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    Life-threatening complications of ascariasis in trauma patients: a review of the literature

    2014-11-27 04:35:47QuanyueLiDonghaiZhaoHaiyanQuChuannongZhou
    World journal of emergency medicine 2014年3期

    Quan-yue Li, Dong-hai Zhao, Hai-yan Qu, Chuan-nong Zhou

    1Department of Pathology, 303 Hospital of the Chinese People's Liberation Army, Nanning 530021, China

    2Department of General Surgery, 303 Hospital of the Chinese People's Liberation Army, Nanning 530021, China

    Corresponding Author:Chuan-nong Zhou, Email: zcn6770@sina.com

    Life-threatening complications of ascariasis in trauma patients: a review of the literature

    Quan-yue Li1, Dong-hai Zhao2, Hai-yan Qu2, Chuan-nong Zhou1

    1Department of Pathology, 303 Hospital of the Chinese People's Liberation Army, Nanning 530021, China

    2Department of General Surgery, 303 Hospital of the Chinese People's Liberation Army, Nanning 530021, China

    Corresponding Author:Chuan-nong Zhou, Email: zcn6770@sina.com

    BACKGROUND:Ascariasis is one of the most common human parasitic infections worldwide. In some rare cases, ascariasis may cause serious consequences even sudden death. This study was undertaken to review the life-threatening complications of ascariasis in trauma patients reported in the literature.

    DATA SOURCES:Relevant articles about ascariasis and trauma were searched from Pubmed, Google scholar, Scirus, and Wanfang databases.

    RESULTS:Twenty-four patients with ascariasis were collected from 21 articles searched. Most of these patients were from tropical and subtropical countries. Of the 24 patients, 12 were children. Their major complications occurred in the airway passage and digestive tract. There were 3 fatal cases in these patients. Twelve of the 24 patients described in 10 articles were reported in the last 10 years.

    CONCLUSIONS:Early diagnosis and prompt intervention are essential to minimize the high morbidity and mortality of these serious complications in trauma patients. Physicians should be aware of the possibility of Ascaris infection in a trauma patient from endemic area of ascariasis. History of Ascaris infection and routine examination of feces for Ascaris eggs may be helpful to make a correct diagnosis.

    Ascaris lumbricoides; Ascariasis; Trauma; Emergency medicine; Surgery; Complications

    INTRODUCTION

    Ascariasis is one of the most common human parasitic infections worldwide, especially in developing countries. Ascariasis occurs frequently in tropical and subtropical regions, and in any areas with inadequate sanitation. Estimated 1.5 billion persons were infected with Ascaris in 2002. Children are infected more often than adults.[1]Severe Ascaris infections cause approximately 60 000 deaths per year worldwide, mainly in children.[2]Parasitic diseases are one of major public health problems, and ascariasis is common in China. Considerable progress in prevention and treatment of this infection has been made during the past decades. According to the data of the national survey carried out from June 2001 to 2004 compared with those of the national survey performed in 1990, the prevalence of ascariasis was declined by 71.29%. However, there are still 85.93 million people infected with Ascaris in China.[3]Most patients infected with Ascaris have a chronic disease course and remain asymptomatic for years or present with only mild symptoms. In some rare cases, ascariasis may cause serious consequences, even sudden death.

    Traumatic injuries are one of signi fi cant public health problems worldwide and may affect all age groups. About 5 million people worldwide died from injuries in 2000, and injuries accounted for 9% of the deaths in the world in 2000 and 12% of the world burden of diseases.[4]Complications are very common in trauma patients and contribute greatly to morbidity and mortality. Recently, Osler et al[5]have analyzed the data of 409 393 trauma patients and found a total of 175 299 complications in these patients. And 24% of the patients had at least onecomplication. However, the presence and significance of Ascaris infection in trauma patients has rarely been reported. In fact, life-threatening complications of ascariasis may occur in trauma patients. This study was undertaken to review the literature on ascariasis, while emphasizing the awareness of Ascaris infection in some rare cases.

    DATA SOURCES

    The data in articles were searched from Pubmed, Google scholar, Scirus, Chinese Wanfang databases with key words "Ascaris", "trauma" and variations of these terms.

    RESULTS

    Complications of ascariasis in the airway passage Ascaris obstructing the larynx

    Lapid et al[6]reported a ten-year-old girl hospitalized with burns to 45% of her body surface area, including the face. The girl was intubated upon admission and mechanically ventilated. Four days later, she was faring well enough to be extubated. But she was reintubated 15 minutes later for acute respiratory distress, inspiratory stridor and severe hypoxemia. Laryngoscopy disclosed an unidentified tubular object which obstructed the opening of the larynx. It was removed and identified as a 35-cm long Ascaris roundworm. It was estimated that 20–25 cm of the worm was located in the trachea and bronchi prior to removal. After the removal, her respiratory condition dramatically improved.

    Finsnes[7]reported a 7-year-old girl who was severely wounded in an explosion incident. She was injured in the chest and had a penetrating wound to the right lung, diaphragm and liver. She had an abdominal surgery and stayed in the intensive care unit for 5 days, and made a remarkable physical recovery in the first week. The girl was given a general anesthetic for removal of a large number of stitches on her chest, back and abdomen. She slept in the recovery position for the following hour. At this point, she suddenly developed upper airway obstruction with falling SpO2from what appeared to be laryngospasm. A triple airway manoeuvre (head tilt, jaw thrust, and mouth opening) was performed, and then part of a worm protruded from her mouth. She quickly recovered after removal of a 30-cm long female Ascaris worm from her larynx. At last, she was successfully treated.

    Ascaris in the trachea

    Wu et al[8]described a 50-year-old woman with tetanus due to wound of the left foot 5 days before her admission to the hospital. She had frequent dyspnea and convulsion. She underwent a tracheotomy and showed stable vital signs without any spasms. However, on the second day of her hospital stay, a 10-cm long Ascaris worm was aspirated from the pharynx. On the 6th day she had an attack of severe dyspnea, agitation, frequent convulsions and cyanosis. Drug intervention showed no effect, but all the symptoms were resolved after removal of a 10-cm long Ascaris worm from the trachea by aspiration. Similar events happened twice again 2 days and 4 days later, and both were resolved after removal of a 10-cm long Ascaris worm from the trachea. The patient received anti-helminth treatment and 40 Ascaris worms were expelled in the stools. She recovered well and was discharged after a 40-day stay in the hospital.

    Ascaris obstructing the tracheal tube

    Imbeloni[9]described a fatal case that a man admitted to the hospital after being struck by a car. He was comatose and developed respiratory failure. He was intubated and mechanically ventilated, with resultant improvement of blood gases and vital signs. After two days his orotracheal tube was changed because of the presence of thick secretions. Three hours later he developed acute respiratory failure and cardiac arrest and could not be resuscitated. Autopsy revealed a long Ascaris worm in the endotracheal tube.

    Gan[10]described a 56-year-old man who was hit at his head by a dropping heavy object from a high place at 3 hours before his admission to the hospital. He underwent a repairing operation for the depressed skull fracture and had a tracheotomy. On the 10th day after surgery the comatose patient developed sudden dyspnea and cyanosis. Aspiration of sputum did not help at all, but the patient recovered promptly after removal of a 12-cm long live Ascaris worm which obstructed the tracheal tube.

    Xuan[11]reported that a 12-year-old comatose boy was admitted to the emergency department. He had a depressed skull fracture and brain contusion. He underwent tracheotomy after admission to the hospital. On the third day of his hospital stay, he had sudden dyspnea. The respiration returned to normal as soon as a 15-cm long Ascaris worm was found and pulled out from the endotracheal tube during sputum suction. The boy was discharged after a 34-day stay in the hospital.

    Bailey and Wainer[12]reported a 9-year-old boy who suffered a high-voltage electrical injury on the posterior scalp and right neck. On his second hospital day an Ascaris worm was removed from his oral cavityduring routine care. Thus, he received a treatment with mebendazole. An initial excision and temporally wound coverage were completed on hospital day 4. The boy remained stable postoperatively for 1–2 hours, and at that time he had a respiratory arrest which necessitated chest compressions and vasopressors. Fiber-optic bronchoscopy revealed a near-total occlusion at the end of the endotracheal tube by an Ascaris worm. A 22-cm long worm was removed. Finally the child received six additional reconstructive operations, recovered well, and was discharged after a 46-day stay in the hospital.

    Noerdin et al[13]reported a 7-year-old boy with a head injury in a motor vehicle accident. He underwent a craniotomy and was stable for 48 hours. Then his condition progressively deteriorated. The patient showed dyspnea and hypoxemia was worsening despite giving pure oxygen. Manual ventilation was not helpful. Endotracheal tube was changed and no blockage with mucus plug was observed. Flexible bronchoscopy via the endotracheal tube revealed a yellowish tube like object at the lower end of the trachea, sitting on the carina and the ends snuggling into both the right and left main bronchi. The patient was then put under general anaesthesia to remove the foreign body with a rigid bronchoscope. It was identified to be an 8-cm long Ascaris roundworm. After the procedure, his ventilation and oxygenation markedly improved. The boy was eventually discharged home three weeks later.

    Bharati et al[14]described a 28-year-old man, a polytraumatized victim, was presented in the emergency room with signs of respiratory distress. He had a compressed fracture of the dorsal vertebrae (D1-D2), right femur and right tibia and fi bula, and multiple rib fractures with flail segment of the chest and pneumothorax. A bilateral chest tube was inserted into the pneumothorax. The patient was electively intubated in the emergency room and shifted to the ICU for further management. On the second day of his ICU stay, he suddenly became restless and started to be desaturated. It was noticed that the movement of the chest wall was asymmetrical. As the suction catheter was removed from the endotracheal tube, a 15-cm long Ascaris lumbricoides was suctioned out. Later, the conditions of the patient were improved and the patient settled down. He received anti-helminthic treatment and was operated upon for the bone fractures. The rest of his course in the hospital was uneventful.

    Ascaris worm in the intercostal drainage bag

    Mohite et al[15]reported a middle age man with a recent blunt trauma over the left chest, and had a left pneumothorax with a collapsed lung. An emergency intercostal drainage tube was inserted and fixed. Next morning, the left lung was well expanded and there was no air under the diaphragm. In the afternoon, an Ascaris worm was noticed in the intercostal drainage bag along with 50 mL of blood mixed with bile. During the laparotomy, the intercostal drainage tube was found to perforate the left dome of the diaphragm with the tip entering the loop of the jejunum. The chest tube was removed on the second day of operation and the patient made a quick recovery.

    Ascaris pneumonitis

    Lastra et al[16]reported a 25-year-old man, who was injured with loss of consciousness in a motorcycle accident. He had a fracture of the left frontal bone and orbit, a fracture of the anterior cranial fossa and left frontal cerebral contusion. Chest radiography identified alveolar infiltrates in both lung fields, and blood test revealed leukocytosis and eosinophilia. Numerous Ascaris larvae were found in the left bronchus by fiber-bronchoscopy and identified pathologically. Unfortunately, the patient died of brain death caused by severe trauma.

    Heggers et al[17]reported Ascaris infection in three children thermally injured in the same fire. One child without smoke inhalation did not develop Ascaris pneumonitis even with positive stool samples and was discharged with no complications. Whereas the other two children had a complication of smoke inhalation, that induced severe pneumonitis. One of them was placed on extracorporeal membrane oxygenation (ECMO) and did not complete the treatment with vermox. This child died of adult respiratory distress syndrome (ARDS) after several weeks of ECMO treatment. Histological lung sections revealed Ascaris larval infestation. Another child also developed a pneumonitis, but received the full course of treatment with vermox, slowly recovered, and discharged home. The authors concluded that a heavy infestation of Ascaris could further exacerbate the smoke-induced lung injury.

    Complications of ascariasis in the gastrointestinal tract Roundworm in the intestinal lumen

    Podgorny[18]reported a 3-year-old boy who was injured by a pistol shot had a wound in the chest and abdomen. Exploratory laparotomy revealed, in addition to the gunshot penetrating injuries of the lung, liver, stomach, gall bladder and colon, most unexpectedly, amassive Ascaris infection throughout the entire length of the small intestine, one Ascaris worm lodged in the appendix, and another worm was found while examining the perforation of the transverse colon. The two worms were removed and the perforations in the colon were repaired. After the operation the child improved rapidly and eventually was discharged home.

    Pratt and Blachar[19]reported a 17-year-old girl who was involved in a bomb explosion with multiple injuries in the chest, abdomen and pelvis. A CT scan of the abdomen revealed an incidental finding of multiple curvilinear tubular and cylindrical filling defects in the intestinal lumen, suspicious for an intra-luminal intestinal infection with roundworm. It was confirmed at emergency abdominal operation performed for the traumatic intestinal perforation.

    Cabrera and Garcia[20]reported a 26-year-old soldier who was shot in the right upper back abdomen. A surgical diagnosis was made of open abdominal trauma involving the right kidney, ascending colon, and a 2-cm duodenal perforation. After right nephrectomy and hemicolectomy, an adult female Ascaris worm emerged from the small intestinal wound and moved into the surrounding peritoneal cavity. The patient did well after the operation and was later discharged in good condition.

    Roundworm in the intestinal lumen and peritoneal cavity

    Masumbuko and Hawkes[21]reported a 12-yearold girl presented with gunshot wounds on the anterior abdominal wall, involving the left shoulder and the thumb of the left hand. She underwent an urgent exploratory laparotomy. In addition to the surgical treatment of gunshot injuries of many abdominal organs, an unexpected finding was that a total of 22 ascarids (seven had been fragmented by the bullet) were extracted through the traumatic enterorotomy wound and from the peritoneal cavity. Fortunately, the patient recovered well without complication.

    Roundworm in the peritoneal cavity

    Huang et al[22]reported 2 cases of traumatic rupture of the small intestine (the exact nature of trauma was not specified) who underwent intestinal anastomosis. The patients developed acute abdominal colicky pain and rebound tenderness at 5 and 11 days after the operation, respectively, and were suspected of intestinal fistula and peritonitis. In both patients the second laparotomy revealed the rupture of intestinal anastomosis and the presence of several Ascaris worms in the peritoneal cavity. Both patients recovered well after the second operation and were discharged from the hospital.

    Alfonso and Carrigan[23]reported a 45-year-old man admitted to the hospital with a right tibia fracture. Three days later he developed acute in fl ammation of the abdomen. At laparotomy it was discovered that there was a perforation of the ileum with hundreds of Ascaris worms lying freely in the peritoneal cavity. The patient was treated and uneventfully recovered.

    Ascaris in the nasogastric tube

    Perry et al[24]reported a 39-year-old woman who was wounded in a motor vehicle crash. She had multiple bone fractures and tendon injury. The patient received broad spectrum antibiotics, analgesia, and was admitted to the ward. A nasogastric tube was inserted for nausea the following day after admission. Her tendon injuries were repaired operatively. Postoperatively the nasogastric tube was extracted while a large, red, pointed, writhing Ascaris worm was found. The patient was treated with mebendazole and recovered uneventfully.

    Roundworm passing from the mouth

    Scherbenske and Norman[25]reported a 23-year-old man injured by beating. He had a scalp laceration and a left radius and ulna fracture, and an open left metacarpal fracture. The patient was operated upon for the wound of the left forearm. He was anesthetized and an endotracheal tube was inserted orally via direct laryngoscopy. The 5-hour operation was well tolerated by the patient. While being fully awaking, the patient was extubated and given oxygen via a face mask. After moving the patient to a gurney for transportation to the surgical intensive care unit, he regurgitated a 15-cm adult female Ascaris lumbricoides. The infestation was undiagnosed until after extubation. He was treated with mebendazole, recovered well, and was discharged 7 days after admission.

    Margery and Niang[26]reported a 36-year-old man admitted to the emergency room after being hit by a bus. He had an orbital hematoma and rib fractures. During an overnight observation, a female adult Ascaris worm was observed to exit from the mouth. Finally, the patient recovered well and was discharged.

    DISCUSSION

    In this study, we collected 24 cases reported in 21 articles. There were 13 males and 6 females (other 5cases were not specified). The overwhelming majority of the patients were from tropical and subtropical countries. Although ascariasis occurs at all ages, it is most common in children. In this article, 12 of the 24 cases were children. The most frequent causes were traffic accidents in 5 cases, firearm wounds in 5, and burn injuries in 4. There were 3 fatal cases in this group of patients. Ascariasis is one of the 17 neglected tropical diseases in the world,[27]and still constitute a signi fi cant burden in many developing countries. We noticed that 11 cases, almost half of the 24 cases described in 10 articles were reported in the last decade; among them, 8 cases in 8 articles were reported in recent 4 years. These facts highlight the actual signi fi cance of this fi nding.

    It is worth noting that among the 24 cases, Ascaris infestation was diagnosed only in 5 cases before surgery, in 6 cases during abdominal surgery or respiratory intubation, in 2 cases after operation, but postoperatively in 11 cases and 2 cases at autopsy. This indicates that physicians need to pay more attention to the possibility of Ascaris infectin in trauma patients.

    It is also worthy of noting that the dangerous consequence to the patient is not necessarily correlated with the number of infected Ascaris worms. Among the reported cases, massive Ascaris infection in the intestine[18]or in the peritoneal cavity[21,23]was successfully treated. However, the single Ascaris worm obstructing the tracheal tube,[10]endotracheal tube,[11,12,14]larynx[6]or trachea,[8,13]caused sudden life-threatening dyspnea and necessitated immediate intervention. A single roundworm obstructing the endotracheal tube even caused acute respiratory failure and death of a patient.[9]These data demonstrate that the presence of even a single Ascaris worm in the airway tract is extremely dangerous, and physicians should be vigilant on this issue.

    It is understandable that almost all complications of ascariasis in trauma patients so far reported were found in the digestive and airway tracts. It is closely related to the unique life cycle of Ascaris lumbricoides. Ascaris infection is taken place by ingestion of eggs in the fecalcontaminated drinking water and foods. Eggs containing infective larvae hatch in the duodenum. The larvae penetrate the intestinal mucosa and enter the circulatory system, via the venous system to the liver and then to the lung. The larvae molt twice in the lungs, and eventually rupture from the pulmonary capillaries to enter the alveoli. Subsequently they move up to the respiratory tree and trachea to the epiglottis to be coughed up, swallowed, and passed again to the small intestine, where they complete the fi nal molt and develop to sexual maturity.[28]

    Ascaris worms have the ability to probe and force their way into various ectopic locations. Probably they are prone to try to escape unfavorable conditions. Thus, various abnormal conditions such as fever, diseases, surgical operation, drugs, anesthesia, traumatic injuries, spicy foods, fasting, etc., may cause them to migrate to other less hostile regions, fi nally to diverse complications such as intestinal perforation,[22,23,29]volvulus,[30,31,32]intussusceptions,[33]and gangrene.[34]Ascaris may penetrate through the intestinal perforation into the peritoneal cavity and cause acute peritonitis.[21,22,23,35]When larvae migrate through the lungs, they may cause eosinophilic pneumonitis (L?ffler's syndrome).[16,17,36]Ascaris worms in the airway passage can cause sudden obstruction and dyspnea,[8–13,37]or cough with Ascaris worm from the nose or mouth.[26,38,39]Understanding the characteristic behavior of Ascaris worms may be helpful in our diagnosis and treatment.

    Although ascariasis is more prevalent in tropical and subtropical developing countries, physicians should be vigilant of related complications. At the present time, the intensive immigration and freedom of travel between various parts of the world may increase the incidence of this disease.

    The diagnosis of Ascaris infection is usually not difficult. Especially, many powerful diagnostic techniques such as ultrasound, CT, MRI and endoscopy are widely applied at present. However, the most important thing is that physicians should be aware of the possibility of Ascaris infection in a trauma patient. From a practical point of view, a careful collection of previous history of Ascaris infection such as roundworm in vomitus or passing in stools and a routine examination of feces for Ascaris eggs may provide valuable information that is useful to make a correct diagnosis. This test is simple to perform, non-invasive and cheap in cost, and it can be done everywhere, even in a rural ambulance service. Therefore, it is worth taking a routine stool examination in every urgent trauma patient coming from an endemic area of ascariasis. Since a delay in its management may have a fatal outcome, early diagnosis and prompt intervention are essential to minimize the high morbidity and mortality of these life-threatening complications in trauma patients.

    Funding:None.

    Ethical approval:Not needed.

    Con fl icts of interest:There is no con fl ict of interest in this study.

    Contributors:Li QY proposed the study. Zhou CN completeddata collection and wrote the manuscript. All authors contributed to the design and interpretation of the study, and approved the fi nal manuscript.

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    Received November 16, 2013

    Accepted after revision May 20, 2014

    World J Emerg Med 2014;5(3):165–170

    10.5847/ wjem.j.issn.1920–8642.2014.03.001

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