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Revista do Colégio Brasileiro de Cirurgiões

Print version ISSN 0100-6991

Rev. Col. Bras. Cir. vol.39 no.4 Rio de Janeiro July/Aug. 2012

http://dx.doi.org/10.1590/S0100-69912012000400008 

ORIGINAL ARTICLE

 

Non operative management of gunshot wounds on the right thoracoabdomen

 

 

Sizenando Vieira Starling, TCBC-MGI; Bruno de Lima Rodrigues, ACBC-MGI; Marcelo Portes Rocha MartinsI; Marcelle Souza Alves da SilvaI; Domingos André Fernandes Drumond, TCBC-MGII

IPrincipal surgeon at Hospital João XXIIII. Hospital Foundation of the State of Minas Gerais (FHEMIG). Belo Horizonte. MG. Brazil
IIHead of Service of General Trauma Surgery. Hospital João XXIIII. Hospital Foundation of the State of Minas Gerais (FHEMIG). Belo Horizonte. MG. Brazil

Address correspondence to

 

 


ABSTRACT

OBJECTIVE: To analyze the results obtained by the introduction of the non-operative management (NOM) of right thoracoabdominal gunshot wounds (GSW)  protocol.
METHODS: A prospective study with data stored in an Excel spreadsheet, in the period from January 2005 to December 2011, with the inclusion criteria: GSW located only in the right thoracoabdominal region, hemodynamic stability, absence of signs of peritonitis and a CT scan carried out.
RESULTS: In the study 115 patients met the inclusion criteria. Most patients (95.6%) were men. The mean age was 25.8 years. Injury indices: RTS 7.7, ISS 14.8, and TRISS 97%. Most patients had thoracoabdominal injuries (62.6%) and 43 patients (37.4%) abdominal injuries. Liver injury occurred in 109 patients (94.8%) and kidney in 28 patients (24.4%). Hemothorax and concomitant intra-abdominal injuries were observed in 72 patients (62.6%). Associated injuries were present in 19 patients (16.5%) and complications in 12 patients (10.5%). NOM failure occurred with 4 patients (3.5%). In this study 2 patients (1.7%) died both due to TBI. The mean hospital stay was 9.4 days. Sixty-seven patients (58.3%) were under control after two months of injury. CT scans of the abdomen showed healing in 58 patients (86.5%).
CONCLUSION: The choice of NOM for penetrating trauma from firearms in the right thoracoabdominal region should be viewed with caution and used only in selected cases using evidence-based protocols and in locations with all the necessary infrastructure.

Key words: Abdominal injuries. Thoracic injuries. Liver. Kidney. Diaphragm.


 

 

INTRODUCTION

Medical care for trauma victims is under constant improvement and has as its main purpose the correct treatment of the patient, with the goal of reducing mortality and occurrences of permanent sequelae.

It can be said, without committing an injustice, that the advent of the use of computed tomography (CT) has changed substantially the approach to, and the treatment of, these patients, independent of the kind - blunt or penetrating,  and the site of trauma - thoracic, cranial, abdominal or skeletal muscle. The preoperative diagnosis, provided by CT, allows a planned and safer approach, favoring the use of new therapeutic options for certain injuries. The non-operative management (NOM) of solids abdominal organs due to blunt trauma is an excellent example of this change. The creation and use of well-designed and defined protocols shows that this approach is safe and reliable.

However, even with the progress of diagnostic imaging, there are still doubts on the approach and handling of patients with penetrating abdominal or thoracoabdominal trauma.

The approach to patients suffering abdominal stab wounds must be different from that for victims of gunshot wounds (GSW). In abdominal trauma from stab wounds the selective treatment has been used, that is, surgery is performed on patients with signs of intra-abdominal injury, namely: evisceration, presence of hemodynamic instability, peritonitis or gastrointestinal bleeding. In GSW the possibility of intra-abdominal injuries is high and the necessity of surgical treatment is the rule. However, the selective approach, choosing not to operate on patients with GSW abdominal or right thoracoabdominal, has been proposed by some authors1-3. To perform this type of treatment, the hospital must be prepared, equipped with human and material resources and have a well-defined protocol and the necessary infrastructure. However it is interesting to note that, to perform NOM safely, it is more important that the institution be well equipped and have a team experienced in treating trauma patients than having a high volume of attended patients.

The objectives of this study are to verify that the non-operative management of patients with gunshot wounds of upper right thoracoabdominal injuries.

 

METHODS

Prospective study of victims of GSW in the right thoracoabdominal region attended at Hospital João XXIII (FHEMIG) in Belo Horizonte between January 2005 and December 2011. Patients who met the inclusion criteria determined by the protocol of the general and trauma surgery department of the said hospital (Algorithm 1) participated in the study. The study was approved by the Ethics Committee.

The data analyzed were age, gender, trauma indices, hemodynamic condition and abdominal examination on admission, CT result, existing injuries, serum levels of hemoglobin, change in symptoms, complications and their treatment, length of hospital stay, occurrence of death and patient follow up.

 

 

The criteria for inclusion in this study were patients with only upper right thoracoabdominal injuries caused by gunshot (entering between the ribs) and that, on admission, had hemodynamic stability, defined as systolic blood pressure greater than 90mmHg and heart rate lower than 110 bpm, and no signs of peritonitis. The right thoracoabdominal area is defined as that upper-bounded by the fourth upper right intercostal space, the sixth lateral right intercostal space and the seventh posterior right intercostal space, and lower-bounded by a line marking the right costal border and medially by the midline of the abdomen. It should be noted that injuries below the costal margin and/or affecting the left side of the abdomen are not considered in the protocol.

The presence of these criteria allows the patient to be studied very carefully by imaging examinations. The performance of CT is part of the inclusion criteria and the examination is essential for the patient to satisfy the protocol criteria.

Patients with right thoracoabdominal injuries may fall into three groups: abdominal injuries only, thoracoabdominal injuries themselves and only thoracic injuries. Patients included in this latter group were excluded from the study. Patients classified in the other groups that show signs of peritonitis and hemodynamic instability on clinical examination or signs of injury to the gastrointestinal tract suggested by imaging studies and those on whom it was not possible to carry out a reliable physical examination were referred for surgical treatment and, therefore, were also excluded from the study.

Then the selected patient is referred to Trauma Support Room (TSR) where he is adequately monitored and subjected to a rigorous clinical examination and monitored at short time intervals, according to each specific protocol. If, during the period of hospitalization, signs of peritonitis appear or, if during monitoring, a persistent fall in hematocrit and hemoglobin levels occurs, then the treatment is discontinued and the patient is referred for surgical treatment or another available less invasive method. Failure of the NOM procedure, defined as the need for surgical intervention for injury treatment or its complications.

Discharge is granted when the patient is well fed, has a regular bowel habit and has no abdominal pain or fever. Patients with liver damage greater than or equal to grade IV, or renal injury greater than or equal to grade III, remain hospitalized until the seventh day when another CT scan is performed to analyze the injury evolution. All patients are instructed to return to outpatients control after fifteen, thirty and sixty days. In this last assessment a chest X-ray and a CT scan of the abdomen are requested to see if the injuries have already completely healed. Long-term monitoring is performed at 6, 12, 18 and 24 months after the date of the injury.

The variables were described using measures of central tendency. The student's t-test was used to test differences in the means. Pearson's chi-squared test was used to test differences between proportions.

 

RESULTS

During the study period 115 patients met the inclusion criteria. Regarding gender distribution, 110 patients (95.6%) were male. The mean age was 25.8 years, ranging from 15 to 78. All patients were stable on admission and no signs of peritonitis. The mean overall trauma indices observed were RTS 7.7, ISS 14.8 and TRISS 97%. The average dosage of hemoglobin on admission was 10.7g/dL and at discharge was 8.9g/dL. Transfusion was performed on 17 patients (14.7%) with an average of 1.8 units of red blood cells per patient.

Computed tomography of the abdomen was performed on all patients and the lesions found are described in table 1. The vast majority of patients had thoracoabdominal injuries (62.6%) while in 43 patients (37.4%) the wound was entirely abdominal. Liver injuries were found in 109 patients (94.8%) and their classifications are shown in table 2. The commonest injuries were grades II and III. Renal injuries occurred in 28 patients (24.4%) and their classifications are shown in table 3. Hemothorax and concomitant intra-abdominal injury was found in 72 patients (62.6%), so in that particular group it can be inferred that a phrenic injury was present.

 

 

Injuries associated with other regions, excepting the chest and abdomen, were present in 19 patients (16.5%) the most common being fracture of the thoracolumbar spine. During the period 20 patients (17.4%) repeated imaging tests (ultrasound or CT). The main reasons for repeating the test were a change of symptoms and a progressive decrease in hemoglobin. Complications were present in 12 patients (10.5%) and are listed in table 4. Failure of the NOM procedure occurred in 4 patients (3.5%) and their characteristics are described in table 5. Interestingly, liver damage was present in all patients that failed NOM and the recommendation for surgery was directly related to it. In this study two patients (1.7%) died both due to associated TBI, one on the fifth day after injury and the other on the eleventh. The mean hospital stay was 9.4 days; for patients who didn't developed complications it was 6 days, and for those who did, 12.5 days.

 

 

Regarding follow-up after hospital discharge, 67 patients (58.3%) had recovered two months after injury. All of them underwent CT of the abdomen which showed healing and an unaltered thorax in 58 patients (86.5%), a liver cyst in 3 patients (4.5%), a renal cyst in one patient (1.5%) and injuries with a reduced size and in the healing phase in five patients (7.5%). After two years of follow-up, only 45 patients showed up, even after active searches for the patients. It is interesting to note that the families of ten patients from this study said that they had been victims of new gunshot attacks and had subsequently died. For the 45 patients who showed up, their chest X-rays showed no direct or indirect alterations in the phrenic injury. The nine patients, who showed changes in their CT after two months, showed up to all reviews. In the last follow-up, after 24 months, only two patients remained with a liver cyst, although their sizes were diminishing.

 

DISCUSSION

Penetrating trauma injuries in the upper right thoracoabdominal area affect mainly the following organs: liver, right lung, right diaphragm, right kidney, duodenum, liver angle of the colon and the inferior vena cava. The colonic duodenal and inferior vena cava injuries require immediate and routine surgical treatment. Thoracic drainage is the treatment used routinely for lung injuries. The discussion about the best treatments for liver, renal and phrenic injuries still generates controversy. The option to perform NOM in carefully selected cases of GSW has already been discussed by various authors1-3,5-10 and there are several justifications for adopting this type of conduct.

Until the advent of the use of imaging the vast majority of surgeons opted for mandatory laparotomy for penetrating abdominal and right thoracoabdominal injuries, principally those caused by firearms. In these cases it was not important whether the clinical examination was uncertain or not, nor the eventual projectile trajectory2. Even in cases of doubt about penetration of the abdominal cavity, laparotomy was justified. However, these studies are not clear in relation to surgical findings during the perioperative period, in other words, what the real frequency of therapeutic and non-therapeutic laparotomy was. The arguments for this type of conduct can be summarized as follows: abdominal and right thoracoabdominal GSW are associated with a high frequency of intra-abdominal injury which requires surgical treatment11,12, a non-therapeutic laparotomy is the safe procedure13, a delay in operating on  asymptomatic patients having abdominal injuries is associated with an increase in morbidity and, finally,  the initial clinical examination is not a reliable method to exclude abdominal11 injury, that is, the abdominal injuries cannot be safely diagnosed without laparotomy.

In fact, many studies show that 20-30% of patients with abdominal gunshot wounds underwent unnecessary laparotomies1,2,10,14.15. Regarding the initial physical examination, and principally subsequent examinations, their credibility and reliability, when performed by an experienced physician and by the same team, show criteria for a recommendation regarding the level 2 of evidence16. That credibility and reliability are even more intense in patients with GSW than those with stab wounds, since in most cases, a larger number of intra-abdominal viscera are injured in patients with gunshot wounds, as well as the injuries being more serious and more severe when measured by trauma indices. Therefore, in these patients, signs of peritonitis are early and more exuberant1,2,7. Another important and widely discussed argument is the incidence of morbidity and mortality, both locally (surgical site infection, incisional hernia, intestinal obstruction from adhesions, etc.) and systemically, (pneumonia, atelectasis, urinary tract infection, etc.) in non-therapeutic laparotomies. Several studies reported indices of complications ranging from 2.5 to 41.3%14,15,17,18.

A major problem in relation to NOM is the presence of injuries to hollow viscera not detected in the initial evaluation. To avoid this happening beyond the follow-up clinical examination it's convenient to use supplementary diagnostic methods such as arterial blood gas analysis, doses of serum lactate and repeated imaging exams as necessary. It should be emphasized that missed injuries treated within a few hours after injury, especially those of hollow viscera, are not related to a significant increase in morbidity and mortality2, 6,7,19. Therefore these patients can be safely observed until suggestive signs arise, on physical examination, which indicate the need for surgical treatment. A 24-hour observation period is considered sufficient to rule out associated abdominal injuries19, 20. If during this period of observation doubt prevails then surgical treatment is necessary. In trauma, laparotomy continues to be the most accurate propaedeutic. Additionally, the incidence of missed injury in those patients selected for NOM is extremely small. The largest sample shows the frequency of missed injuries as 0.6% and the index of complications in patients operated on for late-diagnosed injuries was 6%8. In this study we did not observe any missed abdominal injury and the only patient who was operated on with this suspicion had a non-therapeutic laparotomy.

With the advancement of trauma care already mentioned, patients with penetrating trauma, and who are admitted to emergency hemodynamically stable and without evident signs of peritoneal irritation, deserve a chance to be evaluated meticulously in search of a more detailed diagnosis concerning possible injuries present and therefore to avoid emergency surgery. Currently there are methods available that allow this precision. It is only after studies such as this, that the safest and most effective treatment can be chosen. The unequivocal progress and advancement in CT image quality, even in three-dimensions, can provide us a detailed study of the trajectory of a projectile from a firearm, determining whether or not there is penetration of the abdominal cavity. In addition, CT shows the presence of visceral injury (liver or kidney), its classification21, the presence, location and estimated quantification of intracavity free fluid, allows diagnosis of possible complications and finally documents the evolution of the healing of injury. It has adequate specificity and sensitivity for these findings22,23.

Studies have shown CT to be safe, cost effective and fast in the evaluation of patients with right thoracoabdominal GSW24,25. Important also is that the presence of intravenous contrast leak (blush) is indicative of active bleeding. This finding, in itself, is an important predictor of NOM failure26. In this circumstance, trying to perform NOM necessitates the performance of angiography and embolization of the damaged vessel. Analyzing these characteristics it can be concluded that CT makes a selective approach to these patients safer, having evidence of recommendation level 216. It is an excellent tool that adds important information to, but not replaces, the clinical examination of the patient as the main criterion for choosing NOM in thoracoabdominal right trauma by GSW. Therefore, there are occasions to institute NOM, but it is advisable and necessary that this group of patients be identified and safely selected in order to avoid an increase in morbidity and mortality12,27.

Undoubtedly the liver is the organ most damaged by this type of trauma. Liver injury has certain important features that permit the performance of NOM. This approach was initially adopted in victims of blunt trauma. The success  of NOM in cases of blunt liver injury is great reaching rates as high as 98.5% in multi-centric studies28. In the majority of cases, bleeding from liver damage ceases spontaneously because it is of venous origin and of low pressure. This fact is often noted by the surgeon during surgery on a liver injury in a hemodynamically stable patient29,30. However, if during surgery this injury were unpacked, voluminous bleeding often occurs, with a difficult hemostasis and requiring complex surgical maneuvers to stop the bleeding, but with high morbidity31. In some circumstances the bleeding is so heavy and the injury so severe that a satisfactory hemostatic result cannot be achieved with conventional techniques, necessitating the use of maneuvers proposed by Damage Control Surgery. All this happens in a patient who was hemodynamically stable with no active bleeding!

Another important characteristic which must be considered is that to obtain a complete and secure approach to liver surgery, one should take into consideration the size and location of the organ. Due to this detail, during the act of surgery it is necessary to obtain a incision with ample access, using special adjustable retractors and release all hepatic ligaments, especially when there are posterior and superior injuries.

The liver parenchyma has great capacity for healing and regeneration, either from traumatic or surgical injury, keeping its tissue architecture preserved. Work in experimental models show that, 3-6 weeks after the occurrence of injury, the force required to break the scar that has formed is equal to that required to damage the normal parenchyma, regardless of whether the liver injury was sutured or not32. This healing ability is one of the most important factors in the indication and success of non-operative treatment of liver injuries, even on those considered extensive.

Based on these characteristics, coupled with accurate diagnosis that CT allows, several surgeons have been successful in the non-surgical approach of penetrating hepatic injury3, 5,9,10,33. The analysis of results of existing studies in literature are surprising and encouraging, showing success rates ranging from 67% to 100% 3,6,9,10,33. Undoubtedly, the vast majority of patients with right thoracoabdominal GSW will require a laparotomy for treatment of their injuries. However there are a number of patients ranging from 6.5% to 40% who do not initially require surgery3, 6,9,10,33,34. The correct selection of these patients, although difficult, is essential for NOM to be safe and successful. Attention should be drawn to two specific situations: the first is when the projectile is located in the liver mass. In this circumstance the likelihood of NOM success is greater. The other situation is when the injury reaches the V segment; in this case attention should be paid to the concomitant lesion of the gallbladder. As in blunt trauma, NOM can be safely performed on all degrees of liver injury GSW, including those classified as grades III to V, which are considered complex injuries10,31,35.

The other viscus often injured in right thoracoabdominal GSW is the right kidney. The main goal of kidney injury treatment is to preserve the kidney. NOM also can be used with success in renal injuries. The use of excretory urography for diagnosis and guidance regarding the procedure is one of the factors that allows the use of NOM earlier on in the treatment of blunt renal trauma. In most cases, the bleeding arising from renal injury ceases spontaneously because it is self-limited and is contained in the retroperitoneum being buffered by the Gerota's fascia.

An excretory system lesion causing a urine leak, when present, is another major concern for the surgeon. With the advancement of endoscopic manipulation of the urinary tract, especially with the use of a Stent (double J) within the renal pelvis, injuries to the calyx and renal pelvis can be addressed in this way without the need for conventional surgery. An exception being when there is total rupture in the pyeloureteral junction.

In penetrating trauma, mainly by gunshot, the surgical treatment of renal lesions is the most suitable due to the high frequency of intra-abdominal associated injury36-38. The major disadvantages of this approach are the high rates of nephrectomy and unnecessary exploration of the kidney. Some authors advocate, even in the perioperative period, not to open the Gerota's fascia and not to explore the injury in selected cases: in low-grade renal injuries and without extravasation of the CT and of lateral hematoma, or small and not expansive ones39. This is because in patients with grade I and II renal injuries, when surgically explored, the bleeding has already ceased and any other hemostatic procedure is not necessary. This type of procedure is considered by these authors as non-operative treatment39-41. The use of CT provides important information such as injury classification, it studies the renal vasculature, checks for ischemic segment and principally it visualizes the contrast leak in the excretory system. Therefore it is important to perform this late stage in these patients.

Based on these assertions it was proposed, in well-selected cases, to use NOM for kidney injury itself, that is, not to operate on the patient. For penetrating GSW the selection of patients for NOM should be made carefully and strictly follow the proposed inclusion criteria. It is recommended to pay a lot of attention to the location of the perforations caused by the projectile, especially the entry point.

The anatomical location of the right kidney, especially considering its proximity to the liver, favors that this approach be adopted for right thoracoabdominal GSW, especially when the entry point is posterior. Nevertheless, it should be noted that the hepatic angle of the colon  may, in some situations, stand between the right kidney and the liver. Therefore, we must be especially careful when the entry point is posterior and there is kidney damage and concomitant liver.

The reconstruction of the trajectory of the projectile by means of axial, coronal and sagittal views during a CT scan with multi-detectors is essential to rule out injury to the large intestine. If in doubt, surgery is the safest option. The authors who propose this approach manage to achieve it with 10% to 40% of renal GSW, obtaining a success rate ranging from 91% to 100%37,39-42. NOM reduces the index of nephrectomy because it provides a greater chance of renal preservation, a decrease in the rate of complications such as acute renal failure, and also in the possibility of unnecessary surgery40,41. NOM for GSW was initially proposed for simpler injuries, but today it is also adopted for complex injuries43. Injuries with contrast leak of the excretory system have a higher possibility of complication and NOM failure43.

In relation to the injury of the right diaphragm, without doubt, one can say that currently there is no consensus about what is the best approach to adopt when the diagnosis is made before surgery. There is much discussion about the possibility of hernia on the right. The natural evolution of an isolated injury to the right diaphragm is not yet known, in other words, if the injury heals spontaneously or not.

Experimental studies with pigs and mice suggest that there is strong evidence of spontaneous healing in around more than 90% of injuries44-47. In reviewing these studies it is important to take into consideration the location and direction of the lesion (if it is in part of the tendon or diaphragm muscle) as well as its extension.

Another important factor to be remembered is the protection afforded by the liver that, theoretically, would block the hole of the injury thus preventing the migration of abdominal viscera into the thorax. However, there are no studies that effectively document spontaneous healing in all right diaphragmatic injuries. Indirect evidence exists.

In patients who undergo NOM for right thoracoabdominal penetrating injuries in themselves, the diaphragmatic injury is not addressed, so theoretically, the frequency of complications such as biliothorax should occur with some frequency. However publications on this type of approach to this complication is rare or absent3,6,9,10,33,34.

Rezende Neto et al claim  that the presence of bile in the liquid drained from the thorax does not exclude the possibility of performing NOM in cases of right thoracoabdominal GSW, provided that the patient is properly selected and monitored. However, persistent elevated bilirubin levels can be considered as a predictive factor in NOM failure.

A reliable and non-invasive method of imaging is still not available to prove spontaneous healing of right diaphragmatic injuries. The use of video endoscopy to confirm this healing in asymptomatic patients is ethically unjustifiable. Thus it is strictly necessary, when performing NOM, that patients are grouped using imaging methods for a longer period of time. In this study, 39.2% of patients underwent monitoring for two years post-trauma with chest X-rays and didn't show any signs of diaphragmatic hernia.

There is growing evidence that non-operative treatment of abdominal injuries of abdominal solids organs by NOM is feasible and safe. Around a third of all abdominal trauma or thoracoabdominal GSW can be approached non-operatively2,7,8,49. To perform NOM for right thoracoabdominal GSW it is necessary to check the exact location(s) of perforation(s), conduct a thorough clinical evaluation with special attention to the hemodynamic condition and examination of the abdomen and have a detailed imaging study of the trajectory of the projectile. Another advantage of this approach is to allow less invasive techniques (endovascular, endoscopic and percutaneous) to be used in the treatment of injuries to the solids organs and their complicações10, 35. Como et al16 made the following recommendations based on a level of evidence: a routine laparotomy is contraindicated in hemodynamically stable patients with abdominal injury GSW if the same were tangential and the patient had no signs of peritonitis (level 2); patients with isolated penetrating injuries in the right thoracoabdominal region can be treated without a laparotomy in the presence of stable vital signs, a reliable physical examination and with no or minimal abdominal pain (levels 2 and 3). The authors conclude the study by saying that NOM for penetrating injury trauma of solids organs (liver and kidney) require further studies. The data presented here corroborate, once again, the safety in performing NOM in selected cases of right thoracoabdominal GSW.

The approach to abdominal trauma is changing; the performance of NOM is possible both in blunt trauma and penetrating trauma. Undoubtedly one of the greatest dilemmas for the trauma surgeon, at the present time, is to decide whether routine surgical treatment is really the best option for patients with GSW to the upper right thoracoabdominal region or whether, under pre-established and well defined conditions, non-operative treatment can be performed safely.

In opting for NOM, the great challenge is to decrease the rate of unnecessary laparotomies without an increase in morbidity and mortality from intra-abdominal injury not diagnosed during the initial examination. Even authors who advocate mandatory surgical treatment recognize that, despite the risks, NOM could be performed provided that there is a protocol in place, so that it can be done safely and in the correct environment50

Despite the good results achieved in this study, the option of performing NOM for penetrating GSW in the upper right thoracoabdominal region should be viewed with caution and used only in well selected cases using evidence-based procedures and in locations with all the necessary infrastructure. In the absence of professionals experienced in this type of approach, and qualified in selecting and properly monitoring patients, explorative surgery is still the safest method of treatment. However the option of performing NOM when the necessary conditions are present is not only scientifically  correct but ethically justifiable.

 

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Address correspondence to:
Sizenando Vieira Starling
E-mail: sizastarling@bol.com.br

Conflict of interest: none
Source of funding: none

Received on 15/01/2012
Accepted for publication 18/03/2012

 

 

Study carried out at Hospital João XXIII. Hospital Foundation of the State of Minas Gerais (FHEMIG). Belo Horizonte. MG. Brazil.