key: cord-0032043-gz7776xs
authors: Al-Dorzi, Hasan M.; Al-Dawood, Abdulaziz; Al-Hameed, Fahad M.; Burns, Karen E. A.; Mehta, Sangeeta; Jose, Jesna; Alsolamy, Sami; Abdukahil, Sheryl Ann I.; Afesh, Lara Y.; Alshahrani, Mohammed S.; Mandourah, Yasser; Almekhlafi, Ghaleb A.; Almaani, Mohammed; Al Bshabshe, Ali; Finfer, Simon; Arshad, Zia; Khalid, Imran; Mehta, Yatin; Gaur, Atul; Hawa, Hassan; Buscher, Hergen; Lababidi, Hani; Al Aithan, Abdulsalam; Arabi, Yaseen M.
title: The effect of intermittent pneumatic compression on deep-vein thrombosis and ventilation-free days in critically ill patients with heart failure
date: 2022-05-20
journal: Sci Rep
DOI: 10.1038/s41598-022-12336-9
sha: 4ec2b2377c5041edc1de4e0fb616668187da1fc5
doc_id: 32043
cord_uid: gz7776xs

There are contradictory data regarding the effect of intermittent pneumatic compression (IPC) on the incidence of deep-vein thrombosis (DVT) and heart failure (HF) decompensation in critically ill patients. This study evaluated the effect of adjunctive use of IPC on the rate of incident DVT and ventilation-free days among critically ill patients with HF. In this pre-specified secondary analysis of the PREVENT trial (N = 2003), we compared the effect of adjunctive IPC added to pharmacologic thromboprophylaxis (IPC group), with pharmacologic thromboprophylaxis alone (control group) in critically ill patients with HF. The presence of HF was determined by the treating teams according to local practices. Patients were stratified according to preserved (≥ 40%) versus reduced (< 40%) left ventricular ejection fraction, and by the New York Heart Association (NYHA) classification. The primary outcome was incident proximal lower-limb DVT, determined with twice weekly venous Doppler ultrasonography. As a co-primary outcome, we evaluated ventilation-free days as a surrogate for clinically important HF decompensation. Among 275 patients with HF, 18 (6.5%) patients had prevalent proximal lower-limb DVT (detected on trial day 1 to 3). Of 257 patients with no prevalent DVT, 11/125 (8.8%) patients in the IPC group developed incident proximal lower-limb DVT compared to 6/132 (4.5%) patients in the control group (relative risk, 1.94; 95% confidence interval, 0.74–5.08, p = 0.17). There was no significant difference in ventilator-free days between the IPC and control groups (median 21 days versus 25 days respectively, p = 0.17). The incidence of DVT with IPC versus control was not different across NYHA classes (p value for interaction = 0.18), nor across patients with reduced and preserved ejection fraction (p value for interaction = 0.15). Ventilator-free days with IPC versus control were also not different across NYHA classes nor across patients with reduced or preserved ejection fraction. In conclsuion, the use of adjunctive IPC compared with control was associated with similar rate of incident proximal lower-limb DVT and ventilator-free days in critically ill patients with HF. Trial registration: The PREVENT trial is registered at ClinicalTrials.gov, ID: NCT02040103 (registered on 3 November 2013, https://clinicaltrials.gov/ct2/show/study/NCT02040103) and Current controlled trials, ID: ISRCTN44653506 (registered on 30 October 2013).

Heart failure (HF) is a major risk factor for venous thromboembolism (VTE), whether deep-vein thrombosis (DVT) or pulmonary embolism [1] [2] [3] [4] [5] . The prevalence of DVT among patients with HF has been reported to range from 4 to 26% and the prevalence of pulmonary embolism as high as 9.1% 6 . The risk of VTE increases as the left ventricular ejection fraction decreases and as the New York Heart Association (NYHA) functional class increases 2, 7 . In acutely or critically ill medical patients, pharmacologic thromboprophylaxis is preferred over no pharmacologic prophylaxis 8 . This was based on evidence from multiple randomized trials showing that pharmacologic prophylaxis versus placebo was more effective [9] [10] [11] [12] . In patients with HF, who constituted 34.1 to 51.7% of patients enrolled in these trials [9] [10] [11] , the reduction in VTE rates was by 26-59% 6, 7, [9] [10] [11] 13 . Pharmacologic thromboprophylaxis is also preferred over mechanical prophylaxis in acutely or critically ill medical patients (very low certainty in the evidence) 8, 14 . In at-risk hospitalized patients with a contraindication for pharmacologic thromboprophylaxis, mechanical prophylaxis with intermittent pneumatic compression (IPC) 15 is recommended 8, [16] [17] [18] [19] [20] [21] [22] . In addition, IPC has been recommended as an adjunct to pharmacologic prophylaxis in selected high-risk populations, including subgroups of critically ill patients 20, 22 . IPC devices are thought to prevent venous thrombi by increasing venous blood flow and reducing stasis in the leg veins 23 . As hospitalized patients with HF frequently have lower limb venous congestion and pulmonary edema, concerns exist regarding the use of IPC in this patient cohort due to the potential of worsening HF. IPC can augment venous return, and increase both central venous and pulmonary artery pressures 24 . These physiologic effects may theoretically exacerbate HF leading to the suggestion that IPC should not be used for thromboprophylaxis in patients with HF 25 .

Only a few small studies have assessed the hemodynamic effects of IPC in patients with HF-including small numbers of patients with heterogenous severity of HF and assessing short-term physiologic changes-and have not demonstrated HF decompensation [26] [27] [28] . In a study of 20 patients with HF monitored by pulmonary artery catheterization, there were no significant changes in any hemodynamic parameters and no clinical deterioration 26 . In 19 patients with left ventricular ejection fraction < 40% (mean 29%) and NYHA class II and III, thigh-length IPC did not exacerbate symptoms and transiently improved cardiac output, probably through an increase in stroke volume and a reduction in systemic vascular resistance 27 . No detrimental effect on diastolic cardiac function and no adverse clinical events were noted 27 . In 14 patients with HF (left ventricular ejection fraction < 40% and NYHA class II and III), IPC, which was activated only after intravenous diuretics and symptomatic improvement, did not lead to significant differences in blood pressure, central venous pressure, systemic vascular resistance or cardiac output 28 . Additionally, brain natriuretic peptide levels did not change 28 .

Studies evaluating the effectiveness of combined mechanical and pharmacologic prophylaxis versus pharmacologic prophylaxis alone among very high risk patient groups have been advocated 8 www.nature.com/scientificreports/ with HF have multiple risk factors for VTE, the adjunctive use of IPC with pharmacologic prophylaxis has an unknown but potentially additive effect on VTE prevention. However, whether IPC has clinically important adverse effects remains unknown. In this preplanned secondary analysis of the PREVENT trial, we tested the hypothesis that adjunctive IPC reduces the incidence of DVT among critically ill patients with HF without precipitating HF decompensation, or increasing mortality.

The PREVENT trial. The PREVENT trial (Pneumatic Compression for Preventing Venous Thromboembolism trial, Clinicaltrials.gov: NCT02040103 and Current controlled trials: ISRCTN44653506) 29,30 evaluated whether adjunctive IPC combined with pharmacologic thromboprophylaxis with unfractionated heparin or low-molecular-weight heparin compared to pharmacologic thromboprophylaxis alone, reduced incident proximal lower-limb DVT. The trial was conducted at 20 sites in Saudi Arabia, Canada, Australia, and India. We enrolled adult medical, surgical, or trauma ICU patients who weighed at least 45 kg, were expected to stay in ICU for at least 72 h and were eligible for pharmacologic thromboprophylaxis with either unfractionated heparin or low-molecular-weight heparin. Twice-weekly lower-limb ultrasonography was performed until ICU discharge, death, full mobility, or 28 days after enrollment, whichever occurred first. The trial demonstrated that adjunctive IPC did not result in a reduction in incident proximal leg DVT compared with pharmacologic prophylaxis 31 .

All methods were carried out in accordance with relevant guidelines and regulations including Good Clinical Practice 32 .

Patients. In the current study, we performed an a priori determined analysis 29, 30 of critically ill patients with HF. The presence of HF was determined by the treating teams according to local practices, which was based on the reported symptoms and signs that were typical of congestion with compatible findings on chest radiography, elevated natriuretic peptide biomarkers and/or cardiac imaging 33, 34 . We further categorized patients based on NYHA functional class 35 and left ventricular ejection fraction. NYHA class (I to IV) was determined by reviewing the reported symptoms and activity level before enrollment in the trial. The left ventricular ejection fraction (≥ 40% versus < 40%) was obtained from echocardiography performed before enrollment in the trial. This ejection fraction cutoff has been used in several clinical trials to define HF with reduced (< 40%) versus preserved ejection fraction (≥ 40%) 33,34,36 . Intervention and co-interventions. In patients who were randomized to IPC, the device was applied to both lower limbs for at least 18 h per day, with the sleeves removed every 8 h for skin inspection and care 31 . The study protocol prioritized the use of sequential compression devices (multi-chamber cuffs) and thigh-length sleeves when available but permitted the use of non-sequential devices (single-chamber cuffs) and knee-length sleeves. IPC use was discontinued for suspected or confirmed DVT, pulmonary embolism, leg ulcer, or ischemia; and at the discretion of the treating team, for palliation, full mobility, ICU discharge, or at study day 28 31 . In the control group, IPC was permitted only during interruption of pharmacologic thromboprophylaxis. Graduated compression stockings were not permitted in either group. Other aspects of patient management were at the discretion of the treating team, including post-randomization prescription of systemic anticoagulation and antiplatelet agents, HF management, and investigation for pulmonary embolism 31 .

Measurements. Bilateral proximal lower-limb venous ultrasound was performed within 48 h of randomization, then twice weekly and on clinical suspicion of DVT by certified ultrasonographers 31 . The venous system was assessed for compressibility at 1-cm intervals at the following locations: common femoral vein, proximal superficial femoral vein, mid superficial femoral vein, distal superficial femoral vein, popliteal vein and venous trifurcation 31 . The ultrasound studies were interpreted by radiologists who were unaware of the patient's treatment assignment. Proximal DVT was defined as partial or complete incompressibility of a venous segment in any site. Examination of the distal leg veins (peroneal, posterior tibial, anterior tibial, and muscular veins) was performed based on local hospital practices 31 .

Health Evaluation II (APACHE II) score at ICU admission, VTE risk factors before ICU admission (hospitalization in the preceding 3 months for any reason, paralysis or immobilization of a lower or upper extremity related to stroke or injury prior to hospital admission, active malignancy, recent surgery, acute stroke, trauma, personal history of VTE, family history of VTE, known thrombophilia, post-partum state within 3 months, and estrogen therapy), and specific information regarding HF including NYHA functional classification (I to IV), and left ventricular ejection fraction of < 40% or ≥ 40%. We collected data on the intervention (IPC type and duration) and co-interventions (including agent of pharmacologic prophylaxis, therapeutic anticoagulation for reasons other than VTE, use of organ support (vasopressors, mechanical ventilation, and renal replacement therapy), location of central venous catheters, use of antiplatelets and statins. We also noted the diagnostic workup for pulmonary embolism and non-lower-limb venous thrombosis, which were requested at the discretion of the treating team.

The primary outcomes were incident proximal lower-limb DVT (diagnosed after day 3) and ventilator-free days. We considered ventilator-free days to be a surrogate for decompensation of HF. Secondary outcomes included prevalent lower-limb DVT (detected on trial days 1 to 3), incident distal lower-limb thrombosis, nonlower-limb venous thrombosis, acute pulmonary embolism, mechanical ventilation duration, vasopressor-free days, days to incident lower-limb DVT, ICU and hospital mortality and mortality at 28 and 90 days.

Statistical analysis. We compared the baseline characteristics, intervention, and co-interventions between the IPC and control groups. We used Student's t-test or the Mann-Whitney U test for continuous variables based www.nature.com/scientificreports/ on normality assumption and the chi-square test or Fisher's exact test for categorical variables as appropriate. The effect of IPC versus no IPC on binary categorical outcomes was presented as a relative risk with 95% confidence interval (CI). Kaplan-Meier curves were used to compare the freedom from incident lower-limb DVT within the first 28 days in ICU and 90-day survival. The log rank test was used to compare the two groups.

We assessed incident proximal lower-limb DVT, ventilator-free days and 90-day mortality in selected subgroups and reported the results of tests of interactions. The subgroups were unfractionated heparin and low-molecular-weight heparin for thromboprophylaxis, BMI < 30 kg/m 2 and BMI ≥ 30 kg/m 2 , ejection fraction of < 40% and ≥ 40%, femoral central venous catheter and no femoral central venous catheter at the time of enrollment, mechanical ventilation and no mechanical ventilation, NYHA classes I to IV, and receipt of vasopressors and no vasopressors 29 . A p value < 0.05 was considered statistically significant. All analyses were conducted using SAS software, version 9.4 (SAS Institute, Cary, NC, USA).

Ethical approval and consent to participate. Ethics approval was obtained from the Institutional Review Board of the Ministry of National Guard Health Affairs, Riyadh Saudi Arabia (primary site) and the Institutional Review Boards of the participating centers. Informed consents were obtained from enrolled patients.

Characteristics at baseline. Of The use of pharmacologic thromboprophylaxis did not differ between the two groups at the time of randomization and during the trial, with approximately 80% receiving unfractionated heparin in the two groups at the time of randomization. Therapeutic anticoagulation was used after randomization for reasons other than VTE in 15/133 (11.3%) patients in the IPC group and 15/143 (10.6%) patients in the control group (p = 0.85). The use of antiplatelet therapy and statins was similar in the two groups. Moreover, there were no differences in the frequency and location of central venous catheters. Diagnostic investigations for the different forms of VTE were similar in both groups. Other cointerventions are shown in Table 2 and were generally similar in the two groups except for more frequent use of continuous renal replacement therapy in the IPC group compared with the control group ( Outcomes. Prevalent proximal lower-limb DVT was observed in 8/133 (6.0%) patients in the IPC group and 10/142 (7.0%) patients in the control group (p = 0.73). Among patients with no prevalent DVT, 11/125 (8.8%) patients in the IPC group developed incident proximal lower-limb DVT compared to 6/132 (4.5%) patients in the control group (relative risk, 1.94; 95% confidence interval, 0.74-5.08, p = 0.17) ( Table 3 ). The rate of VTE consisting of prevalent and incident lower-limb DVT and pulmonary embolism was similar in both groups (17.3% in IPC group and 12.7% in control group, p = 0.28).

There was no significant difference in ventilator-free days between the IPC and control groups (21 versus 25 days respectively; p = 0.17). Additionally, there were no differences in pulmonary embolism rate, days to proximal lower-limb DVT, mechanical ventilation duration, and mortality between the IPC and control groups ( Table 3) .

The Kaplan-Meier curves showed no differences in the freedom from incident lower-limb DVT within 28 days (Fig. 1A) and 90-day survival (Fig. 1B) between the IPC and control groups.

The occurrence of incident lower-limb DVT with IPC versus control was not different across NYHA classes (p value for interaction = 0.18), or between patients with left ventricular ejection fraction of < 40% and ≥ 40% (p value for interaction = 0.15, Fig. 2, Panel A) . Similarly, ventilator-free days and 90-day mortality with IPC versus control was not different across NYHA classes (Fig. 2, Panel B) , or between patients with left ventricular ejection fraction of < 40% and ≥ 40% (Fig. 2, Panel C) .

The main findings of this study were that incident lower-limb DVT and ventilator-free days were not different between HF patients who received adjunctive IPC and those who did not. Moreover, the two groups were not different in secondary outcomes including 90-day mortality. There was no heterogeneity in the effect of incidence of DVT, ventilation-free days or 90-day mortality across any of subgroups, including different severities of HF.

VTE rates in hospitalized patients with HF range between 4 and 26% 6 . The largest study that evaluated pharmacologic prophylaxis in patients with HF randomized 3,706 acutely ill medical patients to subcutaneous dalteparin 5000 IU daily or placebo for 14 days 10 . Data on mechanical prophylaxis were not reported 10 . More than 50% (n = 1905) of the enrolled patients had acute congestive HF (NYHA class III or IV) 10 ; in these patients the incidence of VTE, defined as the combination of symptomatic DVT, symptomatic pulmonary embolism, and asymptomatic proximal DVT, was 33 Pneumatic compression prior to randomization-n (%) 24 (18.0) 13 (9.2) 0.03 Table 1 . Baseline characteristics of patients with heart failure who were randomized to intermittent pneumatic compression with pharmacologic thromboprophylaxis (IPC group) or pharmacologic thromboprophylaxis alone (control group). APACHE Acute physiology and chronic health evaluation, ICU Intensive care unit, INR International normalized ratio, IPC Intermittent pneumatic compression, PTT Partial thromboplastin time, Q1 First quartile, Q3 Third quartile, SD Standard deviation, VTE Venous thromboembolism. Table 2 . ICU interventions and co-interventions in patients with heart failure who were randomized to intermittent pneumatic compression with pharmacologic thromboprophylaxis (IPC group) or pharmacologic thromboprophylaxis alone (control group). CT Computed tomography, IPC Intermittent pneumatic compression, LMWH Low molecular weight heparin, PE Pulmonary embolism, Q1 First quartile, Q3 Third quartile, UFH Unfractionated heparin. www.nature.com/scientificreports/ group (relative risk, 0.73; 95% CI, 0.44-1.21) 13 . The patients in this study were not critically ill 13 , which might have made them at lower VTE risk compared to the patients in the current study, in which incident lower-limb DVT occurred in 17/257 (6.6%) critically ill patients with HF. Hence, evaluating combined mechanical and pharmacologic prophylaxis versus pharmacologic prophylaxis is justified. www.nature.com/scientificreports/ IPC prevents DVT mainly by augmenting venous blood flow and reducing hypercoagulability as it stimulates the fibrinolytic activity of vessel walls 37, 38 . The effectiveness of IPC may be negatively altered by the presence of lower limb edema. We found that IPC as an adjunct to pharmacologic thromboprophylaxis was not associated with a reduction in incident VTE, however our trial was not powered to detect a difference across varying severities of HF.

IPC may increase venous blood return and theoretically exacerbate pulmonary edema, which may worsen the outcomes of affected patients. In healthy volunteers, IPC has been shown to increase cardiac output by increasing venous return 39 40 . In a study of 18 healthy patients admitted to ICU postoperatively, venous return increased with no change in cardiac output during the application of IPC 41 . Three small randomized controlled trials observed no HF decompensation with IPC use [26] [27] [28] , however these patients were not critically ill and these studies primarily assessed short-term physiologic changes [26] [27] [28] . In the current study, IPC use was associated with similar ventilator-free days and duration of mechanical ventilation, suggesting that they may not lead to HF exacerbation or have any effect on clinically important outcomes.

The strengths of our study include the multicenter prospective data collection and the predetermined subgroup analysis of a randomized controlled trial. The study is limited by a relatively small sample size, leading to inadequate power to demonstrate statistically significant differences in outcomes. However, data on IPC in critically ill patients with HF are scarce. Other limitations include the classification of HF based on the assessment by clinicians, and the lack of evaluation of direct measures of HF decompensation after the use of IPC, such as the occurrence of pulmonary edema, brain natriuretic peptide levels, and worsening of hypoxia. Our study does not address the question of whether IPC reduces the incidence of DVT in patients with HF who are not receiving pharmacologic prophylaxis.

This predetermined analysis of the PREVENT randomized trial found that among patients with HF who received pharmacologic thromboprophylaxis, the use of IPC versus no IPC was associated with similar rate of incident proximal lower-limb DVT. Moreover, ventilator-free days were similar between groups, suggesting that IPC use may not lead to HF decompensation.

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request. (Panel A) , ventilator-free days (Panel B) and 90-day mortality (Panel C) in selected subgroups of patients with heart failure who were randomized to intermittent pneumatic compression with pharmacologic thromboprophylaxis (IPC group) or pharmacologic thromboprophylaxis alone (control group). The relative risk (RR) is reported for incident lower-limb deep-vein thrombosis and 90-day mortality. The incident rate ratio is reported for the ventilator-free days. The p value for the interaction between treatment and each subgroup is also reported. www.nature.com/scientificreports/

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The authors would like to thank the Saudi Critical Care 

A. made substantial contributions to the acquisition and interpretation of data, and critical review of the manuscript for important intellectual content; J.J. made substantial contributions to the analysis of data, manuscript preparation and critical review for important intellectual content; Y.A. made substantial contributions to conception and design, acquisition and interpretation of data management of the study, and manuscript preparation, drafting and critical review for important intellectual content. All authors read and approved the final manuscript.

The PREVENT trial was funded by King Abdulaziz City for Science and Technology (Grant AT 34-65) and King Abdullah International Medical Research Center (Grant RC12/045/R), both in Riyadh, Saudi Arabia. The funding agencies had no role in study design or conduct, data collection, statistical analysis, or writing of the manuscript.

The authors declare no competing interests.

The online version contains supplementary material available at https:// doi. org/ 10. 1038/ s41598-022-12336-9.Correspondence and requests for materials should be addressed to Y.M.A.

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