Risk Of Deep Venous Thrombosis Research Articles

Does diabetes mellitus increase the incidence of early thrombosis in deep vein following unicompartmental knee arthroplasty: a retrospective cohort study

BackgroundMany patients following unicompartmental knee arthroplasty (UKA) also suffer from diabetes mellitus, which may lead to an increased likelihood of postoperative deep venous thrombosis (DVT). Therefore, we evaluated whether DVT incidence would increase 3 days following UKA in diabetic patients.MethodsPatients who underwent UKA from August 2018 to September 2021 in our hospital were retrospectively included. Age, gender, body mass index, hypertension, mode of anesthesia, surgery time, intraoperative blood loss, tourniquet pressure and time, and glycosylated hemoglobin concentration were recorded as confounders. We compared the incidence and type of DVT between non-diabetic and diabetic patients and evaluated the effect of glycosylated hemoglobin levels on DVT.ResultsOf all the 224 patients, 96 had diabetes and 128 did not. Within 3 days after surgery, DVT occurred in 25 cases in the diabetic group and 17 cases in the non-diabetic group (p < 0.05), and the difference mainly exists in the lower limbs on the surgical side. Logistic regression analysis demonstrated that the risk of DVT in the diabetic group was 4.50 times higher compared with the non-diabetic group. For every 1 unit increase of glycosylated hemoglobin, the incidence of DVT increased 2.35 times. Differences in age, gender, body mass index, hypertension, mode of anesthesia, surgery time, intraoperative blood loss, tourniquet pressure, and time between the two groups were not significant.ConclusionsThe incidence of DVT in diabetic patients within 3 days after UKA was significantly higher than that in non-diabetic patients and was proportional to the concentration of glycosylated hemoglobin.

Prevalence of preoperative Deep Venous Thrombosis (DVT) following elderly intertrochanteric fractures and development of a risk prediction model

BackgroundThis study aimed to investigate the prevalence of preoperative deep venous thrombosis (DVT) following intertrochanteric fractures in the elderly and identify the associated factors, based on which a risk prediction model was developed.MethodThis was a retrospective single-center study of elderly patients presenting with intertrochanteric fractures between our institution between January 2017 and December 2020. Patients' duplex ultrasound (DUS) or venography results were retrieved to evaluate whether they had a preoperative deep venous thrombosis (DVT) of bilateral extremities, whereby patients were dichotomized. Various variables of interest on demographics, comorbidities, injury and biomarkers were extracted and their relationship between DVT were investigated. Statistically significant variables tested in multivariate logistics regression analyses were used to develop a risk prediction model.ResultsThere were 855 patients eligible to be included in this study, and 105 were found to have preoperative DVT, with a prevalence rate of 12.3%. Ten factors were tested as significantly different and 2 marginally significant between DVT and non-DVT groups in the univariate analyses, but only 6 demonstrated the independent effect on DVT occurrence, including history of a VTE event (OR, 4.43; 95%CI, 2.04 to 9.62), time from injury to DVT screening (OR, 1.19; 95%CI, 1.13 to 1.25), BMI (OR, 1.11; 95%CI, 1.04–1.18), peripheral vascular disease (OR, 2.66; 95%CI, 1.10 to 6.40), reduced albumin (2.35; 95%CI, 1.48 to 3.71) and D-Dimer > 1.0 mg/L(OR, 1.90; 95%CI, 1.13 to 3.20). The DVT risk model showed an AUC of 0.780 (95%CI, 0.731 to 0.829), with a sensitivity of 0.667 and a specificity of 0.777.ConclusionDespite without a so high prevalence rate of DVT in a general population with intertrochanteric fracture, particular attention should be paid to those involved in the associated risk factors above. The risk prediction model exhibited the improved specificity, but its validity required further studies to verify.

Tranexamic Acid Was Not Associated with Increased Complications in High-Risk Patients with Intertrochanteric Fracture.

For elective total joint arthroplasty, tranexamic acid (TXA) is considered safe and efficacious. However, evidence of TXA's safety in high-risk patients undergoing nonelective surgery for hip fracture is sparse. This study aimed to assess whether TXA administration to high-risk patients with an intertrochanteric (IT) hip fracture increased the risk of thromboembolic complications or mortality. All patients treated surgically for IT hip fracture between 2015 and 2019 across 4 hospitals of a single hospital system were considered. High- versus low-risk patients and those receiving TXA versus no TXA treatment were identified. Propensity scores adjusted for risk differences between patient groups with TXA and no TXA administration were calculated for (1) high-risk patients (n = 141) and (2) the entire population (n = 316). Postoperative mortality, deep venous thrombosis (DVT), pulmonary embolism (PE), myocardial infarction (MI), and stroke within 90 days of surgery were evaluated. No association between TXA administration and increased risk of mortality or complications in either group was identified. Specifically, out of 282 matched high-risk patients, no differences in mortality (odds ratio [OR], 0.97 [95% confidence interval (CI), 0.90, 1.05]), DVT (OR, 0.97 [95% CI, 0.93, 1.00]), PE (OR 1.00 [95% CI, 0.95, 1.05]), MI (OR, 1.04 [95% CI, 0.98, 1.10]), or stroke (OR, 1.00 [95% CI, 0.95, 1.05]) were identified. In our review of propensity-matched high-risk patients undergoing surgical repair for IT fracture, we found that TXA administration compared with no TXA administration was not associated with an increased risk of mortality, DVT, PE, MI, or stroke within 90 days of surgery. Therapeutic Level IV . See Instructions for Authors for a complete description of levels of evidence.

Preoperative erythrocyte sedimentation rate in patients with rheumatoid arthritis predicts deep vein thrombosis following total knee arthroplasty.

To thoroughly evaluate preoperative risk factors for deep venous thrombosis (DVT) in patients with knee rheumatoid arthritis (RA) undergoing unilateral total knee arthroplasty (TKA). Clinical data of 106 patients with knee RA who underwent unilateral TKA from August 2014 to October 2020 were collected. All patients received ultrasonic examination of the veins of both lower extremities on the third day after TKA and were divided into DVT and non-DVT groups. The associations between age, gender, body mass index (BMI), history of diabetes/hypertension, common serum lipid levels, indicators related to coagulation function, blood viscosity, erythrocyte sedimentation rate (ESR) and postoperative DVT were statistically compared and analyzed. ESR was significantly correlated with DVT risk after TKA (OR = 1.844, 95% CI = 1.022-2.981, P = 0.019). Receiver operating characteristic (ROC) curve analysis showed the optimal cut-off point of ESR for predicting DVT was 42 mm/h with a sensitivity of 95.5% and specificity of 66.7%. An increased preoperative ESR value is a risk factor for DVT in patients with knee RA following unilateral TKA. Pre-surgery control of ESR level and prevention of postoperative DVT in these patients are worthy of attention.

Risk of Deep Venous Thrombosis in Perioperative Heart Transplantation Patients

<h3>Purpose</h3> The risk of deep venous thrombosis (DVT) and related thromboembolic complications following heart transplantation (HT) patients has not been well characterized. We aimed to identify the incidence and predictors of DVT in HT recipients. <h3>Methods</h3> We performed a single center retrospective chart review of 101 consecutive HT patients spanning October 2018-February 2021. Our primary outcome was post-operative DVT during the index hospitalization or 30 days post-HT (whichever was longer) as diagnosed by venous duplex ultrasonography. Exposures ascertained included presence of mechanical circulatory support (MCS) devices (LVAD or temporary MCS), anticoagulation status, total central venous catheter (CVC) dwell-time, hypercoagulable state, and DVT prophylaxis regimen. Group comparisons were performed with Stata-17 using Fisher's exact test, t-test, and Wilcoxon-rank-sum test, as appropriate. The threshold for significance was defined as a two-sided p-value <0.05. <h3>Results</h3> There were no significant differences in baseline characteristics between patients who went on to develop DVT and those who did not (Table). Based on uniform ascertainment of right internal jugular vein (RIJ) patency via weekly ultrasounds, we detected DVTs in 26/100 patients with a RIJ catheter during admission. Total incidence of post-operative DVT was 32% (32/101) with 94% (30/32) of the DVTs occurring in veins instrumented with CVCs. Within the first 0-5 days of CVC dwell time, DVT incidence was 7% and climbed to 10% during days 6-10 of CVC exposure and 16% when CVC exposure was >10 days. Enoxaparin use was associated with a lower incidence of DVT compared to unfractionated heparin (p=0.04). <h3>Conclusion</h3> Post-heart transplant DVT is common and relates to the presence and dwell time of CVCs. Our data suggests that enoxaparin prophylactic use and minimizing CVC dwell-time may limit post-operative DVT burden. Further study is indicated to formally compare prophylaxis approaches and clinical implications of therapeutic treatment of post-HT DVTs.

Testosterone Replacement Therapy (TRT) is not Associated with a Higher Risk of DVT: Retrospective Analysis of US Claims Data

ABSTRACT Introduction As the prevalence of male hypogonadism (HG) has increased, more patients are prescribed TRT. TRT may be associated with an increased risk of deep venous thrombosis (DVT). Although in recent years there have been more studies dedicated to adverse effects of TRT, the literature is mixed on whether TRT increases the risk of DVT. Objective This study evaluates the risk of developing DVT in men with hypogonadism based on which types of treatments trends they receive using the MarketScan insurance claims database. Methods We performed a retrospective analysis of the IBM MarketScan™ Commercial Claims and Encounters database between 2008-2017. We identified all men with an HG diagnosis using the International Classification of Disease 9th edition (ICD-9) or 10th edition (ICD-10). We recorded how often they received TRT (including formulations as oral, topical/transdermal gels/creams/patches, intranasal, injections, and pellet implants). We followed men to see how many were diagnosed with DVT or pulmonary embolism. We excluded men who had a record of thromboembolic events before their first HG diagnosis. We performed univariate tests of variation across different demographics in three separate stratifications: 1) In all patients stratified by whether they suffered DVT; 2) In patients with DVT stratified by whether they received any kind of treatment at any time; 3) In patients with DVT and any treatment stratified by the type of treatment. Hazard Ratios from Cox Models were calculated for the effects of TRT in the previous 6 months on DVT controlling for the following confounding variables: age and comorbidities such as smoking, drug abuse, obesity, heart disease, cardiovascular problems and surgery/immobilization. Age and TRT in the previous 6 months were included as time-varying covariates. Results We identified 1,853,889 total men with HG, of which 21,414 (1.16%) were diagnosed with DVT. Among men who suffered DVT, 7,487 (34.96%) received TRT at some point compared to 605,534 (33.04%) of the men who did not suffer DVT. Results from time-varying Cox models suggest that receipt of TRT in the previous 6 months does not significantly increase the risk of developing a DVT (hazard ratio (HR) 1.049; 95% CI: 0.85, 1.29) among men with HG. Conclusions Our study suggests that TRT is not associated with a higher risk of developing DVT. DVT has evidence that the association was more pronounced among patients of later middle age and with chronic disease, whether with or without TRT. Further investigation is warranted to assess the risk effect of TRT on DVT development, which may allow for a more proactive approach in management. Disclosure No

Staging Bilateral Total Knee Arthroplasties Reduces Alignment Outliers.

Patients frequently present with bilateral symptomatic knee osteoarthritis and request simultaneous total knee arthroplasties (TKAs). Technical differences between simultaneous and staged TKAs could affect clinical and radiographic outcomes. We hypothesized that staged TKAs would have fewer mechanical alignment outliers than simultaneous TKAs. We reviewed 87 simultaneous and 72 staged TKAs with at least 2 years of follow-up. Radiographic assessment was done using standing long leg and lateral radiographs of the knee. Coronal and sagittal measurements were performed by 4 blinded observers on 2 separate occasions with an intraobserver agreement of 0.95 and interobserver of 0.92. The first simultaneous knee had no difference in the probability of establishing the mechanical axis outside 3° of neutral (45%) compared to the first staged knee (54%, P= .337). However, the second simultaneous knee (49%) was more likely to establish the axis outside mechanical neutral compared to the second staged knee (28%; odds ratio 2.54, confidence interval 1.31-4.94, P= .006). There was an increased risk of deep venous thrombosis with staged TKA (odds ratio 2.96, confidence interval 1.28-6.84, P= .011), but other perioperative complication rates were not significantly different. There were no clinically significant differences in range of motion or Knee Society Score. There is a significantly increased risk of establishing the second knee outside mechanical neutral during a simultaneous TKA compared to staged bilateral TKAs, possibly related to a number of surgeon-related and system-related factors. The impact on clinical outcomes and radiographic loosening may become significant in long-term follow-up.

Associations between coagulation factor XII, coagulation factor XI, and stability of venous thromboembolism: A case-control study

BACKGROUNDPulmonary embolism (PE) is a fatal clinical syndrome that is generally caused by an embolus from unstable deep venous thrombosis (DVT). However, clinical and biochemical factors that are related to the stability of DVT are not fully understood.AIMTo evaluate the relationships between plasma antigen levels of factor XII (FXII:Ag) and factor XI (FXI:Ag) with the stability of DVT.METHODSPatients with DVT and no PE, DVT and PE, and controls with no DVT or PE that matched for age, gender, and comorbidities were included in this study. FXII:Ag and FXI:Ag in peripheral venous blood were measured using enzyme-linked immunosorbent assays.RESULTSUsing the 95th percentile of FXI:Ag in patients with DVT and PE as the cut-off, a higher FXI:Ag was associated with a higher risk of unstable DVT (odds ratio: 3.15, 95% confidence interval: 1.18-8.43, P = 0.019). Stratified analyses showed consistent results in patients ≤ 60 years (P = 0.020), but not in those > 60 years (P = 0.346).CONCLUSIONHigher plasma FXI:Ag might be a marker for unstable DVT, which might be associated with PE in these patients.

Risk prediction for deep venous thrombosis after total knee arthroplasty based on modified Caprini risk assessment model:a confirmatory study

To investigate the effectiveness of modified Caprini risk assessment model(Caprini MRAM) in predicting the risk of deep venous thrombosis (DVT) after total knee arthroplasty (TKA). A case-control study was used to collect 43 patients with DVT after TKA in lower limb department of Sichuan Orthopedic Hospital from January 2016 to November 2020 in the positive group, and 172 patients without DVT after TKA in the same period according to the 1∶4 ratio between positive and control group were selected in the control group. Caprini MRAM was used to score and grade the risk of DVT. The clinical data, score and risk classification of the two groups were compared. The relationship between the risk of DVT in the patients after TKA and the risk factors in the risk ckassification and assessment of Caprini MRAM was analyzed by multivariate logistic regression model. The average score of caprini in DVT group was significantly higher than that in control group[(8.11±2.91) vs(4.07±2.12), P<0.001];DVT group was mainly at medium and high risk group(66.67%), while the control group was mainly at low risk (77.33%). There was a significant difference between the two groups in risk classification composition (P<0.001). BMI≥30 kg/m2, lower extremity edema (<1 month), severe pulmonary disease (<1 month), acute myocardial infarction (<1 month), bed rest (> 2 h), history of superficial or deep vein or pulmonary embolism and family history of thrombosis were the main risk factors for DVT in patients after TKA(all P<0.05). Preoperative D-dimer elevation (OR=4.380), BMI≥30 kg/m2(OR=2.518), lower extremity edema(<1 month)(OR=7.652), acute myocardial infarction (<1 month) (OR=1.994), bed rest (> 72 h)(OR=3.897), history of superficial or deep vein or pulmonary embolism (OR=13.517) and family history of blood embolism (OR=6.551) were independent risk factors for DVT in patients after TKA (all P<0.05). The risk of DVT was 13.457 and 2.739 times higher in high and moderate risk TKA patients with Caprini MRAM classification, respectively. Caprini MRAM can be used to predict the risk of DVT in patients after TKA, especially for patients with high risk.

Predictors of Deep Venous Thrombosis in Hospitalized Patients With Liver Cirrhosis in the US.

BackgroundPatients with liver cirrhosis were previously considered as anticoagulated; thus, their risk of developing venous thromboembolism (VTE) is lower. Recently, several studies showed contradicting results regarding deep venous thrombosis (DVT) occurrence in cirrhotic patients. The aim of this study is to evaluate the prevalence and risk associated with developing DVT in hospitalized cirrhotic patients in a large US population.MethodsWe queried the commercial database Explorys (IMB Inc., Armonk, New York), an aggregate of electronic health record data from 26 US healthcare systems. After excluding patients under 20 years old, a cohort of patients with a Systematized Nomenclature of Medicine - Clinical Terms of "cirrhosis of the liver" and "inpatient care" between 2015-2019 were identified, and prevalence of DVT was calculated in the exposure and the control groups. Statistical analysis for a multivariable model was performed. Factors adjusted for include gender, race, obesity, hypoalbuminemia, diabetes mellitus, viral hepatitis, and liver malignancy.ResultsAmong 9,990,290 patients who were hospitalized between 2015 and 2019, 157,400 patients had a diagnosis of liver cirrhosis. The prevalence of DVT in hospitalized patients with liver cirrhosis was 3.29% compared to 3.18% in non-cirrhotic patients. Using the multivariate analysis model, DVT was inversely associated with cirrhosis in hospitalized patients [OR: 0.921; p<0.0001] compared to patients without liver cirrhosis. Predictors of developing DVT among patients with cirrhosis were non-Caucasian race, obesity (BMI>30), liver malignancy, hypoalbuminemia, and diabetes mellitus. Cirrhotic patients due to viral hepatitis were less likely to develop DVT [OR: 0.775; p<0.001] compared to non-cirrhotic patients.ConclusionIn this database, although the prevalence of DVT in cirrhotic hospitalized patients was slightly higher than in non-cirrhotic patients (3.29% vs. 3.18%, respectively), cirrhosis as an independent factor was associated with less risk of DVT during hospitalization. This poses a question regarding DVT prophylaxis necessity in this group of patients. Further studies are needed to clarify the benefit and risks of DVT prophylaxis in cirrhotic patients.

One Year Prevalence of Venous Thromboembolism in Hospitalized COVID-19 Patients in France: Patients' Characteristics, Time Trends, and Outcomes.

Patients hospitalized with coronavirus disease-2019 (COVID-19) are at high risk of deep venous thrombosis (DVT) and pulmonary embolism (PE). The aims were to provide time trends in the 2020 nation-wide prevalence of venous thromboembolism (VTE) in patients hospitalized with a COVID-19 diagnosis in France, and to describe in-hospital and up to 30-day postdischarge death. All patients hospitalized in France with a COVID-19 diagnosis in 2020 were selected. Crude and age-adjusted prevalence of VTE and PE was computed by 4-week intervals and for the overall study period using Poisson regression. Time trends in in-hospital and 30-day postdischarge case-fatality rates were evaluated by comparing each 4-week intervals to weeks 10 to 14 corresponding to the first part of the first lockdown using logistic regression models. Among the 287,638 patients hospitalized with a COVID-19 diagnosis in 2020 in France, 14,985 (5.2%) had a concomitant VTE, with 10,453 (3.6%) having PE and 4,532 (1.6%) having DVT. In patients admitted to intensive care units, the crude prevalence of VTE and PE reached 16.1 and 11.0% respectively during the first lockdown. After adjustment, the prevalence of VTE and PE decreased during the year 2020 but a rebound was observed during the second lockdown. In-hospital case-fatality rates among hospitalized COVID-19 patients with PE globally decreased between the first and the second epidemic waves. Our study showed a decrease in the incidence of symptomatic VTE and PE in hospitalized COVID-19 patients, and a decreased time trend of outcomes during the second wave compared with the first one.

Incidence of Deep Venous Thrombosis (DVT) in Head and Neck Cancer Patients Receiving IV Fluids (IVF) via Peripheral IV (PIV) Compared to Central Venous Catheter

<h3>Purpose/Objective(s)</h3> Venous thromboembolism (VTE) is a common complication among cancer patients with a reported incidence close to 15% per year.^(1-3) One study found a VTE risk of 18.3% in the head and neck (H&N) cancer population using the Caprini risk assessment model.⁴ Up to 66% of VTE occurring in the upper extremity are due to intravenous catheters.⁵ This implies that recurring IV access for hydration would induce a clinically significant level of endothelial inflammation resulting in a higher risk of VTE. Therefore, patients with H&N cancer undergoing chemoradiotherapy who require repeated IV insertion for IV hydration appear to be at an increased risk for DVTs. We wanted to estimate the risk of DVT among H&N cancer patients undergoing regular IV hydration via peripheral IV as opposed to central venous catheter (CVC) to see if CVC use reduces the risk of DVT. <h3>Materials/Methods</h3> A retrospective database was created for patients at our institution from CY2019 to CY2020 who had a diagnosis of H&N cancer. We recorded the type of cancer, presence and location of DVT, if they were receiving IVF and if so, via CVC or PIV, and treatment received (chemo +/- XRT). We analyzed the number of patients who developed DVT and evaluated if there was a difference in incidence of DVT between those who received IVF through PIV or CVC. <h3>Results</h3> Out of 72 patients with H&N cancer, 7 were found to have DVT (9.7%). 57% of patients developed upper extremity DVT and 43% lower extremity. Two with DVT also had pulmonary embolus. 57% of patients were receiving IVF 2-3 times/week via PIV, 14% were receiving IVF through CVC, and the remaining 29% did not receive IVF. Out of these 7 patients who developed DVT, 6 (85.7%) were receiving both chemotherapy and radiation at the time of DVT, and the remaining patient was not receiving cancer treatment. <h3>Conclusion</h3> The data show a significant incidence of VTE among H&N cancer population. The preliminary data also shows an increased incidence of DVT among those receiving IVF via PIV compared to CVC, which supports a change of hydration protocol from PIV to CVC. Further prospective data will be obtained to add to the analysis.

Preoperative incidence and risk factors of deep vein thrombosis in patients with an isolated patellar fracture

PurposeThis study aimed to investigate the incidence, location, and related factors of preoperative deep venous thrombosis (DVT) in patients with isolated patellar fractures.MethodsPatients with an isolated patellar fracture, admitted between January 2013 and December 2019 at our institution, were retrospectively analyzed. Upon admission, patients underwent routine Doppler ultrasound scanning (DUS) of the bilateral lower extremities to detect DVT; those with DVT were assigned to the case group and those without DVT to the control group. Patients in both groups did not perform preoperative off-bed weight-bearing exercises. Data on demographics, comorbidities, and laboratory test results upon admission were extracted. Variables were evaluated between the two groups using univariate analyses, and independent risk factors associated with DVT were identified by logistic regression analysis.ResultsDuring the study period, 827 patients were included, of whom 5.8% (48/827) were found to have preoperative DVT. In DVT patients, 85.4%(41/48) were injured, 8.3%(4/48) were not injured, and 6.3%(3/48) were lower limbs. Multivariate analysis showed that male (male vs. female, odds ratio, OR = 2.25), delayed from injury to DUS (in each day, OR = 1.29), and elevated plasma D-dimer level (> 0.5 µg/mL, OR = 2.47) were independent risk factors associated with DVT.ConclusionsDespite the low prevalence of DVT after an isolated patellar fracture, this study underscores the importance of identifying those with a high risk of DVT, especially those with multiple identifiable factors, and encourage the early targeted use of anti-thromboembolic agents to reduce DVT occurrence.

Prevalence and Clinical Characteristics of Proximal Deep Venous Thrombosis After a High-Density Coronavirus Disease 2019 Cluster in a Japanese Psychiatric Hospital.

The prevalence of deep venous thrombosis (DVT) among hospitalized psychiatric patients after coronavirus disease 2019 (COVID-19) infection remains unclear.Methods and Results:We retrospectively investigated the prevalence of proximal DVT after COVID-19 infection among 50 hospitalized patients in a Japanese psychiatric hospital that in which a COVID-19 cluster developed between August and September 2020. The prevalence of proximal DVT was 10.0%. Patients with proximal DVT had a lower body weight and higher maximum D-dimer levels and International Medical Prevention Registry on Venous Thromboembolism (IMPROVE) VTE scores. After COVID-19 infection, hospitalized psychiatric patients are at high risk of DVT and should be carefully followed up.

The disquietude of clozapine continuation during the COVID-19 pandemic.

The disquietude of clozapine continuation during the COVID-19 pandemic.

Incidence and risk factors of preoperative deep venous thrombosis following pelvic and acetabular fractures: a retrospective case\u2013control study

The objective of this study was to investigate the prevalence of preoperative deep venous thrombosis (DVT) in the pelvic cavity and lower extremities following pelvic and acetabular fractures and to identify the risk factors of the occurrence of DVT. Duplex ultrasound (DUS) screening and blood tests were conducted in patients admitted from June 2012 to December 2020 for surgical treatment of pelvic and acetabular fractures. Univariate analyses were performed on data of demographics, comorbidities, time from injury to surgery, injury mechanism, accompanied injury, and laboratory results. The optimal cutoff values of continuous variables with statistical significance were obtained by using the receiver operating characteristic (ROC) curve. A multivariate logistic regression analysis was then employed to examine the independent values in terms of predicting preoperative DVT. A total of 607 patients with pelvic and acetabular fractures were included, among whom 82 (13.5%) patients sustained preoperative DVTs. Specifically, 31.7% (26/82) were diagnosed with proximal DVTs. Fifty-two (63.4%) patients had DVT within 7 days after injury, and 67 (81.7%) patients within 10 days. The multivariate logistic regression analysis identified 6 factors independently associated with the presence of preoperative DVT, including age > 46 years (odds ratio [OR] = 2.94), BMI > 26.73 kg/m2 (OR = 3.91), time from injury to surgery > 9 days (OR = 5.39), associated injury (OR = 7.85), ALB < 32.8 g/L (OR = 2.71) and FIB > 3.095 g/L (OR = 3.34). Despite the modern prophylactic regimen, the preoperative DVT in patients with pelvic and acetabular fractures still draws the attention of orthopaedic surgeons. Better understanding these risk factors can help surgeons refine the risk stratification profile and perform early interdisciplinary management for patients at high risk of DVT.

Association of AZD1222 and BNT162b2 COVID-19 Vaccination With Thromboembolic and Thrombocytopenic Events in Frontline Personnel : A Retrospective Cohort Study.

In March 2021, several European countries suspended the use of the AZD1222 (Oxford-AstraZeneca) COVID-19 vaccine because of thromboembolic safety concerns. Reports from Norway and Germany subsequently described patients with venous thrombosis and thrombocytopenia within 5 to 16 days of vaccination. To evaluate the risk for outcomes related to thrombosis and thrombocytopenia after AZD1222 or BNT162b2 (Pfizer-BioNTech) COVID-19 vaccination. Nationwide exploratory retrospective cohort study. Danish linkable registers on vaccinations, hospitalizations, occupation, and other covariates. 355209 Danish frontline personnel designated for priority COVID-19 vaccination followed from 27 December 2020 (the day of the first COVID-19 vaccination in Denmark) to 13 April 2021. Study outcomes were cerebral venous sinus thrombosis, splanchnic vein thrombosis, pulmonary embolism, deep venous thrombosis, arterial thrombosis, thrombocytopenia, and death. Cumulative incidences of study outcomes within 28 days of vaccination and unvaccinated risk time were compared using adjusted survival curves resulting in risk differences (RDs) at day 28 after vaccination. Adjustment for birth cohort, sex, calendar period, occupation, comorbid conditions, and prescription drug use was included. Vaccination with AZD1222 versus no vaccination was associated with a significant RD at day 28 for deep venous thrombosis (RD, 8.35 [95% CI, 0.21 to 16.49] per 100000 vaccinations). The RDs for cerebral venous sinus thrombosis (RD, 1.68 [CI, -0.64 to 4.00] per 100000 vaccinations) and thrombocytopenia (RD, 2.39 [CI, -1.09 to 5.87] per 100000 vaccinations) were not significant. No adverse associations were seen for BNT162b2 vaccination. No medical record review; surveillance bias. In this exploratory retrospective cohort study among frontline personnel in Denmark, receipt of the AZD1222 vaccine was associated with a small excess risk for deep venous thrombosis. Although the corresponding risks for the more rare and severe thrombotic outcomes (such as cerebral venous sinus thrombosis) were not statistically significantly increased, statistical precision was low, and clinically relevant risks could not be excluded with certainty. There was no statistically significant association of BNT162b2 vaccination with thrombotic or thrombocytopenic events. Lundbeck Foundation.

Prevalence and risk factors for venous thromboembolism in spinal metastasis patients undergoing decompression with internal instruments: Prospective cohort study

Objectivere is paucity in the literature on the epidemiological evidence of pulmonary thromboembolism (PE) and deep venous thrombosis (DVT) in spinal metastatic tumor patients. The aim of our study was to identify the incidence and risk factors for VTE in spinal metastasis patients treated with decompression with internal instruments. MethodsWe prospectively investigated the occurrence of VTE after decompression with internal fixations in 80 spinal metastasis patients. DVT was diagnosed by using a duplex ultrasonographical. PE was diagnosed by multidetector computed tomographic (CT) pulmonary angiography. Patient information and clinical parameters were collected. Risk factors were analyzed by comparing the difference between VTE and non-VTE cases. ResultsThe incidence of developing a DVT was 6.3% (5/80). No patient suffered PE. In univariate analysis, the mean length of hospital stay after surgery until discharge for VTE group was longer than non-VTE group, ODI scores and AIS in VTE group were significantly worse than non-VTE group, D-dimer one-day postoperatively for VTE group was significantly higher than non-VTE group. In logistic regression, D-dimer at one-day postoperatively was the only risk factor. The areas under the ROC curves for the D-dimer (post) to distinguish between non-VTE and VTE was 0.971(P value=0.000). By means of the ROC analysis, the optimum thresholds of D-dimer(post) were determined to be 9.51 mg/L. The sensitivity and specificity for the optimum threshold were 100.0% and 92.0%. ConclusionThe prospective study of 80 patients with spinal metastasis who underwent decompression with internal fixation revealed an incidence of DVT of 6.3%, patients with increasingly D-dimer level at one-day postoperatively had a higher risk of DVT, and the optimum thresholds of D-dimer(post) were determined to be 9.51 mg/L.

Upper Extremity Deep Venous Thrombosis Risk Factors, Associated Morbidity and Mortality in Trauma Patients.

The literature on upper extremity deep venous thrombosis (UEDVT) is not as abundant as that on lower extremities. This study aimed to identify the risk factors for UEDVT, associated mortality and morbidity in trauma patients and the impact of pharmacological prophylaxis therein. A 3-year retrospective review of patients admitted to a Level 1 trauma center was conducted. Patients aged 18 years or older who had experienced a traumatic event and had undergone an upper extremity ultrasound (UEUS) were included in the study. Multiple logistic regression was used to identify independent risk factors that contributed to UEDVT. A total of 6,607 patients were admitted due to traumatic injuries during the study period, of whom 5.6% (373) had at least one UEUS during their hospitalization. Fifty-six (15%) were diagnosed with an UEDVT, as well as three non-fatal pulmonary emboli (PE) and four (7.1%) deaths, p = 0.03. Pharmacological prophylaxis with low-molecular-weight heparin (LMWH) or unfractionated heparin showed a protective effect against UEDVT; among the patients positive for UEDVT, 14 of 186 patients (7.5%) received LMWH, while 42 of 195 (21.5%) did not receive LMWH (p < 0.001). Multiple logistic regression revealed that the presence of upper extremity fractures, peripherally inserted central catheter (PICC) lines, and traumatic brain injury (TBI) were independent risk factors for UEDVT. UEDVT are associated with a higher mortality. The presence of upper extremity fractures, PICC lines, and TBI were independent risk factors for UEDVTs. Further, pharmacological prophylaxis reduces the risk of UEDVT.

Association Between Monocyte Count and Preoperative Deep Venous Thrombosis in Older Patients with hip Fracture: A Retrospective Study.

PurposeTo analyze the relationship between monocyte count and preoperative deep venous thrombosis (DVT) in older patients with hip fracture.MethodsConsecutive older patients with hip fracture undergoing surgery were included from January 2014 to December 2021. Monocyte count was measured on admission, and Doppler ultrasonography was performed for DVT screening prior to surgery. Univariate and multivariate logistic regression analyses were used to assess the association between monocyte count and DVT.ResultsA total of 674 patients were finally included, and 128 patients (19.0%) were diagnosed with preoperative DVT. Patients with DVT exhibited a higher monocyte count than patients without DVT [0.55 (0.43-0.72) × 109/L versus 0.49 (0.38-0.63) × 109/L, P = 0.007]. Multivariate logistic regression analysis showed that a high monocyte count (> 0.6 × 109/L) was independently associated with a higher risk of DVT (OR = 1.705, 95% CI: 1.121-2.593, P = 0.013), and for every 0.1 × 109/L increase in monocyte count, the risk of DVT increased by 8.5% (OR = 1.085, 95% CI: 1.003-1.174, P = 0.041). Other risk factors associated with DVT included intertrochanteric fracture (OR = 1.596, 95% CI: 1.022-2.492, P = 0.040), and elevated fibrinogen level (OR = 1.236, 95% CI: 1.029-1.484, P = 0.023).ConclusionA high monocyte count is associated with an increased risk of DVT in older patients with hip fracture. Future studies should evaluate the potential role of monocyte in the prevention and treatment of thrombosis.