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J Thorac Cardiovasc Surg 1996;112:637-643
© 1996 Mosby, Inc.
GENERAL THORACIC SURGERY |
Received for publication Jan. 2, 1996 Revisions requested Feb. 16, 1996; revisions received March 13, 1996 Accepted for publication March 18, 1996. Address for reprints: Frances A. Shepherd, MD, FRCPC, The Toronto Hospital, ML2-035, 200 Elizabeth St., Toronto, Ontario, Canada M5G 2C4.
Abstract
Objective: The management of malignant pericardial effusion remains controversial. We present our experience with 93 patients referred for drainage and sclerosing procedures between 1979 and 1994.
Methods: With continuous electrocardiographic monitoring, a Kifa catheter was inserted percutaneously into the pericardial sac and allowed to drain. A 100 mg dose of lidocaine hydrochloride was instilled intrapericardially, followed by 500 to 1000 mg tetracycline or doxycycline hydrochloride in 20 to 50 ml normal saline solution. The catheter was clamped for 1 to 2 hours and then reopened, and the procedure was repeated daily until the net drainage was less than 25 ml in 24 hours.
Results: Subjects included 53 women and 40 men (median age 58 years). Eight patients could not undergo sclerosis because of technical failure. Eighty-five patients underwent sclerosis and required a median dose of 1500 mg of the sclerosing agent (range 500 to 700 mg), given in a median of three injections (range one to eight). Complications included pain (17 patients), atrial arrhythmias (eight patients), fever with temperature greater than 38.5° C (seven patients), and infection (one patient). Two patients had cardiac arrest before sclerosis could be attempted. Sixty-eight patients (73%) had the effusion controlled for longer than 30 days, for an overall control rate of 81%. Seven other patients had control of the effusion but died of progressive malignant disease in less than 30 days. The overall median survival was 98 days (range 1 to 1724 days). Comparison of these results with outcomes reported for patients with malignant pericardial effusion who underwent surgical drainage indicates that drainage and sclerosis provide similar survivals but sclerosis carries lower morbidity, mortality, and recurrence rates.
Conclusion: Percutaneous drainage and sclerosis constitutes a safe and effective treatment for malignant pericardial effusion. Surgical management should be reserved for the small percentage of cases that cannot be controlled by this method. (J THORACCARDIOVASCSURG1996;112:637-43)
The incidence of pericardial involvement as a complication of malignancy has been reported to range from as low as 0.1% in clinical studies to 21% in some autopsy series.
1 Malignant pericardial effusion (MPE) is frequently not suspected until the signs and symptoms of cardiac tamponade develop; at this stage, this complication of malignancy is potentially fatal unless promptly treated. Treatment of this oncologic emergency, however, often results in good palliation of symptoms and prolongation of survival.
2
Several studies have shown that tetracycline sclerosis is a safe and effective treatment for MPE.
3,4 Recent reports, however, continue to suggest that a surgical approach, either subxiphoid drainage with or without window formation or a limited pericardiotomy, should be the initial treatment for MPE.
5-7 The development of thoracoscopy has permitted more ready surgical access to the pericardium, and recent reports recommend this approach.
8,9 For the past 15 years, patients with cardiac tamponade arising from MPE have been treated medically in our institution with percutaneous drainage and tetracycline sclerosis of the pericardial sac. We present here our updated experience with tetracycline sclerosis and compare our results with outcomes reported in the surgical literature.
Methods
We reviewed the records of 99 patients with MPE seen at our institution between January 1, 1979, and March 1, 1994. Of these patients, 93 were referred for drainage and tetracycline or doxycycline sclerosis of the pericardial space.
Baseline investigations for all patients included history, physical examination, chest radiography, electrocardiography, and two-dimensional echocardiography. After echocardiographic confirmation of the presence of pericardial effusion, patients were taken to the cardiac care unit for electrocardiographic monitoring. Under sterile conditions, a 6.5F Kifa catheter (Cook Incorporated, Bloomington, Ind.) was inserted percutaneously through a subxiphoid approach into the pericardial sac by means of the Seldinger technique. The catheter was then connected to a Hemovac system (Zimmer, Patient Care Div., Dover, Ohio) with a three-way stopcock and left in place to drain.
When patients were in hemodynamically stable condition, they were transferred to the general medical ward for the sclerosing procedure. To prevent pain, 100 mg lidocaine hydrochloride was injected intrapericardially before instillation of the sclerosing agent. Either 500 to 1000 mg tetracycline hydrochloride (80 patients) or 500 to 1000 mg doxycycline hydrochloride (five patients) was dissolved in 10 to 20 ml normal saline solution and inserted through the catheter into the pericardial sac. The catheter was clamped for 1 to 2 hours and then reopened and allowed to drain to the Hemovac system. Special positioning of the patient was not required. This procedure was repeated every 24 to 48 hours, until the net drainage was less than 25 ml/24 hours. The catheter was removed only after echocardiography confirmed that the effusion had resolved. Patient follow-up after sclerosis was predominantly by means of physical examination and chest radiography. Echocardiography was repeated as clinically indicated.
Pericardial fluid from the initial pericardiocentesis was examined for protein, cell count, cytologic characteristics, and culture. Treatment outcome was evaluated according to the criteria of Smith, Lane, and Hudgins.
10 Successful treatment was defined as follows: (1) reduction or resolution of the effusion for a minimum of 30 days, (2) the absence of symptoms, and (3) no requirement for pericardiocentesis within 30 days of initiation of treatment. Survival time was calculated from the date of first instillation of the sclerosing agent to the date of death or most recent follow-up.
Results
Of the 99 patients, three underwent pericardiocentesis alone and three who had neither clinical nor echocardiographic evidence of tamponade did not have their effusions drained. The remaining 93 patients were referred for tetracycline or doxycycline sclerosis and form the basis of this report.
The characteristics of the study population are presented in
Table I. There were 53 women and 40 men, with a median age of 58 years (range 24 to 77 years). Carcinoma of the breast and lung accounted for 76% of the primary tumors. The remaining 24% included adenocarcinoma of unknown origin in eight patients (9%), mesothelioma in six patients (7%), stomach cancer in three patients (3%), and non-Hodgkins lymphoma, Hodgkins lymphoma, leukemia, ovarian cancer, and sarcoma in one patient each. MPE was diagnosed at the initial presentation of the malignancy in two patients with lung cancer, but MPE was diagnosed several months to several years after the first cancer diagnosis in the remaining patients. The pericardial fluid was examined cytologically in 90 patients and had malignant cells in 77% of these cases. All baseline pericardial fluid samples were sterile.
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Dyspnea, the most common presenting symptom of MPE, was found in 85 patients (91%;
Table II). Other common symptoms included cough in 39 patients (42%), orthopnea in 30 patients (32%), chest pain in 19 patients (20%) and peripheral edema in 16 patients (17%). When first seen, all patients had one or more physical findings suggestive of cardiac tamponade, with paradoxic pulse (62% of patients) and elevated jugular venous pressure (51% of patients) being the most common. The diagnosis of MPE was confirmed by two-dimensional echocardiography for all patients
(Table III). Right atrial inversion was present in 61 patients (66%) and right ventricular collapse was present in 46 patients (49%); both are evidence of cardiac tamponade. Pericardial metastases were identified in 19 patients (20%).
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As outlined in
Table IV, eight patients (8%) did not receive tetracycline or doxycycline sclerosis for technical reasons. In five cases, the catheter became clotted before sclerosis could be attempted. In one case, the catheter could not be inserted; in another, the catheter was removed after complete drainage but before instillation of tetracycline because of discomfort at the catheter site. The eighth patient died after a cardiac arrest 1 hour after pericardiocentesis, before instillation of tetracycline. The remaining 85 patients received between one and eight instillations of tetracycline or doxycycline (median three) and a total dose of 500 to 7000 mg (median dose 2000 mg). The median number of days required for sclerosis was 5 (range 1 to 17).
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Discussion
The accumulation of fluid in the pericardial space is a potentially fatal complication of malignancy if not recognized early and treated aggressively. It has been reported that 36% of patients with metastases to the pericardium die as a direct result of pericardial involvement; in a further 49% of cases, pericardial involvement contributes significantly to death.
2
The pathogenesis of MPE is thought to involve two major mechanisms.
11 Increased fluid may be produced from the visceral pericardium as a result of direct spread of the tumor to the serosal surface and of fluid accumulation in the pericardial space. Alternatively, obstruction of lymphatic and venous outflow by tumor may cause increased hydrostatic pressure, which results in accumulation of fluid. Regardless of the mechanism that leads to the development of the MPE, the goals of treatment are to provide relief of symptoms and to prevent the immediate and late complications of this disorder, especially fatal cardiac tamponade.
In most cases, the diagnosis of MPE is made after the diagnosis of an underlying malignancy has been established.
12 This was also the case in our study, in which only two patients had MPEs at the time of the initial cancer diagnosis. As a result, pericardial effusions frequently remain clinically unsuspected because the early symptoms may be nonspecific and attributed falsely to tumor progression. Furthermore, when MPE results in cardiac tamponade, the predominant symptoms are usually respiratory and may initially be attributed to worsening pulmonary or pleural metastases.
2,13,14 As seen in our study, dyspnea, cough, and orthopnea were the most common presenting symptoms of MPE. The physical, electrocardiographic, and chest radiographic findings were generally nonspecific. The diagnosis was usually suspected when an enlarged cardiac shadow was seen on chest radiography; it was then confirmed in each case by echocardiography. All patients had a moderate to large pericardial effusion, and almost all had echocardiographic evidence of tamponade.
Although simple pericardiocentesis may be lifesaving, this procedure alone is seldom adequate as treatment because it is associated with a high rate of reaccumulation of fluid and recurrence of symptoms.
15 For that reason, pericardiocentesis is usually followed by a definitive medical or surgical procedure designed to prevent further fluid accumulation and to provide an alternative drainage site to prevent cardiac tamponade.
Definitive management remains controversial. Surgical techniques for the management of MPE have evolved considerably during the past decade. Pericardiectomy is rarely performed today for MPE because the operative risks range from 17% to 30%.
16,17 Recent literature favors the creation of a pericardial window either by the subxiphoid route, by anterior thoracotomy, or by thoracoscopy.
8,9,17,18 Indeed, thoracoscopy has led surgeons to a renewed interest in the surgical management of MPE, even though this technique requires general anesthesia and single-lung ventilation.
9
We reviewed the results from all surgical series published in the last 15 years and extracted the outcomes reported for patients who underwent subxiphoid pericardial window creation with tube drainage
5,6,17-25 or drainage by video-assisted thoracoscopic surgery.
8,9,26-30 We compared the outcomes of these two techniques with results from published trials of tetracycline sclerosis
3,10,15 and with the data from our series of 93 patients
(Table VII). Direct comparison indicates that simple sclerosis provides similar survival with lower mortality and recurrence rates. The rates of pericardial constriction with the two procedures are comparable; indeed there are no cases reported after sclerosis, whereas our review indicates a 10% constriction rate in one study employing the pericardial window technique. The follow-up period for the thoracoscopic studies was shorter on average than that reported for the other techniques; long-term complications of recurrence and constriction associated with thoracoscopy may thus be underestimated.
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Our review suggests that the major differences between medical and surgical management are the operative risks associated with surgical procedures. Forty-four percent of the subxiphoid window creations and 100% of the video-assisted thoracoscopic procedures were performed with the patient under general anesthesia. Intraoperative complications reported in several series included hypotension necessitating inotropic support,
21 pneumothorax,
18 and death.
5,20 The development of atrial arrhythmias has been reported in both surgical
5 and medical series
3,15 and was seen in 7% of the cases in our series. These arrhythmias were always self-limited and never life-threatening. Pain and fever, which have been cited as unacceptable accompaniments of percutaneous drainage and sclerosis,
19 were seen in 20% and 7% of patients, respectively, in our series. The fever usually lasted less than 24 hours, and an organism was cultured from the pericardial fluid in only one case in which the catheter remained in place for longer than 7 days. Pain was temporally related to the injection of the sclerosing agent; despite premedication with lidocaine of all patients, it was necessary to administer narcotic analgesics to 17 patients (20%). Pain and fever are also common occurrences during the early postoperative period after almost all surgical procedures, however, and we believe that low rates of these complications are reported in the surgical series because they are not considered to be complications worthy of note.
Because the parenteral form of tetracycline is no longer commercially available, other sclerosing agents are currently under investigation. Both doxycycline and bleomycin have been used successfully
34,35 in small series, and we are currently undertaking a prospective comparison of these two agents.
In summary, percutaneous pericardiocentesis and tetracycline or doxycycline sclerosis is a safe and effective safe treatment for MPE. In patients with known malignancy or with positive results of cytologic examination of pericardial fluid, sclerosis appears to be superior to subxiphoid pericardial window formation and video-assisted thoracoscopy. The latter technique should be reserved for those cases that remain undiagnosed after pericardiocentesis or for the small percentage of cases in which it is not possible to control the effusion by percutaneous drainage and sclerosis.
Footnotes
From the Department of Medicine, Division of Hematology/Oncology,a and the Department of Surgery, Division of Thoracic Surgery,b The Toronto Hospital and the University of Toronto, Toronto, Ontario, Canada. ![]()
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