Paradoxical embolism of a shotgun pellet

Paradoxical embolism of a shotgun pellet

562 CASE REPORT IKONOMIDIS ET AL PARADOXICAL EMBOLISM Ann Thorac Surg 1998;66:562– 4 Comment Tricuspid regurgitation is usually caused by right ven...

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562

CASE REPORT IKONOMIDIS ET AL PARADOXICAL EMBOLISM

Ann Thorac Surg 1998;66:562– 4

Comment Tricuspid regurgitation is usually caused by right ventricular hypertension, right ventricular enlargement, and annular dilatation secondary to mitral or aortic valvular disease, commonly referred to as “functional” regurgitation. It may also be caused by rheumatic disease of the annulus, valve leaflets, and subvalvular mechanism: “organic” regurgitation. In the majority of patients, TR has been considered functional rather than organic. The causes of isolated TR in adults include trauma, endocarditis, carcinoid heart disease, and congenital malformations of the tricuspid valve apparatus [1]. Pernot and associates [2] differentiated patients with congenital TR into two groups. The first group are neonates or infants with severe symptoms resulting in death either within the first several days or at a few months of age. The second group comprises patients in whom the clinical symptoms appear later and who die during adolescence or adult life. Medical treatment of the congestive heart failure stemming from congenital TR has been ineffective in the infant group [3]. Effective surgical treatment for neonates and infants with congenital TR remains problematic. In the adult group, some response has been reported, although the final outcome was death after a protracted worsening course. Most cases treated successfully by operation were in the adult group, because they had no cardiac abnormalities other than isolated TR and there was relatively good left ventricular function in spite of right heart failure. In most of the previously reported cases of congenital isolated TR, tricuspid leaflets and subvalvular tissue were absent, hypoplastic, or fused, and therefore tricuspid valvoplasty was difficult. Consequently, valve replacement was unavoidable in many cases. Considering the difficulty of postoperative anticoagulant therapy, bioprosthetic valves have been generally used. Before operation, this patient was diagnosed as having adult-type congenital TR; however, during the operation, displacement of the leaflets into the ventricle was not seen, and the tricuspid valve was almost intact except for a severely dilated tricuspid annulus. Because the cause of this isolated TR was not clear, we should have performed a myocardial biopsy to determine whether the annular dilatation was a result of acquired myocardial degeneration. After annular plication with a Carpentier ring, the tricuspid leaflets showed good coaptation. The restoration of tricuspid valve competence improved cardiac performance significantly.

References 1. Ahn AJ, Segal BL. Isolated tricuspid insufficiency: clinical features, diagnosis and management. Cardiovasc Dis 1966;9: 166–93. 2. Pernot C, Hoeffel JC, Henry M, Piwnica A. Congenital tricuspid insufficiency. Cardiovasc Radiol 1978;1:37– 44. 3. Aaron BL, Mills M, Lower RR: Congenital tricuspid insufficiency: definition and review. Chest 1976;69:637– 41. © 1998 by The Society of Thoracic Surgeons Published by Elsevier Science Inc

Paradoxical Embolism of a Shotgun Pellet John S. Ikonomidis, MD, PhD, Steven J. Nisco, MD, David H. Liang, MD, PhD, and Robert C. Robbins, MD Departments of Cardiothoracic Surgery and Cardiovascular Medicine, Stanford Health Services, Stanford, California

Paradoxical embolism of a projectile from the venous to arterial system is a rare occurrence, which can cause diagnostic confusion. We present a case of venous embolism of a shotgun pellet from the left upper extremity to the noncoronary sinus of the aortic valve across a secundum-type atrial septal defect. Prevention of distal embolism of the pellet was presumably a result of its containment by flow vortices created within the sinuses of Valsalva. (Ann Thorac Surg 1998;66:562– 4) © 1998 by The Society of Thoracic Surgeons

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ullet emboli are unusual occurrences. Entrance into the venous system by a projectile may result in embolization to the venae cavae or the heart. In exceptionally rare instances, the projectile may cross as a paradoxical embolus into the arterial circulation and embolize to distant sites. We describe a case of a paradoxical shotgun pellet embolism from the left upper extremity to the noncoronary sinus of the aortic valve via a secundum-type atrial septal defect. A 31-year-old woman presented to the Emergency Department with wounds from a single 12-gauge shotgun blast. The patient was hemodynamically stable and complained of chest pain, shortness of breath, and left arm weakness. Examination revealed a large left neck hematoma and pellet wounds concentrated in the left neck and shoulder. Breath sounds were clear bilaterally. Cardiac auscultation was unremarkable. Neurologic examination revealed evidence of left hand weakness. An anteroposterior roentgenogram showed a small left pleural effusion with associated atelectasis and multiple pellets in the chest wall. Left upper extremity roentgenograms showed no evidence of bony injury. A contrast esophagogram was normal. An arteriogram was performed, which showed no evidence of aortic arch or great vessel injury. However, a pellet was seen to be lying in or near the heart (Fig 1). This pellet appeared to move with each cardiac contraction but showed no evidence of dislodging. A computed tomogram of the chest showed a small foreign body in the heart, occupying the right or left Accepted for publication Feb 28, 1998. Address reprint requests to Dr Robbins, Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford Health Services, Stanford, CA 94305-5247 (e-mail: [email protected]).

0003-4975/98/$19.00 PII S0003-4975(98)00475-5

Ann Thorac Surg 1998;66:562– 4

CASE REPORT IKONOMIDIS ET AL PARADOXICAL EMBOLISM

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Fig 1. Aortogram showing a small, round object associated with the noncoronary sinus of the aortic valve.

atrium or interatrial septum (Fig 2). The aortic arch and descending thoracic aorta were surrounded by material consistent with a hematoma. A transesophageal echocardiogram revealed normal left ventricular size, thickness, and contractility with no evidence of effusion. In addition, a 1.2 3 1.2-cm atrial septal defect was identified, with foreign material sitting in the noncoronary cusp of the aortic valve (Fig 3). As there was no evidence of direct coexisting cardiac injury, it was thought that venous embolism was the likely route of entry of the pellet into the heart. Operation was recommended to the patient to extract the pellet because its exact position in the heart was uncertain, and because the finding of an atrial septal defect raised the possibility of paradoxical embolism. After median sternotomy, a small ecchymotic reaction

Fig 3. Transesophageal echocardiogram. (A) The embolized pellet (arrow) within the noncoronary sinus of the aortic valve. (B) Atrial septal defect (dark arrow); also shown is the pellet (light arrow) within the aortic valve. (Ao 5 aorta; LA 5 left atrium; RA 5 right atrium.)

was noted along the left lateral aspect of the ascending aorta. Opening of the pericardium revealed normal pericardial fluid and no evidence of injury to the surface of the heart. The patient was placed on cardiopulmonary bypass after establishment of ascending aortic and bicaval cannulation. The heart was arrested with cold blood cardioplegia given via the aortic root. The right atrium was opened, and after suctioning of bright red blood, a 1.5-cm-diameter secundum-type atrial septal defect was repaired with a running 4-0 polypropylene suture. The right atrium was then closed and the ascending aorta was opened obliquely. A small tissue fragment was extracted from the noncoronary cusp of the aortic valve which, on inspection, revealed a single shotgun pellet within the surrounding soft tissue. The aortotomy was closed and the patient was successfully weaned from cardiopulmonary bypass. The patient made an uneventful recovery and was discharged home on the third postoperative day with no left hand weakness.

Comment Fig 2. Computed tomographic scan of the chest showing artifactual scatter consistent with a metallic foreign body within the heart.

Embolization of projectiles after penetrating trauma is an infrequent occurrence. The first report of a bullet embo-

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CASE REPORT TAKANO ET AL COMPOSITE GRAFT INFECTION

lus is credited to Davis, who in 1834 described a case of a young boy struck with a wooden missile fragment that migrated to his right ventricle [1]. Rich and associates [2] examined 7,500 cases of vascular injury during the Vietnam war and could find only 22 cases (0.3%) of missile emboli. Reports of embolization of shotgun pellets are more scarce than for larger projectiles. In a recent review, only 28 cases of shotgun pellet emboli have been described since 1960 [1]. Even more unusual than the above is the situation where a projectile embolizes paradoxically from the venous to the arterial circulation. This may occur via one of three routes. The first involves erosion of the missile across the interatrial or interventricular septum in a patient with a direct projectile injury to the heart [3]. A second route of paradoxical embolization occurs when the projectile erodes across blood vessels from the venous to the arterial circulation [4]. A third possible route for paradoxical embolization occurs when the projectile passes across a congenital cardiac defect. The first such description came from Specht in 1917 [5]. Since that time, only 3 more cases of paradoxical embolus by this mechanism have been reported, and in only 1 of these [6] was a patent foramen ovale actually demonstrated. The present report documents the fifth case in the past 80 years of embolism of a projectile from a venous site across an intracardiac defect to the arterial circulation, and is unusual in that the projectile was a shotgun pellet. Perhaps the most unusual aspect of this case relates to the retention of the shotgun pellet in the noncoronary sinus of the aortic valve. The pellet, encased in a small amount of soft tissue, was not held fixed within the sinus, and yet it did not embolize distally. This occurrence undoubtedly reflects containment of the pellet by the flow vortex created within the sinus of Valsalva during systole. Although the turbulent flow patterns within the aortic valve sinuses have been well studied [7], there is little information on prevention of distal embolism of particulate matter by these phenomena. In addition, it was indeed fortunate for the patient that the pellet was not contained within the right or left coronary sinus, with its attendant risk of embolization down a coronary artery [8]. Paradoxical bullet embolus is a very rare occurrence, which can be associated with considerable diagnostic confusion. A careful evaluation of the patient’s injuries and a high level of suspicion are required for the successful identification and management of this condition.

References 1. Yoshioka H, Seibel RW, Pillai K, Luchette FA. Shotgun wounds and pellet emboli: case reports and review of the literature. J Trauma 1995;39:596 – 601. 2. Rich NM, Collins GJ, Andersen CA, McDonald PT, Kozloff L, Ricotta JJ. Missile emboli. J Trauma 1978;18:236–9. 3. Neerken AJ, Clement FL. Air-rifle wound of the heart with embolization. JAMA 1964;189:579– 80. 4. Lam CR, McIntyre R. Air-pistol injury of pulmonary artery and aorta. J Thorac Cardiovasc Surg 1970;59:729–32. 5. Specht VO. Granatsplitter im linken Ventrikel nach Verletzung der Vena femoralis. Munch Med Wochenschr 1917;27: 892– 4. © 1998 by The Society of Thoracic Surgeons Published by Elsevier Science Inc

Ann Thorac Surg 1998;66:564 – 6

6. Schurr M, McCord S, Croce M. Paradoxical bullet embolism: case report and literature review. J Trauma 1996;40:1034– 6. 7. Peacock JA. An in vitro study of the onset of turbulence in the sinus of Valsalva. Circ Res 1990;67:448– 60. 8. Hopkins HR, Pecirep DP. Bullet embolization to a coronary artery. Ann Thorac Surg 1993;56:370–2.

Combined Therapies for Composite Graft Infection After Bentall’s Procedure Tamaki Takano, MD, Yukio Fukaya, MD, Hirofumi Nakano, MD, Hideo Kuroda, MD, and Jun Amano, MD Department of Surgery, Shinshu University School of Medicine, Matsumoto, Japan

We present a patient who suffered from composite graft infection and mediastinitis. After replacement of the infected composite graft, in addition to administration of antibiotics, continuous irrigation of the mediastinum with solutions containing povidone-iodine and cefazolin sodium and transposition of the greater omentum were performed. His postoperative course was uneventful. Combined therapies including mediastinal irrigation and omental transposition should be considered after an operation for composite graft infection complicated with mediastinitis. (Ann Thorac Surg 1998;66:564 – 6) © 1998 by The Society of Thoracic Surgeons

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omposite graft infection is one of the fatal complications that can occur after Bentall’s procedure has been performed. As we have no single decisive therapy for this complication at present, combined therapies are necessary. The purpose of this report is to highlight the combined therapies for composite graft infection. The patient was a 49-year-old man. At the age of 35 years, he underwent Bentall’s procedure with a composite graft (composed of a Bjo¨rk-Shiley valve and a woven Dacron graft) for annuloaortic ectasia. At the age of 45 years, he underwent graft replacement of the aortic arch for Stanford A type acute aortic dissection. He was admitted to our hospital because of sudden fever and left hemiplegia. Cerebrospinal fluid examination and computed tomography of the head revealed a brain abscess in the right frontal lobe. Ultrasonic cardiography showed a vegetation on the prosthetic valve (Fig 1). Blood cultures showed colonies of Staphylococcus aureus. Benzylpenicillin potassium and gentamycin sulfate were given for 2 weeks intravenously and cefazolin sodium was given for 1 week intravenously. Computed tomography of the chest revealed an aortic root abscess 1 month after the onset of fever (Fig 2). Accepted for publication March 2, 1998. Address reprint requests to Dr Takano, Department of Surgery, Shinshu University School of Medicine, 3-1-1, Asahi, Matsumoto 390, Japan.

0003-4975/98/$19.00 PII S0003-4975(98)00510-4