Keratometry, biometry, and prediction of intraocular lens power in adult tigers (Panthera tigris)

OBJECTIVE To calculate the necessary pseudophakic intraocular lens (IOL) power to approximate emmetropia in adult tigers. ANIMALS 17 clinically normal adult tigers. PROCEDURES 33 eyes of 17 clinically normal adult tigers underwent routine ophthalmic examination and B-scan ultrasonography while anesthetized for unrelated procedures. Specific ultrasound data (globe measurements and corneal curvature) and estimated postoperative IOL positions were utilized to calculate predicted IOL power by use of Retzlaff and Binkhorst theoretical formulas. Applanation tonometry and refraction were also performed. RESULTS Mean ± SD axial globe length was 29.36 ± 0.82 mm, preoperative anterior chamber depth was 7.00 ± 0.74 mm, and crystalline lens thickness was 8.72 ± 0.56 mm. Mean net refractive error (n = 33 eyes) was +0.27 ± 0.30 diopters (D). By use of the Retzlaff formula, mean predicted IOL power for the postoperative anterior chamber depth (PACD), PACD – 2 mm, and PACD + 2 mm was 43.72 ± 4.84 D, 37.62 ± 4.19 D, and 51.57 ± 5.72 D, respectively. By use of the Binkhorst equation, these values were 45.11 ± 4.91 D, 38.84 ± 4.25 D, and 53.18 ± 5.81 D, respectively. Mean intraocular pressure for all eyes was 14.7 ± 2.69 mm Hg. CLINICAL RELEVANCE The calculated tiger IOL was lower than reported values for adult domestic felids. Further studies evaluating actual PACD and pseudophakic refraction would help determine the appropriate IOL power to achieve emmetropia in this species.

Clinically relevant doses of methylphenidate elicit behavioral sensitization and impair cognition on drug withdrawal in normal adult rats

Methylphenidate (MPD), a psychostimulant, is the first line drug for improving cognitive performance in attention deficit hyperactivity disorder (ADHD). A non-prescription use of this drug for improving performance is also becoming increasingly known. A growing rise in its medical and nonmedical use suggests that the drug is addictive.The present study was designed to ascertain the reinforcing and withdrawal effects of clinically relevant doses of methylphenidate on cognitive behavior of normal adult rats. Potential addictive effects and withdrawal effects on cognition were also determined.Effects of MPD in improving cognition were monitored after drug administration as well as withdrawal using Morris Water Maze test. Taking behavioral sensitization as an important contributing factor of drug addiction; addictive effects of MPD were also determined. Data analysis was done on SPSS version 13 by one-way and two-way ANOVA (repeated measure design) where applicable; post hoc comparisons were done by Tukey’s test. Repeated oral administration of MPD (0.5 and 1mg/kg) for six days produced behavioral sensitization and reduced daily food intake. After six days of treatment rats were repeatedly administered/withdrawal from repeated administration of MPD to investigate effects of MPD on cognitive behaviors. Results showed an improvement in cognition in rats repeatedly administered with MPD (0.5 and 1 mg/kg). Whereas, withdrawal from repeated administration of MPD impaired short term memory, long term memory and memory retention. Doses of MPD which improve learning and memory are potentially addictive and elicit behavioral sensitization. Use of drug in healthy subjects can impair performance below basal levels particularly in drug withdrawal conditions.

ANTHROPOMETRIC MEASUREMENTS OF AURICLE IN POPULATION OF UTTAR PRADESH

External ear consists of auricle or pinna and external acoustic meatus. The auricle projects to a variable and individual degree from the side of the head. According to many studies conducted on morphometry of external ear; the size, shape and the orientation of each external ear is unique as ngerprint but it can be generalized. Males have larger ears as compared to females. The present study is attempted provide anthropometric data on normal adult male and female auricles from population of Uttar Pradesh. To st AIM: udy the anthropometric measurements of auricle in population of Uttar Pradesh. MATERIALS AND METHODS: This study was conducted on 420 adults (210 males and 210 females) who were randomly selected from the population of Uttar Pradesh. The parameters measured were, ear length, ear breadth lobule length and lobule width of both ears. RESULTS: In our study, we found that both the ears are equal dimension except for lobule breadth, irrespective of the sex. CONCLUSION: Knowledge of normal ear dimensions is important in the diagnosis of congenital malformations and acquired deformities, and in planning of treatment. The data presented in this study would help the clinician to produce an anatomically correct ear during its reconstruction.

Study of Ventricular Interdependence in Hemodialysis Patients

Background and objectivesStudy of respiratory variations in mitral valve (MV) Doppler flow in hemodialysis (HD) patients has not been investigated and normal adult referenced echocardiographic value is used as an echocardiographic reference to HD patients who have unique hemodynamic. This work aimed to study the respiratory variation in MV Doppler flow in HD patients to determine if it has a unique pattern in these patients, and to study any relation between this variation and volume-related parameters.MethodsWe conducted a prospective cohort study, carried out on 118 patients who underwent regular HD. A standard echocardiography was performed on the patients before and within 6 hs after dialysis. During quiet breathing, the transmitral spectral Doppler E wave was measured during inspiratory and expiratory phases using plethysmography breath-cycle chest-adhesive electrodes. The mathematic differences and the percent changes (ventricular interdependent; VI) in E wave were calculated pre-and post-dialysis. Post dialysis difference in the percent changes (∆ E wave % changes) was calculated as follows: pre-dialysis percent changes of E wave – post dialysis percent changes of E wave/pre dialysis percent changes E wave x 100. ResultsThe means of the mathematic differences between the MV inspiratory and expiratory E pre-and post-dialysis were 0.07 ± 0.18 m/s and 0.08 ± 0.22 m/s respectively with an insignificant difference between both phases; p = 0.337. Meanwhile, the means of the percent variation in the MV inspiratory and expiratory E pre-and post-dialysis were 56 ± 7 % and 44 ± 1.1 % respectively, with a significant reduction after dialysis; P = 0.000. Spearman correlation showed a significant positive correlation between post- dialysis ∆ E wave % change and post-dialysis % change of weight (r = 0.318; P = 0.000). Moreover, post- dialysis % change of weight and post- dialysis % changes of most other volume-related variable were independent predictors of post- dialysis ∆ E wave % in HD patients. ConclusionThe pre- and post- dialysis respiratory changes in the MV E wave in HD patients were higher than the normal adult referenced values. This marked variation could be explained by the unique overloading condition and could explain the LV diastolic dysfunction and the unexplained pulmonary hypertension in HD patients.

CERMEP-IDB-MRXFDG: a database of 37 normal adult human brain [18F]FDG PET, T1 and FLAIR MRI, and CT images available for research

We present a database of cerebral PET FDG and anatomical MRI for 37 normal adult human subjects (CERMEP-IDB-MRXFDG). Thirty-nine participants underwent static [18F]FDG PET/CT and MRI, resulting in [18F]FDG PET, T1 MPRAGE MRI, FLAIR MRI, and CT images. Two participants were excluded after visual quality control. We describe the acquisition parameters, the image processing pipeline and provide participants’ individual demographics (mean age 38 ± 11.5 years, range 23–65, 20 women). Volumetric analysis of the 37 T1 MRIs showed results in line with the literature. A leave-one-out assessment of the 37 FDG images using Statistical Parametric Mapping (SPM) yielded a low number of false positives after exclusion of artefacts. The database is stored in three different formats, following the BIDS common specification: (1) DICOM (data not processed), (2) NIFTI (multimodal images coregistered to PET subject space), (3) NIFTI normalized (images normalized to MNI space). Bona fide researchers can request access to the database via a short form.