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. 2011 Apr 20;15(2):220. doi: 10.1186/cc10022

Clinical review: Intrapericardial fibrinolysis in management of purulent pericarditis

Pascal Augustin 1,✉, Mathieu Desmard 1, Pierre Mordant 2, Sigismond Lasocki 1, Jean-Michel Maury 2, Nicholas Heming 1, Philippe Montravers 1
PMCID: PMC3219308  PMID: 21575282

Abstract

Purulent pericarditis (PP) is a potentially life-threatening disease. Reported mortality rates are between 20 and 30%. Constrictive pericarditis occurs over the course of PP in at least 3.5% of cases. The frequency of persistent PP (chronic or recurrent purulent pericardial effusion occurring despite drainage and adequate antibiotherapy) is unknown because this entity was not previously classified as a complication of PP. No consensus exists on the optimal management of PP. Nevertheless, the cornerstone of PP management is complete eradication of the focus of infection. In retrospective studies, compared to simple drainage, systematic pericardiectomy provided a prevention of constrictive pericarditis with better clinical outcome. Because of potential morbidity associated with pericardiectomy, intrapericardial fibrinolysis has been proposed as a less invasive method for prevention of persistent PP and constrictive pericarditis. Experimental data demonstrate that fibrin formation, which occurs during the first week of the disease, is an essential step in the evolution to constrictive pericarditis and persistent PP. We reviewed the literature using the MEDLINE database. We evaluated the clinical efficacy, outcome, and complications of pericardial fibrinolysis. Seventy-four cases of fibrinolysis in PP were analysed. Pericarditis of tuberculous origin were excluded. Among the 40 included cases, only two treated by late fibrinolysis encountered failure requiring pericardiectomy. No patient encountered clinical or echocardiographic features of constriction during follow-up. Only one serious complication was described. Despite the lack of definitive evidence, potential benefits of fibrinolysis as a less invasive alternative to surgery in the management of PP seem promising. Early consideration should be given to fibrinolysis in order to prevent both constrictive and persistent PP. Nevertheless, in case of failure of fibrinolysis, pericardiectomy remains the primary option for complete eradication of infection.

Introduction

Purulent pericarditis (PP) usually occurs in the compromised host [1]. Predisposing factors have changed over time. Pneumonia was the primary source of infection for the majority of patients (72%) in the pre-antibiotic era, compared with only 22% of patients in the post-antibiotic era [2]. Nowadays, most cases of PP are healthcare associated. Bloodstream infections or underlying non-infectious conditions such as thoracic surgery, chronic kidney disease, immunosuppression, or malignancy (Table 1) are new predisposing factors.

Table 1.

Classification of purulent pericarditis according to source of infecting organism

I Infection by contiguous spread from a pleural, mediastinal or pulmonary focus
II Infection by contiguous spread of intracardiac infection
III Infection following systemic bacteraemia
IV Infection with contiguous spread from a postoperative infection
V Infection following a subdiaphragmatic suppurative lesion
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Despite medical progress, PP is still associated with high mortality (20 to 30%) attributed to both early and late complications, namely persistent PP and constrictive pericarditis [1,2]. These late complications may be prevented by early pericardiectomy, a surgical procedure known for its potential morbidity. Twenty years ago, intrapericardial fibrinolysis emerged as a promising alternative to surgery. Nevertheless, there is no consensus about its indication.

The history, pathophysiology, complications and surgical management of PP are described. In light of the physiological and histological data, we review the rationale of fibrinolysis in PP, the evidence for its efficacy, and all publications on indications, timing, results, and complications.

Methods

We searched for reported case series of PP managed with fibrinolysis. We reviewed the MEDLINE database since 1951. The following keywords were used: 'purulent pericarditis', 'infectious pericarditis', 'constrictive pericarditis', 'fibrinolysis', 'streptokinase' (SK), 'urokinase' (UK), 'tissue plasminogen activator' (tPA), and 'pericarditis'. We reviewed only English-language literature. We found 134 cases including 94 cases reported in one single study, providing pooled results of 60 tuberculous pericarditis patients and 34 PP patients. As patients with tuberculous pericarditis were excluded, only 74 cases were finally considered. As the specific outcome of the 34 PP cases was not available, our outcome analysis only focused on the 40 remaining cases [3].

Information related to modalities of administration, complications, and outcome of fibrinolysis was collected.

Definitions and aetiologic classification

PP is defined as a neutrophilic pericardial effusion infected by a bacterial, fungal, or parasitic agent. Tuberculous pericarditis is a lymphocytic effusion. Classification of PP comprises five aetiologic entities (Table 1) [1,4]. The advent of antibiotics has changed epidemiological and aetiopathogenic features. The median age of patients has increased from 21 to 49 years [2], whereas the overall frequency of PP has decreased. Before the antibiotic era, PP accounted for 40% of all cases of acute pericarditis and was related to the contiguous spread of lung infections in 72% of cases. Nowadays, pneumonia remains the primary source of infection in only 22% of cases while PP is mainly associated with healthcare and bloodstream infections [1,2,5]. For instance, oesophageal and cardiothoracic surgeries can be responsible for the direct inoculation of the pericardial space whereas immunosuppressive therapy, dialysis, and chemotherapy are relatively recent predisposing conditions [2,4].

Diagnosis

The only way to diagnose PP is to obtain pericardial fluid for microbiological culture and direct microscopic examination. In a context of pneumonia, transthoracic echocardiography or computed tomography scan of the chest may disclose complications such as pleural empyema or pericardial effusion [6,7] (Figure 1). Interestingly, PP may have an insidious presentation without pericardial signs until occurrence of cardiac tamponade [2,4,8,9] (Table 2). Indeed, in a postmortem series by Klacsmann and colleagues, among 55 cases of PP only 10 cases had been suspected and diagnosed ante mortem [1]. Poor diagnostic performance of the condition results in late diagnosis, at an advanced stage, after onset of pericardial adhesions [10].

Figure 1.

Figure 1

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Computed tomography scan showing complications of pneumonia. Chest computed tomography scan of a patient with left alveolar pneumonia, complicated by empyema (E) and circumferential pericardial effusion (PE). R, right; L, left.

Table 2.

Clinical features and complications of purulent pericarditis (from [2])

Clinical feature
 Duration of symptoms before presentation (days) 7 ± 3
 Chest pain 31
 Fever 85
 Pericardial friction rub 33
 Electrocardiographic abnormalities 45
Complication
 Death 29
 Cardiac tamponade 15
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Data presented as mean ± standard deviation or percentage.

Complications

PP may lead to cardiac tamponade and septic shock. The treatment of these conditions has no specificity. On the contrary, constrictive pericarditis and persistent PP - two late-stage complications - imply specific considerations and management [1,4].

Constrictive pericarditis is defined by the thickening and fusion of the pericardium causing low pericardial compliance and right heart failure. Haemodynamic compromise and low cardiac output may ensue because of adiastoly or impaired cardiac filling. Pericardial fibrosis is caused by chronic/subacute inflammation inducing fibroblast proliferation and collagen deposition. Two large reviews found the same frequency of 3.5% for constrictive pericarditis during the course of PP [2,11]. In one smaller study with long-term follow-up, however, constrictive pericarditis occurred in 57% of cases, with few cases occurring during the first year.

We propose an original definition for persistent PP. This entity is defined by a chronic or recurrent purulent pericardial effusion occurring despite drainage and adequate antibiotherapy. This feature is well described in case reports. Persistence of PP is associated with occurrence of pericardial adhesions and loculation of pericardial effusion due to the presence of thick fibrin clots preventing complete evacuation of pus through pericardial drains or pericardiostomy [12-17]. Purulent discharge persists during several weeks and may lead to death due to septic shock or tamponade. At the stage of persistent PP, pericardiectomy is challenging and associated with high morbidity because of pericardial adherences and areas of fusion. Moreover, patients present with impaired general status [12-17]. Interestingly, this entity has not been previously defined or classified as a late complication of PP, resulting in a lack of epidemiological data. Finally, because of chronic inflammation, persistent PP may promote constrictive pericarditis. Nevertheless, these two entities have distinct clinical and pathophysiological features.

Pathophysiology of purulent pericarditis and of its complications

PP shares pathophysiological similarities with empyema. In the case of empyema, the contiguous spread of pneumonia causes pleural mesothelial barrier dysfunction leading to exudative pleural effusion [18]. The second step is bacterial invasion, which attracts leucocytes. Activated leucocytes promote coagulation, resulting in fibrin formation [19]. Fibrin deposits are responsible for pleural adhesion, thickening, and loculation of effusion, therefore preventing easy drainage and antibiotic diffusion. When the process is prolonged, inflammation leads to fibrosis due to collagen secretion.

Experimental models argue for a similar pathophysiological process in PP, leading from pericardial inflammation to pericardial adhesion and fibrosis [20,21]. These studies indicate that pericardial loculation and intrapericardial fibrosis may occur respectively 1 week and 2 weeks after onset of the disease [20,21].

Furthermore, these studies show that fibrin formation is the cornerstone in the pathogenesis of both persistent PP and constrictive pericarditis. Fibrin may thus be a target in the management of PP.

General management, surgery and fibrinolysis

General medico-surgical management

Management of PP requires a combined surgical and medical approach with complete drainage of the effusion and complementary antibiotherapy. Antibiotic regimen is initially empirical and should target Staphylococcus aureus. Anaerobes and Gram-negative bacteria should be targeted in case of a digestive origin [22,23]. In recently hospitalised patients, methicillin-resistant Staphylococcus should be considered [23]. Considering the lack of guidelines on the duration of antibiotherapy in PP and by analogy with empyema, a treatment of at least 3 weeks seems reasonable [24]. Moreover, antibiotherapy should be maintained until removal of the focus of infection, and until improvement of clinical and biological signs.

Surgery

Until 1941 the mortality of PP was estimated to be 100% in untreated cases. Pericardiostomy decreased mortality to about 50%, and to 30% when associated with antibiotics [17]. Eradication of infected pericardial fluid is the cornerstone of PP therapy, although the way to obtain eradication remains controversial (Table 3) [25]. Guidelines from the European Society of Cardiology make the following statement: 'Frequent irrigation of the pericardial cavity with UK or SK, using large catheters, may liquefy the purulent exudate, but open surgical drainage through subxiphoid pericardiotomy is preferable' [26]. Because of loculations and adhesions, simple evacuation by surgical or percutaneous drainage may not prevent constrictive pericarditis or persistent PP [25,27-29]. To avoid these complications, invasive surgical treatment has been advocated. In a retrospective series, partial pericardial resection or total pericardiectomy seem to be associated with a better outcome than simple pericardial drainage [4,10,25,27,29] (Table 4). Taken together these studies suggest a curative role of pericardiectomy by achieving complete eradication of the infection and a role in preventing persistent PP and constrictive pericarditis.

Table 3.

Different surgical modalities for pericardial effusion evacuation

I Subxiphoid percutaneous catheter
II Subxiphoid tube drain
III Subxiphoid tube or percutaneous catheter and fibrinolysis
IV Pericardial window and pleural drain
V Partial pericardiectomy with pericardial tube
VI Anterior interphrenic pericardiectomy
VII Total pericardiectomy
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Adapted from [25].

Table 4.

Outcome according to management with primary pericardiectomy or pericardiocentesis

Mortality
Reference Pericardiectomy Pericardiocentesis
[4]a - 5/11 (45)
[27]b 0/4 (0) -
[29]c 8/50 (16) 20/31 (65)
[25]d 1/13 (8) -
[10]e 0/1 (0) 3/14 (21)
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Data presented as n (%). aPericardiocentesis: rescue pericardiectomy in four cases (all survivors). bPericardiectomy. cWindow pericardiectomy and manual breakdown of adhesions. dPartial pericardiectomy. ePericardiocentesis: rescue pericardiectomy in six cases (five survivors).

Despite these convincing data, physicians are reluctant to perform preventive surgery associated with potential serious complications. Nevertheless, this procedure could be easier early in the disease, before apparition of adhesions. Furthermore, operative mortality is related to the preoperative disability of patients [30,31] and haemodynamic compromise is rarely observed at an early stage. Some authors therefore advocate a systematic early preventive pericardiectomy [32].

Fibrinolysis

Intrapericardial fibrinolysis, a less invasive procedure, has been proposed as an alternative to surgery for PP management. The objective of fibrinolysis is to target fibrin formation, to optimise evacuation of a thick fluid, and therefore to prevent both persistent PP and constrictive pericarditis.

Rationale of intrapericardial fibrinolysis

Fibrinolysis in PP follows the same rationale as that in empyema. In the latter, surgery also has better results than simple drainage. Many authors have attempted to demonstrate the efficacy of intrapleural fibrinolysis compared with simple drainage for prevention of persistent empyema requiring surgical debridement. Efficacy of fibrinolysis was demonstrated in a randomised controlled trial (RCT) and a meta-analysis [33,34]. In a double-blind RCT including 44 patients, Diacon and colleagues found a better clinical outcome and fewer referrals to surgery in the SK group [33]. Unexpectedly, the largest RCT testing the efficacy of SK in empyema did not find any significant difference between both groups [35]. The group of 208 patients assigned to SK treatment had the same rate of referrals to surgery as the group of 222 patients who received normal saline. The population of this study was heterogeneous and the timing of fibrinolysis was late, however, suggesting that fibrinolysis may still be useful in subgroups of younger patients treated earlier.

Evidence of pericardial fibrinolysis efficacy

Given the similarities between empyema and PP, fibrinolysis has been considered in PP. The first cases of successful management of PP with fibrinolysis were reported in 1951 [12,14]. These patients had chronic PP persisting and relapsing despite pericardiostomy and antibiotics. Fibrinolysis was successfully administered at a late stage as a rescue treatment, allowing complete evacuation of purulent material. Forgotten for 30 years, the treatment was rediscovered in 1984 by Bennett [13]. Efficacy of fibrinolysis was also demonstrated in an experimental model of acute pericarditis in dogs [21]. Fibrinolysis or normal saline was applied through a pericardial drain daily from the third through sixth day after instillation of the irritant mixture. Clinical and histological patterns of constrictive pericarditis were evaluated over a 60-day period. All 11 animals assigned to the normal saline group developed pericardial thickening and adhesions. Among these, nine animals demonstrated clinical features of constrictive pericarditis. One-half of the 10 animals in the UK group did not demonstrate any sign of constriction or any histological changes of the pericardium.

Clinical data on fibrinolysis in PP exist. All cases of fibrinolysis in PP available in the English-language literature are summarised in Table 5. There is great heterogeneity in the different protocols used. Among 40 analysable cases, we found two cases of failure requiring pericardiectomy with a favourable outcome. Out of two described deaths, only one was due to PP. No sign of clinical constriction at hospital discharge was observed for the 35 remaining patients (data not provided for three patients). During followup, no constriction was found in patients for whom data were available (20 patients on clinical examination and 12 patients on transthoracic echocardiography).

Table 5.

Published English-language articles on pericardial fibrinolysis for purulent pericarditis: protocols and outcome

Reference Age (years) TF Agent Dose Volume Modality Associated TT tube size n Complications Outcome
[12] ND ND SK ND ND ND Tube drain 1 ND Survived; follow-up ND
[14] 35 P SK ND ND Daily injection for 12 days Intrapericardial ATB
SD 15 F tube drain 1 None No clinical sign of constriction at 15 months
[15] 6 R SK 100,000 U ND Daily instillations iterative punctures for 7 days Intrapericardial ATB 1 Febrile reactions No clinical sign of constriction
SD 25,000 U No drain Follow-up ND
[17] 26 R SK 90,000 U 30 ml Daily for 1 month Intrapericardial ATB 1 None No clinical sign of constriction several months later
SD 24,000 U Sternectomy pericardiostomy
[13] ND ND SK ND ND ND Tube drain 2 None Complete evacuation. Constriction sign ND; follow-up
ND
[16] 21 to 54 R UK 400,000 U 20 ml Each 8 hours Catheter size ND 3 None One death not related to PP; one without constriction
(2 to 7 doses) on TTE at 1 year; one recovered, no follow-up
[36] 76 R SK 100,000 U 20 ml Each 8 hours; clamp 1 hour; 1 week 7F catheter 1 None Survived at 4 months
SD 25,000 U Intrapericardial ATB No clinical sign of constriction
[37] 16 to 38 R SK 250,000 U ND Four times; each 2 days Drainage ND 2 None No clinical sign of constriction at 6 months and 2 years
[38] 78 R SK 250,000 U 20 to 40 ml Three times; each 12 hours; clamp Drainage ND 1 Slight bleeding No clinical or TEE sign of constriction at day 30
[39] <1 to 12 R SK 10,000 to 15,000 U/kg ND Each 12 hours; for 2 to 8 days 8F catheter 6 One bleeding with tamponade All survived; no clinical or TTE sign of constriction at 19.8 months
[40] 61 R SK 100,000 U 10 ml Each 8 hours; for 24 hours; clamp 1 hour 7F catheter 1 None Persisting PP; need for surgery for pericardial window
[41] 39 R UK 400,000 U 20 ml Each 8 hours; for 4 days Systemic CT, catheter size ND 1 None No clinical sign of constriction at 8 months
[28] 5 to 50 P SK 2,000 U/kg 50 ml Daily; for 1 to 6 days 7F catheter 6 None One death by septic shock; five with no clinical sign of constriction; follow-up ND
[42] 36 R SK 300,000 U ND Daily; for 5 days Catheter size ND 1 None Failure: tamponade at 3 weeks; partial pericardiectomy. No sign of constriction at 2 months
[43] <1 to 4 P SK ND ND Daily; duration ND Catheter size ND 3 One nonsevere bleeding Complete evacuation. No TTE sign of constriction at 3 years
[44] 61 R tPA 30 mg 100 ml ND Surgical drainage 1 None Survived; no TTE sign of constriction
[45] 41 R UK 120,000 U 10 ml Daily; clamp 12 hours; for 5 days 16F catheter 1 None No constriction on TTE at discharge.; follow-up: 3 years
[46] 50 R SK 500,000 U 50 ml Three instillations in 10 minutes the first day 7F catheter 1 None No constriction on TTE at 12 weeks
[47] 3 to 13 P SK 15,000 U/kg 50 ml Solution warmed; clamp 2 hours 7F catheter 6 None All patients followed up 6 months to 5 years; no clinical sign of constriction
[3] 9 to 66 P UK 200,000 U 20 ml Clamp 1 hour 7F catheter 94 12.7% nonsevere bleeding TTE signs of constriction: 19% in UK group vs. 57% in controla
[48] <1 R tPA ND ND Three instillations; each 12 hours; clamp 2 hours Catheter ND 1 None No TTE sign of constriction at hospital at discharge; follow-up ND
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ATB, antibiotic; CT, computed tomography; n, number of patients; ND, not determined in the article; P, primary fibrinolysis; PP, purulent pericarditis; R, fibrinolysis in rescue; SD, streptodornase; SK, streptokinase; TEE, transesophageal echocardiography; TF, timing of fibrinolysis; tPA, tissue plasminogen activator; TT, treatment; TTE, transthoracic echocardiography; U, units; UK, urokinase. aHeterogeneous population with tuberculous and purulent pericarditis.

One RCT with long-term follow-up (mean 57 ± 29 months) assessed the efficacy of fibrinolysis in PP [3]. Unfortunately, the study population included both tuberculous pericarditis (n = 60) and PP (n = 34). Compared with tuberculous pericarditis, PP was 10 times (P < 0.0001) more likely to be associated with constrictive pericarditis on transthoracic echocardiography. Fibrinolysis lowered pericardial thickening, and decreased the rate of constrictive pericarditis by 38.3% (hazard ratio = 0.185, P < 0.0001). The length of evolution of the disease before treatment was also predictive of constrictive pericarditis. Interestingly, the rate of constrictive pericarditis was much higher than in previous reports (3.5% vs. 57% in placebo group), but follow-up was much longer. Constriction occurred with a mean delay of 11 months. We cannot draw any definitive conclusion from this study since no subgroup analysis was performed in the PP population.

Timing of fibrinolysis in PP

There is no consensus on the appropriate timing of fibrinolysis (Table 5). Two main options can be distinguished: primary fibrinolysis performed immediately after drain insertion, and rescue fibrinolysis applied in cases of recurrence or incomplete evacuation of pus. Among published articles, we only found cases of failure when fibrinolysis had been applied late. At this stage, thick loculations cannot be liquefied by fibrinolytic agent [40,42] (Table 5). Furthermore, fibrinolytic agents can only dissolve fibrin, but have no effect on fibrosis. Two experimental studies indicate that fibrin influx increases during the first week of the disease and that fibrosis may appear after 2 weeks [20,21]. These studies suggest that earlier administration may lead to optimal outcomes. Nevertheless, data regarding optimal timing are solely based on animal models and on a few case reports, limiting the ability to make a definitive statement.

Optimal fibrinolytic dose and volume

SK, UK and tPA have all been used in pericardial fibrinolysis. Dose comparison between tPA and UK found an equivalence of 36,000 units UK for 1 mg tPA [49]. Most studies of fibrinolysis in PP used SK. Because of the risk of allergy, however, using UK or tPA has been suggested [50]. Owing to the lack of guidelines, there is large variability in fibrinolytic dosing in the reported cases. UK was used at a dose of 400,000 units in four cases and 200,000 units in another study, diluted in 20 ml normal saline. The British Thoracic Society guidelines for the management of pleural infection propose instillation of 250,000 UI SK daily or twice daily or of 100,000 UI UK daily [24]. A dose of 10 mg tPA has been proposed in empyema [51]. There are no definitive data on the appropriate dose of these three fibrinolytic agents. Given the different regimens previously used in PP (Table 5) and the doses proposed by the British Thoracic Society and the American Thoracic Society for treating empyema, reasonable options may be daily instillations of 250,000 UI SK, 200,000 UI UK or 10 mg tPA. Each instillation should be diluted in a volume of at least 20 ml normal saline to ensure adequate diffusion into the pericardial space. Fibrinolytic agents must be retained in the pericardial space by clamping the drain for 2 to 4 hours. Treatment may be repeated for three consecutive days to achieve complete pericardial drainage, assessed by echocardiography (Figure 2).

Figure 2.

Figure 2

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Flow diagram describing the proposed algorithm for diagnosis and management of purulent pericarditis. *In relation to aetiologic classification (Table 1). **If no haemorrhagic complication of pericardial drainage. +If catheter/drain is permeable. PP, purulent pericarditis.

Failure and complications of fibrinolysis

In case of fibrinolysis failure, resulting in incomplete drainage despite three consecutive instillations of fibrinolytic agent associated with adequate antibiotherapy, a surgical approach should be considered. Given the prognosis and the general status of the patient, radical pericardiectomy should only be performed if its benefits are believed to outweigh the potential drawbacks.

Three complications of fibrinolysis can theoretically occur. Even if allergy is a well-known side effect of fibrinolysis after repeated instillation of SK, treatment with UK or tPA greatly reduces this risk [50]. The second risk is major haemorrhage. Only one case of haemorrhagic tamponade after fibrinolysis has been described [39]. This could be a consequence of PP and not directly related to fibrinolysis. Fibrinolysis for empyema is not associated with bleeding events [33,35]. Indeed, fibrinolysis in PP has no systemic effect detected on coagulation laboratory tests [28]. The third risk is cardiac tamponade, which could occur if the instilled volume is not evacuated by the pericardial drain. The pressure-volume curve (Figure 3) described in the experimental study published by Refsum and colleagues illustrates that the addition of a small volume of liquid may provoke cardiac compression [52]. This risk could be increased in the later stage of the disease, characterised by low pericardial compliance secondary to fibrosis. In fact, no tamponade due to intrapericardial administration of fibrinolysis has been described. The risk of tamponade could be lowered if the volume of fibrinolytic agent instilled is inferior to the amount of fluid drained immediately beforehand.

Figure 3.

Figure 3

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Pericardial pressure-volume curve. Adapted with permission from [52].

Definitive conclusions on the risks and complications of intrapericardial fibrinolysis cannot be made with the evaluation of 74 case reports. Potential benefits of fibrinolysis seem to outweigh its apparent low morbidity.

Conclusion

PP managed with simple pericardial drainage may evolve to constrictive and persistent PP. Despite the lack of definitive evidence, intrapericardial fibrinolysis may be an alternative to pericardiectomy as a treatment for PP and for prevention of persistent PP and constrictive pericarditis. Clinical and experimental data demonstrate that features of irreversible fibrosis may appear after 2 weeks. Considering that diagnosis of PP is often delayed, early consideration should therefore be given to fibrinolysis to ensure optimal efficacy. Complications of intrapericardial fibrinolysis have only exceptionally been reported. Physicians should thus not be reluctant to apply this promising technique. Nevertheless, in cases of failure of fibrinolysis, pericardiectomy remains the primary option to consider for complete eradication of infection and prevention of persistent PP and constrictive pericarditis.

Abbreviations

PP: purulent pericarditis; RCT: randomised controlled trial; SK: streptokinase; tPA: tissue plasminogen activator; UK: urokinase.

Competing interests

The authors declare that they have no competing interests.

Contributor Information

Pascal Augustin, Email: pascalaugustin@hotmail.com.

Mathieu Desmard, Email: mathieu.desmard@bch.fr.

Pierre Mordant, Email: pierre.mordant@bch.aphp.fr.

Sigismond Lasocki, Email: sigismond.lasocki@bch.fr.

Jean-Michel Maury, Email: jeanmichel.maury@bch.fr.

Nicholas Heming, Email: nicholas.heming@orange.fr.

Philippe Montravers, Email: philippe.montravers@bch.fr.

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