Hemopneumothorax detection through the process of artificial evolution - a feasibility study.

BACKGROUND: Tension pneumothorax is one of the leading causes of preventable death on the battlefield. Current prehospital diagnosis relies on a subjective clinical impression complemented by a manual thoracic and respiratory examination. These techniques are not fully applicable in field conditions and on the battlefield, where situational and environmental factors may impair clinical capabilities. We aimed to assemble a device able to sample, analyze, and classify the unique acoustic signatures of pneumothorax and hemothorax. METHODS: Acoustic data was obtained with simultaneous use of two sensitive digital stethoscopes from the chest wall of an ex-vivo porcine model. Twelve second samples of acoustic data were obtained from the in-house assembled digital stethoscope system during mechanical ventilation. The thoracic cavity was injected with increasing volumes of 200, 400, 600, 800, and 1000 ml of air or saline to simulate pneumothorax and hemothorax, respectively. The data was analyzed using a multi-objective genetic algorithm that was used to develop an optimal mathematical detector through the process of artificial evolution, a cutting-edge approach in the artificial intelligence discipline. RESULTS: The in-house assembled dual digital stethoscope system and developed genetic algorithm achieved an accuracy, sensitivity and specificity ranging from 64 to 100%, 63 to 100%, and 63 to 100%, respectively, in classifying acoustic signal as associated with pneumothorax or hemothorax at fluid injection levels of 400 ml or more, and regardless of background noise. CONCLUSIONS: We present a novel, objective device for rapid diagnosis of potentially lethal thoracic injuries. With further optimization, such a device could provide real-time detection and monitoring of pneumothorax and hemothorax in battlefield conditions.

Traumatic haemopneumothorax and 'whole-body' subcutaneous emphysema: successful use of a small-bore chest drain.

A 56-year-old man presented having had two falls at home. He had a background of multiple sclerosis. After his second fall, during which he had fallen onto the toilet injuring his right chest, he was brought into the emergency department reporting pleuritic chest discomfort. Immediately evident was extensive swelling from his forehead to his thighs, which on palpation was found to be subcutaneous emphysema. A chest X-ray showed a large right-sided pneumothorax for which a chest drain was inserted. A CT revealed extensive surgical emphysema, pneumomediastinum, pneumoperitoneum and gas within the spinal canal. It also showed right-sided rib fractures and associated haemothorax. He was managed conservatively with a 12-French (F), small-bore, chest drain and made a complete recovery without complication. This case challenges the widely held, but poorly evidenced, opinion that traumatic haemopneumothorax needs to be managed with a large-bore surgical chest drain.

Spontaneous hemopneumothorax: our experience with surgical management.

BACKGROUND: Spontaneous hemopneumothorax is rare, accounting for only 1%-12% of patients presenting with spontaneous pneumothorax. The optimal management of these patients remains controversial with no definitive guidelines on patient selection and timing of surgery. The aim of this study was to review our institution's surgical experience in the management of patients with spontaneous hemopneumothorax. METHODS: We performed a retrospective review of all patients with spontaneous hemopneumothorax who underwent surgery from January 2000 to June 2013. Patient data were obtained from our institution's primary spontaneous pneumothorax database. RESULTS: Of 510 patients who underwent surgery for spontaneous pneumothorax, 33 (6.4%) developed spontaneous hemopneumothorax. The mean age was 24.0 years (range 16-40 years). In 30 (90.9%) patients, it was their first presentation of pneumothorax. There were 25 (75.8%) patients with Vanderschueren stage III spontaneous pneumothorax. Blood loss ranged from 250 to 3000 mL (mean 1280 mL). In 28 patients, a torn adhesion band was the source of bleeding. Thoracotomy was the surgical approach in 9 (27.3%) patients, and video-assisted thoracic surgery was used in 24 (72.7%). One patient required reoperation for retained clots. There was no mortality. CONCLUSION: Our results suggest that surgical management of spontaneous hemopneumothorax can be undertaken with minimal morbidity and mortality. With the increasing use of video-assisted thoracic surgery, definitive surgical management of spontaneous hemopneumothorax can be instituted earlier.

[A rare complication after Velpeau bandage: hemopneumothorax]. / Velpeau bandaji sonrasi nadir bir komplikasyon: Hemopnömotoraks.

Velpeau bandage is a treatment method that fixes the arm to the body in cases of fractures and dislocations at the region of shoulder. Velpeau bandage very rarely leads to complications. This case report involves a 45-year-old male admitted to the emergency service after trauma. Glenoid and multiple rib fractures were detected in radiological examinations. A transient Velpeau bandage was performed before surgical correction. Patient had dyspnea and chest pain 24 hours after bandage application. An obvious displacement at the rib fracture sites and hemopneumothorax were seen in the chest X-ray. A chest tube was inserted into the patient. Glenoid fracture was corrected surgically. Patient was discharged on the sixth day. He has no problems at readmission after the first month.

Intramural hematoma of the pulmonary artery and hemopneumomediastinum after endobronchial ultrasound-guided transbronchial needle aspiration.

Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a safe and effective technique for the sampling of mediastinal and hilar adenopathies. We describe the first reported case of pulmonary artery intramural hematoma after EBUS-TBNA puncture of this artery. The complication was visualized by ultrasound and resolved spontaneously.

Long-term pulmonary function after recovery from pulmonary contusion due to blunt chest trauma.

BACKGROUND: Blunt chest trauma can cause severe acute pulmonary dysfunction due to hemo/pneumothorax, rib fractures and lung contusion. OBJECTIVES: To study the long-term effects on lung function tests after patients' recovery from severe chest trauma. METHODS: We investigated the outcome and lung function tests in 13 patients with severe blunt chest trauma and lung contusion. RESULTS: The study group comprised 9 men and 4 women with an average age of 44.6 +/- 13 years (median 45 years). Ten had been injured in motor vehicle accidents and 3 had fallen from a height. In addition to lung contusion most of them had fractures of more than three ribs and hemo/pneumothorax. Ten patients were treated with chest drains. Mean intensive care unit stay was 11 days (range 0-90) and mechanical ventilation 19 (0-60) days. Ten patients had other concomitant injuries. Mean forced expiratory volume in the first second was 81.2 +/- 15.3%, mean forced vital capacity was 85 +/- 13%, residual volume was 143 +/- 33.4%, total lung capacity was 101 +/- 14% and carbon monoxide diffusion capacity 87 +/- 24. Post-exercise oxygen saturation was normal in all patients (97 +/- 1.5%), and mean oxygen consumption max/kg was 18 +/- 4.3 ml/kg/min (60.2 +/- 15%). FEV1 was significantly lower among smokers (71.1 +/- 12.2 vs. 89.2 +/- 13.6%, P = 0.017). There was a non-significant tendency towards lower FEV1 among patients who underwent mechanical ventilation. CONCLUSIONS: Late after severe trauma involving lung contusion, substantial recovery was demonstrated with improved pulmonary function tests. These results encourage maximal intensive care in these patients. Further larger studies are required to investigate different factors affecting prognosis.

Imaging pathologic pulmonary air and fluid accumulation by functional and absolute EIT.

The increasing use of EIT in clinical research on severely ill lung patients requires a clarification of the influence of pathologic impedance distributions on the validity of the resulting tomograms. Significant accumulation of low-conducting air (e.g. pneumothorax or emphysema) or well-conducting liquid (e.g. haematothorax or atelectases) may conflict with treating the imaging problem as purely linear. First, we investigated the influence of stepwise inflation and deflation by up to 300 ml of air and 300 ml of Ringer solution into the pleural space of five pigs on the resulting tomograms during ventilation at constant tidal volume. Series of EIT images representing relative impedance changes were generated on the basis of a modified Sheffield back projection algorithm and ventilation distribution was displayed as functional (f-EIT) tomograms. In addition, a modified simultaneous iterative reconstruction technique (SIRT) was applied to quantify the resistivity distribution on an absolute level scaled in Omega m (a-EIT). Second, we applied these two EIT techniques on four intensive care patients with inhomogeneous air and fluid distribution and compared the EIT results to computed tomography (CT) and to a reference set of intrathoracic resistivity data of 20 healthy volunteers calculated by SIRT. The results of the animal model show that f-EIT based on back projection is not disturbed by the artificial pneumo- or haematothorax. Application of SIRT allows reliable discrimination and detection of the location and amplitude of pneumo- or haematothorax. These results were supported by the good agreement between the electrical impedance tomograms and CT scans on patients and by the significant differences of regional resistivity data between patients and healthy volunteers.

Spontaneous hemopneumothorax revisited: clinical approach and systemic review of the literature.

BACKGROUND: Spontaneous hemopneumothorax, defined as the accumulation of more than 400 mL of blood in the pleural cavity in association with spontaneous pneumothorax, is a rare entity occurring in young patients and may be life threatening. Although many reports of case studies and series have been published in the world literature, the lack of consistent intraoperative findings and varying surgical methods require a review study. METHODS: We discuss the clinical features, management, surgical findings, and outcomes of our own patients with spontaneous hemopneumothorax. RESULTS: From September 1997 to September 2003, 488 patients with spontaneous pneumothorax were treated at our hospital. Of these patients, 27 (5.5%) had spontaneous hemopneumothorax develop. These 27 patients were comprised of 25 men and 2 women ranging in age from 15 to 39 years (mean age, 22.3 years). The amount of blood that was drained ranged from 400 to 1,700 mL (mean, 1,012 mL). Twenty-one patients underwent video-assisted thoracoscopic surgery within 1 day after admission; the remaining 6 patients were treated conservatively with tube thoracostomy alone. On arrival at our emergency room, 9 patients (33.3%) experienced hemodynamic instability with hypovolemic shock. In a review of 6,396 patients with spontaneous pneumothorax in the literature and in our current study, 201 patients (3.1%) had spontaneous hemopneumothorax develop. One hundred seventy-six patients (87.6%) were treated surgically, whereas video-assisted thoracoscopic surgery has been performed in 48.9% of patients (86 of 176). There was no recurrence of hemopneumothorax in any of the 201 patients with spontaneous hemopneumothorax after treatment during the follow-up period. CONCLUSIONS: Thus one-third of the patients with spontaneous hemopneumothorax had shock symptoms develop. Video-assisted thoracoscopic surgery may be considered as an initial treatment procedure for patients with spontaneous hemopneumothorax, whereas conservative treatment is effective and may be performed in selected patients.

Indicators of haemothorax in patients with spontaneous pneumothorax.

OBJECTIVES: To identify indicators and possible risk factors of haemothorax in patients with spontaneous pneumothorax. METHODS: All patients presenting to the emergency department of Chi-Mei Foundation Medical Center, Tainan, Taiwan with primary spontaneous pneumothorax between 1 January 1997 and 31 December 2002 were screened for inclusion in the present study. Of the 211 patients who qualified, eight had spontaneous haemopneumothorax (SHP) (3.79%). The clinical data and demographic characteristics of these patients were similar to those of patients with spontaneous pneumothorax without haemothorax (SP). RESULTS: All eight SHP patients were thin and young men (mean age 24 years and mean weight 56.1 kg). Seven were smokers. The patients with SHP were taller that the patients with SP (177.4 cm v 170.3 cm, respectively; p < 0.01), and tended to have a lower body mass index (BMI) (17.9 kg/m2 v 19.6 kg/m2, respectively; p = 0.06) and higher heart rate (101.0 v 88.0 beats/min, respectively; p = 0.09). Clinically, patients with SHP were more likely to have dyspnoea compared with SP patients (62.5% v 26.6%, respectively; p = 0.04) and lower levels of haemoglobin (12.8 v 14.7 g/dl, respectively; p = 0.01) and haematocrit (38.1% v 44.1%, respectively; p < 0.01). Chest x rays revealed pleural effusion in all patients with SHP but in none with SP. CONCLUSIONS: Patients with SHP are taller, with lower levels of haemoglobin and haematocrit, and are more likely to have dyspnoea than patients without haemothorax. The chest x ray finding of pneumothorax with an ipsilateral air-fluid level is a strong indicator of SHP.

Use of presumptive antibiotics following tube thoracostomy for traumatic hemopneumothorax in the prevention of empyema and pneumonia--a multi-center trial.

OBJECTIVE: To determine whether presumptive antibiotics reduce the risk of empyema or pneumonia following tube thoracostomy for traumatic hemopneumothorax. METHODS: A prospective, randomized, double-blind trial was performed comparing the use of cefazolin for duration of tube thoracostomy placement (Group A) versus 24 hours (Group B) versus placebo (Group C). RESULTS: A total of 224 patients received 229 tube thoracostomies. Logistic regression analysis revealed that duration of tube placement and thoracic acute injury score were predictive of empyema (p <0.05). Empyema tended to occur more frequently in patients with penetrating injuries (p=0.09). chi analysis showed pneumonia occurred significantly more frequently in blunt than penetrating injuries (p <0.05). Presumptive antibiotic use did not significantly effect the incidence of empyema or pneumonia, although no empyemas occurred in Group A. CONCLUSIONS: The incidence of empyema was low and the use of presumptive antibiotics did not appear to reduce the risk of empyema or pneumonia.

Emergency treatment of life-threatening spontaneous haematopneumothorax.

We report two cases of spontaneous life-threatening haemopneumothorax, successfully treated by early thoracotomy. In the first patient no source of bleeding could be identified. The second patient presented bleeding from a torn vascular adhesion at the apex of the lung. The first patient benefited from early clot evacuation and in the second patient the bleeding could be controlled by electrocautery and a single suture of the bleeding vessel. These cases stress the need for early recognition and management of a potentially life-threatening event.