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10 Herbal Substances that Aect Hemostasis
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Herbs andHerbal Extracts
most commonly utilized herbs do not appear to result in a bleeding diathesis and are excluded from this discussion.
Due to the global diversity of plants and the propensity of humans in different cultures to explore the possible uses of these plants, there are a very large number of herbs utilized
The following selected herbal preparations were chosen for discussion based on both their propensity to cause bleeding and their popular use (Table10.2).
for a variety of medicinal purposes. At present, many of the
Table 10.2 Herbal supplements, multivitamin and non-herbal vitamin supplements
Herbal supplements
Supplement Marketed uses/Effects Andrographis
Andrographis paniculata
Ashwagandha
Withania somnifera
Boswellia
Boswellia serrata
Bromelain Bromeliaceae spp.
Cannabinoids Cannabis spp.
Cranberry
Vaccinium macrocarpon
Danshen
Salvia miltiorrhiza
Devil’s Claw
Harpagophytum procumbens
Dong Quai
Angelicae sinensis
Evening Primrose Oil
Oenothera biennis
Fenugreek
Trigonella foenum-graecum
Feverfew
Tanacetum parthenium
Garlic
Allium sativum
Ginger
Zingiber ofcinale
Ginkgo
Ginkgo biloba
Ginseng Panax spp.
Immunostimulatory, antiviral, antibacterial, anti-inammatory, antitumor, antidiabetic, antimalarial, hepatoprotective, cardiovascular disease, infertility Anti-arthritic, antirheumatic, anti-inammatory Inhibition of platelet
Osteoarthritis, rheumatoid arthritis, inammatory bowel disease, asthma Anti-edema, anti-inammatory, antithrombotic, brinolytic
Multiple sclerosis, chronic pain, nausea/vomiting, others
Improve urinary tract infection, metabolic prole, antioxidant
Atherosclerosis, hypercholesterolemia, arthritis, insomnia, menstrual disorders
Analgesic, antipyretic COX-1 and COX-2 inhibition
Menstrual cramping, menstrual regulation, migraine, antispasmodic Anti-inammatory, women’s health conditions Antiplatelet effects, coumarin
Increase milk production, antidiabetes, anticancer, anticholesterol, antioxidant, anti-inammatory, antimicrobial, hepato- and neuro-protective Fever, migraine, rheumatoid arthritis, menstrual problems
Atherosclerosis, hypertension, thrombus formation, and lower serum lipid and cholesterol levels
Arthritis, rheumatism, muscular aches, pains, sore throats, cramps, constipation, indigestion, nausea, vomiting, motion sickness, hypertension, dementia, fever, infectious diseases, helminthiasis Cognitive disorders, peripheral vascular disease, erectile dysfunction Improve energy and alertness, aphrodisiac, diabetic blood sugar control
Anticoagulant/Antiplatelet effect
Inhibits PAF-induced platelet aggregation
aggregation Prolongs PT and aPTT, inhibition of Factor Xa and XIa Inhibition of ADP-induced platelet aggregation, reduced platelet endothelial adhesion, prolongs PT and PTT CBN and THC inhibit thrombin-induced clot formation, prolong clotting times Component compounds inhibit platelets, no data supporting cranberry juice itself inhibiting platelets Inhibits ADP-induced platelet aggregation, thrombosis formation
Inhibits platelet aggregation May potentiate warfarin
constituents Contains Vitamin K antagonist coumarins
Reduced ADP-induced platelet aggregation, decreased COX production Inhibit platelet aggregation invivo in dose-dependent fashion
Inhibit AA-induced human platelet serotonin release and aggregation
Inhibition of PAF-induced platelet aggregation Inhibits invitro thromboxane synthesis, increased blood clotting time, PAF inhibition
Drug interactions (if known)/ Miscellaneous
Chemical burn debridement agent
CBD may increase warfarin concentrations
Increased INR in those taking warfarin
Signicantly increases concentrations of warfarin
effect May potentiate warfarin effect Should be avoided in those taking warfarin
Warfarin use increases bleeding risk, rich in sulfur-containing compounds allicin and alliin –
Increased warfarin clearance
(continued)
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Table 10.2 (continued)
Herbal supplements
Supplement Marketed uses/Effects Green Tea
Camelia sinensis
Hawthorn Crataegus spp.
Horse Chestnut
Aesculus hippocastanum
Kava
Piper methysticum
Motherwort
Leonurus japonicus
Oregano
Origanum vulgare
Policosanol Cardiovascular benets, claudication pain relief Reduces AA, collagen and
Resveratrol Anti-inammatory, anticancer, anti-Alzheimer’s,
Saw Palmetto
Serenoa repens
Skullcap
Scutellaria baicalensis
St. John’s Wort
Hypericum perforatum
Turmeric
Curcuma longa
Willow Bark
Salix alba
Wintergreen Oil (methyl salicylate) Multivitamins and non-herbal vitamin supplements Coenzyme Q10 Cardiovascular benet, possibly improve liver,
Fish Oil (omega-3 long chain fatty acids) Glucosamine/ Chondroitin Sulfate Vitamin E Antioxidant, anti-atherosclerosis, cancer prevention Antagonizes Vitamin K effect
Others: Magnesium, Lycopene, Selenium, Taurine
Cardiovascular benets, antioxidant, anti­inammatory, antidiabetic, antiviral
Digestive disorders, gall bladder disease, asthma Inhibition of ADP-induced
Chronic venous insufciency, hemorrhoids, anti-inammatory, antioxidant, anti-edema
Anxiolytic, sedative Inhibits COX, Dose-dependent
Menstrual disorders, blood stasis, analgesia Inhibition of ADP-induced
Respiratory and gastrointestinal disorders, others Prolongs aPTT
antidiabetes
Benign prostatic hypertrophy, anti-inammatory Inhibits COX
Antioxidant, antibacterial, antiviral, antitumor, others Prolongs aPTT, PT, inhibits
Depression, anxiety, sleep disturbances CYP3A4 isoenzyme induction Decreased warfarin efcacy,
Skin conditions, respiratory illness, analgesic, liver dysfunction Anti-inammatory, analgesic, antirheumatic, antipyretic Arthralgia, skin irritation Structurally similar to aspirin Elevated INR when
muscle, and brain health Cardiovascular benets May decrease ADP-induced
Cartilage health in osteoarthritis Glucosamine inhibits ADP-
Various May inhibit platelet function Selenium may increase
Anticoagulant/Antiplatelet effect
Inhibits AA, collagen, and ADP-induced platelet aggregation
platelet aggregation, reduction in thromboxane A2 biosynthesis Inhibits ADP-induced platelet aggregation, arterial and venous contraction mediated by 5HT(2A) receptor
decrease in platelet aggregation
platelet aggregation
ADP-induced platelet aggregation
Increases platelet NO, inhibits PAI-1
brin polymerization and platelet aggregation
Inhibition of ADP and GPVI­induced platelet aggregation Inhibits AA-induced platelet aggregation
Possible elevated bleeding
platelet aggregation and prolong bleeding time
induced platelet activation
and inhibit thrombin-induced platelet aggregation
Drug interactions (if known)/ Miscellaneous
Contains Vitamin K, may decrease warfarin effect
Plant contains esculin, a poison that can cause death if eaten raw
May result in liver toxicity
Increases effect of omega-3 fatty acids and aspirin, extracted from sugar cane and beeswax plants May partially explain cardiovascular effects of wine consumption
Healing effects are described in the oldest Chinese medicinal book in existence
enhances clopidogrel efcacy
Contains precursor to salicylic acid
combined with warfarin
risk if taking warfarin Bleeding risk elevated in those also taking warfarin or aspirin/NSAIDS May increase INR in those taking warfarin Bleeding risk may be elevated if dose is high or taking anticoagulants
warfarin activity
Andrographis
The herbaceous plant Andrographis paniculata has many pharmacological effects which could be used for a number of disease states including protection from cardiovascular disease, infertility, and potentially many others. It contains
the herbal compound andrographolide which is shown to inhibit platelet-activating factor (PAF)-induced human platelet aggregation in a dose-dependent manner and exhib­its antiplatelet activity through other molecular mecha­nisms [28].
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Ashwagandha
Ashwagandha is an important Indian medicinal plant which may have anti-arthritic, antirheumatic, anti-inammatory, and other properties. Extracts are shown to have some inhibi­tory effects on platelet aggregation [29].
Boswellia
Boswellia serrata, or Indian frankincense, is classically used as an anti-inammatory agent for the treatment of arthritis. There is evidence of substantial antithrombotic properties from the extract causing prolonged prothrombin time (PT) and activated partial thromboplastin time (aPTT) that appears linked directly to Factor Xa and XIa inhibition [30].
Bromelain
Bromelain extract is produced from pineapples and confers anti-edema, anti-inammatory, antithrombotic, and brino­lytic activities. It contains a number of proteases which may prevent adenosine diphosphate (ADP)-induced platelet aggregation and adhesion of platelets to blood vessel endo­thelial cells. In high doses, it may also prolong the PT and partial thromboplastin time (PTT). It may be utilized clini­cally as a chemical burn debridement or anti-edema agent and has not yet had a reported occurrence of the adverse effect of bleeding in humans [31].
Cannabinoids
Cannabis extract is used as a therapy for multiple sclerosis, chronic pain, nausea/vomiting, and others. Cannabinol (CBN) and tetrahydrocannabinol (THC) appear to inhibit thrombin-induced clot formation invitro and prolong clot­ting times invivo in a rat model [32]. Another component, cannabidiol (CBD), inhibits P450 (CYP) 3A enzymes (and other isoenzymes), and it may decrease the metabolism of warfarin as a result [33].
Cranberry
Cranberry juice or supplements are taken to improve urinary tract infections, improve metabolic prole, and as an antioxi­dant. Clinical data do not currently report cranberry having an effect on platelet aggregation, despite several of its com­ponents having been shown to do so [34]. Case reports dem­onstrate an interaction between cranberry and warfarin resulting in an elevated international normalized ratio (INR) [35, 36].
Danshen
Danshen is an herb used for centuries to improve cardiovas­cular health. An extract contacting several constituents has been shown to inhibit thrombosis formation and platelet aggregation [37]. At least one active component of Danshen inhibits platelet aggregation induced by ADP [38]. Danshen
enhances anticoagulation in patients taking warfarin by directly increasing plasma concentrations of warfarin [
39].
Devil’s Claw
Devil’s Claw is a plant of the sesame family used as an anal­gesic and anti-pyretic. The active ingredient harpagoside has been implicated in previous invitro studies that show altered platelet function [40]. Further studies have conrmed that cyclooxygenase (COX)-1 and COX-2 inhibition by this active ingredient are likely responsible [41]. The clinical implication of this remains questionable.
Dong Quai
Dong quai is an ancient Chinese herbal medication which is taken largely for its benets with menstrual cramping, menstrual regulation, and migraine headache. It has also been used as an antispasmodic [42]. It possesses several constituents which are known to decrease platelet aggrega­tion by inhibiting thromboxane A study supports this action in select patients [43, 44]. A case report suggests dong quai may potentiate the effect of war­farin [42].
synthesis and a clinical
2
Evening Primrose Oil
Evening primrose oil originates from the evening primrose plant and is used as an anti-inammatory and in women’s health conditions. It is postulated to have antiplatelet effects and contains coumarin constituents which could lead to an interaction with warfarin [45, 46].
Fenugreek
Fenugreek is an ancient herbal which possesses many vita­mins and active compounds which have been used for the treatment of increasing milk production, diabetes, cancer, and hypercholesterolemia. It possesses antioxidant, anti­inammatory, antimicrobial, and hepato- and neuro­protective properties [47]. Fenugreek contains a high content of coumarin-like compounds which can lead to increased risk of bleeding. Excessive intake of fenugreek has been shown to cause a Vitamin K reversible prolongation of INR with coagulation failure in a susceptible patient. It may be advisable to avoid this medication in patients taking warfarin [48].
Feverfew
Feverfew has classically been used as an antipyretic and in the treatment of migraines. Feverfew’s active constituent of sesquiterpene lactones is suspected to be responsible for its effect on platelets. The primary effect is a reduction in ADP­mediated platelet aggregation [49]. It has also been shown to decrease COX production leading to reduction in thrombox­ane synthesis [50].
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Garlic
Garlic is a plant bulb and species of the onion family that is well known for its culinary applications, but it has also been used medicinally for several millenia. Today, it is used prin­cipally for the treatment of atherosclerosis, hypertension, thrombus formation, and to lower serum lipid and choles­terol levels [51]. Primary chemical components of garlic, ajoene and volatile oil, have been implicated in irreversibly potentiating platelet inhibitors, including prostacyclin, indo­methacin, and dipyridamole [52]. Garlic reportedly inhibits platelet aggregation invivo in a dose-dependent fashion [53,
54], mainly through the effects of sulfur-containing com-
pounds alliin and allicin which inhibit the production and release of thromboxane and adenosine [55]. However, these antiplatelet results have not been reproducible in all clinical trials [5658]. Some studies report that aged garlic extract has been found to signicantly reduce adrenaline-induced platelet aggregation and to a lesser extent collagen-induced platelet aggregation, with no effect on ADP-induced platelet aggregation [59, 60]. There are several cases in the literature of excessive dietary garlic intake or use of garlic as a medi­cine associated with coagulation alterations [61]. One case report describes an elevated INR, reportedly due to an inter­action between garlic and warfarin [62]. At recommended doses, it appears that garlic supplements do not have antico­agulant properties in individuals not taking concomitant anticoagulant medications. However, when consumed in higher than recommended doses or when used in combina­tion with anticoagulants, garlic may be a factor for increased risk of bleeding.
Ginger
Ginger is the rhizome of the Zingiber ofcinale plant with widespread uses ranging from the treatment of arthritis and inammatory conditions to hypertension and dementia. It is commonly utilized in the treatment of nausea and gastroin­testinal discomfort [63, 64]. Gingerols are the key active component of ginger and have been shown to inhibit arachi­donic acid (AA)-induced human platelet serotonin release and aggregation [65]. In vitro studies have also shown COX-1 inhibition leading to antiplatelet activity more potent than aspirin alone [66]. Despite these ndings, further experiments have failed to demonstrate signicant changes in clotting status or coagulation in individuals taking warfa­rin [67].
Ginkgo
Ginkgo biloba is marketed for improvement in peripheral vascular disease, erectile dysfunction, and has gained trac­tion for Alzheimer’s disease and multi-infarct dementia treatment. Ginkgolides are one of the more widely studied active ingredients and have been shown to have dose-
dependent, rapid onset, potent inhibition of PAF-induced platelet aggregation [68]. Several case reports exist implicat­ing gingko as the cause of unexpected hemorrhage in the perioperative period including unprovoked intracranial hem­orrhage [69, 70].
Ginseng
Ginseng (Panax ginseng) has a long history of use in eastern Asian culture to boost the immune system. Today, it is a prominent additive to energy drinks for increased alertness and focus [71]. One of ginseng’s bioactive component, gen­sinosides, seems to be responsible for anticoagulation effects and may reduce platelet volume through PAF inhibition. Ginseng has also been shown to inhibit invitro thromboxane synthesis and lead to increased blood clotting time [72]. Despite the effective inhibition of the coagulation cascade, a clinical trial showed that warfarin clearance was increased with concomitant use of ginseng, leading to less effective anticoagulation as shown by a corresponding difculty in achieving the desired therapeutic INR [73].
Green Tea
Green Tea, the second most consumed beverage in the world, has many purported benets including improved cardiovas­cular health, antioxidant, anti-inammatory, antidiabetic, and antiviral effects [27, 42]. Components of green tea, including polyphenols and catechins, have been shown to inhibit AA, collagen, and ADP-induced platelet aggregation [74]. In vivo studies have supported this with signicantly prolonged bleeding time in conscious mice after green tea and catechin administration [75]. Additionally, Vitamin K is present in green tea in a signicant quantity and may decrease the anticoagulant effect of warfarin [34].
Hawthorn
Hawthorn is classically used for gastrointestinal disorder treatment. There are many active ingredients in hawthorn and some interact with platelet function. In vitro studies have shown that hawthorn extract and inhibits ADP-induced platelet aggregation and causes a signicant reduction in bio­synthesis of thromboxane A2 [76].
Horse Chestnut
Horse chestnut is an herbal medication historically taken for chronic venous insufciency and is purported to have anti­inammatory, antioxidant, and anti-edema properties. Extracts have been shown to inhibit ADP-induced human platelet aggregation and cause contraction of both veins and arteries [77]. One clinical study has shown it is as effective as compression stockings in chronic venous insufciency. The potential for drug interactions with other antiplatelet drugs needs further study [74].
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Kava
Kava is a substance with predominantly psychomotor activities and is used as an anxiolytic and sedative. It inhib­its COX with a similar potency to nonsteroidal anti-inam­matory drugs (NSAIDS), causes a dose-dependent decrease in platelet aggregation and may also cause hepatotoxicity [78].
Motherwort
Motherwort is classically used to treat menstrual disorders such as amenorrhea and dysmenorrhea but applications extend to other conditions of blood stasis and analgesia. Studies have shown decreased platelet aggregation after intravenous administration [79]. Further invitro studies have isolated an active ingredient bis-spirolabdane diterpenoid that has the ability to signicantly reduce ADP-induced platelet aggregation [80].
Oregano
Oregano is an herbal supplement purportedly utilized for respiratory disorders, gastrointestinal disorders, and many others and has been shown to prolong aPTT in an invitro study [81].
Policosanol
Policosanol is taken for its purported ability to improve lipid prole and for its cardiovascular health benets, policosanol is shown to inhibit platelet aggregation response to AA, col­lagen, and ADP [82]. It seems to have an additive antiplatelet effect when taken along with aspirin and omega-3 fatty acids, though no reports have identied policosanol as a contribu­tor to clinical bleeding [83, 84].
Resveratrol
Resveratrol is a phenolic antioxidant present in grape skin, which may explain part of the benecial cardiovascular effects of wine consumption. The compound increases the production of nitric oxide (NO) by stimulated platelets and, thus, blunts platelet function through inhibition of the pro­inammatory pathway [85]. It also decreases plasminogen activator inhibitor-1 (PAI-1) which may increase a patient’s brinolytic state [86]. Case reports of clinically signicant bleeding due to resveratrol are lacking.
Saw Palmetto
Saw palmetto is a commonly used herbal supplement which improves symptoms of benign prostatic hypertrophy [87]. Presumably through its ability to inhibit COX, it has been implicated in a case report of reported severe bleeding during craniotomy, as well as a cause of hematuria and coagulopa­thy [27]. The true clinical impact on coagulation remains unclear.
Skullcap
Skullcap is a traditional Chinese herbal medicine with many purported medicinal benets, perhaps most notably as an antioxidant, antibacterial, antiviral, and antitumor agent. It is a component of dozens of Chinese medicinal preparations and its constituents are being widely researched to dene medicinal benets [88]. One of its major components, orox­ylin A, is shown to prolong the aPTT and PT, inhibit brin polymerization, and platelet aggregation [89].
St. John’s Wort
St. John’s wort is a widely used supplement, particularly in the treatment of depression, anxiety, and sleep disturbances. Most of the effects on coagulation come through potent cytochrome isoenzyme modulation. St. John’s wort reduces plasma warfa­rin concentrations through induction of CYP3A4 and possibly other CYP isoforms because warfarin, which exists as a race­mic mixture of R- and S-enantiomers, is metabolized by CYP1A1 and CYP3A4 (R-warfarin) and CYP2C9 (S-warfarin). Such interactions have been conrmed in clini­cal trials showing decreased plasma concentrations of warfa­rin and phenprocoumon [90]. In contrast, the efcacy of clopidogrel is enhanced with coadministration of St. John’s wort. The induction of CYP3A4 enhances conversion of the prodrug clopidogrel to its active form resulting in demonstra­ble decreases in ADP-induced platelet aggregation [91].
Turmeric
Turmeric is a commonly used spice in cooking on the Indian subcontinent and particularly in curry dishes, but it is also marketed as a treatment for aches, respiratory conditions, skin conditions, and liver dysfunction [92]. Curcumin has been identied as the active ingredient with anti- inammatory properties and data are limited on its effect on platelet func­tion. In vitro studies have found evidence of ADP and glyco­protein VI inhibition leading to reduced platelet aggregation [93, 94]. Despite the demonstrated invitro platelet inhibitory effects, clinical data to investigate and substantiate this effect invivo are lacking [34].
Willow Bark
Willow tree bark extract is an ancient supplement historically utilized for the treatment of inammation and additionally is an analgesic, antirheumatic, and antipyretic substance. The primary pharmacologically active compound is salicin, which once oxidized becomes salicylic acid [34]. In a double­blinded, randomized controlled trial of 35 patients receiving willow bark extract or placebo and 16 patients receiving ace­tylsalicylate, willow bark extract was shown to have a statisti­cally signicant inhibition of AA-induced platelet aggregation compared to placebo. However, this inhibition was not as great as those who had received acetylsalicylate [95].
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Wintergreen Oil
Wintergreen oil, or methyl salicyclate, is most commonly used as a topical ointment for the treatment of arthritis and other skin irritation. The active compound methyl salicyclate is structurally very similar to aspirin and even topical absorp­tion can lead to substantial blood concentrations. Several cases of increased INR have been reported when wintergreen is used by patients on a stable warfarin regimen [96, 97].
Numerous other herbal compounds may have some effect on blood coagulation. Berberine has been shown in an invitro study to inhibit thrombin-induced platelet aggre­gation as a direct thrombin inhibitor [98]. Boldo may have interactions with warfarin causing increased INR [99]. Chinese Peony has been reported to have anticoagulant properties. Analysis of extracts reveal chemical structural similarities to animal heparin [100]. Corydalis yanhusuo has been shown to inhibit platelet aggregation [101]. Cyanidin-3-Glucoside is a plant-based anthocyanin that is shown to inhibit platelet function at multiple points includ­ing platelet activation, aggregation, secretion, and throm­bus formation [102]. Persimmon leaf ethanol extract is shown to prolong aPTT and inhibit platelet activation, while ethanol extract of persimmon leaf and Citrus junos (Yuzu) prolongs aPTT and PT in mice [103, 104]. Poncitrin is often taken for gastrointestinal problems, contains cou­marin compounds, and has been shown to inhibit the aggre­gation of rabbit platelets induced by ADP, PAF, AA, and collagen [105]. Piper wallichii possesses compounds which inhibit platelet aggregation induced by PAF [106]. Rhus verniciua stokes is a traditional herbal supplement which decreases platelet aggregation to collagen in vivo [107]. Safower extract and some of its components have signi­cant antiplatelet and anticoagulation activity [108]. Of note, a number of herbals contain a large amount of vitamin K and may decrease the effectiveness of warfarin, includ­ing stinging nettle (Urtica dioica), noni fruit (Morinda
citrifolia), dandelion (Taraxacum ofcinale), and horsetail (Equisetum arvense) [109].
When multiple supplements that have been identied as inhibiting coagulation or platelet function are taken together, this will likely further increase the risk of perioperative bleed­ing [110]. Traditional herbal preparations are often prepared as combination herbal supplements which are shown to pos­sess antithrombotic and antiplatelet effects [111]. For instance, treatment of rats with reduction of Sheng-Nao- Kang decoction, comprised of six herbal components, prolongs aPTT, PT, thrombin time, and decreases brinogen [112].
Multivitamins andVitamin Supplements
Multivitamins/minerals, calcium, and individual vitamins (B, D, C, E) are among the most common nutritional supple-
ments people take [ potential bleeding concerns in the perioperative setting (Table10.2).
21]. Clinicians should be aware of their
Coenzyme Q10
Coenzyme Q10 supplementation may have cardiovascular benets and may provide some benet to liver, muscle, and brain health. It does not appear to increase bleeding when taken in isolation [71]. Coenzyme Q10 has a complex inter­action with warfarin. It appears to increase the clearance of both R- and S-enantiomers of warfarin without decreasing the therapeutic effects of warfarin. Coadministration of war­farin and coenzyme Q10 may lead to a mild increased risk of bleeding in patients taking warfarin, though this interaction is poorly understood and lacks denitive support [27].
Fish Oil
Omega-3 fatty acids are found naturally in certain sh and these supplements are typically taken for their purported car­diovascular benets. Ingestion of supplemental omega 3 long-chain polyunsaturated fatty acid reduces risk for myo­cardial infarction and coronary artery disease at 1g/day, per­haps even more importantly for those with low sh intake [3]. Standard dosage of sh oil has recently been shown to decrease platelet aggregation and clot formation when assessed by multiplate aggregometry and viscoelastic rota­tional thromboelastometry [113]. Other studies reporting a decrease in platelet aggregation and a prolonged bleeding time are reported, though, sh oil alone did not appreciably cause abnormal surgical bleeding or abnormal bleeding time or platelet aggregation [71]. Bleeding time appears to be increased when this supplement is taken concurrently with warfarin or aspirin/NSAIDS [27].
Glucosamine/Chondroitin Sulfate
Often taken concurrently, glucosamine and chondroitin sul­fate supplements are utilized for the improvement of cartilage health for those with osteoarthritis. Interestingly, chondroitin shares a similar glycosaminoglycan structural makeup with heparin [114]. Glucosamine is shown to reduce platelet func­tion via inhibition of ADP-induced platelet activation in humans [115]. In isolation, these supplements have not been convincingly shown to increase clinical bleeding. The use of glucosamine or glucosamine-chondroitin sulfate with warfa­rin may result in increased INR and bruising [116].
Vitamin E
Vitamin E supplements are purported to provide antioxidant and anti-atherosclerosis benet as well as cancer prevention [114]. Vitamin E may antagonize the effect of Vitamin K and inhibit the production of Vitamin K-dependent factors, although this typically occurs only at high doses [117]. Vitamin E has been shown to inhibit the intrinsic coagulation
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pathway and may inhibit platelet aggregation and adhesion in patients with thrombocytopenia or diabetes [118]. In vitro reports and several clinical studies suggest a signicant increase in bleeding risk due to Vitamin E-induced inhibition of platelet aggregation or interaction with aspirin or warfa­rin, though subsequent clinical studies have been unable to consistently replicate these results. Thus, any anticoagulant effects of Vitamin E may be dose-dependent and there may be elevated bleeding risk if they are co-administered with anticoagulants [27, 114].
Others
Magnesium, lycopene, selenium, and taurine may inhibit platelet function [71, 118]. Selenium may increase warfarin activity as shown in an animal model, possibly by displacing warfarin from albumin [119].
Supplement Interaction withPrescription Medication
One mechanism of nutritional supplement-associated hem­orrhage is related to interaction with prescription medica­tions. Perhaps the best studied prescription medication with such a risk is warfarin [34]. In general, the use of any previ­ously mentioned nutritional supplement which indepen­dently exhibits an antiplatelet or anticoagulant effect, along with a pharmaceutical with antiplatelet or anticoagulant effects, should be expected to increase the risk of periopera­tive hemorrhage.
Perioperative Considerations
Routine questioning of patients about nutritional supplement usage is both reasonable and practical. Recommendations by several societies and care groups have been reported regard­ing the suggested time to avoid taking nutritional supple­ments in anticipation of surgery. These recommendations are limited by the clinical data available and should not replace clinical judgment in different patient care scenarios. The American Society of Anesthesiologists has previously rec­ommended discontinuation of all herbal medications 2–3weeks before an elective surgical procedure [120]. The Swedish Medical Products Agency recommends the discon­tinuation of some of the most commonly taken naturopathic medicines 2weeks prior to surgery [113]. Dental profession­als suggest discontinuation of herbal supplements 14 days prior to receiving invasive surgical procedures, though sup­plements may not need to be held prior to routine dental and dental hygiene procedures [121]. Others suggest discontinu­ation of any supplement around 15days before an elective urologic extracorporeal shockwave lithotripsy procedure
[122]. This seems prudent given ongoing effects of some herbals even at 14 days after administration [123]. The American Society of Regional Anesthesia and Pain Medicine has published updated guidelines addressing the risks of bleeding-related complications associated with regional anesthesia in patients receiving any antithrombotic or throm­bolytic therapy. The authors recommend against required discontinuation of herbal supplements prior to neuraxial pro­cedures and that regional anesthesia should not be withheld in those patients using these therapies. There is not a need to cancel a surgery or procedure if patients have not already discontinued these supplements [124].
Until more rigorous scientic studies related to bleeding risks associated with herbal medications and supplements exists, 2weeks seems to be both a reasonable and consensus time period for discontinuing herbal medications prior to elective surgery. In isolated circumstances, such as prior to urgent or emergent surgery where bleeding poses a risk, it may be prudent to investigate the effects of a patient’s nutri­tional supplements with standard coagulation tests in order to guide treatment for hemorrhage.
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