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. 2022 Feb 23;149(3):774–787. doi: 10.1097/PRS.0000000000008884

Safety and Efficacy of Local Tranexamic Acid for the Prevention of Surgical Bleeding in Soft-Tissue Surgery: A Review of the Literature and Recommendations for Plastic Surgery

Kjersti Ausen 1,, Reidar Fossmark 1, Olav Spigset 1, Hilde Pleym 1
PMCID: PMC8860217  PMID: 35196701

Abstract

Background:

Although high-bleed surgery routinely utilizes the antifibrinolytic drug tranexamic acid, most plastic surgical procedures are conducted in soft tissue with low-volume bleeding. Unease regarding possible systemic adverse effects prevents widespread systemic use, but local use of tranexamic acid is gaining popularity among plastic surgeons. Randomized controlled trials on topical use of tranexamic acid are mainly from high-bleed surgeries, and few studies address the effect in soft tissue. This article reviews the scientific evidence regarding local use of tranexamic acid in soft-tissue surgery, discusses pharmacological effects and possible adverse reactions, and presents recommendations for use in plastic surgery.

Methods:

A systematic search of databases for studies on local use of tranexamic acid in soft-tissue surgery was performed. Randomized controlled trials were included for a systematic review on effect; a narrative review regarding other clinically relevant aspects is based on extensive literature searches combined with the authors’ own research.

Results:

Fourteen randomized controlled trials, including 1923 patients, were included in the systematic review on local use of tranexamic acid in soft-tissue surgery.

Conclusions:

Local use of tranexamic acid may reduce blood loss comparably to intravenous prophylactic use with negligible risk of systemic adverse effects, but high-quality randomized controlled trials are few. Prolonged exposure to high local concentrations is discouraged, and direct contact with the central nervous system may cause seizures. No single superior means of administration or dosage is supported in the literature, and lowest effective dose is unknown. There may not be one single ideal dosing regimen, but rather many possibilities adaptable for different surgical situations.


Although most plastic surgical procedures are not associated with major blood loss, bleeding causes swelling, bruising and pain, need for drains and bandage changes, and reoperations, and may increase the risk of infection and wound ruptures. Keeping surgical bleeding to a minimum is, thus, beneficial for both patient and provider. Fear of bleeding may also prevent plastic surgeons from using adequate thromboprophylactic measures as addressed by the American Society of Plastic Surgeons Venous Thromboembolism Prevention Task Force.1

In surgery, a balance between coagulation and fibrinolysis is needed to prevent bleeding yet maintain circulation. If fibrinolysis exceeds coagulation, bleeding may occur despite adequately performed hemostasis. While meticulous surgical technique, use of cautery, and local infiltration of wound edges with adrenaline can largely control bleeding in soft-tissue surgery, bony tissue cannot be infiltrated or manipulated to the same extent. Measures such as hypotensive anesthesia and pharmacological aids are, therefore, used to control bleeding in bony tissue.

Antifibrinolytic drugs have been the only available pharmacological means of a general reduction of bleeding with an acceptable safety profile in patients without coagulation deficiencies.2 Tranexamic acid is a synthetic low-cost antifibrinolytic drug manufactured and approved for intravenous and oral use, and systemic prophylactic use reduces both bleeding volume and transfusion needs by 30 to 40 percent.3,4 Although large studies have found little evidence of a prothrombotic effect from tranexamic acid,58 contradictory studies do exist.911 Moreover, a dose-dependent increase in seizures has been documented from intravenous use of tranexamic acid in cardiac surgery.12 Fear of possible adverse effects has, therefore, limited routine systemic use to surgery with expected high-volume bleeding and frequent need of blood transfusions; this includes mostly surgery affecting skeletal structures, such as joint arthroplasties, craniomaxillofacial surgery, and cardiac surgery, with its associated thoracotomy, use of cardiopulmonary bypass, and high-dose anticoagulation. Use in burns13,14 is not established, probably because of uncertainties regarding adverse effects of tranexamic acid during ongoing hyperfibrinolysis.15

An alternative to systemic use of tranexamic acid is local administration, which may provide sufficient drug concentrations at the wound surface with negligible risk of systemic adverse effects. Three meta-analyses on the use of topical tranexamic acid in surgery1618 all demonstrate a significant reduction of blood loss and transfusion needs without any increase in adverse events. However, in the two first meta-analyses by Ker et al. in 201316 and Montroy et al. in 2018,17 only two of 29 and three of 66 studies, respectively, addressed surgery conducted in soft tissues. In the latest meta-analysis, by Teoh et al. in 2020,18 seven of 71 studies addressed soft-tissue surgery.

The term “plastic surgery” encompasses exceedingly diverse procedures. Both systemic and topical use of tranexamic acid have already been explored in plastic surgical fields that involve skeletal structures such as rhinoplasty, craniomaxillofacial, and orthognathic surgery.1922 Yet, the larger bulk of plastic surgery takes place in soft tissue, and the effect of tranexamic acid according to type of tissue may be as clinically relevant as the effect in specific procedures.

Local use of tranexamic acid has been adopted by influential plastic surgeons and is receiving increasing attention.2327 Four published reviews on the use of tranexamic acid in plastic surgery since 201619,21,26,28 have, however, only identified a total of three randomized controlled trials on topical use, with two in orthognathic surgery29,30 and only one in soft tissue (i.e., reduction mammaplasty).31

The aim of this article is to provide insight on the pharmacological effects and adverse effects of tranexamic acid, review the current scientific evidence regarding local use in soft-tissue surgery, and present recommendations for use of tranexamic acid in plastic surgery.

METHODS

To describe the effect of local tranexamic acid in soft tissue, a systematic literature search was performed. The narrative review regarding other clinically relevant aspects is based on extensive literature searches combined with the authors’ own research and clinical experience.

TRANEXAMIC ACID: EFFECTS BEYOND ANTIFIBRINOLYSIS

Fibrinolysis is executed by the proteolytic enzyme plasmin.32 Plasmin also triggers platelet activation and thus increases platelet consumption.33 Plasmin inhibition will thus reduce bleeding both by reducing fibrin degradation and by preserving platelets.

Plasminogen is the inert precursor of plasmin. Plasminogen has multiple binding sites for the amino acid lysine. Binding to a lysine residue on the surface of fibrin, or to plasminogen receptors on a variety of cells,34 induces a conformational change in plasminogen to allow activation.35 Tissue-plasminogen activator released from damaged endothelium co-docks with plasminogen bound to fibrin. This co-docking aids the activation of plasminogen to plasmin, and proteolytic degradation of fibrin ensues (Fig. 1). In a variety of cells and tissues, plasminogen bound to plasminogen receptors is activated by urokinase-type plasminogen activator. Plasmin/plasminogen and plasminogen activators are involved in multiple physiological and pathophysiological processes outside of the fibrinolytic system.34,36 These include cell adhesion, migration and signaling, inflammation, wound debridement, and tissue remodeling.35,37

Fig. 1.

Fig. 1.

(Above, left) Plasminogen is the inert precursor to plasmin. It is produced from the liver and released into the circulation. In its unbound circulating state, plasminogen has a closed activation-resistant confirmation. Lysine binding sites on plasminogen (blue arrow) facilitate docking to exposed residues of the amino acid lysine (red arrows) on the surface of both fibrin (F) and a variety of cells (C). (Above, right) Docking to a lysine residue causes a conformational change in plasminogen (PG-A) that allows for its activation by plasminogen activators. Tissue-plasminogen activator (t-PA) is present in vessel endothelium and released upon vessel injury. Urokinase-type plasminogen activator (u-PA) is present in all tissue. (Below, left) Co-docking of plasminogen and t-PA on fibrin transforms plasminogen into the proteolytic enzyme plasmin (P) and fibrinolysis ensues. Similarly, co-docking of plasminogen and u-PA on cell surfaces can provide cells with proteolytic properties. (Below, right) Tranexamic acid is a lysine analogue, and binding to the lysine binding site of plasminogen prevents its docking and, thus, its activation.

Tranexamic acid is a synthetic analogue of lysine that blocks the lysine binding site on plasminogen, thus preventing the activation of plasminogen to plasmin (Fig. 1, below, right).38 Tranexamic acid can also block urokinase-type plasminogen activator.39 Tranexamic acid may therefore affect many processes related to surgery and wound healing other than fibrinolysis. The clinical implications of these complex interactions are insufficiently explored.

Lysine analogues can also act as competitive antagonists to inhibitory neurotransmitters acting on glycine40 and GABAA41 receptors in the central nervous system and thus cause hyperexcitability.42 This is a plausible explanation for the increase in seizures observed after high-dose intravenous administration in cardiac surgery.12 Direct application of tranexamic acid onto the central nervous system after accidental intrathecal injection has led to generalized seizures and even death.43

CONSIDERATIONS REGARDING TRANEXAMIC ACID TISSUE CONCENTRATION, ADMINISTRATION FORM, AND DOSE

A tissue concentration of at least 10 µg/ml tranexamic acid is needed to significantly inhibit fibrinolysis.44 A single intravenous dose of 10 to 15 mg/kg will keep plasma concentration above 10 µg/ml for 1 to 3 hours45 and may have little risk of adverse effects, such as venous thromboembolism3 or seizures.46 Although much higher dosing has been practiced, particularly in cardiac but also craniomaxillofacial surgery,19,47,48 there is little clinical support for increased effect with high dosing,49,50 and the reports of a dose-dependent increase in seizures is changing dosing practice.51 Tissue44 and synovial fluid52 tranexamic acid concentrations match those in plasma, whereas cerebrospinal fluid concentration reaches approximately 10% of plasma concentration.53 Concentrations will, however, remain high for a longer period in tissue than in plasma,44 possibly because of strong binding to plasminogen,38 and time to peak concentration and retention time may vary among tissues.44,54

The lowest effective concentration for local use is unknown.17 It is also unclear whether topical effect is determined by drug concentration, total drug dose, and/or a combination of concentration and contact time. In a meta-analysis by Montroy et al. on topical use of tranexamic acid, the effect on transfusion needs was not affected by dose; drug concentrations ranged from 1 to 100 mg/ml.17 Even the lowest concentration of 1 mg/ml solution will expose the wound surface to a concentration 100-fold stronger than what is considered the lowest inhibitory concentration in plasma. The effect of tranexamic acid may possibly be achieved through both prolonged exposure to low concentrations and short exposure to high concentrations.

Topical use of tranexamic acid is mostly applied at the end of a surgical procedure and, thus, cannot influence perioperative bleeding. Systemic administration of tranexamic acid before the initiation of surgery may be preferred when there is a risk of significant intraoperative hemorrhage,21 if a clear intraoperative view is essential,55 or if the procedure itself may trigger hyperfibrinolysis and platelet aggregation (e.g., through the use of cardiopulmonary bypass).56 When choosing systemic administration of tranexamic acid, adherence to recommended dose would be prudent.

EFFECT OF LOCAL TRANEXAMIC ACID IN SOFT-TISSUE SURGERY

Literature Search Strategy and Study Selection

With assistance from a Medical Research Librarian, we searched Medline, PubMed, Embase, The Cochrane Central Register of Controlled Trials, The Web of Science Core Collection, Google Scholar, and ClinicalTrials.gov from inception through March 20, 2020, for studies comparing the effect of local administration of tranexamic acid in surgery to either placebo or standard of care. The full electronic search strategy is provided in the Appendix. (See Appendix, Supplemental Digital Content 1, which shows the search strategy systematic review from March 20, 2020, http://links.lww.com/PRS/E932.) Search result and selection process are presented in Figure 2. Two authors (K.A. and R.F.) independently reviewed the retrieved results using the following inclusion criteria: (1) study population receiving local use of tranexamic acid in connection with a surgical procedure, (2) human studies, and (3) abstract or full-text article published. Orthopedic or cardiac studies and minor procedures, such as dental extractions or biopsies, were excluded. A full-text review of remaining publications was performed, and reference lists of relevant publications were screened. Randomized controlled trials were identified for final analyses for the systematic review. Other studies were included for the narrative review.

Fig. 2.

Fig. 2.

Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram for the systematic review.

Data Collection

In the randomized controlled trials, type of procedure, study sample size, tranexamic acid concentration, volume applied, mode of administration, and comparator were recorded for each study. Outcome data included blood loss, transfusion requirements, postoperative major bleeding requiring intervention, and surgeon satisfaction with the surgical field.

RESULTS

Twenty-two randomized controlled trials investigating the effect of local use of tranexamic acid outside of cardiac and orthopedic surgery were identified. Fifteen addressed soft-tissue surgery. According to the type of soft-tissue surgery, the randomized controlled trials were classified as “superficial tissue” or “inner organs.” Seven studies of tranexamic acid application in superficial soft tissues were identified, five with topical administration (Table 1) and two with local infiltration (Table 2).31, 5762 One study was excluded because of nonstandardized drug preparation.62 Eight studies addressed inner organs, four of which were performed in open surgery (Table 3)6366 and four in minimally invasive surgery (Table 4).6770 Thus, 14 studies from soft-tissue surgery, including a total of 1923 patients, were included. Eight randomized controlled trials from craniomaxillofacial (i.e., orthognathic and endoscopic sinus) surgery7178 were identified; one study was excluded because of inadequate information.78 These studies are presented separately as they may be of interest to surgeons in associated fields (Table 5) but are not discussed in detail in this review.

Table 1.

Randomized Controlled Trials on Local Use of Tranexamic Acid in Soft-Tissue Surgery: Superficial Tissue, Topical Application

Reference, Year, Publication Type TXA Group (total sample size) Procedure Concentration of TXA, Volume, Mode of Administration Comparator Bleeding * Postoperative Hemorrhagic Incidence/Intervention/Transfusion
Ausen 2015, article31 28 (56) Reduction mammaplasty 25 mg/ml, 20 ml, topical moistening 20 ml saline as placebo Drain production at 24 h (ml) median (range)
TXA 12.5 (0–44) vs placebo 20.5 (0–100), p = 0.038
Hematoma warranting reoperation before drain removal (n): TXA = 0 vs placebo = 2
Ausen 2019, article58 101 (202) Mastectomy 25 mg/ml, 20 ml, topical moistening 20 ml saline as placebo Drain production at 24 h (ml) mean (95% CI); TXA 110 (97–123) vs placebo 144 (122–167), p = 0.01 Hematoma warranting reoperation before drain removal (n): TXA = 1 vs placebo = 7
Albirmawy 2013. article57 200 (400) Adenoidectomy in children 100 mg/ml, 10 ml, topical bolus left for 5 minutes before suction removal. 10 ml saline as placebo Intraoperative blood loss (ml) TXA 19 ± 2.5 vs placebo 26 ± 4.3, p = 0.003 Postoperative hemorrhage (n); TXA = 5 vs placebo = 12; Nasal packing needed: TXA = 1 vs placebo = 4. Transfusion TXA = 0 vs placebo = 2
Parisi 2013, conference abstract59 50 (100) Subcutaneous pocket for cardiac pacemaker 100 mg/ml, 10 ml, topical irrigation No irrigation as control Not measured Presence of hematoma within 15 days (n): TXA = 2 vs control = 12. Surgical revision needed: TXA = 1 vs control = 8

TXA, tranexamic acid; CI, confidence interval.

*

Values are mean ± SD unless otherwise stated.

Values (n) are number of patients unless otherwise stated.

Table 2.

Randomized Controlled Trials on Local Use of Tranexamic Acid in Soft-Tissue Surgery: Superficial Tissue, Local Infiltration

Reference, Year, Publication Type TXA Group (total sample size) Procedure Concentration of TXA, Volume, Mode of Administration Comparator Bleeding * Postoperative Hemorrhagic Incidence/Intervention/Transfusion
Zilinsky 2019, article61 60 (127) Mohs microsurgery in head/neck Lidocaine20 mg/ml diluted 1:1 with 100 mg/ml TXA Lidocaine 20 mg/ml diluted with saline as placebo Ratio of dressing blood stain to surgical wound size TXA = 1.8 vs placebo = 2.5, p < 0.001 Not assessed
Sagiv 2018, article60 17 (34) Upper blepharoplasty Lidocaine 20 mg/ml diluted 1:1 with 100 mg/ml TXA Lidocaine 20 mg/ml diluted with saline as placebo No difference in blood weight in pads or cautery time No significant difference in ecchymoses

TXA, tranexamic acid.

*

Values are mean ± SD unless otherwise stated.

Table 3.

Randomized Controlled Trials on Local Use of Tranexamic Acid in Soft-Tissue Surgery: Inner Organs, Open Surgery

Reference, Year, Publication Type TXA Group (total sample size) Procedure Concentration of TXA, Volume, Mode of Administration Comparator Bleeding * Postoperative Hemorrhagic Incidence/Intervention/Transfusion
Sabry 2018, article64 35 (70) Lung decortication 30 mg/ml, 100 ml, poured into pleural cavity, drains clamped for 30–45 minutes 100 ml saline as placebo Postoperative blood loss drain production at 48 h (ml); TXA = 383 ± 120 vs placebo = 633 ± 164 Transfusion need (units of transfused blood) mean ± SD: TXA = 0.7 ± 0.9 vs placebo = 1.5 ± 1.1
Sallam 2019, article65 43 (86) Open hysterectomy 20 mg/ml, 50 ml irrigation, 50 ml intraabdominally 50 + 50 ml saline as placebo Total blood loss (ml)
TXA 395 ± 118 vs placebo 609 ± 119, p < 0.001
Transfusion need (n): TXA = 2 vs placebo = 4
Shady 2018, article66 35 (70) Open myomectomy 20 mg/ml, 100 ml, soaked gauze for 5 minutes 100 ml saline as placebo Total blood loss (ml) TXA = 684 ± 215 vs placebo = 1080 ± 126, p < 0.001 Transfusion need (n): TXA = 7 vs placebo = 19
Pourfakhr 2016, article63 186 total Prostatectomy 100 mg/ml, 5ml, topical irrigation after resection 5 ml saline as placebo Total blood loss (ml) TXA = 340 ± 152 vs placebo 515 ± SD not given, p = 0.01 Transfusion need (n): TXA = 0 vs placebo = 5

TXA, tranexamic acid; SD, standard deviation.

*

Values are mean unless otherwise stated.

Values (n) are number of patients unless otherwise stated.

Table 4.

Randomized Controlled Trials on Local Use of Tranexamic Acid in Soft-Tissue Surgery: Inner Organs, Minimally Invasive Procedures

Reference, Year, Publication Type TXA Group (total sample size) Procedure Concentration of TXA, Volume, Mode of Administration Comparator Bleeding * Postoperative Hemorrhagic Incidence/Intervention/Transfusion
Abdullah 2012, conference abstract67 52 total TURP 0.5 mg/ml in irrigation fluid Standard irrigation fluid Drop in Hb (g/dl) on first and second POD; TXA 0.87 and 0.31 vs placebo 0.98 and 0.95 Not assessed
Rani 2018, article69 30 (60) TURP 0.2 mg/ml in irrigation fluid Standard irrigation fluid Intraoperative blood loss (ml) TXA = 145 ± 13 vs placebo 198 ± 18, p < 0.01
Drop in Hb (g/dl) TXA = 0.81 ± 0.40 vs. placebo = 1.46 ± 0.37, p < 0.01
No transfusions in either group
Bansal 2017, article68 200 (400) Percutaneous nephrolithotomy 1 mg/ml in irrigation fluid Distilled water as placebo in irrigation fluid Total blood loss (ml) TXA = 155 ± 47 vs placebo 213 ± 68, p < 0.001 Transfusion need (n): TXA = 10 vs placebo = 25. Need of angioembolization (n): TXA = 1 vs placebo = 8
Rasheedy 2019, article70 40 (80) Hysteroscopic myomectomy 1 mg/ml in distention fluid Glycine as placebo in distention fluid Drop in Hb after 24 h (g/dl) TXA = 1.11 ± 0.58 vs placebo = 1.46 ± 0.61, p = 0.001 Excessive perioperative bleeding reported by surgeon (n): TXA = 1 vs placebo = 9. Good surgical view (n): TXA = 23 vs placebo = 8

TXA, tranexamic acid; TURP, transurethral prostatectomy; Hb, hemoglobin; POD, postoperative day.

*

Values are mean ± SD unless otherwise stated.

Values (n) are number of patients unless otherwise stated.

Table 5.

Randomized Controlled Trials on Local use of Tranexamic Acid in Orthognathic and Endoscopic Sinus Surgery

Reference, Year, and Publication Type TXA Group (total sample size), n Procedure TXA Concentration, Volume, Mode of Administration Comparator Bleeding * Postoperative Hemorrhagic Incidence/Intervention/Transfusion *
Jabalameli 2006, brief report74 26 (56) Endoscopic sinus surgery 50 mg/ml, 20 ml of bolus instillation 20 ml saline as placebo Intraoperative bleeding (ml) TXA = 174 ± 11 vs placebo 229 ± 24, p < 0.05 Surgical visual field score according to Boezaart (0–5): TXA = 2.31 ± 0.20 vs placebo 2.53 ± 0.15, p < 0.05
Athanasiadis 2007, article71 20 (40) Bilateral endoscopic sinus surgery Paired case/control. Investigation of two different concentrations. 100 mg/ml, 10 ml (n = 10) and 10 mg/ml, 10 ml (n = 10) topical irrigation after resection 10 ml saline as placebo Operating site assessed as bleeding the least by surgeon (n): TXA = 16 vs placebo = 4, p = 0.007 None in either group
Kaewpradub 2011, article76 20 (40) Orthognathic surgery 0.5 mg/ml in irrigation fluid Standard irrigation solution Intraoperative bleeding (ml) TXA = 833 ± 316 vs comparator 918 ± 424, p = 0.47 Transfusion need (units of transfused blood): TXA = 0.15 ± 0.36 vs comparator = 0.25 ± 0.55, p = 0.50
Jahanshahi 2014, article75 30 (60) Endoscopic sinus surgery 50 mg/ml in combination with adrenaline 5 mg/ml, soaked pledgets applied for 10 minutes before surgery 5 mg/ml adrenaline solution as comparator Blood loss from initiation until 45 minutes (ml) TXA = 100 ± 53 vs placebo 170 ± 46, p = 0.001 Surgical visual field score according to Boezaart (0–5): grading significantly lower in TXA group up to 30 minutes (p = 0.003) but not at 45 minutes (p = 0.163)
Shehata 2014, article77 25 (50) Endoscopic sinus surgery 50 mg/ml, 20 ml, for packing and irrigation during surgery 20 ml saline as placebo Intraoperative blood loss (ml) TXA = 214 ± 77 vs placebo = 273 ± 178, p < 0.01 Surgical visual field score according to Boezaart (0–5): TXA = 1.92 ± 0.64 vs placebo 2.64 ± 0.7, p < 0.01
Eftekharian 2015, article73 28 (56) Orthognatic surgery 1 mg/ml in irrigation fluid Standard irrigation fluid Intraoperative blood loss (ml) TXA = 575 ± 287 vs comparator 818 ± 262, p < 0.05 No transfusion needs in either group. Postoperative bleeding not measured
Barandaran-far 2017, article72 30 (60) Endoscopic sinus surgery 5 mg/ml in first 400 ml of irrigation fluid Standard irrigation fluid Intraoperative blood loss (ml) TXA = 236 vs comparator = 234 (SD not given), p = 0.31 Surgical visual field according to Boezaart (0–5): TXA = 2.73 vs comparator 3.0 (SD not given) p = 0.305

TXA, tranexamic acid; SD, standard deviation.

*

Values are mean ± SD unless otherwise stated.

Among the randomized controlled trials from soft-tissue surgery, two randomized controlled trials in reduction mammaplasty31 and mastectomy58 came from our group and were designed to assess the effect of topical application of tranexamic acid in soft tissue relevant to plastic surgery. The mode of application was moistening the wound surface with tranexamic acid 25 mg/ml, leaving a thin film of fluid only, as demonstrated in this video: https://www.youtube.com/watch?v=-8MAE3NAHfQ. Both studies found a 30 to 40 percent reduction in postoperative bleeding,

Removal of adenoids in children represents a model of superficial wounds. Albirmawy et al.57 poured a bolus of 10 ml of undiluted 100 mg/ml tranexamic acid into the nasopharynx and left it for 5 minutes; they then gradually suctioned nasopharyngeal fluid for another 5 minutes. They found a 27 percent reduction in blood loss.

The pockets created in pacemaker/defibrillator surgery resemble implant pockets in plastic surgery. Parisi et al.59 irrigated 100 pockets with undiluted 100 mg/ml tranexamic acid or placebo and found hematomas needing intervention in two tranexamic acid patients (4 percent) versus 12 placebo patients (24 percent). Although this study has been published as an abstract only, the reduction in hematomas is particularly interesting, as all patients were on anticoagulants.

In all four randomized controlled trials on topical tranexamic acid in superficial soft-tissue procedures, postoperative hemorrhage requiring intervention was more frequent in the placebo group than in the tranexamic acid group (Table 1). When combining the four randomized controlled trials, active intervention because of postoperative hemorrhage was needed in three of 379 patients (0.8 percent) receiving tranexamic acid versus 21 of 379 patients (5.5 percent) receiving placebo.

Two randomized controlled trials in superficial tissue used tissue infiltration of tranexamic acid instead of topical application (Table 2). In Mohs microsurgery, Zilinsky et al.61 found that a mixture of 50 mg/ml tranexamic acid and 1% lidocaine significantly reduced the dressing blood stain–to–wound size ratio by 28 percent compared to lidocaine diluted with saline.61 Sagiv et al.60 did not find statistically significant differences using the same solution in a possibly underpowered study in upper eyelid blepharoplasty.

Randomized controlled trials from open surgery on inner organs find both reduced bleeding volumes and transfusion needs from topical use of tranexamic acid (Table 3). Sabry et al.64 performed lung decortication surgery, which may be comparable to capsule/scar tissue excisions. They applied 100 ml of 30 mg/ml tranexamic acid into the thoracic cavity.

Two randomized controlled trials investigated the effect of topical tranexamic acid in open hysterectomy and myomectomy, which may reflect the effect of topical tranexamic acid in muscle. In open hysterectomy, Sallam and Shady65 and Shady et al.66 combined irrigation and an intraabdominal bolus using 20 mg/ml tranexamic acid, whereas in open myomectomy, Shady et al.66 applied 20 mg/ml tranexamic acid by means of a soaked gauze compressing the myoma bed for 5 minutes. In open prostatectomy, Pourfakhr et al.63 irrigated the wound bed with 5 ml of undiluted 100 mg/ml tranexamic acid. In sum, these randomized controlled trials from open surgery on inner organs report a 34 to 40 percent reduction of blood loss, and 19 of 401 tranexamic acid patients (4.7 percent) versus 53 of 401 placebo patients (13.2 percent) needed transfusion.

In minimally invasive procedures (Table 4), adding tranexamic acid to the irrigation fluid (final concentrations of 0.2 to 1 mg/ml) reduced blood loss in transurethral prostate surgery,67,69 percutaneous nephrolithotomy,68 and hysteroscopic myomectomy70 by 24 to 38 percent.

The visibility of the surgical field influences both operative result and safety. In nephrolitho tomy, Bansal and Arora68 found that irrigation fluid volume spent was halved when tranexamic acid was added to the fluid, and the risk of vessel injury requiring angioembolization was also significantly reduced. Rasheedy et al.70 reported three cases of uterine instrumental perforation during hysteroscopic myomectomy associated with poor operative field visibility in the placebo group.

COCKTAIL SOLUTIONS: ADDING TRANEXAMIC ACID TO LOCAL ANESTHETICS OR TUMESCENCE

Intraarticular tranexamic acid combined with adrenaline has shown superiority to tranexamic acid alone in reducing blood loss in joint arthroplasties.79

Namazi first suggested adding tranexamic acid to tumescence solution both for hair transplantation80 and liposuction.81 Fernau24 reported adding 1 mg/ml tranexamic acid to tumescence and infiltrating flanks in a blinded paired randomized fashion and found consistently less bruising on the tranexamic acid side. In rhytidectomies, Schroeder and Langsdon82 used local anesthetics or tumescence containing 10 mg/ml tranexamic acid and found a 70 percent reduction in drain output on the first day in a recent retrospective cohort study; Couto et al.,83 Nayak and Linkov,25 and Kochuba et al.84 reported reductions in operating time and drain production in rhytidectomy using tumescence with only 0.75 to 2 mg/ml tranexamic acid. In rhinoplasty, Brown et al.85 have reported adding tranexamic acid to the local anesthetic solution in addition to using intravaneous tranexamic acid. Randomized controlled trials on the use of tranexamic acid in rhinoplasty generally address systemic administration.20,22

In the four randomized controlled trials by our group and Zilinsky’s group31,58,60,61 (Tables 1 and 2), the effect of tranexamic acid alone as a hemostatic was examined, although both groups normally use cocktails with both lidocaine and adrenaline. More research is needed on a possible synergy between adrenaline and tranexamic acid for hemostasis in soft tissue.

LOCAL INFILTRATION OR TOPICAL APPLICATION?

Although local infiltration may provide higher and longer-lasting levels of tranexamic acid in the tissue,25 infiltrated tranexamic acid may not reach the raw wound surface to the same extent as free-flowing, topically applied tranexamic acid. Although topical (i.e., intraarticular) application of tranexamic acid has been proven noninferior to intravenous administration in orthopedic surgery,86,87 studies assessing infiltration are few and find less effect.88,89

In liposuction, systemic or infiltrative administration are the only options. In larger open surgery, complete contact between raw wound surface and tranexamic acid is more easily achieved through moistening than infiltration. In surgery with smaller wound areas, such as dermal surgeries, rhinoplasties, face lifts, and blepharoplasties, sufficiently large volumes of cocktail solutions may be injected to ensure contact between tranexamic acid and raw wound and provide a longer-lasting depot effect. Dosing and practicality may guide mode of administration.90

SYSTEMIC ADVERSE EFFECTS AFTER TOPICAL APPLICATION?

None of the three meta-analyses on topical use of tranexamic acid found any difference in incidence of possible systemic adverse events.1618 Tissue concentration after intravenous administration quickly matches that of plasma,44,52 and local administration resulting in a peak plasma concentration above 10 µg/ml can thus theoretically provide an antifibrinolytic concentration in other tissues. Plasma concentrations after topical administrations have mostly been investigated using single measurements at single timepoints,9194 and peak plasma concentrations have therefore been largely unknown. In a pharmacokinetic study in patients undergoing abdominoplasties,95 moistening these large wound surfaces with 25 mg/ml tranexamic acid or instilling a 200-ml bolus of 5 mg/ml tranexamic acid generally produced lower peak serum concentrations than 10 µg/ml. However, systemic concentration may be proportional to topical drug concentration and dose94 and may also be influenced by tissue vascularity and contact time. In knee arthroplasties, plasma concentrations reaching 10 to 20 µg/ml have been demonstrated both after a 500-mg intraarticular dose with prolonged drain clamping96 and after a 3-g dose without drain clamping.97

LOCAL ADVERSE EFFECTS AFTER LOCAL USE?

As discussed previously, tranexamic acid should never be applied topically onto the central nervous system, as this may cause convulsions.4143,79,98 High doses of tranexamic acid, as provided by topical application, may also inhibit glutamate receptors, which are present in various tissues.98 Human receptors with affinity for lysine analogues and the consequences of such bindings are inadequately explored.

Studies on the local toxicity of tranexamic acid have mainly been conducted on cartilage, tendon, and synovial tissue,99102 but our group and others have investigated the effect on keratinocytes and fibroblasts in vitro.95,103105 Short exposures even to high doses seem well-tolerated, as do prolonged exposures to concentrations below 10 mg/ml. The threshold value for toxicity may lie around 25 mg/ml given several hours of exposure, such as after intraarticular administration.99,100,102 In soft tissue, a physiological dilution of the drug may ensue faster.

Adverse effects may not only be caused by excessively high concentrations. Tranexamic acid in cancer treatment was investigated in the 1980s because of an observed inhibitory effect of tranexamic acid on tumor invasiveness and vascularization.106 Our group made the unexpected observation that prolonged exposure to high concentrations of topical tranexamic acid caused lack of re-epithelialization and even nontoxic epithelial detachment in an ex vivo human skin wound model.95 We have also observed an unexplained increase in seroma in patients undergoing mast ectomy with axillary lymph node clearance; to our knowledge, this is the first description of a possible clinically relevant adverse effect after topical tranexamic acid.58 The possible effect by tranexamic acid on cell adherence and migration caused by mechanisms linked to plasminogen/plasmin outside of the fibrinolytic system may explain these observations.35 In vivo, drugs will be physiologically diluted, and a prolonged exposure of several days from laboratory studies does not translate into clinical practice.

Topical tranexamic acid may, however, also have positive effects other than reduced bleeding; documented beneficial effects include reduction of inflammatory response in surgery56,107,108 and a reduction of melasma and erythema in dermatology.109,110 Tranexamic acid enemas in colorectal anastomosis surgery may prevent collagenolysis and anastomotic leakage.111 In animal models, fibrin glue containing tranexamic acid gave fewer intraabdominal adhesions,112,113 and topical tranexamic acid reduced healing in tendons114 but increased healing in fractures.115,116 The plethora of processes involving plasminogen/plasmin/urokinase-type plasminogen activator warrants further investigations regarding potential adverse and beneficial effects of topical tranexamic acid.

CONCLUSIONS

Local use of tranexamic acid may reduce blood loss comparably to intravenous prophylactic use with negligible risk of systemic adverse effects. It may also prevent reoperation because of hematoma. Tranexamic acid should, however, never come into contact with the central nervous system, as it may cause convulsions. Although prolonged exposure to high concentrations is discouraged, no single superior means of administration or dosage is supported in the literature, and lowest effective dose is unknown. There may not be one single ideal dosing regimen, but rather many possibilities adaptable for different surgical situations. Tranexamic acid in local anesthetics/tumescence with added adrenaline may be beneficial for both topical and infiltrative use. Systemic administration of tranexamic acid may, however, be beneficial for surgery with hard-to-control perioperative bleeding, particularly surgery involving bony structures. More high-quality studies are needed to determine whether efficacy and safety differ among the various methods of administration, and we look forward to future publications as the plastic surgical community continues to explore the use of tranexamic acid.

ACKNOWLEDGMENTS

The authors thank Sindre Andre Pedersen at the Library Section for Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway, for extensive assistance with the literature searches.

Supplementary Material

prs-149-774-s001.pdf (64.7KB, pdf)

Footnotes

Disclosure: Dr. Ausen has received a Ph.D. grant from the Liaison Committee between the Central Norway Regional Health Authority and the Norwegian University of Science and Technology. None of the authors has a financial interest to declare in relation to the content of this article.

Related digital media are available in the full-text version of the article on www.PRSJournal.com.

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