Successful management of a combined cardiopulmonary penetrating injury: a case report.

Background: Penetrating thoracic injury is a type of critical illness with a high mortality rate, which often involves the heart, large blood vessels, and lungs. Penetrating cardiac injury is a very serious condition, and most patients die rapidly within minutes due to hemorrhagic shock and acute cardiac tamponade. Due to the critical condition and rapid development of this type of injury, most patients die before reaching the hospital. It is rare in clinical practice and difficult to treat. Case Description: Our hospital recently admitted a case of penetrating cardiac injury. In this case, a 50-year-old male was admitted to the hospital following "a fall from a height [that] caused steel bar[s] to penetrate the chest cavity for 7 hours before he arrived at the hospital". The patient fell from a height of 3meters at a construction site, which caused 2 steel bars to penetrate his chest. The patient presented with symptoms such as chest pain, dyspnea, and apathy. Chest computed tomography suggested combined cardiopulmonary penetrating injury. Echocardiography suggested penetrating cardiac injury, and moderate pericardial effusion. After the patient was sent to the Emergency Department of our hospital, the relevant laboratory examinations and an emergency surgery were performed. The rescue team consisting of cardiac surgery, thoracic surgery, anesthesiology, emergency department, and imaging department specified the treatment plan. Under general anesthesia, cardiopulmonary bypass was performed via right femoral arteriovenous cannulation. The steel bars were removed, the left atrial posterior wall and ventricular septal perforation were repaired, and the great cardiac vein was sutured. Coronary artery bypass surgery was performed at the same time, and the anterolateral lung tissue of the left lower lobe was resected. Postoperative treatment was given to prevent against infection and improve cardiopulmonary function. The patient recovered well, and he was discharged from the hospital. The results of the follow-up 1 year after surgery were normal. Conclusions: Timely treatment and a reasonable operation mode is essential in treating this kind of trauma. A joint diagnosis and treatment by a multidisciplinary team can enable a comprehensive assessment of the condition to be made quickly and an optimal treatment plan to be formulated. 2022 Annals of Translational Medicine. All rights reserved.

Introduction

Penetrating thoracic injury is a complex and serious injury that often results in hemorrhagic shock. When combined with cardiac and great vessel injury, the condition is critical, the development is rapid, and the fatality rate is extremely high. Penetrating cardiac injuries are highly deadly; most patients die before reaching the hospital, and the prehospital mortality rate has been reported to be as high as 94% (1). Penetrating cardiac injury is highly lethal with mortality rates of 70–80% (2). Cardiac injury occurs in about 20–30% of cases of major chest trauma (3). Penetrating chest injury can cause intracardiac injury at various sites, of which the right ventricle (43%) is the most common, followed by the left ventricle (33%), right atrium (15%), left atrium (6%), and intrapericardial great vessels (6%) (3). The incidence of a traumatic ventricular septal defect is 1–5% (3). The 2 most common causes of death in individuals with penetrating cardiac trauma are hemorrhagic shock and cardiac tamponade (4). As time is extremely crucial in almost all of traumatic injuries, early yet focused and careful evaluation is the key to early intervention and can improve mortality and morbidity. We present the following article in accordance with the CARE reporting checklist (available at https://atm.amegroups.com/article/view/10.21037/atm-22-3866/rc).

Case presentation

The patient, a male, aged 50 years, was admitted to the hospital following “a fall from a height [that] caused the steel bar[s] to penetrate the chest cavity for 7 hours before he arrived at the hospital”. The patient fell from a height of 3meters at a construction site, which caused 2 steel bars to penetrate his chest. The patient presented with symptoms such as chest pain, dyspnea, and apathy. The patient was in good health and had no family history of the disease. Of the 2 steel bars, 1 penetrated the chest by the right back and exited by the left anterior chest, while the other obliquely penetrated from the right back to the left back of the chest wall. The patient was lying in a bed when admitted to hospital.

A physical examination revealed 3 bleeding wounds, but there was no clear bleeding tendency. The steel bar that vertically inserted and penetrated the chest formed a 110-degree angle with the body (see ). The steel bar was swinged with heartbeat very obviously. The preliminary diagnosis was a penetrating chest injury, a penetrating heart injury, and lung injury.

Figure 1

Two steel bars penetrated the patient’s back.

Figure 2

A steel bar passed through the patient's left anterior chest.

The patient was conscious, and his blood pressure was maintained at 110 mmHg. His heart rate was stable at 100 beats per minute with a normal oxygen saturation, and his central venous pressure was not high. Enhanced computed tomography (CT) scans showed that the steel bar pierced the heart near the left atrium and exited beside aortic root and thus was very likely causing damage to the ventricles (see ).

Figure 3

A sagittal CT scan showed the steel bars passing through the patient’s body. CT, computed tomography.

Figure 4

CT 3D imaging showed the steel bars penetrating the thoracic cavity. CT, computed tomography; 3D, three-dimensional.

An emergency thoracotomy was not considered, as the patient was stable. A multidisciplinary team formulated the treatment plan. The preparation of the surgical treatment in the operation room was done very quickly, and at the same time, the patient’s blood was typed and cross-matched.

As the steel bar forms a certain angle inside and outside of body, it could not just be pulled out from the chest, and we could only pull it out from the back side. Taking into account the need for surgery, we cut off the part of bar outside the body very close to the chest wall, paying continual attention to any wound bleeding in the cutting process. Next, the patient placed in the supine position for the general anesthesia and placed on an esophageal ultrasound.

A median incision was chosen because of the position of the bars. Additionally, as a cardiopulmonary bypass (CPB) by the aorta to the inferior vena cava and the superior vena cava was not viable, we used a femoral artery and femoral vein in the CPB operation. After the CPB was performed, we opened the chest and pulled the chest very slowly under the guidance of esophageal ultrasound to prevent a cardiac rupture being caused by removing the bar.

After the chest was opened, we discovered that the steel bar pierced the heart from the left atrium close to the pulmonary vein side to the ventricular septum beside the right ventricular outflow tract (see ). This was further confirmed by a cardiac exploration that was performed after the right atrium and atrial septum were cut open. Next, we pulled the steel bar out very slowly from the left chest and confirmed that the bar did not injure the mitral valve, tricuspid valve, or any other important structure of the heart. The reparation of heart damage proceeded smoothly, but we observed that the left ventricular movement was reduced when stopping the CPB. It was highly possible that this was caused by the steel bar injuring the septal branch of the left anterior descending branch. Thus, we performed coronary artery bypass grafting (CABG) from the aorta to the left anterior descending branch with the great saphenous vein.

Figure 5

Intraoperative exploration revealed that a steel bar was penetrating the heart.

The wounds on both sides of the lung, chest and back were fixed after the CPB was completed. We then closed the chest and sent the patient back to the intensive care unit. The total operation time was 6 hours. The CPB time was 165 min, and the aortic occlusion time was 55 min. Postoperative treatment was given to prevent against infection and improve cardiopulmonary function. The patient recovered well, the reexamination results were satisfactory, and he was discharged from the hospital. The results of the follow-up 1 year after surgery were normal. The patient was followed up by telephone and said that the operation was successful. He basically returned to normal work and life after the operation. The timeline of the patient diagnosis and treatment process is shown in .

Figure 6

Timeline. ICU, intensive care unit; EF, ejection fraction; PAP, pulmonary arterial pressure.

All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee(s) and with the Declaration of Helsinki (as revised in 2013). Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the editorial office of this journal.

Discussion

Penetrating cardiac injuries are emergencies that require prompt surgical management. These injuries commonly require operative management. Patients who have unstable presentations may be temporized treated with a pericardial drain or fluid resuscitation, and when in extremis, may require an emergency room thoracotomy. Patients who are stable enough require a prompt transfer to a center with cardiothoracic and trauma expertise (5). The clinical manifestations of cardiac penetrating injury include the complete instability of the hemodynamics, acute hemorrhagic shock, complete respiratory, and cardiac arrest. In addition, its clinical manifestations are related to several factors, including the trauma mechanism, the length of time before arrival at the trauma center, the extent of injury, and whether there is lung injury. Regardless of whether the amount of blood loss is more than 40–50% or whether there is cardiac filling, penetrating heart wounds lead to the occurrence of cardiac shock in patients (6,7).

Penetrating cardiac injury requires urgent treatment, and the main causes of death of such patients are cardiac filling or bleeding caused by shock. Only 10–25% of such patients are still alive when they arrive at the hospital, and only 20% of such patients are stable (8,9), which is mainly due to the wound being sealed off by the foreign body (10). If this occurs, surgical treatment can have good results and the survival rate can be as high as 89% (10).

The localization of cardiac foreign bodies can be assisted by multiple imaging modalities including transthoracic echocardiogram (TTE), fluoroscopy, and CT as appropriate. TTE is a very useful tool for detecting cardiac injuries and represents the primary screening tool in unstable patients with chest trauma. CT is currently recommended as the initial imaging modality for hemodynamically stable patients (11). CT scans provide more information compared to X-ray about the cardiac wound and the presence of pericardial blood effusion and better display the position of the foreign body. In this case the performance of cardiac tamponade was not found but the steel penetration through the heart was observed on CT examination.

In cases of penetrating cardiac injuries, the foreign body should never be pulled out in an emergency department in any situation. These foreign bodies should be removed in a fully equipped operating room where an immediate thoracotomy can be done, as the foreign body may occlude the entrance site of major cardiovascular structures, thereby preventing bleeding (12,13). Median sternotomy is widely used, as it provides a clear view of frontal injuries and permits the repair of the majority of lesions as it did in this case (14).

The use of CPB is very necessary in patients with a clear heart injury. It can accurately and clearly repair heart damage and can repair the damage of the coronary artery at the same time (15). In this case, the CABG from the aorta to the left anterior descending branch improved the blood supply of the heart. This definitive repair can be realized with continuous or separate stitches, with 3-0 diameter polypropylene sutures, using pledgets, preferably in ventricular wounds. The surgeon should cover as much myocardial tissue as possible, as superficial repairs can cause more injuries to the fragile tissue around the wound (16).

A steel bar through the heart is very rare. Correctly diagnosing the patient and maintaining patient stability until surgical treatment can be administered are key to the survival of patients. Following the treatment of this patient, the author summarized the process by which the penetrating cardiac injury was treated at our hospital. The process was as follows: (I) a rapid diagnosis and timely surgery, which guaranteed the good prognosis of the patient; (II) a preoperative ultrasound combined with CT to confirm the diagnosis. (In the cases of stable hemodynamics, CT is the first choice); (III) the establishment of a CPB through the femoral artery and vein, which is a fast, safe and effective surgical method; and (IV) postoperative standardized and adequate anti-infective treatment.

Limitation

There were no similar cases that could be used for controlled studies. We will continue to accumulate data on similar cases.

The article’s supplementary files as