable implementation has been challenging.

OBJECTIVE

Develop reliable VTE-P systems for adult and for pediatric patients to reduce preventable venous thromboembolism (VTE).

DESIGN

We used a discovery and diffusion system to first develop an effective system in 1 hospital location, and then spread the principle best practices across the entire 22-hospital system.

SETTING

Twenty-two Mayo Clinic hospitals (adults and children).

PATIENTS

Adult and pediatric patients.

INTERVENTION

(1) Ensure that a VTE-P is declared at admission by providing a mandatory VTE-P "tollgate" that requires the provider to assess the risk for VTE and provide an appropriate order for VTE-P. (2) Use clinical decision support to provide ongoing surveillance and alerts to providers when there is a lapse in the VTE-P plan.

MEASUREMENTS

In adults, VTE compliance as measured by the Centers for Medicare and Medicaid Services Core Measures VTE-1 and VTE-2, preventable VTE as measured by VTE-6, and in pediatric patients, appropriate VTE measures as determined by chart audit.

RESULTS

VTE-1 and VTE-2 have approached 97% to 100% and preventable VTE has declined to 0% for the last 3 quarters. Similarly, the pediatric VTE-P screening tool was evaluated and piloted with >92% compliance in risk documentation, appropriate VTE-P >64%, and 0 VTE events during the study period.

CONCLUSION

An integrated system-wide approach can lead to measurable improvements in VTE-P process and outcome measures. Journal of Hospital Medicine 2016;11:S15-S21. © 2016 Society of Hospital Medicine.

Quality improvement program reduces venous thromboembolism in infants and children with long-gap esophageal atresia (LGEA)

PURPOSE

Patients with long-gap esophageal atresia (LGEA) treated with the Foker process are at increased risk of venous thromboembolism (VTE). An institutional quality improvement program to decrease VTE risk factor exposure and utilize prophylactic anticoagulation was implemented. We aim to evaluate the efficacy and safety of a VTE risk-reduction program in patients with LGEA.

METHODS

Implementation and evaluation of a VTE risk-reduction program in patients with LGEA from 2012 to 2015 was performed. Symptomatic VTE with radiographic confirmation were defined as events. Post-program characteristics were evaluated and compared to a historical cohort.

RESULTS

Sixty-seven patients were identified. Two developed VTE (7 %) post-program implementation; compared to 13/40 (33 %) VTE incidence in the historical cohort (p = 0.018). Baseline demographics were similar, including age, esophageal atresia type and gap length. Post-protocol patients had fewer paralysis episodes (p = 0.004), paralysis days (p = 0.003), central venous catheters (p = 0.003), thoracotomies (p < 0.001), ventilator hours (p = 0.02), and decreased hospital (p < 0.001) and ICU stay (p < 0.001). All patients in the VTE risk-reduction program were exposed to prophylactic anticoagulation. No bleeding complications and/or thrombosis-related mortality occurred.

CONCLUSION

VTE risk-reduction program implementation decreased symptomatic VTE incidence with associated decreases in ICU and hospital length of stay. Prophylactic anticoagulation can be utilized safely in a complicated pediatric surgical population.

Risk Factors for Venous Thromboembolism in Pediatric Trauma Patients and Validation of a Novel Scoring System: The Risk of Clots in Kids With Trauma Score

OBJECTIVES

Identify risk factors for venous thromboembolism and develop venous thromboembolism risk assessment models for pediatric trauma patients.

DESIGN

Single institution and national registry retrospective cohort studies.

SETTING

John Hopkins level 1 adult and pediatric trauma center and National Trauma Data Bank.

PATIENTS

Patients 21 years and younger hospitalized following traumatic injuries at John Hopkins (1987-2011). Patients 21 years and younger in the National Trauma Data Bank (2008-2010 and 2011-2012).

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Clinical characteristics of Johns Hopkins patients with and without venous thromboembolism were compared, and multivariable logistic regression analysis was used to identify independent venous thromboembolism risk factors. Weighted risk assessment scoring systems were developed based on these and previously identified factors from National Trauma Data Bank patients (2008-2010); the scoring systems were validated in this cohort from Johns Hopkins and a cohort from the National Trauma Data Bank (2011-2012). Forty-nine of 17,366 pediatric trauma patients (0.28%) were diagnosed with venous thromboembolism after admission to our trauma center. After adjusting for potential confounders, venous thromboembolism was independently associated with older age, surgery, blood transfusion, higher Injury Severity Score, and lower Glasgow Coma Scale score. These and additional factors were identified in 402,329 pediatric patients from the National Trauma Data Bank from 2008 to 2010; independent risk factors from the logistic regression analysis of this National Trauma Data Bank cohort were selected and incorporated into weighted risk assessment scoring systems. Two models were developed and were cross-validated in two separate pediatric trauma cohorts: 1) 282,535 patients in the National Trauma Data Bank from 2011 to 2012 and 2) 17,366 patients from Johns Hopkins. The receiver operating curve using these models in the validation cohorts had area under the curves that ranged 90-94%.

CONCLUSIONS

Venous thromboembolism is infrequent after trauma in pediatric patients. We developed weighted scoring systems to stratify pediatric trauma patients at risk for venous thromboembolism. These systems may have potential to guide risk-appropriate venous thromboembolism prophylaxis in children after trauma.

Complications and 30-day Outcomes Associated With Venous Thromboembolism in the Pediatric Orthopaedic Surgical Population

INTRODUCTION

The risk of morbidity associated with venous thromboembolism (VTE) after pediatric orthopaedic surgery remains unclear despite increased use of thromboprophylaxis measures.

METHODS

The American College of Surgeons National Surgical Quality Improvement Program, Pediatric database was queried for patients undergoing an orthopaedic surgical procedure between 2012 and 2013. Upper extremity and skin/subcutaneous surgeries were excluded. Associations between VTE and procedure, demographics, comorbidities, preoperative laboratory values, and 30-day postoperative outcomes were evaluated.

RESULTS

Of 14,776 cases, 15 patients (0.10%) experienced postoperative VTE. Deep vein thrombosis (DVT) occurred in 13 patients (0.09%), and pulmonary embolism developed in 2 patients (0.01%). The procedure with the highest VTE rate was surgery for infection (1.2%). Patient factors associated with the development of VTE included hyponatremia (P = 0.003), abnormal partial thromboplastin time (P = 0.046), elevated aspartate transaminase level (P = 0.004), and gastrointestinal (P = 0.011), renal (P = 0.016), and hematologic (P = 0.019) disorders. Nearly half (46.2%) of DVTs occurred postdischarge. Complications associated with VTE included prolonged hospitalization (P < 0.001), pneumonia (P < 0.001), unplanned intubation (P = 0.003), urinary tract infection (P = 0.003), and central line-associated bloodstream infection (P < 0.001). Most of the postoperative complications (66.7%) occurred before VTE diagnosis, and no patients with VTE died.

CONCLUSION

In the absence of specified risk factors, thromboprophylaxis may be unnecessary for this population.

Neuroprotective measures in children with traumatic brain injury

Traumatic brain injury (TBI) is a major cause of death and disability in children. Severe TBI is a leading cause of death and often leads to life changing disabilities in survivors. The modern management of severe TBI in children on intensive care unit focuses on preventing secondary brain injury to improve outcome. Standard neuroprotective measures are based on management of intracranial pressure (ICP) and cerebral perfusion pressure (CPP) to optimize the cerebral blood flow and oxygenation, with the intention to avoid and minimise secondary brain injury. In this article, we review the current trends in management of severe TBI in children, detailing the general and specific measures followed to achieve the desired ICP and CPP goals. We discuss the often limited evidence for these therapeutic interventions in children, extrapolation of data from adults, and current recommendation from paediatric guidelines. We also review the recent advances in understanding the intracranial physiology and neuroprotective therapies, the current research focus on advanced and multi-modal neuromonitoring, and potential new therapeutic and prognostic targets.

Incidence of Deep Vein Thrombosis and Pulmonary Embolism in the Elective Pediatric Orthopaedic Patient

BACKGROUND

Although venous thromboembolism (VTE) has been well studied in the pediatric trauma population, rates of VTE associated with elective pediatric orthopaedic procedures have not been addressed in current literature. The purpose of this retrospective study was to identify the incidence of VTE in the elective pediatric orthopaedic surgical population and delineate subsets of this population at greatest risk. This study may provide valuable data to begin the process of resolving the controversy surrounding deep vein thrombosis prophylaxis in the pediatric orthopaedic population.

METHODS

The Pediatric Health Information System was queried for patients admitted on an ambulatory or inpatient basis, aged below 18 years, from January 2006 to March 2011 during which an elective orthopaedic surgery was the principal procedure performed. Patients with diagnoses or procedures related to infection, trauma, malignancy, or coagulopathies were excluded. Patients admitted through the emergency department or whose orthopaedic procedure was not performed on the admission date were excluded. Age, sex, ethnicity, race, admission year, and all procedures/diagnoses were recorded. The presence of VTE at the index admission or any subsequent readmission within 90 days was recorded. All criteria were coded using ICD-9-CM codes. Generalized logistic regression analyses were used to identify factors related to VTE.

RESULTS

A total of 143,808 admissions (117,676 patients) matched the inclusion criteria. Thirty-three had a VTE during the index admission with an additional 41 at subsequent readmissions, for a total incidence of 0.0515% by admission and 0.0629% by patient. In the multivariable model, variables significantly (P<0.05) related to VTE included increasing age, admission type, diagnosis of metabolic conditions, obesity, and/or syndromes, and complications of implanted devices and/or surgical procedures. No procedure variables were significantly related to VTE in the multivariable model.

CONCLUSIONS

The incidence of VTE in this cohort of pediatric patients undergoing elective orthopaedic surgery was 0.0515%. In children, underlying diagnosis seems to be a stronger predictor of VTE than procedures performed. Diagnosis with a metabolic condition, syndrome, and/or obesity, complications of implanted devices and/or surgical procedures, older age, and admission as an inpatient were significantly related to the development of a VTE.

LEVEL OF EVIDENCE

Level IV—case series.

Venous thromboembolism in hospitalized adolescents: an approach to risk assessment and prophylaxis

BACKGROUND

Pediatric hospital-acquired venous thromboembolism (VTE) is an increasingly prevalent and morbid disease. A multidisciplinary team at a tertiary children's hospital sought to answer the following clinical question: "Among hospitalized adolescents, does risk assessment and stratified VTE prophylaxis compared with no prophylaxis reduce VTE occurrence without an increase in significant adverse effects?"

METHODS

Serial literature searches using key terms were performed in the following databases: Medline, Cochrane Database, CINAHL (Cumulative Index to Nursing and Allied Health), Scopus, EBMR (Evidence Based Medicine Reviews). Pediatric studies were sought preferentially; when pediatric evidence was sparse, adult studies were included. Abstracts and titles were screened, and relevant full articles were reviewed. Studies were rated for quality using a standard rating system.

RESULTS

Moderate evidence exists to support VTE risk assessment in adolescents. This evidence comes from pediatric studies that are primarily retrospective in design. The results of the studies are consistent and cite prominent factors such as immobilization and central venous access. There is insufficient evidence to support specific prophylactic strategies in pediatric patients because available pediatric evidence for thromboprophylaxis efficacy and safety is minimal. There is, however, high-quality, consistent evidence demonstrating efficacy and safety of thromboprophylaxis in adults.

CONCLUSIONS

On the basis of the best available evidence, we propose a strategy for risk assessment and stratified VTE prophylaxis for hospitalized adolescents. This strategy involves assessing risk factors and considering prophylactic measures based on level of risk. We believe this strategy may reduce risk of VTE and appropriately balances the adverse effect profile of mechanical and pharmacologic prophylactic methods.