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Clinical case: Penetration of the pericardium: want to learn more about it?

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Clinical case: Penetration of the pericardium

They say that if you're an adrenaline junky, you should pick emergency medicine as your specialiity. Indeed, the emergency room is a place where you will encounter patients with life-threatening injuries and to successfully deal with them, you must be someone who knows a lot and thinks fast.

This clinical case of a man who got his thorax and pericardium penetrated by a rebar is something that will definitely give you a glance at what could be waiting for you, if you decide that the ER is your calling.

Key Facts
FAST exam Focused Assessment with Sonography in Trauma (FAST) is an ultrasound procedure designated to quickly identify free fluid within pericardial, peritoneal and pleural spaces
Pleural effusion Presence of abnormal amount of fluid in the pleural cavity. Depending on the type of fluid, it can be hydrothorax (serous fluid), hemothorax (blood), chylothorax (lymph) and pyothorax (pus)
Pericardial effusion Presence of abnormal amount of fluid in the pericardial cavity. Similarily to its pleural analogue, it is called hemopericardium if the fluid is blood
Pneumothorax Presence of air in the pleural cavity

After reviewing this case you should be able to describe the following:

  • What is meant by a FAST exam? What is evaluated in such an exam?
  • What is meant by a pleural effusion? How a pleural effusion is identified on a PA chest radiograph?
  • What is meant by a pericardial effusion? How a pericardial effusion is associated with cardiac tamponade?
  • What is meant by pneumothorax and how it is recognized radiologically?

This article is based on a case report published in the Journal "Case Reports in Surgery" in 2015, by Caroline C. Jadlowiec, Beata E. Lobel, Namita Akolkar, Michael D. Bourque, Thomas J. Devers, and David W. McFadden.
 

Case description

The patient (42 year-old-male) presented to the ED with a complete thoracic penetration trauma injury (Figure 1).

Figure 1. Photo of the patient in the ED. Note the concave shape of the skin at the entrance site.

The patient had fallen onto a fixed rebar while working on a staircase. The spiral rebar, which was 60 cm long and 8 mm in diameter, penetrated entirely through the thoracic cavity with part of the bar extending beyond the body wall on both sides. The site of penetration was the right anterior axillary line at the seventh intercostal space, and the exit was on the other side at the intersection of the left anterior axillary line and the eighth intercostal space (Figures 1&2).

Figure 2. Preoperative photo showing exit position of the rebar on patient’s left side. Note puckering of skin around rebar.

The patient’s blood pressure at presentation was 90/55 mmHg, his pulse was tachycardic at 120-130 beats/minute, and his oxygen saturation was 92% on room air. The patient, however, was uncommunicative. A FAST (focused assessment with sonography for trauma) ultrasound exam was performed and revealed pericardial effusion, pleural effusion and the possibility of splenic laceration. Accordingly, the patient was considered unstable and immediate surgery was recommended without waiting for any additional radiological investigation.

Management

Because of the thoracic injury and the possible splenic laceration, laparotomy and thoracotomy were performed simultaneously. The laparotomy revealed the absence of intra-abdominal organ injuries (thus, no splenic laceration) and that the diaphragm was completely intact. The extensive thoracotomy allowed the exploration of both hemithoraces and pericardial region concomitantly (Figure 3). It revealed that the rebar penetrated the pericardial cavity; however, no injury was found to either lung, the heart, or to major vessels. The rebar was slowly removed and the surgical procedure was completed. Thorax and mediastinal tubes were removed after postoperative days 2 and 3. The patient was discharged without complications four days after the surgery.

Figure 3. Intraoperative photograph showing rebar within the thoracic and pericardial cavities. the patient’s head is at the top. The blue dashed line indicated the incision through the lower anterior thoracic wall. Two retractors are pulling the incision superiorly.

Surgical and anatomical considerations

Impalement thoracic injuries are usually fatal so this case is very unique. The lungs are the most injured organs in penetrating thoracic traumas. Pneumothorax and/or hemothorax are typically observed as a result of pleurae and/or lung injury.

Figure 4. Diaphragm position.

When there is a penetrating wound into the pleural space that allows external air to enter it, the pressure of that air collapses the lung and prevents adequate ventilation (pneumothorax). If there were any air leaking into pleural space from outside or from damaged lungs, bilateral pneumothorax would have developed and have caused a very quick death in this patient. Further, the rebar penetrated the pericardial cavity and as such, it would seem the patient would have suffered cardiac damage and/or would have suffered from cardiac tamponade. Again, apparently, this did not happen. Additional possible causes of death could have been hemorrhage due to the damage to the great vessels in the mediastinum.

We now must attempt to explain why the patient did not die from any of these conditions. And we want to emphasize that we are speculating; but our speculation is based on both anatomical and physiological principles, plus the information provided in the case report.

Figure 5. A. Preoperative view of the patient with a red dash

Now let's try to project the patient's trauma into the lateral chest radiography and hypothesize the location and course of rebar penetration.

Figure 6. Lateral chest radiograph showing our hypothesized location of the rebar penetration and course. “Right side” indicates the proposed entrance point on the right side of the patient. “Left side” represents the proposed exit point on the left side of the patient.

Questions to ponder

Why was there no significant damage to major viscera?

Figures 5&6 illustrate our hypothesized rendition of the path of the rebar relative to the thoracic wall and viscera. Note that as the rebar traversed the chest from right to left, it not only traveled transversely but also slightly inferiorly and then passed into the right hemithorax as it penetrated the pericardial cavity. This thus explains why there is no right lung damage. But of course, the parietal pleura was damaged, producing the pleural effusion.

The rebar appears to have actually penetrated the chest wall anterior to the right hemithorax (Figures 1&3). The reason we suspect that the heart was not damaged is either that as the rebar was traversing the pericardial cavity, its blunt end pushed the apex of the mobile heart out its way rather than piercing it, or the rebar simply passed through a fat layer overlying the epicardium. Thus, the absence of heart damage. However, the tearing of the fibrous pericardium does explain the pericardial effusion.

Once in the left hemithorax the rebar was slightly lower than it was on the right and actually passed inferior to the left lung but superior to the diaphragm. Remember that the left hemidiaphragm is lower than the right hemidiaphragm. So in this specific location, again there was parietal pleural damage, but no damage to lung tissue or diaphragm. Had the rebar been traveling right to left in eighth intercostal space on both sides (instead of entering through seventh on right and exiting on eighth on left), it is very likely there would have been severe liver and IVC damage.

Why was there not a clinically significant bilateral pneumothorax that caused the patient’s death?

The absence of a pneumothorax would seem explainable by the soft tissues surrounding the entrance and exit wounds sealing around the rebar. Note in Figures 2&5 the concave and convex orientations of the entrance and exit wounds, respectively. Note also in Figure 2 the puckering of skin surrounding the exit wound. We suggest that the rebar and the soft tissue around it sealed the entrance and exit wounds, preventing significant external air from entering the thoracic cavity.

If the rebar was removed at the accident site, a bilateral pneumothorax would have been very likely. This case highlights the importance of not removing any penetrating injury objects before a patient with an impalement injury is taken to surgery. Similarly, because there was virtually no lung damage, there was not any leakage of air into the pleural cavity from the tracheobronchial tree.

Why was there no damage to the great vessels or the diaphragm?

As noted in the case description, the rebar entered and exited the chest near the anterior axillary lines. At this location, the rebar would pass anterior to the great vessels (Figure 6).

With the following learning materials you can learn everything about the heat in situ and the diaphragm. 
 

Clinical case: Penetration of the pericardium: want to learn more about it?

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