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Ann Thorac Surg 1996;61:1281-1285
© 1996 The Society of Thoracic Surgeons
University Department of Cardiac Surgery, Glasgow Royal Infirmary University NHS Trust, Glasgow, United Kingdom
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| Introduction |
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| Case Report |
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The initial clinical progress was uneventful, and a regimen of atenolol, 50 mg/d, was initiated on the second day of admission. The electrocardiogram continued to show persistent ST-segment elevation, and on the third day, the patient's condition deteriorated suddenly, and he sustained cardiac arrest. He was successfully resuscitated and regained consciousness but remained in shock with sinus tachycardia of 120 beats/min, unrecordable blood pressure, elevated central venous pressure, and normal heart sounds without murmurs. A regimen of dopamine hydrochloride and dobutamine hydrochloride was begun, whereupon blood pressure was restored to 85/60 mm Hg, and he was transferred to the regional coronary care unit for urgent investigation. Echocardiography on arrival showed moderate left ventricular dysfunction, fluid in the pericardial space, and diastolic collapse of the right atrium. A tear in the lateral aspect of the left ventricular free wall with overlying clot was identified (Fig 1
). Arrangements were made to take the patient to the operating theater immediately.
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The aortic cross-clamp was applied, and diastolic arrest was induced by antegrade warm glutamate-enriched blood cardioplegia followed by 800 mL of antegrade cold St. Thomas' crystalloid cardioplegia and topical cooling with cold saline solution. Distal anastomoses were fashioned, and the heart was reperfused with antegrade warm blood cardioplegia before release of the cross-clamp. The effective aortic cross-clamp time was 36 minutes.
The proximal anastomoses were constructed, and attention was then directed to the left ventricular free wall. There was a localized area of infarction in the circumflex territory. Adherent clot was teased away to reveal a tear sited on the lateral wall approximately one third of the way from base to apex, away from the atrioventricular groove and not closely related to any epicardial vessels. A 4-0 Prolene horizontal mattress suture pledgeted with Teflon felt was taken through the infarcted area, thus closing the tear. The heart was rested on bypass, and then the patient was weaned from bypass after 163 minutes with 5 µgkg-1min-1 of dopamine, 0.05 µgkg-1min-1 of epinephrine, and intraaortic balloon pump support.
Postoperatively the patient was electively sedated and ventilated for 48 hours, during which time inotropic support was withdrawn. The balloon was removed shortly thereafter. The patient made an uneventful recovery and was discharged from the hospital on the 11th postoperative day. At 2 months, he remains well and symptom free.
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The most common site of rupture is the anterior [14] or lateral wall [19], and a midventricular position along the apex to base axis is most frequent (66%) [14]. These patients usually have multivessel disease (81%), and all have severe obstruction of at least one major epicardial artery [14]. Most ruptures occur within the first week after infarction [6, 14, 20, 21], and this correlates well with studies of changes in the biomechanical strength of myocardium after infarction in animal models; it is equal to or greater than normal muscle after 7 days [22].
Data on the effect of reperfusion on the incidence of cardiac rupture conflict, possibly because of the small numbers involved in the studies. The incidence of cardiac rupture in one retrospective Portuguese study [23] showed no difference, with a cardiac rupture incidence of 4.5% (4/89 patients) in a group having thrombolysis compared with 4.4% (15/341 patients) in a group who did not. However, an American study [24] involving more patients suggested that the incidence of cardiac rupture was marginally lower in the reperfusion group overall (1.7% of 533 patients having thrombolysis compared with 2.7% of 807 patients who did not undergo thrombolysis). Further, when the timing of cardiac rupture was taken into account, reperfusion therapy seemed to have no impact on the incidence of cardiac rupture within the first 24 hours but significantly reduced the incidence of late cardiac rupture, ie, on or after 4 days (0.4% versus 1.5% of patients who did not undergo thrombolysis; p < 0.05). This correlates with laboratory evidence of increased resistance to infarct tearing and left ventricular distention at 8 days in hearts reperfused at 3 hours [22].
Clinical Presentation
In general, it is believed that increasing age [14, 2527], female sex [14, 20, 25, 26], preexisting hypertension [6, 20], and few or no previous infarctions [14, 28, 29] constitute risk factors for cardiac rupture. The onset of rupture may be heralded by chest pain [29], which may be resistant to opiates, or by the classic features of cardiac tamponade, namely, shock with hypotension, pulsus paradoxus, elevated venous pressure, quiet heart sounds, sinus bradycardia, or frank electromechanical dissociation.
Diagnostic Study
A high index of clinical suspicion is required. In particular, an abrupt deterioration in the patient's condition as in our patient in the absence of the cardiac murmurs of mitral regurgitation or ventricular septal defect is highly suggestive. The value of transthoracic two-dimensional echocardiography in the differential diagnosis of cardiac failure after myocardial infarction is widely reported [3033]. There are scattered reports of individual cases identified by other techniques, ie, transesophageal echocardiography [34], cineventriculography [16], and technetium 99mlabeled pyrophosphate scanning [35]. However, these reports are exceptional, and few would advocate routine use of these methods for this purpose. The condition of some patients may deteriorate so rapidly to the point of cardiopulmonary arrest that there will be insufficient time for detailed diagnostic evaluation by echocardiography. The finding of electromechanical dissociation should prompt consideration of tamponade and attempts at pericardiocentesis, although doubtless many of these patients will die.
Resuscitation
There is inevitably a finite time interval between diagnosis and definitive surgical intervention. Various techniques have been described in the literature where temporary stabilization has been achieved prior to definitive surgical intervention. We advocate inotropic support in all instances, as this is of proven benefit in improving cardiac output in cardiac tamponade [36] and is easily and rapidly instituted in all hospitals. Pericardiocentesis, if successful, relieves the immediate threat to life of tamponade. This has frequently been adopted in reported cases [3739], and the theoretic concern of excessive hemorrhage has been reported only once [38]. Facilities in some centers enable intraaortic balloon pump support to be achieved expeditiously, but this should not be required if pericardiocentesis has been successful and further, is not available in most district hospitals. The use of partial femoral bypass has also been reported. Although intuitively this is the ideal means of achieving hemodynamic control of the situation, in practical terms, it is not possible to accomplish this with sufficient speed to be of any practical benefit in most centers. If the patient's condition is sufficiently stable and revascularization is being contemplated, coronary angiography may be considered. This has been described to be successful under balloon pump support [40]. In general, however, it seems prudent to avoid the additional insult in an unstable clinical situation.
Mode of Surgical Repair
The aim of surgical intervention is first and foremost to remove the threat to life by relief of tamponade and closure of the ventricular defect. Longer-term goals are those of conventional coronary operations, ie, to prevent or limit the development of angina postoperatively and to improve the prognosis. These latter goals are controversial, as there are no data to support or refute them.
The patient should be prepared and draped before general anesthesia is induced, as peripheral vasodilatation and sudden cardiovascular collapse are likely. The chest and pericardium are opened expeditiously, relieving tamponade and thereby rendering the patient's condition stable from a cardiovascular point of view. The classic approach is to proceed with infarctectomy and replacement with a prosthetic patch under cardiopulmonary bypass [4143]. However, recent reports suggest that a more conservative approach may be preferable. Simple mattress sutures buttressed with felt [44] or application of a patch to the epicardial surface with biologic glue [32, 37, 45, 46] has been reported to lead to a successful outcome. When the defect is on the anterior or lateral surface of the heart simple closure can be achieved without resorting to cardiopulmonary bypass [32, 4547], and as already discussed, these are the most common sites of rupture. These latter observations are particularly pertinent because they suggest that the majority of patients could, in principle, be treated in a district hospital without cardiopulmonary bypass facilities. The patient can then be examined by elective coronary angiography and undergo a conventional coronary bypass operation later, as appropriate. One such patient who had emergent repair by buttressed mattress suture, however, had development of a ventricular aneurysm requiring resection under routine cardiopulmonary bypass [47], so there is a need of careful follow-up.
More than 80% of patients who undergo postmortem examination have multivessel disease, and all of these have severe obstruction of at least one major epicardial artery [14]. This finding is a strong indication to revascularize if local facilities permit, thus preventing the development of angina and improving the long-term prognosis. Preoperative coronary angiography in this setting is potentially fatal. Therefore, the realistic options are either to simply relieve tamponade, repair the defect as described already, and close or to establish cardiopulmonary bypass before closing the defect and grafting all major vessels empirically. The small numbers of patients involved prevent clinical trial, but we advocate the latter approach, which achieves revascularization early and avoids the risk of repeat infarction in the early postoperative period and the difficulties of early pericardial adhesions at reoperation.
The increasing availability of emergency echocardiography has facilitated antemortem diagnosis of postinfarction free wall rupture, and a continual rise in the number of diagnosed cases is inevitable. We hope that this review will stimulate discussion and help the individual cardiac surgeon to devise a strategy for managing this difficult and acute clinical dilemma so that we can challenge the mortality from a hitherto fatal condition.
| Footnotes |
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| References |
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