Dental implant placement with immersive technologies: A preliminary clinical report of augmented and mixed reality applications.

A preliminary clinical report of implant placements with 2 immersive reality technologies is described: augmented reality with head mounted display and mixed reality with a tablet PC. Both immersive realities are promising and could facilitate innovative dental applications. However, mixed reality requires further development for clinical optimization.

Biomechanical study on the effect of atherosclerosis on the vulnerability of thoracic aorta, and it's role in the development of traumatic aorta injury.

Traumatic aorta injury (TAI) is the second most common traumatic cause of death preceded only by head injuries, being responsible for 5% to 30% of all mortalities in high-speed deceleration injuries. Multiple external factors might play a role such as impact speed, impact direction, occupant location, and presence or lack of restraining safety mechanism. Apart from these external factors, also human biological factors can influence its development. Based on the data of scientific literature, age clearly plays a role in suffering TAI, but the role of atherosclerosis-as a disease affecting the structure of the aorta-is unknown. Biomechanical properties of tissue samples of 104 aorta specimens removed during the autopsy from the posterior (Group 'A') and lateral wall (Group 'B') of descending aorta were analyzed. Specimens were examined by a Zwick/Roell Z5.0 biaxial tester. The Young's modulus (E (MPa)) was calculated using a linear regression procedure where the base of the elongation was the parallel length of the sample, the achieved maximal force (Fmax (N)), the elongation at the time of Fmax (Lmax (mm)), the force at the beginning of rupture (Fbreak (N)), the elongation at the time of Fbreak (Lbreak (mm)) were registered. Specimens were categorized based on macroscopic and microscopic appearance. In the posterior (A) samples the difference between Lbreak (p<0.001) and Lmax (p<0.001) was significant between the macroscopic group. Lbreak (p = 0.009) and Lmax (p = 0.003) showed similar pattern in the lateral (B) samples. Comparing the histological groups by the measured parameters (Fmax, Lmax, Fbreak, Lbreak) showed a significant difference in the means (p<0.001, p = 0.003, p<0.001 respectively). The study demonstrated that atherosclerosis decreases the resistance of the aorta. The rupture occurs at lower force (Fmax and Fbreak), and at shorter elongation (Lmax and Lbreak) in case of the presence of atherosclerosis. This effect is most substantial if calcification is present: the resistance of aorta affected by calcification is only two-thirds on average compared to aorta affected by the early phase of atherosclerosis. This phenomenon can be clearly explained by the weakening structure of the tunica intima.

Penetrating chest trauma caused by a falling metallic bar: a case report.

Background: Impaling injuries to the chest are relatively rare and often lethal. Initial evaluation, resuscitation, and surgical planning can be challenging for emergency physicians and surgeons. Chest trauma can be classified as either closed or penetrating, depending on whether or not the pleural cavity is open. Penetrating objects entering chest cavity frequently make an entrance and exit and are often accompanied by visceral/vascular damage. Open thoracotomy or video-assisted thoracic surgery (VATS) are considered the first-line approaches for severe penetrating chest trauma. Case Description: A 63-year-old male patient sustained a penetrating chest trauma caused by a T-shaped metallic bar falling from a height of 16 meters above the ground. After laboratory and imaging tests, as well as pre-operative preparation, the object was pulled out from the entry site after disinfection with surgical standby. Closed chest tube drainage was promptly performed, with chest tubes inserted through the entry and exit sites. The patient was discharged on postoperative day 14 in a good condition. Regular telephone follow-ups over 3 years showed that the patient recovered well after discharge. Conclusions: For penetrating non-cardiac chest trauma patients in stable condition, it is necessary to complete an exhaustive imaging evaluation to determine the specific position of the foreign body and identify any injuries to major vessels and organs. If the condition permits, direct removal of foreign bodies is allowed, ideally under VATS control. Surgeons should evaluate the best option for each case based on the available resources.

Piercing the surface: A mechanical analysis of stabbing with household tools.

Estimating the applied power during a stabbing incident, or estimating the minimal force necessary to penetrate the body with a certain weapon is a challenging task in forensic practice. A thorough forensic evaluation of stabbing forces needs objective numerical experimental data. Stabbing tests of 12 different weapons - including knives, a pair of scissors, a fork, screwdrivers, a rasp, a corkscrew, and a utility knife blade - were performed with a Mecmesin MultiTest-dV material tester on pork loin and ballistic gel to estimate the stabbing forces and dynamics. Penetration force (Fp ) and maximal force (Fmax ) were recorded, and the registered force curves were analyzed. Fmax was 159.8-212.07 Newton (N), 30.56-30.58 N, 168.9-185.48 N for various knives; 171.39-190.43 N for the pair of scissors, 233.6 N for the fork; 532.65-562.65 N, 370.31-367.19 N and 314.51-432.89 N for various screwdrivers, 44.14-56.62 N for utility knife during pork loin stabbing. The butter knife, corkscrew and rasp were not able to penetrate the pork loin, and the curved fork bent during stabbing. The results prove that weapon characteristics greatly influence the force necessary for penetration. Maximal stabbing force depends mostly on tip sharpness, and the force sharply decreases after penetration occurs, which indicates that edge sharpness is not as important as tip characteristics during stabbing perpendicular to skin surface. The penetration force during stabbing with a pair of scissors is comparable to the penetration force of knives. Stabbing with screwdrivers generally needs larger force than average knives but depends greatly on screwdriver size.

Development and validation of a pulmonary complications prediction model based on the Yang's index.

Background: Blunt chest trauma patients with pulmonary contusion are susceptible to pulmonary complications, and severe cases may develop respiratory failure. Some studies have suggested the extent of pulmonary contusion to be the main predictor of pulmonary complications. However, no simple and effective method to assess the severity of pulmonary contusion has been available yet. A reliable prognostic prediction model would facilitate the identification of high-risk patients, so that early intervention can be given to reduce pulmonary complications; however, no suitable model based on such an assumption has been available yet. Methods: In this study, a new method for assessing lung contusion by the product of the three dimensions of the lung window on the computed tomography (CT) image was proposed. We conducted a retrospective study on patients with both thoracic trauma and pulmonary contusion admitted to 8 trauma centers in China from January 2014 to June 2020. Using patients from 2 centers with a large number of patients as the training set and patients from the other 6 centers as the validation set, a prediction model for pulmonary complications was established with Yang's index and rib fractures, etc., being the predictors. The pulmonary complications included pulmonary infection and respiratory failure. Results: This study included 515 patients, among whom 188 developed pulmonary complications, including 92 with respiratory failure. Risk factors contributing to pulmonary complications were identified, and a scoring system and prediction model were constructed. Using the training set, models for adverse outcomes and severe adverse outcomes were developed, and area under the curve (AUC) of 0.852 and 0.788 were achieved in the validation set. In the model performance for predicting pulmonary complications, the positive predictive value of the model is 0.938, the sensitivity of the model is 0.563 and the specificity of the model is 0.958. Conclusions: The generated indicator, called Yang's index, was proven to be an easy-to-use method for the evaluation of pulmonary contusion severity. The prediction model based on Yang's index could facilitate early identification of patients at risk of pulmonary complications, yet the effectiveness of the model remains to be validated and its performance remains to be improved in further studies with larger sample sizes.

Misconnected chest tube: An extremely unusual fatal complication of secondary pneumothorax.

A rare and fatal complication of suction drainage of secondary spontaneous pneumothorax is reported. The patient, likely by a mistake, arbitrarily connected the oxygen supply tube to the thoracic drain. The sharp increase of intrapleural pressure combined with the atmospheric intraalveolar environment caused diffuse lung injury and cardiopulmonary collapse without a direct lung injury. The conflicting interests of patient autonomy and patient safety require further consideration.

To Feed or Not to Feed - Nutritional Risk Assessment and Support in Elective Colorectal Surgery. A Prospective Study on the Effect of Screening.

Colorectal cancer (CRC) is the third most common malignant tumor and resection remains the key element in its treatment. The correction of preoperative malnutrition reduces morbidity and mortality. Our study demonstrates a nutritional state mass screening protocol to steer nutritional support. Two hundred fifty-nine patients with planned colorectal resection were prospectively enrolled. Preoperative telemedicinal assessment determined the risk of malnutrition using Nutritional Risk Screening 2002 (NRS 2002) score. Patients with a score ≥3 were offered optimized oral nutritional supplement. Three groups were investigated. Group I (NRS 2002 < 3, n = 98) received no supplement. Group II- (NRS 2002 ≥ 3, n = 118) was offered but did not finally receive clinical nutrition. Group II+ (NRS 2002 ≥ 3, n = 43) accepted and received adequate clinical nutrition. 98 patients (37.8%) had no risk, 154 patients (59.5%) had increased risk and 7 (2.7%) had severe malnutrition. Severe complications (Clavien-Dindo >2) rate was similar in Group I (2%) and Group II+ (2.3%) with no mortality. Severe complications more often occurred in Group II- (5.1%) along with 1.7% mortality (p > 0.05). Length of stay was the highest in Group II- while the lowest in Group II+ (p < 0.01). Preoperative telemedicinal screening is applicable in identifying patients with malnutrition. NRS 2002 used by a nutritional team reduces length of stay.

COVID-19 mortality is associated with low vitamin D levels in patients with risk factors and/or advanced age.

BACKGROUND & AIMS: Although conclusive evidence is yet lacking, it has been suggested that vitamin D deficiency (VD) may be associated with a more severe course of SARS-CoV-2 Infection (COVID-19). In this retrospective study we assessed the association of VD deficiency with mortality in a group of COVID-19 patients treated in a tertiary referral center. METHODS: Data of 257 Covid-19 patients hospitalized between 30th September 2020 and 2nd March 2021 have been collected retrospectively. The following parameters were collected: age, gender, serum level of 25-OH-Vitamin D3, outcome (survival/death), comorbidities (cancer, diabetes mellitus and chronic obstructive pulmonary disease). Serum VD measurement was done within 3 days of admission. RESULTS: VD levels were significantly lower in patients who did not survive, however, in this patients' group the average age was significantly higher than among those, who survived. After age-matching, in a subgroup of patients with risk factors and/or 60 years of age or older who survived had significantly higher VD level in their serum than those who deceased. Serum C-reactive protein, lactate-dehydrogenase and creatinin-kinase were significantly higher in the group in which the patients died, however these laboratory parameters did not correlate with the VD levels. CONCLUSION: We found that in COVID-19 infection, when old age as risk factor (60 years of age or older) was pooled with risk factors (cancer, diabetes and/or COPD), the VD levels were significantly lower in the patient group, in which the patients did not survive. We suggest further, prospective studies in similar subgroups to explore a possible causal relationship.

Pneumothorax/pneumomediastinum and pre-existing lung pathology in ventilated COVID-19 patients: a cohort study.

Background: There is an increasing number of reports on developing pneumothorax/pneumomediastinum among severe acute respiratory syndrome coronavirus disease 2019 (SARS-COVID-19) patients. The aim of our study was whether pre-existing diffuse lung pathology increases visceral pleural vulnerability resulting in pneumomediastinum and pneumothorax among mechanically ventilated COVID-19 patients? Methods: A total of 138 consecutive COVID-19 patients admitted to the Intensive Care Unit of Petz Aladár University Teaching Hospital between 1st March 2020 and 1st February 2021 were included. Sixty/138 (43.48%) patients had one or more computer tomography scans of the chest. Analysis was focused on the image defined lung conditions during artificial ventilation. Results: Thirteen out of 60 ventilated patients developed pneumothorax or pneumomediastinum proven by computer tomography (9.42%). Three/13 patients suffered from pre-existing lung parenchyma pathology, while 10/13 had only COVID-19 infection-related image abnormality. Forty-three/60 patient had healthy lung pre-COVID. Kruskal-Wallis test, Spearman correlation and Cox regression calculations did not reveal any statistically significant result proving increased vulnerability during pressure support therapy and visceral pleural breakdown in patients with pre-existing lung pathologies. Conclusions: Pre-existing lung pathology does not increase the risk of onset of pneumothorax or pneumomediastinum in comparation with previously healthy lungs of ventilated COVID-19 patients.

Narrative review of theoretical considerations regarding HITHOC between past and future.

Hyppocrates constructed the medicines-surgery-energy triangle which includes all therapeutical modalities. Hyperthermic intraoperative chemotherapy (HITHOC) is a synergy-based single stage multimodality treatment encompassing the locoregional manifestation of the systemic malignant process. Pleural space, thermal effect, lavage/irrigation and chemotherapy represent the basic science ports of the network hub: HITHOC. The malignant transformation and process of the pleural surface (and underlying lung) challenges space management and tissue control. Thermotherapy without local chemotherapy is insufficient, similar to the normothermic local irrigation aligned with anticancer agents. The local administration of combined heat-transfer fluid and chemotherapy with or without subsequent surgical removal offers reasonable outcome in extensive primary pleural neoplasms (malignant mesothelioma), advanced (> Stage IIIA) NSCLC, functionally inoperable lung cancer and pleural carcinosis from extrathoracic malignancies. Measured by symptom-free survival and the quality of life, HITHOC in its present form, offers a modest yet fully substantiated solution. HITHOC in combination with the local application of targeted therapy and/or immunotherapy administered in the pleural space are currently under investigation. Additional development including new acting substances, their solvents and the means regarding surgical delivery and anesthesiology techniques are sign posts up ahead. Level 2 evidence are required in order to stepping up the recommendation levels, rewriting protocols and guidelines, in which HITHOC earns its revered position in the decision making process it deserves.

Surgical Staplers: The History of Conception and Adoption.

The paper explores not well-known aspects of the development of surgical staplers. It is based on the review of the selected literature. It covers the novel idea of using metal staples that was successfully executed in 1908 by the Hungarian surgeon Hültl, and acknowledges contribution of Soviet specialists to the development of the mechanical suturing devices for many thoracic, abdominal, and vascular procedures. The paper also reflects on an almost detective story of how Ravitch, an American surgeon visiting the USSR in 1957, managed to bring to the United States a Russian stapler, which became a prototype for modern devices.

The DNA damage repair-related gene PKMYT1 is a potential biomarker in various malignancies.

BACKGROUND: Protein kinase membrane associated tyrosine/threonine 1 (PKMYT1) regulates cell cycle and is a part of DNA damage repair (DDR)-related signaling. Recent studies have identified a role for PKMYT1 in tumor immunity and DDR. Thus, we initiated this study aiming to characterize the molecular and immunological portrait of PKMYT1 in cancer. METHODS: Transcriptomic data extrapolated from Genotype-Tissue Expression (GTEx), The Cancer Genome Atlas (TCGA), and Cancer Cell Line Encyclopedia (CCLE) datasets were used to determine the mRNA expression levels of PKMYT1. PKMYT1 mRNA expression status was correlated with patients' prognosis as well as immune neoantigens, and immune checkpoints in 34 different tumors. The Tumor Immune Estimation Resource (TIMER) dataset was used to analyze immune infiltrating scores. RESULTS: PKMYT1 mRNA is differentially expressed in common tumors and high expression levels of PKMYT1 mRNA is associated with poor prognosis except for malignant thymoma (THYM). In addition, PKMYT1 mRNA expression was correlated with tumor-infiltrating immune cells particularly in lung squamous cell carcinoma, esophageal carcinoma, THYM, and lung adenocarcinoma. An upregulation of immune checkpoints and neoantigens was observed in tumors with a high PKMYT1 mRNA expression. Data from gene set enrichment analysis (GSEA) revealed that PKMYT1 is involved in tumor immunogenicity, metabolism, and cell cycle progression. CONCLUSIONS: PKMYT1 is differentially expressed in various cancers and exerts an important effect on tumor immunity and progression. The PKMYT1 gene holds the potential as a new potential biomarker. Therefore, further studies are clearly needed to elaborate our findings.

The effect of hepatic steatosis and fibrosis on liver weight and dimensions.

The liver is the most commonly injured abdominal organ, accounting for around half of abdominal organ injuries. The emergence of liver injury is determined by the injury mechanism, force, and tissue vulnerability. The vulnerability of the liver depends on the strength of the capsule and parenchyma, as well as the weight and dimensions of the liver. The common hepatic diseases, like steatosis, fibrosis, and cirrhosis, can change the organ weight and dimensions, but their exact correlation is not well known. This study was designed to evaluate the correlation between liver diseases, weight, and dimensions. The liver weight, horizontal, vertical, and antero-posterior length were measured obtained by 213 forensic autopsies. The recorded data were compared with body height, age, and liver histology. Body height positively correlated with liver weight (R2 = 0.252), but the correlation was much stronger in the case of livers without structural disease (R2 = 0.450). The liver size seems to significantly decrease with age (R2 = 0.081), but the effect is mostly due to structural alterations that are proven by histology. The comparison of the liver weight in various histological groups clearly indicated that steatosis increases the liver size, but fibrosis does not (if no steatosis is present at the same time). In general, liver dimensions increase proportionally to the liver weight. However, hepatic steatosis causes disproportional enlargement: it does not have a significant effect on the horizontal dimension and has only a minor effect on the vertical dimension. Steatosis affects disproportionally the dimensions with a strange tendency to expand liver anteroposteriorly.

The effect of steatosis and fibrosis on blunt force vulnerability of the liver.

The aim of our study was to examine the possible effect of steatosis and fibrosis on the blunt force vulnerability of human liver tissue. 3.5 × 3.5 × 2-cm-sized liver tissue blocks were removed from 135 cadavers. All specimens underwent microscopical analysis. The tissue samples were put into a test stand, and a metal rod with a square-shaped head was pushed against the capsular surface. The force (Pmax) causing liver rupture was measured and registered with a Mecmesin AFG-500 force gauge. Six groups were formed according to the histological appearance of the liver tissue: intact (group 1), mild steatosis (group 2), moderate steatosis (group 3), severe steatosis (group 4), fibrosis (group 5), and cirrhosis (group 6). The average Pmax value was 34.1 N in intact liver samples (range from 18.1 to 60.8 N, SD ± 8.7), 45.1 N in mild steatosis (range from 24.2 to 79.8 N SD ± 12.6), 55.4 N in moderate steatosis (range from 28.9 to 92.5 N, SD ± 16.0), 57.6 N in severe steatosis (range from 39.8 to 71.5 N, SD ± 11.9), 63.7 N in fibrosis (range from 37.8 to 112.2 N, SD ± 19.5), and 87.1 N in the case of definite cirrhosis (range from 52.7 to 162.7 N, 30.3). The Pmax values were significantly higher in samples with visible structural change than in intact liver sample (p = 0.023, 0.001, 0.009, 0.0001, 0.0001 between group 1 and groups 2 to 6 respectively). Significant difference was found between mild steatosis (group 2) and cirrhosis (group 6) (p = 0.0001), but the difference between mild, moderate, and severe steatosis (groups 2, 3, and 4) was not significant. Our study demonstrated that contrary to what is expected as received wisdom dictates, the diseases of the parenchyma (steatosis and presence of fibrosis) positively correlate with the blunt force resistance of the liver tissue.

Pulmonary contusion.

Lung contusion resulting from chest trauma may be present various clinical pictures. It quite often remains unrecognized and is only suspected later when severe complications have developed. Lung contusion may present in association with chest trauma but may also occur alone. It has to be emphasized, that lung contusion as a clinical identity does not necessarily require a blunt or penetrating chest to be in the background. Nowadays, as a result of traffic accidents, following high energy deceleration, lung contusion may present without an actual tissue damage in the chest wall as a condition initiating an independent, life-threatening generalised process. Although lung contusion shows similarities to blast injury of the lung with respect to clinical consequences, other factors play a role in its aetiology and pathology. Its description and recognition as an independent pathology is not simple. Several approaches exist: thoracic trauma, pulmonary contusion, pulmonary laceration, lung contusion; although these may show similar clinical signs, manifest in different pathologies. Pathologies with similar meaning and possibly similar clinical course cannot, actually, be differentiated; they may accompany other injuries to the trunk, skull or extremities, which, alone, are associated with high morbidity and mortality. Generally, it can be declared that besides high energy, blunt injuries affecting the trunk, lung contusion, has been an often neglected additional radiological finding attached to the main report, despite the fact, that its late consequences crucially determine the prospects of the injured.