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Contemporary Oncology/Współczesna Onkologia
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1/2018
vol. 22
 
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Original paper

The comparison between Caprini and Padua VTE risk assessment models for hospitalised cancer patients undergoing chemotherapy at the tertiary oncology department in Poland: is pharmacological thromboprophylaxis overused?

Robert F. Łukaszuk, Justyna Dolna-Michno, Krzysztof Plens, Grzegorz Czyżewicz, Anetta Undas

Contemp Oncol (Pozn) 2018; 22 (1): 31-36
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Introduction

Hospital stay precedes 10–20% of venous thromboembolism (VTE) episodes [1–3] and 10% of inhospital deaths are related to VTE [4, 5]. Cancer is associated with a 4.1-fold greater risk of thrombosis [6, 7]. Approximately 20% of cancer patients develop VTE, which represents a frequent cause of death in these patients [8]. The key VTE risk factors are the primary site of cancer and the presence of distant metastasis [6, 8–12]. Patients with cancer and co-existing VTE have a 2-fold or greater mortality compared with those without thrombosis, even after adjusting for the disease stage [12, 13]. Lung cancer is the most common malignancy in malignancy-associated VTE patients [14]. Blom et al. [15] demonstrated that this risk among lung cancer patients increased 20-fold compared with the general population and patients diagnosed with lung adenocarcinoma have a higher risk of VTE than those suffering from squamous cell carcinoma. Over 3% of lung cancer patients develop VTE within 2 years since diagnosis [16] and such episodes are associated with a 50% higher risk of death within 2 years [17].
The aim of our study is to evaluate the risk of VTE among cancer inpatients and the use of thromboprophylaxis in order to assess the current trends in thromboprophylaxis among Polish inpatients.

Material and methods

We enrolled all consecutive patients aged 18 years or more with the confirmed diagnosis of cancer who were hospitalized from October 2016 to May 2017 in the Department of Oncology, John Paul II Hospital in Krakow, Poland. Solely patients who stayed in hospital for more than 24 hours were eligible. No exclusion criteria were used.
Demographic and clinical data were collected using questionnaires. The cancer stage was established based on clinical assessment and imaging based on the 8th Edition of the UICC TNM classification of Malignant Tumours [18] . Patients admitted to hospital more than once due to a cycle of chemotherapy were scored during the last stay within the given period of time. The study was conducted in accordance with local legal regulations.
We used two validated scoring systems to identify patients at high risk for VTE when hospitalized, i.e. the Padua prediction score and Caprini VTE risk assessment [3, 19, 20]. The Padua prediction score, indicating a high risk, was defined as a score of 4 or higher. The Caprini VTE risk assessment identifies high risk as a score of 5 or higher. Pharmacological prophylaxis was administration of enoxaparin (40 mg once daily s.c. throughout hospitalisation). Mechanical prophylaxis (graduated compression stockings) was also recorded. The decision regarding thromboprophylaxis was at the managing physician’s discretion. Not using thromboprophylaxis in patients at high risk for VTE identified using one of the scoring systems was recognized as the underuse of prophylaxis while the overuse was recognized as using any thromboprophylaxis in patients identified as at low risk.

Statistical analysis

Variables were presented as numbers and percentages for categorical variables or by median and interquartile range for continuous parameters. Nominal variables in the subgroups were compared with the Pearson’s 2 test or the Fisher’s exact test for 2 × 2 tables as appropriate. Continuous variables were compared using the Mann-Whitney U test. The comparison of two scoring systems was performed using the McNemara’s test. To identify independent predictors of thromboprophylaxis overuse, univariate logistic regression analysis was performed. Associations between two variables were expressed as odds ratios (OR) along with 95% confidence intervals (95% CI). All p-values were two-sided and considered statistically significant if below 0.05. All calculations were done with JMP®, Version 13.1.0 SAS Institute Inc., Cary, NC.

Results

We enrolled 1983 consecutive hospitalisations of 498 individuals, including 318 (63.8%) men (Table 1). Median age was 64.85 (range from 18 to 86) years. Median duration of hospitalisation was 3 (range from 2 to 5) days. The majority of individuals (n = 363 [72.9%]) suffered from lung cancer (Table 1). We identified 419 (84.14%) patients who received thromboprophylaxis with enoxaparin including 181 (43.2%) patients using concomitant mechanical thromboprophylaxis. There were no patients receiving the latter intervention among subjects without pharmacological thromboprophylaxis. One patient (0.2%) suffered from cancer-related VTE diagnosed shortly before the hospital. None of the patients received oral anticoagulants. Participants received enoxyparixe according to scoring system results despite anti-platelet agents which they could use due to coronary artery disease. None of the individuals received anti-platelet agents as a type of thromboprophylaxis. The characteristic of study population was placed in Table 1. Types of chemotherapy in association with thromboprophylaxis are listed in Table 2. Chemotherapy was stopped in 12 (2.4%) patients due to side effects.

The Padua prediction score

As shown in Table 3, using the Padua prediction score, we identified 39 (7.8%) patients at high risk of VTE, including 28 (71.8%) who received thromboprophylaxis. Eleven (28.2%) high-risk patients did not receive thromboprophylaxis. There were no prophylaxis related intergroup differences depending on the type of cancer or its stage. Overall, the majority of inpatients did not have high VTE risk assessed using the Padua prediction score and 71.8% of high risk patients received thromboprophylaxis with the concomitant large overuse of pharmacological prophylaxis.

Caprini VTE risk assessment

We identified 257 (51.6%) patients at high risk for VTE (Table 4), including 213 (82.9%) who received thromboprophylaxis, and only 44 (17.1%) who did not. The number of individuals at low risk for VTE was 241 (48.4%), including 210 (87.1%) receiving thromboprophylaxis despite the low risk.

The comparison of two systems

As shown in Table 5, the Caprini risk assessment classified more cancer inpatients into the high VTE risk group. The differences between two systems in terms of proportions of subjects at high and low VTE risk were highly significant.

Predictors of the overuse of thromboprophylaxis

Predictors of overused thromboprophylaxis were previous VTE and abnormal pulmonary function for both scales, while age over 75 years and swollen legs were identified for the Caprini risk assessment alone and varicose veins for Padua prediction score alone (Table 1). The type of chemotherapy did not affect the overuse of thromboprophylaxis.

Clinical events during hospitalisation

Three vascular thromboembolic events were recorded in 3 patients (0.60%) during hospital stay. There were non-ST elevation myocardial infarction, ST elevation myocardial infarction and right-sided deep vein thrombosis. No major bleeding was observed. Hemoptysis probably associated with lung cancer was observed in 8 (1.6%) patients who reported this symptom prior to admission and received thromboprophylaxis on the ward without increased bleeding. No in-hospital deaths were observed.

Discussion

This study shows that nowadays thromboprophylaxis is suboptimal in lung cancer patients hospitalized for chemotherapy. Although patients eligible for thromboprophylaxis represented a small proportion of our study group when assessing the VTE risk using 2 scoring systems, most received the recommended subcutaneous LMWH. The overuse of pharmacological thromboprophylaxis was observed in our patients regardless of the scoring system used, although no major bleeding during hospital stay was observed. Given large differences in the proportions of cancer patients categorized into the high VTE risk groups between the 2 scoring systems, it might be speculated that advanced cancer inpatients undergoing chemotherapy should be evaluated using other systems than the two most commonly used in medical non-cancer hospitalized patients.
Our study reported that prophylactic LMWH is more commonly used among lung cancer inpatients compared with those suffering from a wide range of pulmonary diseases in the same Polish tertiary hospital [20]. Awareness of the VTE risk, as the most common preventable cause of death in hospitals, has increased in Poland, where several local guidelines have been issued over the last 10 years [10, 17]. Polish guidelines on the prevention of VTE in patients with cancer conservatively treated have recommended using the Padua Prediction Score to estimate the risk of VTE [17]. However, the current study showed that this system identifies high VTE risk in a small subset of hospitalized patients undergoing chemotherapy and the proportion is much lower compared with another system introduced by Caprini. It indicates that a real clinical value of the current assessment models for cancer inpatients should be re-evaluated and there is a need for modifications of the scoring systems to improve VTE risk assessment in cancer inpatients.
To our knowledge, the two scoring systems used in this study have not been tested in cancer inpatients yet. Our study suggests that in cancer patients the Caprini risk assessment might be preferred. Larger prospective studies are needed to validate this observation, which appears in line with other studies in different inpatient groups. Liu X et al. showed in Chinese inpatients that Caprini risk assessment had a higher sensitivity and both positive and negative predictive values than the Padua prediction score in hospitalized patients [21]. Zhou HX et al. reported similar findings and also noticed that the Caprini risk assessment score could be helpful in predicting the risk of recurrent VTE in inpatients [22].
A surprising overuse of thromboprophylaxis with LMWH in cancer inpatients observed in the current study deserves a comment. It might be speculated that the overuse of prophylactic LMWH was associated with physician’s concerns for a significant risk of VTE among cancer patients, which have been observed also by us. Van Es et al. showed that 6.1% of patients with solid cancer developed VTE and the prediction scores performed poorly in predicting VTE in cancer patients [23]. We noticed that most of the overuse predictors for both scales were well-established risk factors of developing VTE [1]. Given high cost of pharmacological thromboprophylaxis for our healthcare system when overused, administration of LMWH in hospitalized cancer patients should be reconsidered and used when indicated. Nevertheless, bleeding complications in patients with advanced lung cancer who simultaneously received chemotherapy and thromboprophylaxis have been observed infrequently in the published reports, i.e. in 1–3.7% of patients [24]. Our analysis showed that knowledge of benefits from thromboprophylaxis used in cancer patients among oncologists is larger than 10 years ago, when the ENDORSE study had been performed and showed no prophylaxis in 67.5% of medical patients, including cancer patients [2].
Thromboprophylaxis with enoxaparin in cancer inpatients was found to be efficacious, with 3 individuals who developed 3 vascular events, including one venous and 2 arterial episodes. This confirms that thromboprophylaxis with LMWH is not effective in preventing myocardial infarction in subjects with large atherosclerotic burden. Moreover, cancer may increase the risk of MI and ischemic stroke [25]. Such prothrombotic potential related to cancer cannot be abolished using prophylactic doses of enoxaparin which is effective in preventing VTE, with a single case of its failure, namely venous thrombosis despite prophylaxis.
This study has several limitations. It is retrospective, which implies inherent problems with data acquisition and its completeness. Patients were not screened for asymptomatic VTE events, therefore the number of episodes could be underrepresented in this study. Long-term follow-up in terms of occurrence of VTE after discharge was beyond scope of the study. Given growing use of non-vitamin K antagonist oral anticoagulants worldwide, their role in VTE prevention in cancer remains to be established [26]. Regarding the data presentation, R2 measures for logistic regression models (i.e. Cox and Snell R2) were not reported based on lower priority for such measures as compared to OR and 95% CI [27]. We cannot exclude using vitamin supplements which might affect thrombosis risk, however it is unlikely that this factor impacted our results.
In conclusion, the use of thromboprophylaxis in advanced cancer patients hospitalized due to chemotherapy is suboptimal. We showed the overuse of thromboprophylaxis in the oncology department however without significant bleeding risk. Our study suggests that both scoring systems are not consistent in the risk evaluation among hospitalized cancer patients and there is a need for better scoring systems to be applied in this disease.

The authors declare no conflict of interest.

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Address for correspondence

Robert F. Łukaszuk
Department of Pulmonology
John Paul II Hospital in Krakow
Prądnicka 80
31-202 Krakow, Poland
e-mail: robertlukaszuk@yahoo.com

Submitted: 15.12.2017
Accepted: 5.02.2018
Copyright: © 2018 Termedia Sp. z o. o. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
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