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At least 163 records · Page 9Linked to original sources

Permeability of pure enantiomers of ketorolac through human cadaver skin.

The permeability of pure enantiomers of ketorolac acid, a potent non-narcotic analgesic, through human cadaver skin was evaluated. The melting temperature of each enantiomer was 20 degrees C higher than that of the racemic compound. As expected, the solubility of the racemic compound in water and isopropyl alcohol/water/isopropyl myristate (IPA/water/IPM, 50:50:1.5) was roughly 2 times higher than that of the enantiomers. The permeability of the enantiomers through poly(ethylenevinyl acetate) (EVA) synthetic membrane and human cadaver skin was determined with a side-by-side diffusion cell. The skin flux of the racemic compound was about 1.5 times higher than those of the enantiomers. On the other hand, no significant differences in the intrinsic permeability coefficient of the racemic compound and the enantiomers in the EVA membrane and human cadaver skin was observed. An excellent agreement between the predicted and experimental flux ratio of the racemic compound and enantiomer in the EVA membrane and cadaver skin was observed. The IPA/water/IPM (50:50:1.5) provided the highest in vitro skin flux of the S enantiomer among the three vehicle formulations studied. The skin flux of the active pure S enantiomer was ca. 34% higher than that of the impure S enantiomer in the racemic mixture. Furthermore, about 14% intersubject variability in the in vitro skin flux of the S enantiomer was observed. The required skin flux of the S enantiomer as calculated from the pharmacokinetic parameters was about 32 micrograms/cm2/h from a 25 cm2 transdermal patch, which was readily achievable from the IPA/water/IPM (50:50:1.5) ternary vehicle system.

Anti-Inflammatory Agents, Non-Steroidal↗

Cytokinetics of epidermic cells in skin from human cadavers. I. Dependency on the postmortal interval.

Punch biopsies taken from the extensor side of the thigh of 35 human cadavers were incubated in vitro with radioactively labeled thymidine (3H-thymidine = 3H-TdR, 14C-thymidine = 14C-TdR) to determine whether a relationship exists between changes in the proliferative activity of the skin and the postmortal interval after irreversible cardiac arrest. The cadavers were stored at 4 degrees C. Cadavers with indeterminable time of death or presence of intoxication, drug therapy with cytostatic agents, or a skin disease were excluded from the study. Single, double, or multiple biopsies were performed on the same cadaver; single labeling with 3H-TdR was done in all cases; double labeling with 3H-TdR and 14C-TdR in selected cases. No relevant changes in the labeling index (mean, 2.39 +/- 1.03%) were demonstrable within the examined postmortal interval of 77.75 h. The DNA synthesis time (ts) was, on the average, 4.75 +/- 1.44 h; a certain relationship to the postmortal interval existed since ts declined with increasing storage time. The potential doubling time (tpot) decreased accordingly, beginning with 181.7 h (mean storage time, 29.9 h) and ending with 137.7 h (mean storage time, 41.7 h). No statistically relevant differences, however, were established at the 1% level. Whereas both labeling index and tpot during the early postmortal interval are comparable with observations in live humans, ts was relatively short as compared to that for the epidermis of live humans.

Adolescent↗

Cytokinetics of epidermic cells in skin from human cadavers. II. Dependency on sex, age, and site.

Kinetic data on the labeling index (LI), DNA synthesis time (ts), and potential doubling time (tpot) of epidermic cells in relation to sex, age, and site were obtained by in vitro incubation of skin cylinders from 45 human cadavers with DNA precursors 3H- and 14C-thymidine. In a first study on parts of the same material, it was established that LI over a period of more than 70 h and tpot over a period of at least 30 h remained essentially unchanged and are comparable with live humans, when the cadavers were stored at 4 degrees C. The following results were obtained: The female and male cadavers had a LI of 2.6% (+/- 0.8%) or 2.5% (+/- 0.8%), a ts of 3.9 h (+/- 0.2 h) or 5.0 h (+/- 1.6 h), and a tpot of 168.5 h (+/- 34.3 h) or 183.9 h (+/- 27.2 h). The LI for the thigh and knee ranged between 21.3% and 25.8% in different age groups. No statistically relevant differences were established between the sexes or among the age groups. Topographic allocation of the proliferative-kinetic data ultimately showed that, on the average, LI was relatively high at the elbow (3.1% +/- 1.0%) with short tpot (109.3 +/- 72.5 h) and a comparatively large epidermal diameter (47.1 microns); by contrast, LI at the lower abdomen was impressively low (2.1% +/- 0.8%), tpot relatively long (183.0 +/- 138.7 h) and mean epidermal diameter relatively small (23.0 microns). Nevertheless, no statistically relevant differences were established between data for elbow and lower abdomen or between other data for different sites. The proliferative-kinetic data for human cadavers were compared with data reported in the literature for live humans.

Adolescent↗

Degenerative change and rotator cuff tears. An anatomical study in 160 shoulders of 80 cadavers.

In order to determine the effects of friction and rubbing in the development of rotator cuff tear, we studied 160 shoulders of 80 cadavers (age at death 43-93 years, mean 69.3 years). Seventy-two cadavers were fixed with formalin and eight were fresh cadavers. The surface of the cuff and the undersurface of the acromion were observed macroscopically. Eight shoulders of fresh cadavers were examined by scanning electron microscopy. Ninety-eight specimens (61%) showed degenerative changes of the supraspinatus tendon. The number of tendons with degeneration and tear increased from the fifth to sixth decade of life, and the size of the tear increased with age. However, there was no sustained increase in the incidence with aging from the age of 60 to 90 years, and the percentage with degenerative changes of the cuff remained at approximately 60% in each decade. Ninety-six specimens (60%) showed degeneration of the subacromial surface. The percentage with degeneration of the undersurface of the acromion remained at approximately 60% from the sixth to ninth decade. There was a significant correlation between the severity of the changes in the rotator cuff and the subacromial surface. Scanning electron microscopy showed changes suggesting effects of friction and rubbing on the rotator cuff, such as regularly arranged wool-like spherical structures on the surface of the tendon and rounded ruptured ends of the tendon fibers. These results indicate that degenerative change of the rotator cuff is aggravated by a friction and rubbing mechanism with the undersurface of the acromion and leads to development of a complete tear.

Acromion↗

A dynamic cadaver model of the stance phase of gait: performance characteristics and kinetic validation.

OBJECTIVE: This study was undertaken to evaluate the performance of a new dynamic laboratory model of the stance phase of gait. DESIGN: Five cadaver feet were repetitively tested in the apparatus. BACKGROUND: Typical biomechanical investigations of cadaver feet simply place a static load on the tibia. The present system was designed to better simulate the changing in-vivo loading environment of the foot and ankle during gait. METHODS: The device mimics the behavior of the tibia, foot, and ankle from heel-strike to toe-off by reproducing the physiologic actions of five extrinsic foot muscles and physiologic motion at the proximal tibia. To verify its utility, cadaver gait simulations were conducted while measuring applied muscle forces, ground reaction forces, and plantar pressures. RESULTS: Dynamic muscle forces were consistently delivered to within 10% of pre-programmed values. Dynamic measurements of ground reaction forces and plantar pressure were similar to those measured in healthy human subjects. Peak vertical (y), foreaft (x) and medio-lateral (z) forces were 110, 18, and 4% of body weight respectively. Compressive force in the tibial shaft reached 410% of body weight. RELEVANCE: Cadaver studies have greatly enhanced our understanding of normal and pathologic foot function, but are often limited by over-simplified loading conditions. The apparatus presented here accurately reproduces the in-vivo loading environment and provides a powerful investigational tool for the study of foot and ankle function. With this device, musculoskeletal structures can be examined in detail under biomechanical conditions similar to those they experience in life.

Journal Article↗

Frontal sinus anatomical variations with potential consequences for the orbit. Study on cadavers.

Anatomical variations of the frontal sinuses that may play a role in the correlation between frontal sinusitis and orbital complications are described. There were used 18 cadavers during routine educational cadaver dissections, one month after theirs withdrawal from the formol basin. The dissections of the cranial cavity and the orbits were performed so as to reveal the frontal sinuses. An unusual bilateral posterior extension of the frontal sinus mucosa was found in two of the cadavers. The projection of the mucosa was covering half of the orbital roof in a 60 year old male and one third of the orbital roof in a 59 year old male. Among the other cadavers that presented normal variations of the frontal sinuses, there was also a case of a 57 year old female with a complete aplasia of the frontal sinuses. Such anatomical variations with unusual extension of the frontal sinuses above orbital roof may support the correlation between frontal sinusitis and the possible complications from the orbit and these cases may be considered as 'high risk' cases for orbital complications during a frontal sinusitis.

Female↗

A cadaver study to measure the adult glottis and subglottis: defining a problem associated with the use of double-lumen tubes.

OBJECTIVE: To test the hypothesis that the adult cricoid diameter is the same or less than that of the glottis. DESIGN: Prospective. SETTING: A city mortuary. PARTICIPANTS: Adult cadavers undergoing autopsy. INTERVENTIONS: After removal of the organs, the trachea was opened above the first ring to allow access to the cricoid from below, and the cricothyroid membrane was cut so that passage of measuring sounds through the vocal cords from above could be confirmed. MEASUREMENTS AND MAIN RESULTS: In 79 male and 55 female cadavers, the largest of a graduated series of cylindrical sounds that the cricoid ring would accommodate was noted. Then the biggest size possible that could pass through the glottis was measured. Height and weight were recorded. In 68% of males and 76% of females, glottic diameter was greater than subglottic; in all other cases, it was the same. In none was it smaller. Correlation between height and cricoid diameter was 0.24 for male cadavers and 0.21 for female cadavers. Regression analysis showed females to average a cricoid diameter 3.5 mm less than males of the same height. CONCLUSIONS: The ruling diameter of the adult larynx is not the glottis but the cricoid ring. Its correlation with height is extremely poor, and it averages 3.5 mm less in females than males of the same height. These findings are important for thoracic anesthesiologists.

Adult↗

Endoscopic neck dissection in human cadavers.

OBJECTIVE: To evaluate the feasibility and efficacy of endoscopic neck dissection (END) in human cadavers. STUDY DESIGN: Experimental self-controlled study. METHODS: END on five human cadavers through three openings: one for the camera, one for the dissecting instrument, and one for a grasping one. The tissue specimens removed were divided into traditional neck groups (I to V). After the completion of END, open neck dissection was performed using standard surgical techniques and the remaining tissue within each neck group was retrieved. The important neck structures (carotid artery, internal jugular vein, cranial nerves X, XI, and XII, phrenic nerve) were evaluated for lesions. A pathologist evaluated each specimen, without knowing its exact origin in terms of neck group or side, and type of surgical technique used. For each specimen, the number of retrieved lymph nodes and their anatomic integrity was analyzed. RESULTS: Ten neck dissections were performed on 5 cadavers, without any major difficulty. An injury of the internal jugular vein occurred twice and once the phrenic nerve was cut. Little tissue was usually left for open surgical dissection. The average number of retrieved lymph nodes by endoscopy was 4.9 +/- 2.7 (mean +/- standard deviation). Completion open neck dissection retrieved an additional 0.5 +/- 0.5 lymph nodes. Efficacy of END was 92 +/- 10%. The majority of retrieved lymph nodes were intact but exhibited important postmortem autolysis artifacts. CONCLUSIONS: Endoscopic neck dissection is possible in human cadavers and is free of lesions to major structures. The majority of neck lymph nodes can be removed endoscopically.

Aged↗

Proteinuria in "normal" cadaver kidney donors.

BACKGROUND: More information is needed about cadaver organ donor pathophysiology. METHODS: We quantitated preprocurement, timed urine protein excretion in 23 "normal" cadaver kidney donors, and correlated results with urine protein dipstick readings and multiple other parameters. We also attempted to measure microalbuminia in 10 subjects. RESULTS: Seventeen of 23 cadaver donors did not have detectable proteinuria (albuminuria) by urine dipstick testing but had 1,704+/-2,900 mg (mean+/-SD) of quantitated daily urine protein, which did not correlate with creatinine clearance or urine volume. Donors with head trauma had numerically more quantitated proteinuria (3,000+/-5,160 vs. 970+/-670 mg/day, P=0.13). Microalbumin varied from 3 to 34% of the total urine protein concentration. CONCLUSIONS: Significant proteinuria as measured by quantitative collection techniques is often present in excellent cadaver kidney donors and is not detected by dipstick testing. It may be a marker of important terminal pathophysiologic events and deserves further study.

Albuminuria↗

Influence of serum amylase and plasma glucose levels in pancreas cadaver donors on graft function in recipients.

In a series of 101 pancreas transplants from brain cadaver donors, serum amylase levels were determined preoperatively in 47 donors, and plasma glucose levels were monitored in 94 donors. Eighty-six percent of the donors died from head injury and 14% from asphyxia. No donors had a history of diabetes or pancreatitis, and the pancreas was grossly normal in all donors. Of the 47 cadaver pancreas donors in whom serum amylase levels were measured, the values of 20 donors were elevated (110-994 IU/L), and the values of 11 donors were greater than 300 IU/L. In 51 of 94 braindead cadaver pancreas donors in whom plasma glucose determinations were made, hyperglycemia was present (200-980 mg/dl). Early posttransplant pancreas-graft function was excellent in all recipients except for 5 patients in whom the grafts had to be removed for reasons not related to donor serum amylase and plasma glucose levels. Hyperamylasemia and hyperglycemia are probably not contraindications for cadaver pancreas organ donation unless overt pancreatic trauma, pancreatitis, or a history of diabetes is present.

Amylases↗

Transmission of white spot syndrome virus (WSSV) to Litopenaeus vannamei from infected cephalothorax, abdomen, or whole shrimp cadaver.

Shrimp viruses can remain infectious in frozen shrimp tissue and have been found in frozen commodity shrimp. Therefore, the threat of viral outbreaks in wild and cultured shrimp via frozen commodity shrimp exists. Because frozen shrimp are imported with and without the cephalothorax, more knowledge is needed concerning the infectivity of a cephalothorax relative to that of an abdomen. We compared the mortality rates from shrimp exposed to a WSSV-infected cephalothorax, abdomen, or whole shrimp cadaver. Estimates of transmission coefficients from the exposures to the infected cephalothorax, abdomen, or whole shrimp were also calculated because the transmission coefficients account for differences in the initial doses. In addition, we compared the variability in infectivity of pieces of shrimp by feeding 24 equal-sized pieces of cephalothorax and abdomen to 24 individually isolated shrimp. In Expt 1, susceptible shrimp did not completely consume the infected abdomen, and a significant difference was detected among shrimp exposed to the abdomen (mortality rate = 0.40), cephalothorax (mortality rate = 0.75), and whole shrimp cadaver (mortality rate = 0.67). The calculated transmission coefficients were 0.95 from an infected cephalothorax, 0.59 from an infected abdomen, and 0.69 from an infected whole shrimp cadaver. In Expt 2, susceptible shrimp were starved to ensure complete ingestion of each dose. No significant difference was observed in the estimated mortality rates from an infected cephalothorax (0.58), abdomen (0.63), or whole shrimp (0.67). The calculated transmission coefficients were 0.84 from an infected cephalothorax, 0.83 from an infected abdomen, and 0.60 from an infected whole shrimp cadaver. In Expt 3, no difference was observed in the mortality rates resulting from exposures to pieces of infected cephalothorax (0.57) or abdomen (0.58). Our results suggested that there was no difference in the viral loads of a WSSV-infected cephalothorax or abdomen, but that the cephalothorax was more infectious, probably because it was more palatable. In addition, our results are inconsistent with some assumptions of pathogen transmission used in epidemiological models. Some shrimp may be less aggressive feeders; therefore, susceptible shrimp are differentially contacting the dead infected shrimp in the exposure tanks, violating the random mixing assumption. Moreover, virus is probably not homogeneously distributed throughout an infected shrimp, suggesting that contacts between susceptible and infected shrimp are not equally likely to result in transmission.

Animals↗

Prediction and analysis of human thoracic impact responses and injuries in cadaver impacts using a full human body finite element model.

Human thoracic dynamic responses and injuries associated with frontal impact, side impact, and belt loading were investigated and predicted using a complete human body finite element model for an average adult male. The human body model was developed to study the impact biomechanics of a vehicular occupant. Its geometry was based on the Visible Human Project (National Library of Medicine) and the topographies from human body anatomical texts. The data was then scaled to an average adult male according to available biomechanical data from the literature. The model includes details of the head, neck, ribcage, abdomen, thoracic and lumbar spine, internal organs of the chest and abdomen, pelvis, and the upper and lower extremities. The present study is focused on the dynamic response and injuries of the thorax. The model was validated at various impact speeds by comparing predicted responses with available experimental cadaver data in frontal and side pendulum impacts, as well as belt loading. Model responses were compared with similar individual cadaver tests instead of using cadaver corridors because the large differences between the upper and lower bounds of the corridors may confound the model validation. The validated model was then used to study thorax dynamic responses and injuries in various simulated impact conditions. Parameters that could induce injuries such as force, deflection, and stress were computed from model simulations and were compared with previously proposed thoracic injury criteria to assess injury potential for the thorax. It has been shown that the model exhibited speed sensitive impact characteristics, and the compressibility of the internal organs significantly influenced the overall impact response in the simulated impact conditions. This study demonstrates that the development of a validated FE human body model could be useful for injury assessment in various cadaveric impacts reported in the literature. Internal organ injuries, which are difficult to detect in experimental studies with human cadavers, can be more easily identified with a validated finite element model through stress-strain analysis, especially in conjunction with experimental studies.

Journal Article↗

The effect of day of emergence from the insect cadaver on the behavior and environmental tolerances of infective juveniles of the entomopathogenic nematode Heterorhabditis megidis (strain UK211).

Infective juveniles (IJs) of entomopathogenic nematodes (EPNs) are obligate parasites of insect larvae. Inside the host they develop into sexually mature adult stages and complete their life cycle. Two or 3 adult nematode generations can occur in the insect host. The increase in nematode population density in the insect cadaver, together with limiting nutrient conditions, result in the formation of IJs. These IJs emerge into the soil to search for a new host. It typically takes 7-8 days for all IJs to emerge from a parasitized insect. We have investigated the effect of the day of emergence of IJs from insect cadavers on the environmental tolerance and behavior of the EPN Heterorhabditis megidis strain UK211. The IJs that emerge early display good initial host-finding ability and increased temperature tolerance but disperse poorly and have poor tolerance to desiccation. Conversely, the IJs that emerge later display poor initial host-finding ability and poor temperature tolerance but they disperse well and possess increased desiccation tolerance. These phenotypic differences are likely to facilitate early-emerging IJs in locating and infecting hosts in the vicinity of the cadaver, whereas IJs that emerge late are adapted to disperse away from their natal cadaver. We hypothesize that adaptive phenotypic plasticity rather than allelic variability may provide the genetic basis for the different physiological and behavioral phenotypes of the early- and late-emerging IJs.

Animals↗

A contact lens as an artificial cornea for improved visualization during practice surgery on cadaver eyes.

OBJECTIVE: To describe the use of a polymethylmethacrylate contact lens as an artificial cornea to enhance visualization for practice surgery using cadaver eyes. DESIGN: The opaque cornea of a cadaver eye is removed by trephination. Cyanoacrylate glue is used to secure a large-diameter polymethylmethacrylate contact lens to the corneal rim. RESULTS: Excellent visualization for practice surgery is achieved with this technique. The adhesion of the contact lens to the cadaver eye maintains the anterior chamber sufficiently to perform phacoemulsification cataract extraction or pars plana vitrectomy. CONCLUSIONS: This technique improves visualization of the intraocular structures during practice surgery, thereby enhancing the ability of the learning surgeon to perform and practice delicate surgical maneuvers. The procedure is simple, effective, and inexpensive.

Cadaver↗

The zygomatic-sphenoid fracture line in malar reduction. A cadaver study.

OBJECTIVE: To demonstrate the persistent malar displacement and distraction of the zygomatic-sphenoid fracture line that is possible after alignment of the frontozygomatic and infraorbital rim fractures of a displaced malar fracture. DESIGN: Nonblinded cadaver study. SUBJECTS: Three fresh cadaver heads and 1 representative clinical example. INTERVENTION: The cadaver heads were subjected to blunt trauma to the malar eminence. Reduction of the malar unit was performed either with attention to the frontozygomatic and infraorbital rim fractures alone or with concomitant inspection of the zygomatic-sphenoid fracture line. The representative case was repaired with a trans-conjunctival approach for inspection of the zygomatic-sphenoid fracture line. RESULTS: Persistent malar asymmetry is possible after the reduction of displaced malar fractures when only the frontozygomatic and infraorbital rim buttresses are used for reference. In each case in our study, the zygomatic-sphenoid fracture line remained distracted. Alignment of the zygomatic-sphenoid fracture restored premorbid malar position. CONCLUSION: Inspection of the zygomatic-sphenoid fracture line can contribute significantly to the precise 3-dimensional reduction of displaced malar fractures.

Adult↗

Anxiety and dissection of the human cadaver: an unsolvable relationship?

Anxiety is an emotional reaction frequently shown by students when a human cadaver is being dissected. Nonetheless, few studies analyze the nature of the anxiety response in this situation and the ones that do exist are mainly limited to English-speaking countries. Our research has three aims: to study the characteristic anxiety reaction to dissection practices, to determine the weight exerted by internal and environmental variables on this anxiety reaction, and to design practices aimed at reducing the state of anxiety experienced by pupils in their human anatomy practices. The studies were carried out in the dissection room of the Department of Human Anatomy and Embryology II at the Faculty of Medicine of the Complutense University, Madrid, during the 3 academic years 2000-2003. The anxiety response to the first dissection of a human cadaver is mainly determined by a situation considered to be threatening, with novelty as its main characteristic. The students' anxiety response is first determined by the situation itself and reactions depend on individual differences. Repeated or gradual exposure (detailed verbal information on the situation, visits to dissecting rooms when no cadaver is present, videos showing pictures of human dissections, etc.) before carrying out the first dissection reduce the students' anxiety response.

Anatomy↗

Recovery of periodontopathogenic bacteria from embalmed human cadavers.

There is recent interest in recovery of periodontopathogenic bacteria from arterial and bronchial tissues to identify a link between periodontal and cardiovascular or pulmonary diseases. This interest could provide a useful clinical correlation exercise for gross anatomy. Our objective was to perform a feasibility study to determine whether these bacteria could be recovered from two sites within eight (4 dentate, 4 edentulous) human embalmed cadavers from an anatomical dissection laboratory. Bacterial samples were collected from the right coronary artery and the right superior secondary bronchus and assayed for the presence and concentrations of the DNA of A. actinomycetemcomitans, E. corrodens, C. rectus, P. intermedia, P. gingivalis, B. forsythus, T. denticola, and F. nucleatum. Frequencies were compared using a Kruskal-Wallis H-test. Correlations between the presence of teeth, bacterial species, and site were determined by a Spearman's rho correlation test. A. actinomycetemcomitans and B. forsythus frequencies were different between the sites in edentulous subjects (P <0.05); the frequency of B. forsythus was different in dentate and edentulous subjects at the bronchus site (P <0.05). Numerous significant correlations were identified between strains of bacteria, site, and presence of teeth. Thus, it is possible for the DNA of periodontopathogenic bacteria to be recovered from human embalmed cadavers. Collection and identification of these bacteria from these cadavers could be a useful clinical correlation exercise for dental students in a gross anatomy class.

Aged↗

High incidence of the os peroneum in a cadaver sample in Johannesburg, South Africa: possible clinical implications?

This study set out to investigate the incidence of the os peroneum in a cadaver sample from Johannesburg, South Africa and to note how bio-demographic parameters affect such incidence. The os peroneum (OP) is a sesamoid bone frequently found in the tendon of the fibularis longus muscle (FLM), as it passes on the plantar aspect of the cuboid bone. While this bone is often an incidental dissection room or radiological finding, OP fractures, with or without associated rupture of the fibularis (peroneus) longus tendons have been reported. Some investigators have also suggested that the presence of the OP may render the tendon of the FLM susceptible to avulsion injuries. The reported incidences of the OP range between 8 and 26%. These data have emanated by and large from radiographic rather than dissection studies, and the influences of biological indices such as age, sex, population group of origin, and side of the body on these incidences remain largely unknown. Forty cadavers (average age = 75 years) were dissected. Os peronei were present in 36 of these cadavers (90.0%), with 96% of them occurring bilaterally. This bilateral incidence was statistically significant (P = 0.007), but there was no significant difference in age (P = 0.38), sex (P = 0.97), or population group (P = 0.17). We hope that the unusually high incidence of the OP reported here will stimulate further research into possible predisposing factors as well as into the speculated associations between sesamoid occurrence, osteoarthritis, and tendon injuries.

Adult↗