Effects of thymoquinone in the lungs of rats against radiation-induced oxidative stress.

OBJECTIVE: Radiotherapy is an important treatment for a wide variety of malignancies, although many cancer patients who receive radiotherapy suffer from serious side effects during and after their treatment. Thymoquinone (TQ), the main active ingredient of Nigella sativa, has been reported to have various pharmacological properties, such as antioxidant, hepatoprotective, neuroprotective, antidiabetic, anti-inflammatory, nephroprotective, anticarcinogenic in many pharmacological and toxicological studies. In this study, we aimed to investigate whether there is a radioprotective effect of TQ on the lung tissue of rats exposed to ionizing radiation. MATERIALS AND METHODS: This study was designed as a prospective, placebo-controlled study. A total of 40 Sprague-Dawley rats were divided into four groups to test the radiation-protective effectiveness of TQ administered by intraperitoneal injection. Biochemical parameters were studied to assess the radiation-protective effects of TQ. RESULTS: Oxidative stress parameters, such as oxidative stress index (OSI), lipid hydroperoxide (LOOH) and total oxidant status (TOS), in lung tissue of the rats treated with TQ, were found to be lower than in received irradiation alone. Anti-oxidative parameters, such as total antioxidant status (TAS) level and paraoxonase (PON) activity, were statistically higher in the TR (IR plus TQ group) group compared with other groups. CONCLUSIONS: Findings show that TQ clearly protects lung tissue from radiation-induced oxidative stress and can be used as a radioprotective agent.

Impact of pre-test information on patient compliance with the spirometry protocol: a randomized controlled clinical trial.

OBJECTIVE: This study evaluated the effect of brochure-based and video-assisted information provided before spirometry on patient compliance. PATIENTS AND METHODS: This was a randomized controlled clinical trial. Before the test, subjects in intervention groups were shown a leaflet outlining the steps of the spirometry protocol and a video prepared for the same purposes. The control group was given standard routine information by the technician before spirometry. RESULTS: The study included 450 patients. We found a significant correlation between compliance status and age, female sex, being a non-smoker, having no known lung disease, investigating respiratory disease as an indication for spirometry, having first-time spirometry, and receiving pre-test information via leaflets. Variables of age, sex, smoking, indication for spirometry, diagnosis, and previous spirometry, which were found in multivariate analysis to be associated with 'compliance with the test protocol' were further processed using regression analysis which identified 'previous spirometry' as the most decisive variable affecting 'compliance with the test protocol'. CONCLUSIONS: Providing information via brochure-based and video-supported information did not contribute to compliance with the testing protocol, leading us to the conclusion that such informative tools do not provide an additional contribution. Previous spirometry experience was the most decisive parameter influencing adherence to the test protocol.

Compliance level to Tuberculosis prophylaxis in patients undergoing therapy with tumor necrosis factor-alpha inhibitors: a cross-sectional study.

OBJECTIVE: Tumor necrosis factor-alpha (TNF-α) inhibitors are used to treat autoimmune diseases such as rheumatoid arthritis, ankylosing spondylitis, and inflammatory bowel disease. However, patients using TNF-α inhibitors are at a high risk of developing tuberculosis. Therefore, this study aimed to evaluate the compliance level of patients who were prescribed TNF-α-based tuberculosis prophylactic treatment. PATIENTS AND METHODS: The study included 135 patients who were followed up at a tuberculosis dispensary between December 2020 and June 2021 and agreed to participate in the study. The study was conducted after obtaining necessary permissions from the institution, ethics committee, and patients. Data were collected using a questionnaire and evaluated using the Medication Adherence Report Scale (MARS). The MARS scale scores range from 5 to 25, with high scores indicating a high level of "medication compliance level". RESULTS: Of the included patients, 42.2% were females, 46.7% were primary school graduates, and their mean age was 43.75±11.86 years. Additionally, 35.6% of patients had ankylosing spondylitis, among whom 54.1% had a disease duration of 1-5 years and 57.8% had been using TNF-α inhibitors for a year. Of the patients taking isoniazid (INH) for tuberculosis prophylaxis, 47.4% missed their prescribed INH doses, with "forgetfulness" being the reason in 28.9% of these patients. The patients had a mean MARS score of 15.71±6.18. CONCLUSIONS: Patients using TNF-α inhibitors were found to have "moderate" compliance levels for INH-based prophylactic therapy. It is recommended that the compliance levels of patients and factors influencing their compliance should be regularly monitored.

Epidemiological trends and seasonal dynamics of tuberculosis in Southeastern Turkey.

Background: Tuberculosis (TB) is an important public health issue. Determining TB trend and seasonal variability provides useful information for designing treatment strategies and control programs. Aim: The present study attempts to investigate the epidemiological trend and the seasonal variations. Materials and Methods: TB data containing 2450 cases were collected over a period of seven years in the province of Diyarbakir in southeast Turkey. Trend function and seasonal variability were investigated by statistical curve fitting, surface fitting, and autoregressive time series analysis. Results: The study revealed a gradually decreasing trend in the number of TB cases over a period of seven years. Total TB incidence had seasonal variations (P = 0.04); there was a greater number of TB cases between April and July, with a peak in June. There were significant monthly seasonal variations with June peaks among females (P < 0.001), in patients in the age groups of 0-15 (P < 0.001) and 36-45 years (P < 0.001), in new cases (P < 0.001) and in the patients with pulmonary TB (P = 0.01). The extra-pulmonary TB cases peak in May (P = 0.01). Pulmonary TB and TB patients in the 36-45 age group had summer peak, while the other groups peaked at spring. Conclusions: Spring and summer peaks detected in total TB cases and in many subgroups indicate that multicenter and comprehensive clinical studies are needed to explain these variations.

Prevalence of sleep disturbance in chronic pain.

OBJECTIVE: Sleep is a vital function for human beings, which can be affected by several factors. Chronic pain is one of these factors where it is the most frequent cause for seeking medical care in combination with insomnia. The aim of this study is to examine the prevalence and relationship between sleep disturbance and chronic pain. PATIENTS AND METHODS: After approval, a total of 85 Family Medicine Units from over 170 in Tokat were randomly selected using a 50% sampling. A sample of 2635 subjects, over the age of 19 years, who were registered with the selected Family Medicine Units, were assessed due to gender, age group, and the urban/rural population size of Tokat using the stratified sampling method. The sample size distribution was calculated as 1515 urban subjects, 1120 rural subjects; 1345 female subjects, 1290 male subjects; 1123 subjects between 20-39 years of age, 1103 subjects between the ages of 40-64, and 409 subjects over 64 years of age. After sampling, subjects were invited to participate in the study via an invitation letter, and agreeing individuals were taken to the Family Medicine Unit for face-to-face meetings. Written, informed consent was obtained, along with demographic data. The presence of chronic pain was recorded. According to the presence of chronic pain, all subjects were separated into two groups as Group Chronic Pain and Group Non-Chronic Pain. The visual analog scale for pain intensity, and Pittsburgh Sleep Quality Index for sleep quality, were performed with all subjects. A multiple linear regression model was used to assess the predictors of sleep quality. Analyses were conducted using the Statistical Package for Social Sciences program (SPSS Inc., Chicago, IL, USA), version 20.0. The statistical significance for all analyses was set at p < 0.05. RESULTS: The mean global Pittsburgh Sleep Quality Index score of Group Chronic Pain (5.30 ± 4.29) was significantly higher than in Group Non-Chronic Pain (3.22 ± 3.30; p < 0.01). The mean Pittsburgh Sleep Quality Index scores of females (5.69 ± 4.40) were significantly higher than males (4.54 ± 3.96) in Group Chronic Pain (p = 0.000045). A total of 40.7% of patients in Group Chronic Pain, and 21.9% in Group Non-Chronic Pain demonstrated poorer sleep quality according to the Pittsburgh Sleep Quality Index scores, with a cut-off level > 5. A moderate positive correlation was found between the global Pittsburgh Sleep Quality Index and Visual Analog Scale scores (r = 0.310, p < 0.01). A multiple linear regression analysis showed that age, gender, income, Visual Analog Scale, and presence of depression were the significant predictors for Pittsburgh Sleep Quality Index score. CONCLUSIONS: The current study revealed that chronic pain and pain intensity are important predictors of sleep quality.

Central nervous system toxicity after acute oral formaldehyde exposure in rabbits: An experimental study.

Formaldehyde (FA) is one of the most widely used chemical compounds in industrial field. It is described as toxic, particularly to the nervous system, the urogenital system, and the respiratory tracts. In this study, we determined the effects of acute oral exposure to FA in rabbit brain tissue. A total of 16 rabbits were selected and divided into 2 groups: formaldehyde group (group F) and control group (group C). FA was administered to group F at a rate of 40 mg/kg/day via a nasogastric tube for 5 days. Saline was similarly administered to the eight controls. All the animals were euthanized after 5 days of exposure, and brain tissue samples were collected in 10% neutral formalin and embedded in paraffin. To investigate the effects of FA on the apoptotic process, we examined active caspase-3, Bax, and Bcl-2 immunohistochemical expression and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate -biotin nick-end labeling (TUNEL) reactivity in the rabbit brains. In addition, glial fibrillary acidic protein (GFAP) was biochemically assessed in brain tissue samples for neurotoxicity. We found that FA treatment caused a significant decrease in Bcl-2 expression and an increase in active caspase-3 and Bax expressions as well as an increase in the number of TUNEL-positive apoptotic cells. The GFAP level was found to be significantly higher in group F. In conclusion, acute oral exposure to FA caused DNA damage, apoptosis, and neuronal injury in the rabbit brains.

Effects of isoflurane in an intoxication model: experimental study.

BACKGROUND: Isoflurane is a volatile anaesthetic that has been commonly used since 1980. The major metabolites of isoflurane are fluoride ion and trifluoroacetate, both excreted in the urine. AIM: This study manage to show the histopathological findings of ingested isoflurane on liver, kidney and lugs in an animal model. Twenty-one rabbits were selected and divided into three groups: Group Isoflurane-5 (I-5); Group Isoflurane-10 (I-10); and Group Control (C). Each group consisted of seven rabbits. I-5 and I-10 received 5 ml/kg and 10 ml/kg of liquid isoflurane, respectively, via nasogastric tube, while C received 5 ml/kg saline (0.9% NaCI). All animals in I-5 and I-10 were sacrificed without anesthetic drug administration. Tissue samples from livers, kidneys and lungs were collected, preserving tissue unity and avoiding infliction of any trauma. Samples were fixed in 10% formalin solution, embedded in paraffin blocks and sliced into 5 µm sections. To investigate the effects of isoflurane, sections were examined under light microscope and histopathological changes were scored. RESULTS: Mean injury scores and the appearance of portal lymphocyte infiltration in liver samples showed significant increases in I-5 and I-10 compared to C (p = 0.005, p = 0.001 and p = 0.001, respectively). Mean lung injury scores revealed significant increases after isoflurane treatment in I-5 and I-10 compared to C (p = 0.026 and p = 0.017, respectively). CONCLUSIONS: Ingested isoflurane led to mild liver and lung injuries in rabbits.

A massive binary black-hole system in OJ 287 and a test of general relativity.

Tests of Einstein's general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Newton's theory. Binary pulsars provide a means of probing the strong gravitational field around a neutron star, but strong-field effects may be best tested in systems containing black holes. Here we report such a test in a close binary system of two candidate black holes in the quasar OJ 287. This quasar shows quasi-periodic optical outbursts at 12-year intervals, with two outburst peaks per interval. The latest outburst occurred in September 2007, within a day of the time predicted by the binary black-hole model and general relativity. The observations confirm the binary nature of the system and also provide evidence for the loss of orbital energy in agreement (within 10 per cent) with the emission of gravitational waves from the system. In the absence of gravitational wave emission the outburst would have happened 20 days later.

Effectiveness of transmeatal low power laser irradiation for chronic tinnitus.

OBJECTIVE: To evaluate effectiveness of 5 mW laser irradiation in the treatment of chronic tinnitus. STUDY DESIGN: Prospective, randomised, double-blind study. METHODS: This investigation included 66 ears in 45 patients with chronic unilateral or bilateral tinnitus. A 5 mW laser with a wavelength of 650 nm, or placebo laser, was applied transmeatally for 15 minutes, once daily for a week. A questionnaire was administered which asked patients to score their symptoms on a five-point scale, before and two weeks after laser irradiation. A decrease of one scale point, regarding the loudness, duration and degree of annoyance of tinnitus, was accepted to represent an improvement. RESULTS: The loudness, duration and degree of annoyance of tinnitus were improved, respectively, in up to 48.8, 57.7 and 55.5 per cent of the patients in the active laser group. No significant improvement was observed in the placebo laser group. CONCLUSION: Transmeatal, low power (5 mW) laser irradiation was found to be useful for the treatment of chronic tinnitus.

Iloprost-induced sudden hearing loss.

We report a patient who developed sudden, bilateral, sensorineural hearing loss during therapeutic use of iloprost for Raynaud's phenomenon. The sudden hearing loss was attributed to iloprost use and completely reversed in eight days with conservative therapy. Iloprost may be a potentially ototoxic drug, causing sudden hearing loss.

Human papilloma virus prevalence in laryngeal squamous cell carcinoma.

PURPOSE: To determine the prevalence and type of human papilloma virus deoxyribonucleic acid (DNA) in cases of laryngeal squamous cell carcinoma. METHODS: We analysed the prevalence of human papilloma virus infection in archived paraffin block specimens taken from 99 cases of laryngeal squamous cell carcinoma between 1990 and 2005, using polymerase chain reaction techniques. Biopsy specimens from five proven verrucous skin lesions were used as positive controls, and peripheral blood samples from five healthy volunteers were used as negative controls. RESULTS: Four test samples were found to have inadequate deoxyribonucleic acid purity and were therefore excluded from the study. Human papilloma virus deoxyribonucleic acid was detected in seven of 95 cases of laryngeal squamous cell carcinoma (7.36 per cent). Human papilloma virus genotyping revealed double human papilloma virus infection in three cases and single human papilloma virus infection in the remaining four cases. The human papilloma virus genotypes detected were 6, 11 and 16 (the latter detected in only one case). CONCLUSION: In our series, a very low human papilloma virus prevalence was found among laryngeal squamous cell carcinoma cases. The human papilloma virus genotypes detected were mostly 6 and/or 11, and 16 in only one case. To the best of our knowledge, this is the first report of human papilloma virus prevalence in laryngeal squamous cell carcinoma, based on polymerase chain reaction genotyping in a Turkish population.

Oral multiple w/o/w emulsion formulation of a peptide salmon calcitonin: in vitro-in vivo evaluation.

BACKGROUND: Salmon calcitonin (sCT) is a polypeptide hormone consisting of 32 amino acid residues (MW approx. 3400 Da), which can be used successfully for the treatment of osteoporosis, Paget's disease and hypercalcaemia. Only nasal and parenteral preparations of sCT are currently available, and as injections are poorly accepted by patients, nonparenteral preparations for oral, rectal and nasal administration are highly desirable. However, oral sCT is poorly bioavailable, being susceptible to enzymatic degradation in the gastrointestinal tract. OBJECTIVES: To design a formulation of sCT suitable for oral use. METHOD: A water/oil/water (w/o/w) type multiple emulsion formulation was designed for oral application of sCT. sCT was placed in the inner water phase, and a protease inhibitor, aprotinin, was included in the outer water phase of this system to investigate the influence of protease inhibitors in the presence of sCT. The effectiveness of the formulation was evaluated in vitro by placing emulsion samples in a dialysis medium and in vivo by using a rat model. RESULTS: Incorporating sCT in the inner aqueous phase of a w/o/w emulsion appears to protect the peptide from enzymatic degradation. sCT was further protected by incorporating the protease inhibitor, aprotinin, in the outer aqueous phase. CONCLUSION: w/o/w emulsion formulations appear to be promising carrier systems for peptide-protein drugs.