Modeling circuit mechanisms of opposing cortical responses to visual flow perturbations.

In an ever-changing visual world, animals' survival depends on their ability to perceive and respond to rapidly changing motion cues. The primary visual cortex (V1) is at the forefront of this sensory processing, orchestrating neural responses to perturbations in visual flow. However, the underlying neural mechanisms that lead to distinct cortical responses to such perturbations remain enigmatic. In this study, our objective was to uncover the neural dynamics that govern V1 neurons' responses to visual flow perturbations using a biologically realistic computational model. By subjecting the model to sudden changes in visual input, we observed opposing cortical responses in excitatory layer 2/3 (L2/3) neurons, namely, depolarizing and hyperpolarizing responses. We found that this segregation was primarily driven by the competition between external visual input and recurrent inhibition, particularly within L2/3 and L4. This division was not observed in excitatory L5/6 neurons, suggesting a more prominent role for inhibitory mechanisms in the visual processing of the upper cortical layers. Our findings share similarities with recent experimental studies focusing on the opposing influence of top-down and bottom-up inputs in the mouse primary visual cortex during visual flow perturbations.

Extended phenotype and clinical subgroups in unilateral Meniere disease: A cross-sectional study with cluster analysis.

OBJECTIVES: To define clinical subgroups by cluster analysis in patients with unilateral Meniere disease (MD) and to compare them with the clinical subgroups found in bilateral MD. DESIGN: A cross-sectional study with a two-step cluster analysis. SETTINGS: A tertiary referral multicenter study. PARTICIPANTS: Nine hundred and eighty-eight adult patients with unilateral MD. MAIN OUTCOME MEASURES: best predictors to define clinical subgroups with potential different aetiologies. RESULTS: We established five clusters in unilateral MD. Group 1 is the most frequently found, includes 53% of patients, and it is defined as the sporadic, classic MD without migraine and without autoimmune disorder (AD). Group 2 is found in 8% of patients, and it is defined by hearing loss, which antedates the vertigo episodes by months or years (delayed MD), without migraine or AD in most of cases. Group 3 involves 13% of patients, and it is considered familial MD, while group 4, which includes 15% of patients, is linked to the presence of migraine in all cases. Group 5 is found in 11% of patients and is defined by a comorbid AD. We found significant differences in the distribution of AD in clusters 3, 4 and 5 between patients with uni- and bilateral MD. CONCLUSIONS: Cluster analysis defines clinical subgroups in MD, and it extends the phenotype beyond audiovestibular symptoms. This classification will help to improve the phenotyping in MD and facilitate the selection of patients for randomised clinical trials.

Familial clustering and genetic heterogeneity in Meniere's disease.

The aims of this study were to estimate the prevalence of familial cases in patients with Meniere's disease (MD) and to identify clinical differences between sporadic and familial MD. We recruited 1375 patients with definite MD according to the American Academy of Otolaryngology-Head and Neck Surgery criteria, obtaining the familial history of hearing loss or episodic vertigo by direct interview or a postal survey in 1245 cases in a multicenter study. Familial clustering was estimated by the recurrence risk ratio in siblings (λs ) and offspring (λo ) using intermediate and high prevalence values for MD in European population. A total of 431 patients (34%) reported a familial history of hearing loss or recurrent vertigo and 133 patients had a relative with possible MD. After clinical reevaluation, 93 relatives in 76 families were diagnosed of definite MD (8.4%), including three pairs of monozygotic twins. λs and λo were 16-48 and 4-12, respectively. We observed genetic heterogeneity, but most families had an autosomal dominant inheritance with anticipation. No clinical differences were found between sporadic and familial MD, except for an early onset in familial cases. We may conclude that MD has a strong familial aggregation and that sporadic and familial MDs are clinically identical.

Relationship of Frailty, Nutritional Status and Oral Health-Related Quality of Life in Mexico City Nursing Home Residents.

BACKGROUND: We aimed to identify the association among nutritional status, Oral Health-Related Quality of Life (OHRQoL) and frailty, and to estimate the mediation effect of these conditions between age and frailty in a group of Mexico City nursing home residents. METHODS: We conducted a cross-sectional study. Fried's phenotype criteria, Full Mini Nutritional Assessment, and General Oral Health Assessment Index was applied. RESULTS: The participants (n = 286) mean age was 82.4 (± 9.2) years. The prevalence of frailty was 58%, and the prevalence of malnutrition and the risk of malnutrition were 22.7% and 59.5%, respectively. A higher risk of frailty was associated with older age (p = 0.015), sex (women) (p = 0.041), poor nutritional status (p <0.001) and compromised OHRQoL (p <0.001). Approximately 40% of the effect of age on frailty was mediated by nutritional status and OHRQoL (p <0.05). CONCLUSION: A strong association between nutritional status and frailty was observed. Additionally, OHRQoL was associated with frailty. The effect of age on frailty was mediated by OHRQoL and nutritional status. Interventions targeted to improve nutritional status and oral health may contribute to preventing or delaying the onset of frailty.

Determining triple gauge boson couplings from Higgs data.

In the framework of effective Lagrangians with the SU(2)(L)×U(1)(Y) symmetry linearly realized, modifications of the couplings of the Higgs field to the electroweak gauge bosons are related to anomalous triple gauge couplings (TGCs). Here, we show that the analysis of the latest Higgs boson production data at the LHC and Tevatron give rise to strong bounds on TGCs that are complementary to those from direct TGC analysis. We present the constraints on TGCs obtained by combining all available data on direct TGC studies and on Higgs production analysis.

[Labor pain worries future fathers more than the mothers]. / El dolor del parto preocupa más a los futuros padres que a las madres.

OBJECTIVE: To evaluate the concerns of the future father about labor pain and another 9 items which could be important to the well-being of the mother during delivery. To investigate any possible differences in opinion between the future father and mother. PATIENTS AND METHODS: An anonymous and voluntary questionnaire was offered to the father and the pregnant patient during the last month of pregnancy. They had to answer the questionnaire separately, scoring 10 items in a 0-10 point ordinal scale, according to their concerns and the importance for the good development of the delivery (0= not concerned about/insignificant to 10=concerned about/great importance). The items included were: 1) esthetic aftermath, 2) embarassment, 3) continous information, 4) walking during labor, 5) drinking during labor, 6) companionship, 7) labor pain, 8) keeping composure, 9) kindness, 10) room comfortability. Data on age, education, parity and nationality were recorded. RESULTS: A total of 147 questionnaires were completed, 99 by mothers, and 48 by fathers. Pain was the most important concern for the future fathers scoring a mean (SD) of 8.15 (2), while continuous information 7.71 (2.5), kindness 7.9 (2.1), and companionship 8.21 (2.3) were more important than pain for mothers. A statistically significant difference was found between fathers and mothers regarding labor pain (P=.001), walking during labor (P=.003), and drinking during labor (P=.009). CONCLUSIONS: The result of our study suggests that increasing the presence of the father during the delivery process, and taking care of the emotional aspects and the quality of the information given could be very important for the perception of satisfaction.

100 Years since Robert Barany's visit to the Zaragoza medical faculty.

In December 1923, a twelve-day course took place at the University of Zaragoza, specifically at the Faculty of Medicine, given by Professor Róbert Bárány, who was awarded the Nobel Prize for Medicine in 1914 for his discoveries on the vestibular apparatus.Professor Robert Bárány came to the faculty at the invitation of Professor Victor Fairén through the University Exchange programme. This course consisted of four lectures and twelve lessons a day in which he presented his knowledge of the physiopathology of the vestibule and cerebellum, as well as practical demonstrations of the physical examination of nystagmus and cerebellar pathology.Lorente de Nó, a doctorate student of medicine, was one of the most outstanding students on the course. His intellect was already outstanding in those years, which helped him to discuss the physiopathology of nystagmus with Professor Bárány. The relationship he forged with the Nobel laureate in Zaragoza would be decisive for his future as a researcher.The aim of this work is to compile and integrate the available information on the course that Professor Bárány took in the city of Zaragoza, consulting official documents from the university and the city, articles, books and the press of the time.

Association between superior semicircular canal dehiscence and other dehiscences in temporal bone.

BACKGROUND: The study of the association between superior semicircular canal and other dehiscences in the temporal bone. MATERIALS AND METHODS: We have studied computed tomography of radiologically diagnosed people with superior or posterior semicircular canal dehiscences, in four health centres. In addition, we have studied one isolated human temporal bone, one skull and one cadaver head belonging to the collection of the Department of Human Anatomy and Histology of the University of Zaragoza that had dehiscence in the superior semicircular canal. RESULTS: The most frequent association that we observed was between superior semicircular canal dehiscence and tegmen tympani dehiscence (37.33%). Three cases (two clinical cases and one isolated temporal bone) showed multiple associated dehiscences (tegmen tympani, mastoid antrum, posterior semicircular canal, internal auditory canal, glenoid cavity, tympanum bone and geniculate ganglion) associated with superior semicircular canal dehiscence. CONCLUSIONS: When the superior semicircular canal dehiscence is associated to other in the petrous bone (tegmen tympani, mastoid antrum, posterior semicircular canal, internal auditory canal) could be grouped into the same syndrome called "otic capsule syndrome", since they have the same origin and common aetiology (otic capsule).

Brimonidine-LAPONITE® intravitreal formulation has an ocular hypotensive and neuroprotective effect throughout 6 months of follow-up in a glaucoma animal model.

Intravitreal administration is widely used in ophthalmological practice to maintain therapeutic drug levels near the neuroretina and because drug delivery systems are necessary to avoid reinjections and sight-threatening side effects. However, currently there is no intravitreal treatment for glaucoma. The brimonidine-LAPONITE® formulation was created with the aim of treating glaucoma for extended periods with a single intravitreal injection. Glaucoma was induced by producing ocular hypertension in two rat cohorts: [BRI-LAP] and [non-bri], with and without treatment, respectively. Eyes treated with brimonidine-LAPONITE® showed lower ocular pressure levels up to week 8 (p < 0.001), functional neuroprotection explored by scotopic and photopic negative response electroretinography (p = 0.042), and structural protection of the retina, retinal nerve fibre layer and ganglion cell layer (p = 0.038), especially on the superior-inferior axis explored by optical coherence tomography, which was corroborated by a higher retinal ganglion cell count (p = 0.040) using immunohistochemistry (Brn3a antibody) up to the end of the study (week 24). Furthermore, delayed neuroprotection was detected in the contralateral eye. Brimonidine was detected in treated rat eyes for up to 6 months. Brimonidine-LAPONITE® seems to be a potential sustained-delivery intravitreal drug for glaucoma treatment.

Neurological evaluation of patients with Gaucher disease diagnosed as type 1.

Type 1 Gaucher disease (GD1) is characterised by lack of central nervous system involvement; however, there are several reports of associated neurological manifestations. The aim of this study was to systematically evaluate neurological manifestations in 31 patients with GD1 (12 males and 19 females; mean age 39.4 (range 5-77) years). Participants underwent a complete neurological examination and cognitive tests. Investigation of symptoms and medication intake, and motor and sensory electroneurograms were obtained. 30.7% of adult patients had neurological deficits, including psychomotor delay, parkinsonism, dementia, impaired saccadic ocular movements and peripheral nerve dysfunction. Three patients were redefined as type 3 GD. Electrodiagnosis was performed on 15 patients; 26.7% had reduced amplitude and/or abnormal waveforms in at least three nerves, 33.3% had a mild reduction in amplitude of two nerves and 40% had amplitude reduction in one nerve. Patients with three or more affected nerves had additional neurological symptoms. Our results demonstrate that neurological alterations occur in patients diagnosed with GD1, and subclinical peripheral neuropathy is a frequent finding.

[New anaesthetic technique in diode laser treatment of retinopathy of prematurity]. / Nueva técnica anestésica en el tratamiento con láser diodo de la retinopatía del prematuro.

INTRODUCTION: Anaesthesia in premature infants can have many complications. Although the application of diode laser is less painful than cryotherapy, there has to be adequate immobilization of the patient to provide a correct focus of the spot. At Hospital Infantil de Zaragoza, the same standard anaesthetic technique has been applied since 1999, obtaining sedation with inhaled anaesthetic agents combined with topical anaesthesia. We analyse the results obtained on the application of this technique. MATERIAL AND METHOD: The study included 72 consecutive premature infants treated with diode laser for retinopathy of prematurity (ROP), using an anaesthetic technique combining inhalatory sedation and topical anaesthesia. The personal data of each patient was collected (gestational age, birth weight, postconceptional age at the time of initial treatment, associated systemic disorders) together with information related to the surgical intervention (duration, intraoperative and postoperative complications). RESULTS: Intraoperative complications occurred in 12 cases (16.66%). These were self-limited in 9 cases and only 3 cases required orotracheal intubation (4.16%). Postoperative complications occurred in 4 cases (5.55%) during the 48 h following treatment. No statistically significant relationship was found between the presence of intraoperative complications and the mean gestational age and birth weight, and the presence of apnoea, intraventricular haemorrhage or a permeable ductus. A statistically significant relationship was found between the presence of postoperative complications and significant intraventricular haemorrhage. CONCLUSIONS: This anaesthetic technique combining inhalatory gases and topical anaesthesia is safe, with few complications and comfortable for the surgeon.

Unexpected obstetric haemorrhage. Krukenberg tumour. / Hemorragia obstétrica de causa inesperada. Tumor de Krukenberg.

Obstetric haemorrhage can endanger the lives of mother and foetus. It often occurs unexpectedly without clear predictors. A high degree of suspicion helps to avoid delaying resuscitation measures. We present the case of a ruptured ovarian metastasis that occurred during labour. It caused a massive bleed forcing a caesarean section due to non-reassuring foetal status. This was an unprecedented and undescribed onset of Krukenberg tumour formation. Malignant tumours in pregnancy are rare and difficult to diagnose due to their clinical manifestations which often overlap with those of pregnancy itself (dyspepsia, nausea and bloating). Despite the available therapeutic measures, a delay in diagnosis is a determining factor for long-term prognosis. We review the causes of obstetric bleeding, and underline how rare Krukenberg tumours concomitant to pregnancy are.

Prosthetic valve endocarditis caused by Brucella melitensis. A report of four cases successfully treated with tetracycline, streptomycin, and sulfamethoxazole and trimethoprim plus valve replacement.

Optimal treatment of prosthetic valve endocarditis due to Brucella melitensis is unknown. The presence of ring abscess makes extensive surgical débridement and valve replacement essential steps of management. Antimicrobial therapy with tetracycline hydrochloride plus streptomycin sulfate or sulfamethoxazole and trimethoprim can achieve the sterilization of infected cardiac tissue. Late bland periprosthetic leaks occur frequently. Reoperation can be safely performed after a period of antimicrobial therapy. Prolonged treatment with doxycycline hyclate seems advisable.

[Dual atrioventricular nodal conduction and arrhythmia with severe hemodynamic alterations during liver retransplantation]. / Arritmia por doble via intranodal con descompensación hemodinámica grave en un retrasplante hepático.

We report the case of a man who developed tachycardia caused by atrioventricular reentry related to dual nodal conduction during liver retransplantation. The hemodynamic alterations were severe. Arrhythmia and altered cardiac conduction are potential complications of liver transplantation. The development of tachyarrhythmias--atrial fibrillation as well as episodes of supraventricular and ventricular tachycardia and bradycardia--have been described. Such arrhythmias tend to occur particularly during reperfusion of the graft. Risk factors implicated are the severe ion imbalances, acid-base imbalance, and hypothermia that accompany the reperfusion of a new organ. A review of the possible pathogenic and etiological mechanisms that lead to arrhythmia in patients with end-stage liver disease is provided.

Long-term comparative analysis of the Björk-Shiley and Hancock valves implanted in 1975.

The long-term results in all patients undergoing isolated mitral, aortic, or double mitral-aortic heart valve replacement operated upon in 1975 has been retrospectively analyzed. A total of 153 patients received the standard Björk-Shiley (flat pyrolytic disc) mechanical prostheses and 150 patients received the noncomposite Hancock porcine xenograft. Overall operative mortality was not significantly different between groups. All patients receiving a Björk-Shiley prosthesis, but none in the Hancock group, received long-term anticoagulant therapy. Medium and long-term actuarial survival rates (5 and 10 years postoperatively) were comparable for the two groups (88% for Björk-Shiley and 84% for Hancock [NS] at 5 years; 86% for Björk-Shiley and 80% for Hancock at 10 years [NS]). The incidence of systemic embolism was similar in the two groups (1.6% +/- 0.4% per patient-year for the Björk-Shiley group and 1.3% +/- 0.3% per patient-year for the Hancock group [NS]). Also the incidence of endocarditis was similar (0.6% +/- 0.2% per patient-year for the Björk-Shiley group and 0.8% +/- 0.3% per patient-year for the Hancock group [NS]). In the Hancock group the overall incidence of reoperations was significantly higher than in the Björk-Shiley group (4.2% +/- 0.6% per patient-year versus 0.9% +/- 0.3% per patient-year (p = 0.001). The major cause for reoperation in the Hancock group was primary tissue failure (3% +/- 0.5% per patient-year). In the Björk-Shiley group the major cause of reoperation was valve thrombosis (0.5% +/- 0.2% per patient-year). Therefore, accepting the fact that other bioprostheses may behave differently from the Hancock noncomposite xenograft, we currently restrict our indications for valve replacement with bioprostheses.

Comparative clinical results with Omniscience (STM1), Medtronic-Hall, and Björk-Shiley convexo-concave (70 degrees) prostheses in mitral valve replacement.

The intermediate clinical results of 289 patients undergoing isolated mitral valve replacement with three different low-profile mechanical prostheses have been retrospectively analyzed and compared. Between June, 1980, and September, 1983, 70 patients received the Omniscience prosthesis, 159 patients the Medtronic-Hall valve, and 60 patients the convexo-concave 70 degree Björk-Shiley prosthesis. Hospital mortality was 15% for the Björk-Shiley group, 4.4% for the Medtronic-Hall group, and 7.1% for the Omniscience group. Cumulative follow-up was 88 years (mean 1.7 years) for the Björk-Shiley, 229 years (mean 1.5 years) for the Medtronic-Hall, and 223 years (mean 3.3 years) for the Omniscience group. All patients were placed on a program of anticoagulant therapy (dicumarol) postoperatively. Actuarial survival rates (+/-SE) 2 years postoperatively were comparable for the three groups: Björk-Shiley, 90% +/- 4.7%; Medtronic-Hall, 93% +/- 2.2%; and Omniscience, 88% +/- 4.1% (p = NS). Late mortality, expressed at linearized rates (percent patient-year +/-SE), was 3.4% +/- 1.9% for the Björk-Shiley group, 1.7% +/- 0.8% for the Medtronic-Hall group, and 3.6% +/- 1.2% for the Omniscience group (p = NS). Actuarially determined rates of freedom from thromboembolic complications (systemic embolism and valvular thrombosis) 2 years postoperatively were 97% +/- 2.2% for the Björk-Shiley group, 94% +/- 2.1% for the Medtronic-Hall, and 84% +/- 4.7% for the Omniscience group (p = 0.05, Omniscience versus Medtronic-Hall; p = 0.02, Omniscience versus Björk-Shiley) The actuarial probability of being free from reoperation 2 years postoperatively was 92 +/- 3.5 for the Björk-Shiley group, 92 +/- 2.9 for the Medtronic-Hall group, and 82 +/- 3.9 for the Omniscience group (p = 0.04). The major cause for reoperation in the Omniscience group was valve thrombosis (seven patients), yielding a linearized incidence (+/-SE) of 3.1 +/- 1.1 (p = 0.01). No statistically significant differences were obtained regarding the incidence of prosthetic infective endocarditis or perivalvular leak. Overall rates of anticoagulant-related hemorrhage were comparable for the three groups.

Results and complications with the Omniscience prosthesis.

A clinical trial with the Omniscience heart valve was conducted from June, 1980, until May, 1981. In this period 166 patients underwent heart valve replacement: mitral valve replacement (MVR) 70 patients, aortic valve replacement (AVR) 37, and combined mitral-aortic valve replacement (M/AVR) 59 patients. There were 20 hospital deaths, for a mortality of 12%. Total follow-up was 226 patient-years (range 6 to 28 months, mean 18 months). There were eight late deaths (MVR 4.6%, AVR 3.1%, and M/AVR 8.1%). All patients were taking oral anticoagulants. The incidence of valve-related complications (expressed as events per 100 patient-years) was as follows: Systemic embolism--MVR 2, AVR 4.7, and M/AVR 2.5; and anticoagulant complications--MVR 1.9, AVR 2.3, and M/AVR 0. The incidence of valvular dysfunction (expressed as events per 100 patient-years) was as follows: valvular thrombosis--MVR 4.8, AVR 0, and M/AVR 1.2; perivalvular leakage--MVR 1.9, AVR 2.3, and M/AVR 2.5; and infective endocarditis--MVR 0.96, AVR 0, and M/AVR 1.2. The actuarial probability of being free of valvular dysfunction 30 months postoperatively is 73% for the MVR group, 90% for the AVR group, and 71% for the M/AVR group. Despite a short follow-up, the incidence of valvular dysfunction has been significant. For this reason, we have discontinued using these prostheses for heart valve replacement.

Reoperations for left-sided low-profile mechanical prosthetic obstructions.

A series of 2,474 hospital survivors of primary mitral, aortic, and double mitral-aortic valve replacement were observed for a cumulative period of 11.945 years (mean, 4.2 years; range, 0.6-14 years). The linearized incidences of reoperations for thrombotic obstructions were 0.33 +/- 0.08% for mitral valve replacement, 0.36 +/- 0.1% for aortic valve replacement, and 0.42 +/- 0.1% for double valve replacement (p = not significant). Forty-one patients (16 mitral, 12 aortic, and 13 double valve replacements) underwent a total of 44 reoperations with a mean interval of 36 +/- 29 months (range, 0.25-85 months) between operations. Diagnosis was established invasively only in 13 patients (30%). Hospital mortality at reoperation was 18% (8 patients); 28 patients (63%) required emergency surgery. The choice surgical procedures were thrombectomy for clotted aortic prostheses (18 of 24) and valve replacement for obstructed mitral valves (22 of 25; p less than .001). Rethrombosis occurred in 3 patients (1 aortic and 2 double valve replacements). At hospital admission 17 patients (38%) had prothrombin times outside therapeutic ranges (between 20 to 30% of the normal value). The incidence of reoperations for thrombosis in low-profile mechanical prostheses was unaffected by valvar position and number of prostheses implanted. Rethrombosis occurred only in previously cleaned valves, although its occurrence was not significant. The present results indicate that, as experience is gained in the diagnosis and surgical management of this complication, hospital mortality can be reduced significantly (from 37% to 4%).

Enteral nutrition by percutaneous endoscopic gastrojejunostomy in severe hyperemesis gravidarum: a report of two cases.

We describe the first two cases in which percutaneous endoscopic gastrojejunostomy was used as a means to provide enteral nutrition in severe hypermesis gravidarum. The use of this method of enteral access provided an alternative to parenteral nutrition, was well tolerated, cost-effective and had no major complications. In both cases the nutritional goal for mothers as well as appropriate fetal growth and development were achieved.