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At least 19 recordsLinked to original sources
PubMed1993

[Treatment of invasive thymoma using low dose and extended-field irradiation including hemi-thorax or whole-thorax].

The records of 10 patients treated for invasive thymoma with low-dose and extended-field irradiation including hemi-thorax or whole-thorax are reviewed. Six patients were in stage III. They were treated with up to 15 Gy hemi-thorax irradiation which was followed by shrinkage of the radiation field after removal of tumor. Five of them have lived 4 to 10 years, while one remaining patient died of uncertain cause. Four patients had stage IVa thymoma. Two patients in an earlier stage were treated with irradiation alone; whole-thorax irradiation of up to 20 Gy followed by local irradiation. Those two patients, however, developed severe pulmonary infection secondary to irradiation pneumonitis. Furthermore, local relapse was observed in one patient who died of respiratory insufficiency after 6 years. In the remaining 2 patients in stage IVa, intensive chemotherapy was administered before whole-thorax irradiation of up to 15 Gy. One of these patients is alive with no evidence of recurrence for 5 years, while the other died of a disease not related to thymoma. These facts indicate that whole-thorax irradiation combined with chemotherapy may be of value in preventing local relapse with stage IVa thymoma.

Adult↗
PubMed1980

[Longitudinal data of physical growth of healthy children. IV. Shoulder breadth, thorax breadth, thorax depth, hand breadth, 2 pelvic and epicondylic breadths of children aged 2.5 to 15 years (author's transl)].

From 1968--1978 a longitudinal study was performed concerning development of shoulder and thorax breadths, thorax depth, breadths of hand, pelvis, humeral and femoral epicondylus in 709 boys and 711 girls aged 2.5 to 15 years. During time studied mean increases in boys amounted in shoulder breadth to 15.1 cm, in thorax breadth to 9.8 cm, in thorax depth to 6.6 cm, in hand breadth to 3.1 cm, in breadths of pelvis I to 10.9 cm, of pelvis II to 8.5 cm, in breadth of humeral epicondylus 2.5 cm and of femoral epicondylus 3.5 cm. The corresponding data in girls amounted to 14.0 cm, 8.0 cm 4.8 cm, 2.5 cm, 11.0 cm, 8.0 cm, 2.0 cm and 2.9 cm. The parameter measured developed both in boys and girls almost linearly until year 12. Beginning with year 13, development of breadths increased in boys are remained unchanged in girls. Development of breadth in boys was always increased compared with girls except pelvic breadth I.

Adolescent↗
PubMed1991

Comparison of inhalation-to-perfusion ratio in anesthetized dogs with barrel-shaped thorax vs dogs with deep thorax.

Interregional, as well as intraregional (local), distributions of the inhalation-to-perfusion ratio were analyzed in the lungs of 20 prone anesthetized healthy dogs--10 dogs with barrel-shaped thorax (Beagles) and 10 dogs with deep thorax (Greyhound-type dogs)--using 99mTc inhalation-perfusion lung scintigraphy. Dorsoventral and lateral views were analyzed. In both types of dogs, the ratio between the mean inhalation and perfusion values (interregional mismatching factor gamma) decreased from craniad to caudad and the decrease was more sustained in the right than in the left lung. However, the total decrease was less in Greyhound-type dogs than in Beagles (cranial-to-caudal decrease of 14 and 27%, respectively, in the left lung, and 62 and 56%, respectively, in the right lung). The dorsal-to-ventral distribution of gamma was different in the 2 types of dogs. In Beagles, it increased from dorsal to ventral zones by about 50% of the initial dorsal zone value, whereas in Greyhound-type dogs, only a slight dorsal-to-ventral decrease was evident, with the exception of the more ventral zone. Differences in the intraregional mismatching factor (rho) indicated that the intraregional inhalation-to-perfusion inequalities were more pronounced within the caudal regions and within the ventral zones of the lungs in both types of dogs, and in the more cranial zones in the lungs of Beagles. However, the degree of intraregional mismatching was generally lower in Greyhound-type dogs. Thus, the gravitational force is not the dominating determinant of interregional or intraregional inhalation-to-perfusion ratio distributions in the lungs of anesthetized prone dogs.(ABSTRACT TRUNCATED AT 250 WORDS)

Aerosols↗
PubMed1988

Growth of lung and thorax dimensions during the pubertal growth spurt.

In the follow-up study of adolescents residual volume (RV), vital capacity (VC), closing volume (CV), thorax height and thorax width were measured at six month intervals over a six year period; 149 girls and 477 boys, whose ages ranged between 11.5 and 18.5 yr during the follow-up, were investigated. In healthy subjects and in those with respiratory symptoms the rates of change of thoracic dimensions, as calculated by a robust linear regression technique, were moderately well correlated; the growth rates of RV and VC were only slightly correlated, and both were moderately well correlated with changes in thorax dimensions. Thorax height increased relative to thorax width in boys and girls during the follow-up. In boys, thorax height continued to grow, when standing height and thorax width had attained adult values in girls. Thus the thorax attains a more elongated shape. During the adolescent growth spurt the residual volume as a percentage of total lung capacity (RV%TLC) within subjects increased on average 0.6% per yr, and closing volume as a percentage of vital capacity (CV%VC) decreased on average 0.5% per yr. Both of these changes can be accounted for by decreased thorax compliance and increased outward chest recoil at low lung volumes.

Adolescent↗
PubMedDate not supplied

Thorax deformity and asthma bronchial.

In patients with bronchial asthma thorax deformity aggravates the respiratory function. The authors performed follow up examinations on 381 young adults who suffered from bronchial asthma in childhood. Thorax deformities were was found in 70 patients (28 pectus excavatum, 8 pectus carinatum, 19 thorax emphysematicus . 15 other and combined deformities). Comparing the recovered and non-recovered asthmatic patients, the state of the ill one was significantly worse with regards to thorax deformity. In the seriously ill patients thorax deformities occurred significantly more frequently than in the total number of patients. In the thorax deformity group asthma had an earlier onset and lasted longer in comparison with the whole of patients studied. Bronchial hyperreactivity and lung function values referring to chronic obstruction were significantly more frequent in patients with thorax deformity. Investigating physical exercise, the ratio of patients pursuing some sporting activity was similar, i.e. 50%, both in the total patient group and in the group of patients with pectus excavatum and pectus carinatum, while 90% of the patients belonging to the thorax emphysematicus group did not pursue any physical training.

Adolescent↗
PubMed2002

Pelvis-thorax coordination in the transverse plane during walking in persons with nonspecific low back pain.

STUDY DESIGN: Transverse pelvis and thorax rotations were studied during walking in 39 patients with nonspecific low back pain and 19 healthy participants. OBJECTIVES: To gain insight into the consequences of low back pain for gait and to identify clinically useful measures for characterizing the quality of walking in patients with low back pain. SUMMARY OF BACKGROUND DATA: Gait studies in patients with low back pain have reported a decrease in walking velocity. In normal gait, in-phase pelvis-thorax coordination (synchronicity) evolves toward antiphase coordination (counterrotation) as walking velocity increases. This study examined the effect of walking velocity on pelvis and thorax rotations in patients with low back pain. METHODS: Amplitudes of pelvis and thorax rotations were calculated, and spectral analyses were performed. Pelvis-thorax coordination was characterized in terms of relative Fourier phase, and coupling strength was assessed by means of cross-spectral analysis. RESULTS: In comparison with healthy participants, relative Fourier phase was significantly smaller in low back pain patients for walking velocities of 3.8 km/h and higher, whereas coupling strength was significantly higher for velocities from 1.4 to 3.0 km/h. No significant group differences were found in amplitude or spectral content of individual pelvis and thorax rotations. CONCLUSION: In comparison with healthy participants, the gait of patients with low back pain was characterized by a more rigid, less flexible pelvis-thorax coordination in the absence of significant differences in the kinematics of the component rotations. This result suggests that coordination measures are more adequate in assessing quality of walking in patients with low back pain than are kinematic measures pertaining to the individual segment rotations, and that conservative therapy should use methods aimed at improving intersegmental coordination.

Adult↗
PubMed1994

Unilateral hyperlucent thorax on plain chest radiographs after neck dissection: importance of atrophy of the trapezius muscle.

OBJECTIVE: A hyperlucent thorax on plain chest radiography indicates a decrease in the radiographic density of the thorax, which can be caused by intra- or extrapulmonary diseases. The purpose of this study was to assess the prevalence and mechanisms that may be responsible for unilateral hyperlucency of the thorax after neck dissection and to determine if atrophy of the trapezius due to the transection of the accessory nerve is a cause of hyperlucent thorax. MATERIALS AND METHODS: Differences in the radiographic density between the right and left lung were evaluated and correlated with transection of the accessory nerve in 21 patients who had had a radical or a modified neck dissection for a malignant tumor of the head and neck. Twenty-eight neck dissections were performed on these 21 patients (seven had a simultaneous bilateral neck dissection). In 14 of the 21 patients, the accessory nerve had been severed during the neck surgery. In six patients, mechanisms responsible for a hyperlucent thorax were investigated with follow-up thoracic CT scans. RESULTS: In the radiographs, eight patients had a hyperlucent thorax on the side of the neck dissection. In all of these cases, the accessory nerve on the side of this neck dissection had been severed during a radical or a modified neck dissection. Prior to surgery, no such hyperlucency was noted. CT scans showed atrophy of the denervated trapezius muscle. CONCLUSION: Our findings show that atrophy of the denervated trapezius muscle after neck dissection is a cause of unilateral hyperlucent thorax on plain chest radiographs. Therefore, this finding should be anticipated as a postoperative change in patients who have had this surgery.

Accessory Nerve↗
PubMed1979

Dynamic characteristics of the thorax connected with the heart action.

We determined the indices of local vibrations (resonance frequency, damping coefficient, stiffness constant, extinction time) and transfer function H(s) . 10(-6) for three somatotypes and three respiratory positions on 88 points of the thorax. The examinees were males (age 21 years). We found the resonance frequencies of 36.86--54.75 cps, damping coefficient (delta) 0.121--0.217. This means the damping is less than critical (delta = 1). We applied shocks (a force of 2 N) with a reflex hammer on 88 points of the thorax. The force diminished from the exciting place (say ictus) to the recording place (accelerometer on the sternum) from 2 to 0.2 N. The athletic type has the highest resonance frequency and stiffness constant; the leptosomic type has the highest damping; the longest extinction time belongs to the pyknic type. The pyknic type has also the highest value of the transfer function. The respiratory position (quiet respiration, Valsalva and Müller experiment) influences the values of the indices of local vibrations and of the transfer function. The influence is evident especially on the intercostal points: the transfer of the oscillations is alleviated at a higher stiffness of the thorax (Valsalva; the value of H(S) . 10(-6) rises from 7.00 to 9.39 sec2), it deteriorates at a small stiffness of the thorax (in Müller's experiment falls to 2.78 sec2). With the fall in the intrathoracic pressure the damping in the intercostal points decreases. On the basis of experiments the conclusion was made that a short testing of the thorax of an examinee will give the dynamic characteristics of the thorax (indices of local vibrations and transfer functions) of the individual. This procedure will alleviate the quantitative use of noninvasive mechanical methods in the assessment of the cardiovascular function.

Adult↗
PubMed1999

Thorax closure in Drosophila: involvement of Fos and the JNK pathway.

Dorsal closure, a morphogenetic movement during Drosophila embryogenesis, is controlled by the Drosophila JNK pathway, D-Fos and the phosphatase Puckered (Puc). To identify principles of epithelial closure processes, we studied another cell sheet movement that we term thorax closure, the joining of the parts of the wing imaginal discs which give rise to the adult thorax during metamorphosis. In thorax closure a special row of margin cells express puc and accumulate prominent actin fibres during midline attachment. Genetic data indicate a requirement of D-Fos and the JNK pathway for thorax closure, and a negative regulatory role of Puc. Furthermore, puc expression co-localises with elevated levels of D-Fos, is reduced in a JNK or D-Fos loss-of-function background and is ectopically induced after JNK activation. This suggests that Puc acts downstream of the JNK pathway and D-Fos to mediate a negative feed-back loop. Therefore, the molecular circuitry required for thorax closure is very similar to the one directing dorsal closure in the embryo, even though the tissues are not related. This finding supports the hypothesis that the mechanism controlling dorsal closure has been co-opted for thorax closure in the evolution of insect metamorphosis and may represent a more widely used functional module for tissue closure in other species as well.

Animals↗
PubMed1978

Finite element dynamic structural model of the human thorax for chest impact response and injury studies.

The component model modal synthesis technique has been successfully adapted to the finite element structural dynamic model of the human thorax for chest impact response and injury studies. The complete thorax was modeled as an assembly of a thorax module with viscera subsystems. The module was further subdivided into rib components. Major model development was conducted at the component level to provide cost saving and modeling flexibility. The results show that the thorax can be successfully treated as a linear system. A two-step procedure was developed to obtain viscera response. The analysis results of THORAX III, a first cut thorax model, were favorably compared with Kroell-Nahum cadaver experiments. The sensitivity of the chest response due to variation in input pulse shape and peak force were analyzed. The pulse shape can affect the force-deflection relationships while peak force affects the peak response. Further sensitivity studies and experiments are proposed.

Biomechanical Phenomena↗
PubMed2002

Pelvis-thorax coordination in the transverse plane during gait.

The coordination between horizontal pelvic and thoracic rotations during treadmill walking was studied in ten subjects. Previous studies have considered the relative phase using the mean to characterize coordination mode, and the S.D. as an index of its stability. However, to use S.D. of relative phase as a measure for coordinative stability, the underlying oscillations have to be phase-locked at a certain value. Random fluctuations around this value can then be viewed as stochastic perturbations of a stable fixed point, resulting in a unimodal distribution of relative phase. Using methods of circular statistics this study shows that these conditions were not met in pelvis-thorax coordination. Spectral analyses revealed that, as walking velocity increased, a triphasic component emerged in the pelvic rotations, while the thoracic rotations remained harmonic across all walking velocities. These findings refute the use of standard relative phase measures to capture pelvis-thorax coordination. An alternative measure is introduced, namely the difference between the continuous Fourier phases of the component oscillations as determined for the main frequency of the thorax oscillation. With this measure, pelvis-thorax coordination was found to evolve from in-phase coordination towards antiphase coordination as walking velocity increased. This method may be used to assess reliably the properties of pelvis-thorax coordination in both healthy and pathological gait patterns in the future.

Adult↗
PubMed1995

Chemical guidance of Onchocerca lienalis microfilariae to the thorax of Simulium vittatum.

The behavioural responses of Onchocerca lienalis microfilariae (mf) to tissue factors of the surrogate black fly host, Simulium vittatum, were studied using a novel in vitro bioassay. Mf accumulated towards thoracic tissues to a density 4 times higher than towards abdominal tissues, despite the larger surface area and volume of abdominal tissues. Mf migrated toward thoracic tissues regardless of whether or not contact with thoracic tissues was possible. Therefore, mf directed themselves toward the thorax rather than arresting their movement after they make contact with thoracic tissues. Chemical cue(s) provided a principal guidance for mf to locate thoracic tissues. Mf lost their ability to differentiate thoracic and abdominal tissues following addition of thoracic attractant(s) to excised abdomens and reversed their differential response when excised thoraces were depleted of chemical cue(s). Mf did not respond to salivary gland product, but to other thoracic factor(s). Intact thorax that was connected to 1-2 abdominal segments attracted considerably less mf than excised thorax. However, intact thorax attracted more mf than excised abdomen. Abdominal tissue size did not affect thorax attractiveness. Involvement of a large molecular weight protein(s) was suggested by the high attractiveness of the 100 kDa Centricon concentrator retentate and complete precipitation of attractant(s) by ethanol.

Animals↗
PubMed1994

Gene-environment interaction for body size and larval density in Drosophila melanogaster: an investigation of effects on development time, thorax length and adult sex ratio.

We measured the effect of larval density on thorax length, development time, sex ratio and a measure of total fitness, using strains of Drosophila melanogaster artificially selected for increased thorax length, control lines otherwise cultured in an identical way, and the base stock from which the lines had been derived. We used the addition experimental design (Mather & Caligari, 1981). No genotype-environment interaction was observed when comparing the reduction in thorax length of 'large' and 'control' lines with increasing larval density for any culture series, i.e. rank ordering of genotypes and additive genetic variances remained the same in all the environments tested. In contrast, the reduction in thorax length for the base stock as density increased was proportionally smaller than that of the 'large' and 'control' lines. Development time increased more rapidly with larval density in the 'large' lines than in the 'controls' or base stock. Sex ratio was unaffected by larval density but thorax length and the development time of females were more affected than those of males by increasing larval density. The estimate of total fitness showed clear evidence of gene-environment interaction for the effect of body size on fitness, with genetically large individuals at an increasing disadvantage with increasing larval density.

Animals↗
PubMed1975

Properties of a free and a solubilized form of bound alpha,alpha-trehalase purified from honey bee thorax.

The free and bound forms of alpha,alpha-trehalase (EC 3.2.1.28) of the honey bee thorax were separated and the bound enzyme was solubilized by raising the pH to 8.0 for 10 h. Both enzymes were purified. They were homogeneous as determined by several electrophoretic criteria. It was found that the two enzymes had very similar Km's (each about 0.89 mM), Vm's (53.2 and 54.3 U/mg for free and solubilized, respectively), inhibition characteristics, specificities (both only hydrolyzed alpha,alpha-trehalose), pH maxima (each had maxima at about 3.5 and 6.5), molecular weights (65,000), isoelectric points (5.1), reactivities to sulfhydryl reagents, electrophoretic mobilities, activation energies (about 12.8 kcal/mol), and similar stabilities to heat, pH, and urea. Some significant differences between the two enzymes were, however, found: the solubilized alpha,alpha-trehalase floated at 70% saturation of ammonium sulfate while the free alpha,alpha-trehalase did not; the solubilized alpha,alpha-trehalase did not dissociate into subunits as readily as did the free one; and the solubilized alpha,alpha-trehalase was found to bind more readily to a hydrophobic grouping than the free enzyme. In addition to these comparisons, three new findings relating to thorax alpha,alpha-trehalases are reported. (1) Thorax alpha,alpha-trehalases are strongly inhibited by beta-glucosides (Ki values of about 8 x 10(-4) M); (2) under certain conditions thorax alpha,alpha-trehalases from honey bees dissociated into subunits of one-half the normal molecular weight; (3) honey bee thorax alpha,alpha-trehalases have unusual biphasic pH activity profiles.

Animals↗