Review Article

Anti-Inflammatory Effects of Heparin and Its Derivatives: A Systematic Review

Table 1

Summary and findings of common studied diseases.

Clinical settingHeparin preparationMode of administrationComparatorNumber of patientsClinical outcomeLaboratory outcomeStudy design

Exercise-induced Asthma [9]UFH InhalerCromolyn sodium or placebo12Significantly reduction of exercise-induced asthmaHeparin had no effect on histamine-induced bronchoconstrictionSingle-blind, randomized, crossover clinical trial

Asthma [10]UFH InhalerPlacebo8Significant reduction of late asthmatic response after allergen administration (: 0.005)Randomized, double-blind, crossover clinical trial

Atopic asthma [11]Heparin (IVX-0142) NebulizerPlacebo19No significant decrease in early (: 0.06) and late (: 0.24) asthmatic responseRandomized single-blind, placebo-controlled, crossover trial

Asthma [12]LMWH Nebulizer24Effective as an add-on therapy to standard treatmentReduction in eosinophil (: 0.0006) and lymphocyte (: 0.049) in bronchoalveolar lavage. No changes in IL-5 or ECP concentrations in serumQuasi-experimental (pretest-posttest design)

Allergic asthma [13]UFH InhalerPlacebo25Heparin inhalation significantly reduced bronchial hyperreactivity ()Randomized, double-blind, placebo-controlled, crossover trial

Asthma [14]UFH Inhaler12Transient (time-dependent) inhibitory role in allergic reactionsIncreased the methacholine PC20 value (: 0.05) but did not prevent an increase in Raw and/or a decrease in SGAWRandomized, double-blind, placebo-controlled, crossover trial

Asthma (children) [15]UFH InhalerPlacebo14Single dose of heparin significantly (: 0.005) reduced bronchial hyperreactivityProvocation test used leukotriene D4Randomized, double-blind, placebo-controlled, crossover trial

Asthma [16]UFH InhalerPlacebo23Significant reduction of bronchial hyperreactivity to histamine and leukotrieneRandomized, double-blind, placebo controlled, crossover trial

IBD [17]UFHIV/SCHydrocortisone + prednisolone20 (12 in control group)Clinical activity index, stool frequency, and endoscopic and histopathological grading were similar in both treatment groupsCRP and α1 acid glycoprotein did not changeOpen label randomized, crossover clinical trial

IBD [18]UFHSC17Histology improved significantly in ulcerative colitis patients (UFH is effective in ulcerative colitis but not Crohn disease)CRP (: 0.0119) and ESR (: 0.0096) significantly reduced in ulcerative colitis but not Crohn diseaseQuasi-experimental (pretest-posttest design)

IBD [19] UFHIVMethyl prednisolone25 (13 in control group)No effect of heparin, also increased bleedingNo change in CRPRandomized, double-blind, parallel-group trial

IBD [20]Enoxaparin + standard treatmentSCAminosalicylate + corticosteroid34 (18 in control group)Significant improvement in disease severity in both groups (: 0.001)No difference ESR, CRP and fibrinogen and coagulationRandomized controlled trial

IBD [21]NadroparinSC25Endoscopic and histological sign of inflammation significantly improvedQuasi-experimental (Non-randomized clinical trial)

Cataract surgery [22] UFHIntraocular lens (IOL)Polymethylmethacrylate524Heparin surface modification reduced the cellular deposit compared to control groupRandomized, double-blind, parallel group clinical trial

Cataract surgery [23] UFHIntraocular lens (IOL)Polymethylmethacrylate58 (31 in control group)Postoperative inflammation decreased significantly in heparin group (: 0.02)Giant cell and cell deposit decreased significantly ()Randomized, double-blind, clinical trial

Cataract surgery (pediatric) [24]UFHIrrigationBalanced salt solution33 (19 in control group)Heparin irrigation reduced number of postoperative inflammatory related complicationAnterior chamber reaction including fibrin formation was lower in heparin groupRandomized prospective double-blind trial

Cataract surgery (pediatrics) [25]EnoxaparinIrrigationNo treatment40 (20 in each group)Increase of flare and cell deposit after surgery (1 and 3 months) (: 0.99)Increase in large cell depositsRandomized, double-blind, controlled trial

Cataract surgery [26]UFHIrrigationRegular irrigation solution72Significant reduction of inflammation in the early (days 1–3) postoperative period ()Randomized controlled trial

Cardiopulmonary bypass (pediatric) [27]Heparin-coated circuit ()Non-heparin-coated circuit ()21Decrease of systemic inflammatory response with the use of heparin-bonded oxygenatorsSignificantly decreased levels of IL-6, IL-8, terminal complement complex, neutrophils, and elastase in heparin coated circuitRandomized controlled trial

Cardiopulmonary bypass [28]Heparin-coated circuit ± aprotininUncoated circuit ± aprotinin200 (4 groups)Aprotinin and heparin had no effect on cytokine releaseTNF-α, IL-6, and IL-8 and myeloperoxidase did not change Randomized, double-blind, clinical trial

Cardiopulmonary bypass [29]UFH Uncoated circuit51 (26 in each group)Decreased pulmonary vascular resistance index and pulmonary shunt fraction, and increased PaO2/FIO2 ratioLower levels of phospholipase A2 and complement activation (: 0.001)Randomized, double-blind, clinical trial

Cardiopulmonary bypass [30]Heparin-coated circuit Non-heparin-coated circuit 16 (9 in control group)No significant difference between groups regarding: granulocyte elastase IL-6, IL-8Quasi-experimental (pretest-posttest design)

Cardiopulmonary bypass [31]Heparin concentration-based systemActivated clotting time-based management200 (100 in control group)No effect on postoperative blood lossSignificant reduction of neutrophil activation and fibrinolysis and thrombin generation ()Randomized controlled trial

Cardiopulmonary bypass (pediatric) [32]Heparin-coated circuit Non-heparin-coated circuit 19 (10 in control group)Improvement of the biocompatibility of CPB during heart surgery Levels of complement factor C3a () and IL-6 (: 0.005) significantly reduced in heparin-coated circuitRandomized controlled trial

Cardiopulmonary bypass (pediatric) [33]Heparin-coated circuit Non-heparin-coated circuit 34 (12 in control group)No differences in duration of intubation, intensive care unit or hospital stay, or postoperative blood lossIL-6, IL-8, and TNF-α were significantly lower in heparin group (, , and , resp.)Randomized controlled trial

Cardiopulmonary bypass [34]Heparin-coated circuit (heparin + aprotinin)Non-heparin-coated circuit (heparin + aprotinin)30 (15 in each group)No significant differences between the two groups in terms of bleeding and transfusional requirements, the time spent on a ventilator, or in duration of stay in the intensive care unit (ICU)Levels of IL-6, CRP, and neutrophil count did not change by heparin-coated circuit. Monocyte count increased in heparin-coated circuitRandomized controlled trial

Coronary artery bypass grafting (CABG) [35]Heparin-coated circuit Non-heparin-coated circuit 18 (9 in each group)Reduction of levels of IL-8 and TNF-α and increase of neutrophil elastaseRandomized controlled trial

CRP: C-Reactive Protein, CPB: Cardio Pulmonary Bypass, ECP: Eosinophil Cationic Protein, ESR: Erythrocyte Sedimentation, ICU: Intensive Care Unit, IL: interleukin, IV: intravenous, SC: subcutaneous, SGAW: Specific Airway Conductance, TNF: Tumor Necrosis Factor, and UFH: unfractionated heparin.