Application of aerobic kenaf granules for biological nutrient removal in a full-scale continuous flow activated sludge system

Aerobic granular sludge (AGS) is a biofilm technology that offers more treatment capacity in comparison to activated sludge. The integration of AGS into existing continuous-flow activated sludge systems is of great interest as process intensification can be achieved without the use of plastic-based biofilm carriers. Such integration should allow good separation of granules/flocs and ideally with minor retrofitting, making it an ongoing challenge. This study utilized an all-organic media carrier made of porous kenaf plant stalks with high surface areas to facilitate biofilm attachment and granule development. A 5-stage Bardenpho plant was upgraded with the addition of kenaf media and a rotary drum screen to retain the larger particles from the secondary clarifier underflow whereas flocs were selectively wasted. Startup took 5 months with a sludge volume index (SVI) reduction from >200 to 50 mL g^-1. Most of the kenaf granules fell in the size range of 600-1400 μm and had a clear biofilm layer. The wet biomass density, SVI₃₀, and SVI₃₀/SVI₅ of the kenaf granules were 1035 g L^-1, 30.6 mL g^-1, and 1.0, respectively, which met the standards of aerobic granules. Improved stability of biological phosphorus removal performance enabled a 25% reduction in sodium aluminate usage. Microbial activities of kenaf granules were compared with aerobic granules, showing comparable N and P removal rates and presence of ammonium-oxidizing bacteria and polyphosphate-accumulating organisms in the outer 50-60 μm layer of the granule. This work is the first viable example for integrating fully organic biofilm particles in existing continuous-flow systems.

The classic: The iliac apophysis: an invaluable sign in the management of scoliosis. 1958

This biographical sketch of Joseph C. Risser Sr. corresponds to the historic text, The Classic: The Iliac Apophysis: An Invaluable Sign in the Management of Scoliosis, available at DOI 10.1007/s11999-009-1096-z.

BDNF, relative preference, and reward circuitry responses to emotional communication

Brain derived neurotrophic factor (BDNF) regulates neural development and synaptic transmission. We have tested the hypothesis that functional variation in the BDNF gene (Val66Met polymorphism, rs6265) affects brain reward circuitry encoding human judgment and decision-making regarding relative preference. We quantified relative preference among faces with emotional expressions (angry, fearful, sad, neutral, and happy) by a keypress procedure performed offline to measure effort traded for viewing time. Keypress-based relative preferences across the ensemble of faces were mirrored significantly by fMRI signal in the orbitofrontal cortex, amygdala, and hippocampus when passively viewing these faces. For these three brain regions, there was also a statistically significant group difference by BDNF genotype in the fMRI responses to the emotional expressions. In comparison with Val/Met heterozygotes, Val/Val individuals preferentially sought exposure to positive emotions (e.g., happy faces) and had stronger regional fMRI activation to aversive stimuli (e.g., angry, fearful, and sad faces). BDNF genotype accounted for approximately 30% of the variance in fMRI signal that mirrors keypress responses to these stimuli. This study demonstrates that functional allelic variation in BDNF modulates human brain circuits processing reward/aversion information and relative preference transactions.

Connecting multiple open wounds to a single negative-pressure dressing

We present a new technique for connecting open wounds to a negative-pressure device. In this technique, a flexible, small-diameter intravenous tube is used to bridge the gap between open wounds on the same extremity. After these connections are made, the first layer of plastic is placed, and only 1 fenestrated connection is made to the device. This technique allows use of multiple sponges with only 1 fenestrated cap and 1 connection to the device. The smaller intravenous tube must not be placed directly on skin, as it may cause a pressure ulcer underneath.

Bone That Best Matches the Properties of the Mandible

OBJECTIVE

The main advantage of primary oromandibular reconstruction using free vascularized bone-containing flaps is improved oral function from (1) the maintenance of mandibular and soft tissue architecture and (2) dental rehabilitation through osseointegrated implants. Bone dimensions, volume, quality, and the ability of the bone to withstand masticatory forces are important factors in achieving successful osseointegration. Previous studies have objectively examined the dimensions of bones used in oromandibular reconstruction, but few have addressed their biomechanical properties. The purpose of this study was to compare the dimensional and biomechanical properties of the bones commonly used in oromandibular reconstruction with those of the mandible.

METHODS

Eleven formalin-fixed cadavers were used. The mandibles, fibulae, iliac crests, scapulae, clavicles, second metatarsals, radii, and anterior ribs were harvested. Measurements of the dimensions of the bones were made with calipers at multiple sites. Three-point break strength and screw pulling force tests were then performed on all of the bones.

RESULTS

The fibulae, iliac crests, and clavicles had dimensions that best matched those of the mandible. The three-point break strength and screw pulling force tests were consistently the highest for the mandibles and fibulae, followed by the clavicles, scapulae, iliac crests, metatarsals, radii, and ribs, in that order.

CONCLUSIONS

The fibula is the bone that best matches the properties of the mandible.

Globalization of U.S. health care services: assessment and implementation

Globalization has become a commonly used term to describe the manner in which organizations in many industries have spread their operations and management to foreign countries. As the trend toward a global economy progresses, more and more industries, including health care, are looking to capitalize on its possible benefits. This article examines globalization in other industries and applies the tools used elsewhere to U.S. health care organizations.

Binding personal and peripersonal space: evidence from tactile extinction

Behavioral and neurophysiological studies suggest that the brain constructs different representations of space. Among these representations are personal and peripersonal space. Personal space refers to the space occupied by our bodies. Peripersonal space refers to the space surrounding our bodies, which can be reached by our limbs. How these two representations are bound to give a unified sense of space in which humans act is not clear. We tested 10 patients with tactile extinction to investigate this issue. Tactile extinction is an attentional disorder in which patients are unaware of being touched on their contralesional limb if they are also touched simultaneously on their ipsilesional limb. We hypothesized that mechanisms that bind personal and peripersonal representations would improve these patients' awareness of being touched on their contralesional limbs. Visual--tactile integration and intentional movements were considered candidate mechanisms. Patients were more likely to be aware of contralesional touch when looking towards their contralesional limb than when looking towards their ipsilesional limb, and when actively moving on tactile probes than when receiving tactile stimuli passively. The improved awareness of being touched on the contralesional limb under these conditions suggests that cross-sensory and sensorimotor integration help bind personal and peripersonal space.

Orientation bias in unilateral neglect: representational contributions

Left-neglect patients bisect horizontal lines to the right of true center. Longer lines are bisected further to the right than shorter lines. This line-length effect might be explained by an increase in the rightward bias of attention because longer lines extend further ipsilesionally. Alternatively, neglect patients might be limited in their abilities to internally represent horizontal magnitudes. Patients might orient further rightward with longer lines because these lines have longer representations. If the line-length effect occurs on lines of identical objective length but they are represented differently, then central mechanisms must contribute to the orientation bias. We constructed two types of lines that were perceived by normal subjects as having different lengths, but were of identical extents. Three neglect patients bisected lines perceived as longer, further to the right than lines perceived as shorter. These results demonstrate that relative magnitudes of internal representations contribute to the degree of bias in neglect patients.

Weighing the evidence for cross over in neglect

When patients with left-sided neglect are asked to bisect horizontal lines, they tend to place their marks to the right of the line's objective mid-point. However, when asked to bisect short lines they are either more accurate or paradoxically cross over and place their marks to the left of the objective mid-point. Previous explanations of the cross over phenomenon have considered specific aberrations of spatial attention. However, these explanations make no predictions about judgments of non-spatial stimuli. Two patients with right brain damage were asked to judge weights placed on both hands simultaneously. They were biased in reporting weights on the right as being heavier than those on the left. This rightward bias changed with lighter pairs of weights presented in the context of equal reference weights. In one patient the directional bias was eliminated and in the other the bias was reversed so that she was more likely to report the left weight as heavier than the right. These data suggest that a phenomenon analogous to cross over in line bisections also occurs with judgments of non-spatial stimuli. Representations of stimuli appear to be influenced by features of the stimuli encountered on-line and by memory traces of similar stimuli encountered previously. With an attentional deficit, memory traces influence the magnitude of the representation derived on-line disproportionately.

The art and science of chart review

BACKGROUND

Explicit chart review was an integral part of an ongoing national cooperative project, "Using Achievable Benchmarks of Care to Improve Quality of Care for Outpatients with Depression," conducted by a large managed care organization (MCO) and an academic medical center. Many investigators overlook the complexities involved in obtaining high-quality data. Given a scarcity of advice in the quality improvement (QI) literature on how to conduct chart review, the process of chart review was examined and specific techniques for improving data quality were proposed.

METHODS

The abstraction tool was developed and tested in a prepilot phase; perhaps the greatest problem detected was abstractor assumption and interpretation. The need for a clear distinction between symptoms of depression or anxiety and physician diagnosis of major depression or anxiety disorder also became apparent. In designing the variables for the chart review module, four key aspects were considered: classification, format, definition, and presentation. For example, issues in format include use of free-text versus numeric variables, categoric variables, and medication variables (which can be especially challenging for abstraction projects). Quantitative measures of reliability and validity were used to improve and maintain the quality of chart review data. Measuring reliability and validity offers assistance with development of the chart review tool, continuous maintenance of data quality throughout the production phase of chart review, and final documentation of data quality. For projects that require ongoing abstraction of large numbers of clinical records, data quality may be monitored with control charts and the principles of statistical process control.

RESULTS

The chart review module, which contained 140 variables, was built using MedQuest software, a suite of tools designed for customized data collection. The overall interrater reliability increased from 80% in the prepilot phase to greater than 96% in the final phase (which included three abstractors and 465 unique charts). The mean time per chart was calculated for each abstractor, and the maximum value was 13.7 +/- 13 minutes.

CONCLUSIONS

In general, chart review is more difficult than it appears on the surface. It is also project specific, making a "cookbook" approach difficult. Many factors, such as imprecisely worded research questions, vague specification of variables, poorly designed abstraction tools, inappropriate interpretation by abstractors, and poor or missing recording of data in the chart, may compromise data quality.

Sensory and response interference by ipsilesional stimuli in tactile extinction

Extinction is thought to be due to a pathologically limited attentional capacity in which multiple stimuli cannot be processed simultaneously to conscious awareness. Patients with tactile extinction are aware of being touched on a contralesional limb, but seem unaware of similar contralesional touch if touched simultaneously on their ipsilesional limb. The ipsilesional stimulus interferes and competes with the processing of the contralesional stimulus. Most theorists assume that the ipsilesional stimulus affects the sensory processing of the contralesional stimulus, although the precise functional level at which this interference occurs is not clear. We report a series of experiments using signal detection analyses to investigate tactile extinction in one patient (DC). These analyses revealed that ipsilesional stimuli, in addition to interfering with processing of contralateral sensations, also interfere with verbal reports of those sensations. This influence on responses suggests that interference in tactile extinction can occur at a post-perceptual level, further 'downstream' than previously thought.

Crossmodal and sensorimotor integration in tactile awareness

We investigated tactile awareness in three patients with tactile extinction of stimuli located on contralesional somatotopic space. Contralesional tactile awareness was enhanced when they gazed to the left and when they moved their limbs. We suggest that personal somatotopic and peripersonal space are integrated by polymodal and sensorimotor links, which allow us to be aware of and act effectively on stimuli in space.

Antimicrobial treatment of chronic osteomyelitis

Chronic osteomyelitis has been a difficult problem for patients and the treating physicians. Appropriate antibiotic therapy is necessary to arrest osteomyelitis along with adequate surgical therapy. Factors involved in choosing the appropriate antibiotic(s) include infection type, infecting organism, sensitivity results, host factors, and antibiotic characteristics. Initially, antibiotics are chosen on the basis of the organisms that are suspected to be causing the infection. Once the infecting organism(s) is isolated and sensitivities are established, the initial antibiotic(s) may be modified. In selecting specific antibiotics for the treatment of osteomyelitis, the type of infection, current hospital sensitivity resistance patterns, and the risk of adverse reactions must be strongly appraised. Antibiotic classes used in the treatment of osteomyelitis include penicillins, beta-lactamase inhibitors, cephalosporins, other beta-lactams (aztreonam and imipenem), vancomycin, clindamycin, rifampin, aminoglycosides, fluoroquinolones, trimethoprim-sulfamethoxazole, metronidazole, and new investigational agents including teicoplanin, quinupristin/dalfopristin, and oxazolidinones. Traditional treatments have used operative procedures followed by 4 to 6 weeks of parenteral antibiotics. Adjunctive therapy for treating chronic osteomyelitis may be achieved by using beads, spacers, or coated implants to deliver local antibiotic therapy and/or by using hyperbaric oxygen therapy (once per day for 90-120 minutes at two to three atmospheres at 100% oxygen).

Oral rifampin plus azithromycin or clarithromycin to treat osteomyelitis in rabbits

A rabbit model for Staphylococcus aureus osteomyelitis was used to compare 28-day combination antibiotic therapy using oral rifampin (40 mg/kg, twice daily) plus oral azithromycin (50 mg/kg, once per day), oral clarithromycin (80 mg/kg, twice daily), or parenteral nafcillin (30 mg/kg, four times daily). The left tibial metaphysis of New Zealand White rabbits was infected with Staphylococcus aureus. Grades 3 to 4 osteomyelitis (according to the Cierny-Mader classification system) development in the rabbits was confirmed radiographically. After antibiotic therapy regimens of 28 days, all tibias from controls that were infected but left untreated (n = 10) revealed positive cultures for Staphylococcus aureus at a mean concentration of 2.8 x 10(4) colony forming units/g bone. The rifampin plus clarithromycin (n = 15) and rifampin plus azithromycin (n = 15) groups showed significantly lower percentages of positive Staphylococcus aureus infection (20% and 13.3%, respectively) and bacterial concentrations (3.5 x 10(1) and 1.75 x 10(1) colony forming units/g bone, respectively). The osteomyelitic tibias of the nafcillin plus rifampin treated group (n = 7) showed no detectable Staphylococcus aureus infection (significantly lower than controls). The differences observed for bone bacterial concentrations and sterilization percentages between the antibiotic treated groups were not statistically significant. Although fluoroquinolones (including ofloxacin and ciprofloxacin) are the agents usually prescribed with rifampin, increasing resistance has been observed. Although macrolides traditionally are not used in the treatment of osteomyelitis, the results of this study indicate that azithromycin and clarithromycin may be attractive partners for rifampin for the treatment of Staphylococcus aureus osteomyelitis in humans.

A practical guide to the diagnosis and management of bone and joint infections

Infectious arthritis arises from haematogenous spread of organisms through the synovial membrane or from the direct extension of a contiguous infection. The diagnosis rests on the isolation of the pathogen(s) from joint fluid obtained by aspiration or from debridement. Synovial fluid analysis and Gram stains provide clues to the aetiology. The treatment of septic arthritis includes appropriate antimicrobial therapy and joint drainage. Bone infections are currently classified by the Waldvogel or Cierny-Mader classification. Cierny-Mader staging allows stratification and development of comprehensive treatment guidelines for each stage. Osteomyelitis therapy emphasises early diagnosis and aggressive treatment. Radiographs and bone cultures are the mainstays of diagnosis. Radionuclide scans, computerised tomography or magnetic resonance imaging may be obtained when the diagnosis of osteomyelitis is equivocal or to help gauge the extent of the infection. Medical therapy includes improving any host deficiencies, initial antibiotic selection and antibiotic modification based on culture results. Surgical treatment involves debridement of necrotic bone and tissue, obtaining appropriate cultures, managing dead space and, when necessary, obtaining bone stability.

In vitro evaluation of antibiotic diffusion from antibiotic-impregnated biodegradable beads and polymethylmethacrylate beads

Antibiotic-impregnated beads are used in the dead bone space following debridement surgery to deliver local, high concentrations of antibiotics. Polymethylmethacrylate (PMMA), 2,000-molecular-weight (MW) polylactic acid (PLA), Poly(DL-lactide)-coglycolide (PL:CG; 90:10, 80:20, and 70:30), and the combination 2,000-MW PLA-70:20 PL:CG were individually mixed with clindamycin, tobramycin, or vancomycin. Beads were placed in 1 ml of phosphate-buffered saline (PBS) and incubated at 37 degrees C. The PBS was changed daily, and the removed PBS samples were stored at -70 degrees C until the antibiotic in each sample was determined by microbiological disk diffusion assay. Nondissolving PMMA beads with tobramycin and clindamycin had concentrations well above breakpoint sensitivity concentrations (i.e., the antibiotic concentrations at the transition point between bacterial killing and resistance to the antibiotic) for more than 90 days, but vancomycin concentrations dropped by day 12. ALl PLA, PL:CG, and the 2,000-MW PLA-70:30 PL:CG biodegradable beads release high concentrations of all the antibiotics in vitro for the period of time needed to treat bone infections (i.e., 4 to 8 weeks). Antibiotic-loaded PLA and PL:CG beads have the advantage of better antibiotic elution and the ability to biodegradable (thereby averting the need for secondary surgery for bead removal) compared to the PMMA beads presently used in the clinical setting.

Long-bone osteomyelitis diagnosis and management

The pathogen may proliferate years after seemingly successful treatment. The authors describe a classification system to evaluate both the disease and the patient's capacity to undergo the rigors of therapy. Two cases illustrate the clinical issues.

Diagnoses and staging. Osteomyelitis and prosthetic joint infections

The diagnoses of osteomyelitis and prosthetic joint infections are usually made on the basis of clinical, laboratory, and radiographic examination. The diagnostic studies presently employed to diagnosis and assess osteomyelitis and prosthetic joint infections are described. A universally applied classification system for stratifying osteomyelitis and prosthetic joint infection would provide a framework for the evaluation of medical and surgical treatment efficacy. Such a system would enable treatment results to be compared among institutions. Staging systems currently being used are described.

A comparison of gentamicin-impregnated polymethylmethacrylate bead implantation to conventional parenteral antibiotic therapy in infected total hip and knee arthroplasty

A multicenter study of infected total knee and total hip arthroplasties was conducted from 1985 until 1990. Twenty-eight patients (22 total hip arthroplasties and six total knee arthroplasties) who had periprosthetic infections were treated according to a prospective, randomized protocol. After initial debridement for their infections, patients were randomized into one of the two following groups: Group I, debridement and the implantation of gentamicin-polymethylmethacrylate (PMMA) beads; and Group 2, debridement and conventional parenteral systemic antibiotic therapy. After initial treatment, the patients were then scheduled for a delayed reconstruction total joint arthroplasty. Of the 28 patients, 25 subsequently had delayed total arthroplasty, and if acrylic bone cement was used for fixation at the time of reimplantation, antibiotics were not added to the cement. The average follow-up period was three years (range, six months to 5.6 years). Infection recurred in two patients treated by debridement and the implantation of gentamicin-PMMA beads (15%) and in four patients treated with debridement and conventional systemic antibiotic therapy (30%). All recurrences occurred in patients who had infected total hip arthroplasties; none occurred in patients with total knee arthroplasties. The conditions that were common in patients with recurrent infection were (1) multiple previous surgeries, (2) host compromise and malnutrition, (3) extensive infection, and (4) inadequate debridement. The recurrence of infection was not statistically significantly more common in either treatment group. The outcome of treatment in patients with infected total joint arthroplasties using debridement, gentamicin-PMMA bead implantation,and a two-stage delayed reconstruction was similar to that of patients treated with debridement combined with conventional parenteral systemic arthroplasty and two-stage reconstruction.

Antimicrobial treatment of osteomyelitis

Parenteral antibiotic therapy remains the mainstay of antimicrobial therapy for osteomyelitis. In acute cases, empirical treatment may be used initially, but antibiotic selection should ideally be based on deep aspiration or bone cultures with corresponding in vitro sensitivity testing. The drug exhibiting the highest bacteriocidal activity with the least toxicity and lowest cost should be chosen. Antibiotic treatment will not substitute for surgical debridement of infected devitalized bone. The length of treatment with parenteral therapy remains controversial. The six-week benchmark, which was determined largely by experience with childhood hematogenous osteomyelitis, may not be applicable to contiguous focus osteomyelitis after trauma in adults. The goal of surgical treatment is to convert an infection with dead bone to a situation with well-vascularized tissues that are readily penetrated by blood-borne antibiotics, making prolonged drug treatment unnecessary.

In vitro and in vivo evaluation of antibiotic diffusion from antibiotic-impregnated polymethylmethacrylate beads

The elution of antibiotics from antibiotic-impregnated polymethylmethacrylate (PMMA) beads was measured in mongrel dogs. The antibiotics, used in mixture with Simplex cement, included cefazolin (Ancef; 4.5 g/40 g cement powder), ciprofloxacin (Cipro; 6 g/40 g powder), clindamycin (Cleocin; 6 g/40 g powder), ticarcillin (Ticar; 12 g/40 g powder), tobramycin (Nebcin; 9.8 g/40 g powder), and vancomycin (Vancocin; 4 g/40 g powder). After a pneumatic drill was used to dredge a trough in the tibia, five beads were implanted. During the next 28 days, seroma samples and serum samples were taken for antibiotic measurements. On Day 28, the dogs were killed, beads removed, and the seroma, serum, bone, and granulation tissue sampled. The results of the study showed that clindamycin, vancomycin, and tobramycin exhibited good elution characteristics and had consistently high levels in bone and granulation tissue.

Oral ciprofloxacin compared with standard parenteral antibiotic therapy for chronic osteomyelitis in adults

A group of fourteen patients who had chronic osteomyelitis and were treated with oral ciprofloxacin was compared with a group of twelve patients of similar age who had chronic osteomyelitis and received standard parenteral antibiotic therapy consisting of nafcillin, clindamycin, and gentamicin, singly or in combination. The osteomyelitis was arrested at the end of therapy and on follow-up examination of eleven patients in the first group and ten in the second group. The average duration of antibiotic therapy (thirty-eight days) and follow-up (approximately thirty months) were about the same for both groups. Oral administration of ciprofloxacin was as effective and safe as parenteral therapy for the treatment of osteomyelitis in these adults.

Simultaneous surgery for bilateral congenital cataracts

In about one third of patients congenital cataracts are bilateral. If the cataracts are dense, and the patient an infant, bilateral simultaneous cataract removal reduces anesthetic risk, hospital stay, and cost and allows earlier optical correction. This study represents a retrospective survey of 32 eyes (16 cases) with simultaneous surgery for bilateral congenital cataracts. Bilateral simultaneous surgery can be performed to avoid a second general anesthesia in infants who have bilateral dense congenital cataracts.

Randomized, prospective double-blind trial of metoclopramide and placebo for gastroesophageal reflux in infants

The effect of metoclopramide on gastroesophageal reflux was studied in 30 infants less than 1 year of age. Gastroesophageal reflux was documented in all infants by extended pH monitoring before enrollment in the study. Patients were randomly assigned to receive metoclopramide 0.1 mg/kg or placebo four times a day, 1/2 hour before feeding for 1 week, followed by the alternate regimen for 1 week. The infants were reevaluated with extended pH monitoring and scintigraphy after 4 to 7 days of each treatment. A symptom score was derived by determining the average number of occurrences of all symptoms recorded daily by parents on a symptom checklist during pretreatment, placebo, and metoclopramide treatment periods. There was a difference between pretreatment evaluation and placebo periods with respect to daily symptom scores (p less than 0.005), reflecting a significant placebo response. However, no difference in scintigraphic study was found between placebo and metoclopramide periods. A significant difference between placebo and metoclopramide periods was noted in the percentage of time esophageal pH was less than 4.0 (p less than 0.001). However, although metoclopramide decreased the proportion of time esophageal pH was less than 4.0, pH remained less than 4.0 for more than 5% of the time in most patients. Substratification of the total group into infants younger and older than 3 months revealed that older infants had greater average daily weight gain during the metoclopramide treatment period (34.3 gm/day) than in the placebo treatment period (6.6 gm/day, p = 0.05). We conclude that metoclopramide in the dosage 0.1 mg/kg four times daily reduces reflux in infants and may be useful for infants with poor weight gain and other serious complications of gastroesophageal reflux.

Bacterial osteomyelitis. Adjunctive hyperbaric oxygen therapy

Mechanistically, hyperbaric oxygen (HBO) appears useful for the treatment of osteomyelitis. HBO increases the oxygen tension in infected tissue, including bone. An adequate oxygen tension is necessary for oxygen-dependent killing of organisms by polymorphonuclear leukocytes, and for fibroblast activity leading to angiogenesis and wound healing. In addition, HBO augments the killing of Pseudomonas aeruginosa by the aminoglycoside tobramycin. At the University of Texas Medical Branch in Galveston, adjunctive HBO is used for Cierny-Mader stage 3B and 4B osteomyelitis.

Mycobacterium marinum flexor tenosynovitis

Four culture-positive cases of flexor tenosynovitis of the hand caused by Mycobacterium marinum are reported. The organisms were cultured at 32 degrees. All patients were treated with a combination of flexor tenosynovectomy and antimycobacterial treatment with ethambutol and rifampin. The length of antimycobacterial treatment ranged from nine to 22 months. All four patients responded to treatment with cessation of signs of infection, increased range of motion, and complete wound healing.

Chest diseases: benefits of hyperbaric oxygen therapy in infectious disease

The Scientific Board of the California Medical Association presents the following inventory of items of progress in chest diseases. Each item, in the judgment of a panel of knowledgeable physicians, has recently become reasonably firmly established, both as to scientific fact and important clinical significance. The items are presented in simple epitome and an authoritative reference, both to the item itself and to the subject as a whole, is generally given for those who may be unfamiliar with a particular item. The purpose is to assist busy practitioners, students, research workers, or scholars to stay abreast of these items of progress in chest diseases that have recently achieved a substantial degree of authoritative acceptance, whether in their own field of special interest or another.The items of progress listed below were selected by the Advisory Panel to the Section on Chest Diseases of the California Medical Association and the summaries were prepared under its direction.

The effect of implant axial and torsional stiffness on fracture healing

A study was performed to compare the mechanical properties of healing transverse femoral osteotomies fixed with either (a) plates of high or low axial stiffness (compression or slotted plates) but equivalent bending and torsional stiffnesses, or (b) rods of high or low torsional stiffness (solid or slotted rods) but equivalent bending and axial stiffnesses. Compression and slotted plates were implanted contralaterally in one group of adult mongrel dogs and solid or slotted rods were implanted contralaterally in a second group as fixation for transverse osteotomies. We found that the compression-plated femora regained strength and stiffness earlier than the slotted-plated femora and healed with less callus formation. The femora fixed with rods healed with no significant differences in properties at any time interval. Also, the femora fixed with rods had mechanical properties close to those of the slotted-plated femora and lower than those of the compression-plated femora at the same time intervals. We concluded that contact compression caused the differences in the healing results and was more important than differences in torsional or axial rigidity of the implant.

Tumoral calcinosis: a case report and review of the literature

Tumoral calcinosis rarely occurs in the hand. It is an uncommon familial disease suggesting an autosomal recessive gene pattern, often with laboratory findings of hyperphosphatemia and normocalcemia. Our patient had bilateral hand involvement, including local calcinosis cutis of the skin and bone changes not previously reported in the literature. At a 2-year follow-up after two lesions were excised from her left hand, one lesion had completely resolved and the other recurred. Two large symptomatic lesions and one area of local calcinosis cutis in her right hand have recently been excised.

Multiple sexually transmitted diseases

There are at least 16 possible sexually transmitted diseases, and it is not uncommon to find patients suffering from two or more sexually transmitted infections or infestations. Case histories of two men, one with gonorrhea, scabies, and pediculosis pubis, the other with syphilis and scabies, illustrate this point. It is to be emphasized that when one venereal disease is found, the clinician should look for another.

The Personal Reactions Inventory: a scale to measure depressive attributions

Assessed reliability and validity for an instrument that was designed to assess depressiform cognitions. Following the model proposed by Abramson et al. (1978) the scale was developed in order to evaluate attributions of internal vs. external responsibility, situational specificity or generality, and temporal stability or instability. Because the model also proposes that one's attributions vary as a function of the positive or negative consequences that occur in a situation, the scale varied the type of consequence to which a cause was being attributed. Initial item validation was undertaken with a sample of 17 graduate students and faculty members who rated the response alternatives. Subsequent internal validity, reliability, and convergent validity were assessed on 184 undergraduate students. The results suggest that the scale is promising for the assessment of depressiform attributions. However, a strong sex effect also was noted in some of the characteristics of attribution and suggests the need to evaluate sexual-cultural differences in attributional processes associated with depression.

Dermoid cysts in children

A retrospective study of dermoid cysts in children over the past 13 years at St. Christopher's Children's Hospital of Philadelphia, showed that 37% of the dermoids in the body occurred in the orbital and peri-orbital areas. An unusually high percentage of these occurred in the left eyebrow which appears to be the most frequent location for dermoid cysts in children. Dermoid cysts are a very common lesion encountered by ophthalmologists inasmuch as 3.3% of all ophthalmic surgical procedures in children were performed for dermoids. All 231 cases in this series were benign. The manner and time of presentation of these lesions are discussed as well as the treatment.

Corneal clouding with increased acid mucopolysaccharide accumulation in Bowman's membrane

Two infants had bilateral congenital corneal clouding and abnormal acid mucopolysaccharide accumulation in a thickened Bowman's membrane. This unusual entity was not associated with acid mucopolysaccharide deposits in the skin and visceral tissues or with increased levels of acid mucopolysaccharide in the urine. The similarity and differences have been compared to the systemic mucopolysaccharidosis and macular corneal dystrophy.

Deep orbital dermoid with draining sinus

A dermoid cyst in a 6-year-old girl, deep within the orbit, extended from the apex, through the lateral wall, via a fistulous tract to the skin, forming a draining sinus. Both the deep location and the cutaneous drainage of the cyst are rare presentations of this tumor. We used a Krönlein orbitotomy to successfully remove the tumor without loss of vision.