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PubMed1990

Pulmonary embolism: emboli and fibrinolysis inhibition in isolated canine lungs.

The effect of fibrinolysis inhibition with tranexamic acid on pulmonary microvascular permeability during glass bead embolization was investigated in the isolated lung. Lung lobes from nonheparinized dogs were treated in vivo with the equivalent of 0.6 g/kg 100 microns glass bead emboli alone, emboli after tranexamic acid, tranexamic acid alone, or the bead vehicle alone. After 40-50 min, the lobes were isolated for ex vivo perfusion with heparinized autologous blood. There were no changes in any parameter over the 120-min perfusion period. Blood flow at 120 min was decreased after both emboli alone and emboli with tranexamic acid, reflecting an increase in vascular resistance compared with the Tween or tranexamic acid controls. Furthermore, tranexamic acid increased the ratio of pre- to postcapillary resistance in embolized lobes compared with that after emboli alone or in the Tween or tranexamic acid controls. The isogravimetric capillary pressure and the osmotic reflection coefficient were not significantly decreased by tranexamic acid compared with those after emboli alone; however, it did result in an increase in the capillary filtration coefficient compared with that after emboli alone or in the control groups. We conclude that although fibrinolysis inhibition does not clearly exacerbate the lung injury seen after emboli, the tranexamic acid-induced changes in hemodynamics would tend to accelerate edema formation.

Animals↗

PubMed2001

Antifibrinolytic agents and desmopressin as hemostatic agents in cardiac surgery.

OBJECTIVE: To review the use of systemic hemostatic medications for reducing bleeding and transfusion requirements with cardiac surgery. DATA SOURCES: Articles were obtained through computerized searches involving MEDLINE (from 1966 to September 2000). Additionally, several textbooks containing information on the diagnosis and management of bleeding associated with cardiac surgery were reviewed. The bibliographies of retrieved publications and textbooks were reviewed for additional references. STUDY SELECTION: Due to the large number of randomized investigations involving systemic hemostatic medications for reducing bleeding associated with cardiac surgery, the article selection process focused on recent randomized controlled trials, metaanalyses and pharmacoeconomic evaluations. DATA EXTRACTION: The primary outcomes extracted from the literature were blood loss and associated transfusion requirements, although other outcome measures such as mortality were extracted when available. DATA SYNTHESIS: Although the majority of investigations for reducing cardiac bleeding and transfusion requirements have involved aprotinin, evidence from recent meta-analyses and randomized trials indicates that the synthetic antifibrinolytic agents, aminocaproic acid and tranexamic acid, have similar clinical efficacy. Additionally, aminocaproic acid (and to a lesser extent tranexamic acid) is much less costly. More comparative information of hemostatic agents is needed retative to other outcomes (eg., reoperation rates, myocardial infarction, stroke). There is insufficient evidence to recommend the use of desmopressin for reducing bleeding and transfusion requirements in cardiac surgery, although certain subsets of patients may benefit from its use. CONCLUSIONS: Of the medications that have been used to reduce bleeding and transfusion requirements with cardiac surgery, the antifibrinolytic agents have the best evidence supporting their use. Aminocaproic acid is the least costly therapy based on medication costs and transfusion requirements.

Aminocaproates↗

PubMed1985

Clinical application of inhibitors of fibrinolysis.

The basic proteinase inhibitor from bovine organs, aprotinin, was first identified in 1930 and its effect on enzyme and other biological systems has since been extensively studied. Aprotinin can only be administered intravenously and has a half-life of about 2 hours. Its administration at the start of cardiopulmonary bypass surgery appears to reduce blood loss and to protect against global myocardial ischaemia. Similarly, a smaller infarct size seems to result from early administration of aprotinin within the first hour after myocardial infarction, though further studies are needed to confirm this effect. A combination of aprotinin with tranexamic acid may be effective in preventing or delaying rebleeding after rupture of an intracerebral aneurysm; the addition of aprotinin seems to decrease the incidence of delayed cerebral vasospasm and ischaemic complications which are sometimes noted when tranexamic acid alone is used. Aprotinin is also effective as adjuvant treatment in traumatic haemorrhagic shock. The recommended loading dose is 15,000 to 20,000 KIU/kg bodyweight administered as a short intravenous infusion, followed by 50,000 KIU/hour by continuous infusion. Side effects of aprotinin are very rare. Epsilon-Aminocaproic acid (EACA), p-aminomethylbenzoic acid (PAMBA) and tranexamic acid are synthetic antifibrinolytic amino acids. Saturation of the lysine binding sites of plasminogen with these inhibitors displaces plasminogen from the fibrin surface. On a molar basis tranexamic acid is at least 7 times more potent that epsilon-aminocaproic acid and twice as potent as p-aminomethylbenzoic acid. All 3 compounds are readily absorbed from the gastrointestinal tract and excreted in active form in the urine. The plasma half-life of tranexamic acid is about 80 minutes. The main indications for tranexamic acid are the prevention of excessive bleeding after tonsillectomy, prostatic surgery, and cervical conisation, and primary and IUD-induced menorrhagia. It is possible that gastric and intestinal bleeding can also be reduced as well as recurrent epistaxis. Tranexamic acid could also be useful after ocular trauma. The value of fibrinolysis inhibitors in the prevention of bleeding after tooth extraction in patients with haemophilia is well documented, as is the treatment of hereditary angioneurotic oedema. The usual dose of tranexamic acid is 0.5 to 1g (10 to 15 mg/kg bodyweight) given intravenously 2 to 3 times daily, or 1 to 1.5 g orally 3 to 4 times daily. This dose needs to be reduced in patients with renal insufficiency. The main side effects of tranexamic acid are nausea or diarrhoea.

4-Aminobenzoic Acid↗

PubMed2003

Tranexamic acid-induced visual impairment in a hemodialysis patient.

We report a case of overdosage of tranexamic acid (TNA), which was suggested as the cause of visual impairment in a 56-year-old man. He had been undergoing chronic hemodialysis for 1 year, following 10 years of peritoneal dialysis. He had been hospitalized for an emergency operation for a bleeding ulcer of the stomach and duodenum. After the operation, he experienced a gradual loss of sight over about 1 week, although his general condition was good. He received intravenous injections of TNA as a hemostat during hospitalization for the operation. Two weeks after the operation he became blind. Retinography was flat and his visual field had become narrowed. On fluorescein angiography, microgranular hyperfluorescence, which indicated malfunction of the pigmented layer of the retina, was observed. No abnormality of the brain or the optic nerve was shown by magnetic resonance imaging. Concentrations of vitamins and trace minerals in the blood were within the normal ranges. Administration of vitamins A and B(12) did not improve his sight. However, discontinuation of TNA rapidly restored his sight, within a few days. He had received TNA once before because of bleeding ulcer, and his sight had been impaired at that time. Based on the repeated episodes, it was strongly suggested that an overdose of TNA in this dialysis patient caused the sight disturbance. Because TNA is metabolized by the kidney, caution is necessary when prescribing TNA for patients with renal failure.

Angiography↗

PubMed1991

Prevention of in vitro fibrinogenolysis during laboratory monitoring of thrombolytic therapy with streptokinase or APSAC.

In the present study, we systematically investigated aprotinin, epsilon-aminocaproic acid (EACA) and tranexamic acid as inhibitors of fibrinogen breakdown and of the generation of fibrinogen degradation products (FgDP). The experimental setting very closely imitated the conditions in practice when collecting blood from patients receiving thrombolytic therapy with streptokinase or APSAC. The minimal concentration of aprotinin required to completely inhibit fibrinogen breakdown and FgDP generation was 200 KIU/ml blood. This was sufficient even at the highest concentrations of streptokinase and APSAC expected to occur in patients (300 U/ml and 46 nM, respectively). However, 200 KIU/ml aprotinin heavily interfered in the determinations of plasminogen and alpha 2-antiplasmin. Relatively low concentrations of EACA (200 mM) and tranexamic acid (35 mM) were sufficient to prevent FgDP generation, but they interfered in the Clauss assay of fibrinogen. A non-interfering concentration of EACA (7 mM) allowed the inhibition of lower concentrations of APSAC (20 nM) and streptokinase. We conclude that at least 200 KIU aprotinin per ml blood is necessary to effectively inhibit in vitro fibrinogenolysis under circumstances likely to be met in clinical practice during thrombolytic therapy.

Aminocaproic Acid↗

PubMed2000

Differences between neonates and adults in the urokinase-plasminogen activator (u-PA) pathway of the fibrinolytic system.

This study deals with plasminogen activation kinetics of fetal and adult Glu-plasminogen types 1 and 2 as well as fetal and adult Lys-plasminogen by urokinase in the presence and absence of the lysine analogues epsilon-amino-n-caproic acid (EACA) and tranexamic acid. In addition, activation kinetics of single-chain urokinase-plasminogen activator (scu-PA) by adult and fetal plasmin types were investigated in the absence and presence of soluble fibrin. All Lys-plasminogen isoforms were more readily activated by urokinase than their corresponding Glu-plasminogen types. No substantial differences of the catalytic constants of urokinase-catalyzed plasminogen activation could be obtained when all fetal plasminogen types were compared to the respective adult types. In the case of all Glu-plasminogen isoforms, EACA as well as tranexamic acid first stimulated the activation process and, at higher concentrations, showed inhibitory properties. Again, the relative ability of all fetal plasminogen types to interact with lysine analogues revealed no differences compared to the respective adult glycoforms. In the absence of soluble fibrin, the catalytic efficiency of scu-PA activation by plasmin was significantly lower for both fetal plasmin isoforms. However, there were no differences in catalytic efficiency between fetal and adult plasmin types in the presence of 4 microM soluble fibrin. In conclusion, no substantial differences exist in urokinase-catalyzed plasminogen activation between neonates and adults, which is in contrast to reported data on plasminogen activation by tissue-type plasminogen activator. In the absence of soluble fibrin, scu-PA activation by fetal plasmin is markedly slower than by adult plasmin. However, this is compensated when fibrin is added at a concentration that is close to the physiological fibrinogen concentration in plasma. It can be summarized that the differences in carbohydrate structures of fetal and adult plasminogen are not associated with major differences in the global function of this part of fibrinolysis, despite functional alterations of scu-PA activation.

Adult↗

PubMed1977

Reference values for fibrinogen concentration and inhibitors of fibrinolysis.

epsilon-Aminocaproic acid and tranexamic acid when added to whole blood will dissolve in the plasma and draw water from the cells in accordance with their concentration. When these compounds are added to whole blood in recommended amounts (10 mg/ml), the osmotic dilution of the plasma must be taken into consideration when concentrated solutions or dry substances are used.

Aminocaproic Acid↗

PubMed1986

Excessive fibrinolysis in suspected amyloidosis: demonstration of plasmin-alpha 2-plasmin inhibitor complex and von Willebrand factor fragment in plasma.

We performed a hemostatic evaluation in detail in a patient with suspected amyloidosis who was suffering from several bleeding episodes. He had a shortened euglobulin clot lysis time, decreased alpha 2-plasmin inhibitor (alpha 2-PI), decreased plasminogen, elevated tissue-type plasminogen activator (t-PA), elevated plasmin-alpha 2-PI complex, and decreased ratio of ristocetin cofactor to von Willebrand factor (vWF) antigen. Fibrinogen and fibrin/fibrinogen degradation products levels fluctuated, with abnormal values on several occasions. On crossed immunoelectrophoresis, plasmin-alpha 2-PI complex and vWF fragment were demonstrated in the patient plasma. These abnormal findings and bleeding symptoms improved following the administration of tranexamic acid. Discontinuation of tranexamic acid resulted in deterioration of these parameters. These observations indicate that pathologic fibrinolysis (continuous intravascular plasmin generation) characterized by the consumption of alpha 2-PI and plasminogen, formation of plasmin-alpha 2-PI complex, and fragmentation of vWF contributed to the bleeding in this patient. It is important to recognize excessive fibrinolysis as the underlying cause of bleeding in these patients, since specific treatment with antifibrinolytic agents is effective in controlling the bleeding.

Amyloidosis↗

PubMed2000

First-line management of menorrhagia: findings from a survey of general practitioners in Forth Valley.

This study was undertaken to determine local GPs' current management of menorrhagia, prior to the release of the Royal College of Obs tetricians and Gynaecologists' (RCOG) guideline on the initial management of menorrhagia. A postal questionnaire was sent to 204 GPs in the Forth Valley area. An 84% (n = 173) response rate was recorded. Responses were compared with RCOG guideline recommendations after its release. Fifty-two percent of respondents measured a full blood count and 56% performed a pelvic examination. Two thirds of GPs chose the recommended treatments (mefenamic acid or tranexamic acid) as their first or second choice of treatment in women not requiring contraception. One third chose cyclical progestogens. Only 10% of GPs selected an ineffective treatment (cyclical progestogens) as their first or second choice of treatment in women requiring contraception. This survey demonstrates that the majority of GPs are already prescribing the treatments recommended in the RCOG guidelines. There is a need for education amongst a minority to improve their practice. Half of the GPs reported compliance with the recommended investigations of full blood count and pelvic examination. The point at which these investigations are performed in the initial management of menorrhagia may need further discussion between primary and secondary care clinicians to clarify their purpose.

Data Collection↗

PubMed1990

Transfusion and coagulation: an overview and recent advances in practice modalities. Part II: Pharmacologic adjuncts, cell salvage mechanisms, alternatives in blood donation.

Increasing public awareness of the risks associated with the transfusion of blood products has encouraged the development of alternatives to the use of homologous blood. Pharmacologic agents, cell salvage, and directed donations are three such mechanisms being utilized with greater frequency for blood and component therapy. At present, only three drugs are available for clinical use: DDAVP, epsilon-aminocaproic acid, and tranexamic acid. Cell salvage is available in two system types. Salvage of whole blood in passive collection systems is simplest to use and returns more coagulation factors, but yields a larger volume with a lower hematocrit. Whole blood salvage with subsequent washing and resuspension in normal saline returns only red cells in saline with the majority of coagulation factors removed. The quality of red cells in each system remains relatively constant and the decision regarding which system to employ should be based on the nature of the surgical procedure and the anticipated blood loss. The development of directed donation programs, including autologous predonation and directed homologous donation, permits a reduction in the frequency and total number of units of homologous volunteer blood administered. Directed blood donation provides an additional source of donated blood, but is not demonstrably safer than the volunteer homologous pool, and in fact, may even be less safe. Given the increased complexity of maintaining a designated donor program, these issues of safety play an important role in the ability to maintain operation of large scale directed donation programs.

Adjuvants, Pharmaceutic↗

PubMed1994

Metaanalysis of prophylactic drug treatment in the prevention of postoperative bleeding.

Prophylactic drug treatment is one of several strategies to reduce postoperative blood loss and potentially limit homologous blood use in open heart surgery. A computerized MEDLINE search supplemented with manual bibliography reviews was performed for randomized clinical trials published in peer-reviewed English-language journals from January 1980 to June 1993. A metaanalysis was conducted of trials evaluating desmopressin (group DD, n = 13), epsilon-aminocaproic acid or tranexamic acid (group EA, n = 4), and aprotinin (group AP, n = 16). Eligible studies used placebo controls and administered the drug in a prophylactic manner. The primary study end point was postoperative chest tube loss (mL, mean +/- standard deviation). There was a significant reduction in postoperative chest tube loss detected for each of the active treatments versus the placebo (DD versus controls: percent reduction 0.11, p = 0.0021; EA versus controls: percent reduction 0.30, p < 0.0001; and AP versus controls: percent reduction 0.36, p < 0.0001). Therapy with EA or AP was associated with a greater reduction in chest tube loss than DD (EA versus DD, p = 0.0033, and AP versus DD, p < 0.0001). Secondary study end points were transfusion requirements, chest reexploration, and perioperative mortality. The volume of postoperative red cell transfusion (mean +/- standard deviation) was reduced with EA (p < 0.0001) or AP treatment (p < 0.0001) compared with a placebo or DD, whereas the proportion of patients given transfusions was limited only in the AP-treated patients (odds ratio 0.23; 95% confidence interval, 0.16 to 0.33; p < 0.0001).(ABSTRACT TRUNCATED AT 250 WORDS)

Aminocaproic Acid↗

PubMed1994

Natural and synthetic antifibrinolytics in adult cardiac surgery: efficacy, effectiveness and efficiency.

Epsilon-aminocaproic acid and tranexamic acid, two synthetic antifibrinolytics, and aprotinin, an antifibrinolytic derived from bovine lung, are used to reduce excessive bleeding and transfusion of homologous blood products (HBP) after cardiac surgery. This review analyzes the studies on the utilization of antifibrinolytics in adult cardiac surgery according to the epidemiological concepts of efficacy, effectiveness and efficiency. A majority of published studies confirm the efficacy of antifibrinolytics administered prophylactically to reduce postoperative bleeding and transfusion of HBP. More studies are needed, however, to compare antifibrinolytics and determine if any one is superior to the others. Despite their demonstrated efficacy, antifibrinolytics are only one of the options available to diminish the use of HBP. Other blood-saving techniques, surgical expertise, temperature during cardiopulmonary bypass and respect of established transfusion guidelines may modify the effectiveness of antifibrinolytics to the point where antifibrinolytics may not be necessary. At this time, insufficient data have been published to perform a cost vs benefit analysis of the use of antifibrinolytics. This complex analysis takes into account not only direct costs (cost of the drug and of blood products), but also the ensuing effects of treatment such as: length of stay in the operating room, in the intensive care unit and in the hospital; need for surgical re-exploration; treatment of transfusion or drug-related complications, etc. In particular, the risk of thrombotic complications associated with antifibrinolytics is the subject of an ongoing, unresolved controversy.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMedDate not supplied

Chronic angioedema. Three relevant cases.

Three cases of clinical angioedema are reported in which the etiopathogenetic involvement of qualitative and quantitative complement disorders was demonstrated. The first patient had a functional deficit in C1 inhibitor, the second had a decrease in CH50, and the third, a reduction in the C1q, C3, and C4 fractions. The cases are interesting because of occasional difficulties in the causal diagnosis, the severity of the symptoms, which can include laryngeal edema, and, finally, the favorable outcome achieved with correct medication, which did not include antihistamines or steroids. The clinical picture of hereditary angioedema is characterized by the familial occurrence of the process, although this apparently was absent in these cases. Two patients experienced laryngeal edema and none had abdominal manifestations. The treatment of choice for angioedema of these characteristics is antifibrinolytic agents, which achieve good results in 70% of the patients. Epsilon-aminocaproic acid and tranexamic acid inhibit the formation of plasmin and fragments of the Hageman factor, thus inhibiting kallikrein and bradykinin production. The androgens danazol and stanazolol have been used since the 1970s, and stanazolol proved to be very effective in two of our patients.

Adult↗

PubMed1991

Management of IUD-associated menorrhagia in female rhesus monkeys (Macaca mulatta).

The study was undertaken to evaluate the effect of antifibrinolytic agents (epsilon-aminocaproic acid, EACA; tranexamic acid, AMCA), anti-inflammatory drugs (indomethacin, IND; ibuprofen, IBU; naproxen, NAP) and root extract of the plant Boerhaavia diffusa (BD) on menstrual cycle length (MCL), duration of menstrual flow (DMF), menstrual iron loss (MIL) and activity of uterine tissue plasminogen activator (tPA) in IUD-fitted monkeys. Premature onset of menstruation was observed in IUD-fitted monkeys (26.0 +/- 0.7 days, mean +/- SE) as compared to controls (28.7 +/- 0.4 days). No noteworthy change was observed in the MCL of drug treated monkeys as compared to IUD-fitted monkeys. An increase of 155%, 123.2%, and 288% was observed in the DMF, MIL and tPA activity after IUD insertion as compared to controls. Antifibrinolytic agents reduced the DMF, MIL and activity of tPA in IUD-fitted monkeys up to 117.4%, 116.4%, and 254%, whereas anti-inflammatory drugs caused a decrease only up to 69%, 95.1%, and 138%, respectively. Conclusively, root extract of B. diffusa treated IUD-fitted monkeys showed noticeable reduction in their DMF (124%), MIL (120.8%) and tPA activity (272%).

Aminocaproic Acid↗

PubMed1981

Adsorption to fibrin of native fragments of known primary structure from human plasminogen.

Limited proteolysis of native Glu-plasminogen with pancreatic elastase produced three major fragments, K1+2#3, K4, K5-light chain (miniplasminogen). Fibrin-binding was determined by clotting fibrinogen in the presence of 125I-labelled fragments and measuring 125I in the washed fibrin and in the supernatant. Of the fragments miniplasminogen showed the highest fibrin-binding, the strength of which was intermediate between those of Glu-plasminogen and Lys-plasminogen. The fibrin-binding of all three fragments was decreased by 6-aminohexanoic acid or tranexamic acid. This decrease was most pronounced with K1+2+3. The fibrin-binding of K1+2+3, but not that of K4 and miniplasminogen was decreased by alpha 2-antiplasmin. The fibrin-binding of K1+2+3 and mini-plasminogen was lower in a plasma clot than in a purified fibrin clot. Our results indicate that each of the three fragments can bind to fibrin. They confirm that an alpha 2-antiplasmin-binding site is located on K1+2+3. Furthermore two of the fragments, namely K4 and K1+2+3 contain lysine-binding site(s).

Binding Sites↗

PubMedDate not supplied

Intracranial aneurysms and subarachnoid hemorrhage. A cooperative study. Antifibrinolytic therapy in recent onset subarachnoid hemorrhage.

In this cooperative study among 13 institutions, 502 patients were treated with antifibrinolytic medication (epsilon-aminocaproic acid or tranexamic acid) within a 14-day period following rupture of an intracranial aneurysm. Mortality at the end of 14 days was 11.6%; proved rebleed rate was 12.7%. Patients with an internal carotid or anterior cerebral aneurysm had the highest mortality and rebleed rate. Most rebleeds occurred between the sixth and eleventh days following the initial bleed. Significantly higher mortality was reported among patients with cerebral vasospasm, yet rebleed rate was no different among those patients with or without vasospasm. The same pattern was observed among patients with a mean blood pressure value above and below 110 mm Hg. We conclude that antifibrinolytic therapy provides beneficial treatment to patients with recent onset subarachnoid hemorrhage (SAH) following rupture of an intracranial aneurysm.

Age Factors↗

PubMed1999

Pharmacological strategies to decrease excessive blood loss in cardiac surgery: a meta-analysis of clinically relevant endpoints.

BACKGROUND: Excessive bleeding may complicate cardiac surgery, and is associated with increased morbidity and mortality. Pharmacological strategies to decrease perioperative bleeding have been investigated in a large number of controlled trials, most of which have shown a decrease in blood loss. However, most studies lacked sufficient power to detect a beneficial effect on clinically more relevant outcomes. We did a meta-analysis of all randomised, controlled trials of the three most frequently used pharmacological strategies to decrease perioperative blood loss (aprotinin, lysine analogues [aminocaproic acid and tranexamic acid], and desmopressin). METHODS: Studies were included if they reported at least one clinically relevant outcome (mortality, rethoracotomy, proportion of patients receiving a transfusion, or perioperative myocardial infarction) in addition to perioperative blood loss. In addition, a separate meta-analysis was done for studies concerning complicated cardiac surgery. FINDINGS: We identified 72 trials (8409 patients) that met the inclusion criteria. Treatment with aprotinin decreased mortality almost two-fold (odds ratio 0.55 [95% CI 0.34-0.90]) compared with placebo. Treatment with aprotinin and with lysine analogues decreased the frequency of surgical re-exploration (0.37 [0.25-0.55], and 0.44 [0.22-0.90], respectively). These two treatments also significantly decreased the proportion of patients receiving any allogeneic blood transfusion. By contrast, the use of desmopressin resulted in a small decrease in perioperative blood loss, but was not associated with a beneficial effect on other clinical outcomes. Aprotinin and lysine analogues did not increase the risk of perioperative myocardial infarction; however, desmopressin was associated with a 2.4-fold increase in the risk of this complication. Studies in patients undergoing complicated cardiac surgery showed similar results. INTERPRETATION: Pharmacological strategies that decrease perioperative blood loss in cardiac surgery, in particular aprotinin and lysine analogues, also decrease mortality, the need for rethoracotomy, and the proportion of patients receiving a blood transfusion.

Aminocaproates↗

PubMed1991

Tranexamic acid-associated ligneous conjunctivitis with gingival and peritoneal lesions.

A considerable number of agents have been proposed as causing ligneous conjunctivitis. We report the first case to arise as a side effect of tranexamic acid (Cyclokapron), an anti-fibrinolytic drug used in the treatment of menorrhagia. In addition to the typical conjunctival changes our patient had lesions affecting the gingiva and the peritoneum the last causing considerable protein loss into the peritoneal cavity.

Adult↗