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Biomedical subjects

J Teller

Publications and source records attributed to J Teller.

At least 19 recordsLinked to original sources
PubMed2000

Continuous monitoring of liver oxygenation with near infrared spectroscopy during naso-gastric tube feeding in neonates.

Near infrared spectroscopy (NIRS) is a non-invasive method of estimating the haemoglobin concentration changes in certain tissues. It is frequently used to monitor oxygenation of the brain in neonates. At present it is not clear whether near infrared spectroscopy of other organs (e.g. the liver as a corresponding site in the splanchnic region, which reacts very sensitively to haemodynamic instability) provides reliable values on their tissue oxygenation. The aim of the study was to test near infrared spectroscopy by measuring known physiologic changes in tissue oxygenation of the liver in newborn infants during and after feeding via a naso-gastric tube. The test-retest variability of such measurements was also determined. On 28 occasions in 25 infants we measured the tissue oxygenation index (TOI) of the liver and the brain continuously before, during and 30 minutes after feeding via a gastric tube. Simultaneously we measured arterial oxygen saturation (SaO2), heart rate (HR) and mean arterial blood pressure (MAP). In 10 other newborn infants we performed a test-retest analysis of the liver tissue oxygenation index to estimate the variability in repeated intra-individual measurements. The tissue oxygenation index of the liver increased significantly from 56.7 +/- 7.5% before to 60.3 +/- 5.6% after feeding (p < 0.005), and remained unchanged for the next 30 minutes. The tissue oxygenation index of the brain (62.1 +/- 9.7%), SaO2 (94.4 +/- 7.1%), heart rate (145 +/- 17.3 min-1) and mean arterial blood pressure (52.8 +/- 10.2 mm Hg) did not change significantly. The test-retest variability for intra-individual measurements was 2.7 +/- 2.1%. After bolus feeding the tissue oxygenation index of the liver increased as expected. This indicates that near infrared spectroscopy is suitable for monitoring changes in tissue oxygenation of the liver in newborn infants.

Blood Pressure↗
PubMed2000

Can near infrared spectroscopy of the liver monitor tissue oxygenation?

Measurement of the hepatic oxygenation index by near infrared spectroscopy is a suitable method to estimate the oxygenation and can be a non-invasive means to continuously monitor tissue perfusion and to detect early haemodynamic disturbances in critically ill children.

Child, Preschool↗
PubMed1999

Biocompatible magnetic polymer carriers for in vivo radionuclide delivery.

The magnetic guidance of antiplastic and antibacterial agents as well as x-ray and MRI contrast substances in vivo by means of magnetic particles has been attempted repeatedly during the last 2 decades with more or less success. When using microparticles, the circulation time in the blood, the biodistribution, and to a greater or lesser extent, the specific targeting are determined by the uniformity of size, chemical composition, surface modification, and the electric surface charge. The electrophoretic mobility is an important parameter for the prediction of the usefulness of the prepared particle, modified by chemical and biological molecules. For its success, radionuclide therapy depends on the critical relationship between the amount of radioactive isotopes in the target tissue and in critical normal tissue. Because the implementation of radioimmunotherapy for the treatment of cancer has proven to be considerably more difficult than initially anticipated, we propose the use of magnetic nanospheres for the well directed delivery of radionuclides to a tumor after the intravenous administration of the biodegradable colloidal suspension.

Biocompatible Materials↗
PubMed1997

Nebulization of a bovine surfactant in cystic fibrosis: a pilot study.

Cystic fibrosis (CF) is a lethal disorder which results in excessive airway secretions and in chronic inflammation of the airways. In vitro and in vivo studies have shown that a lack of surfactant results in the closure of the small airways. In this pilot study, we aimed to determine whether surfactant administered by aerosol might improve lung function on a short-term basis in patients with CF. In a randomized, crossover double-blind pilot study, 120 mg of a lipid-extracted bovine surfactant (Alveofact) or placebo was aerosolized to five young adult patients with CF over a period of 30 min for five consecutive days. The sample size had the power of 90% to detect an increase in forced expiratory volume in one second (FEV1) of 15% (p < 0.05). Jet nebulization of surfactant produced particles of which more than 75% were the respirable range (< 5 microns). The inhalations were well tolerated. No changes in serum antibody titres against the surfactant proteins-B and -C (SP-B/SP-C) were observed. No differences in FEV1 and forced vital capacity were found before, and 30 or 90 min after, the inhalation. This pilot study shows no acute or short-term benefits of surfactant inhalation in young adults with cystic fibrosis. However, a beneficial effect of exogenous surfactant cannot be excluded before other reasons for a lack of effect, such as insufficient quantity delivered, inhomogeneous distribution or inhibition of the surfactant in the lungs, have been completely ruled out.

Administration, Inhalation↗
PubMed1991

Effect of I-Scrub on signs and symptoms of chronic blepharitis.

To assess the effect of I-Scrub (Spectra Pharmaceutical Services), a new detergent eyelid scrub, on the subjective symptoms and objective clinical signs of chronic blepharitis, 20 patients with this disease were treated for three weeks. None of them yielded positive cultures for virulent bacteria from the eyelids and conjunctiva. Most of the patients reported significant reduction in the subjective symptoms and in the severity of the clinical signs as well. No adverse effects were observed. The results of our study suggest that this product is of value as a detergent eyelid scrub in the treatment of chronic blepharitis.

Aged↗
PubMed1990

[Ocular injuries from seashore racketball].

A 3-year prospective study revealed 39 hospitalized cases of ocular injuries from seashore racketball sports. Most were children and young adults and most had internal injuries of the globe. Over a third had retinal edema, 2 eyes were blinded, and at least 4 are subject to serious future complications.

Adult↗
PubMed1990

Eye injuries in children in Israel. A nationwide collaborative study.

A nationwide prospective collaborative study on ocular trauma was performed in Israel during a period of 3 years (1981 through 1983). Almost half of the traumas (1127 [47%] of 2416 eyes) were sustained by children younger than age 17 years, and mainly between the ages of 6 and 12 years. Most of the injuries happened at home (38.1%) or in the street (26.8%) and during play and sport (65.1%). The male-to-female ratio among the children was 4:1. Blunt injuries accounted for 59.2%; 30.5% were perforating injuries and the rest were chemical and radiation injuries. The visual acuity at the time of hospital discharge was better than 6/30 in the majority of the eyes but 122 patients (11%) had a visual acuity of less than 6/60, and no light perception was the result in 40 eyes (3%). The reasons for the severe outcome were as follows: 23 eyes (2%) owing to phthisis, 22 eyes (1.9%) were enucleated, and 16 eyes (1.4%) suffered from endophthalmitis.

Adolescent↗
PubMed1989

Accommodation insufficiency induced by glybenclamide.

We present a case of acute accommodation insufficiency after oral ingestion of glybenclamide. The symptom diminished after the drug was discontinued. Such an adverse effect has been described in association with other drugs but previously not with hypoglycemic agents.

Accommodation, Ocular↗
PubMed1989

Endogenous candidal endophthalmitis.

The incidence of systemic mycotic infections, though formerly rare, has increased dramatically over the past two decades. Candida albicans has been recognized as the most common pathogen in endogenous fungal endophthalmitis. Accurate antemortem diagnosis of disseminated candidiasis is made, however, only in a few cases. Ocular findings may often provide the first definitive clue to an underlying mycotic infection. We present four cases of candidal endophthalmitis; in each the ophthalmologist played a major role in the early diagnosis of the underlying systemic infection, allowing specific therapeutic measures to be taken. We also discuss the common predisposing factors, ocular symptoms and findings, clinical course, and response to antifungal therapy.

Aged↗
PubMed1988

The Israeli Ocular Injuries Study. A nationwide collaborative study.

A nationwide study of patients hospitalized for ocular injuries was conducted in Israel during the years 1981 through 1983, with the participation of 17 ophthalmic departments. The study comprised 2276 patients (2416 eyes), 47% of whom were children. The male-female ratio was 4.3:1. Bilateral injuries occurred in 140 patients, with children sustaining the most severe injuries. Ocular injuries occurred most frequently at home, and children at play were most vulnerable. Most patients retained good vision, 3.7% lost vision totally, and 2% of the eyes had to be enucleated.

Adolescent↗
PubMed1988

Late results of surgery for congenital esotropia.

In a retrospective study we have evaluated the surgical outcome in 46 children with congenital esotropia who were followed up for at least two years. The results support the concept of early operation for congenital esotropia. Evaluation of the effect of simultaneous weakening of the inferior obliques proved statistically that this reduced the effect of recession-resection of the horizontal recti.

Child, Preschool↗
PubMed1988

Late results of surgery for congenital esotropia.

In a retrospective study we evaluated the surgical outcome in 46 children with congenital estropia who were followed up for at least two years. The results support the concept of early operation for congenital estropia. Evaluation of the effect of simultaneous weakening of the inferior obliques proved statistically that this reduced the effect of recession-resection of the horizontal recti.

Age Factors↗
PubMed1988

Long-term follow-up of traumatic unilateral superior oblique palsy.

Twenty-four cases of traumatic unilateral superior oblique palsy were followed-up during a mean period of 5.3 years. Hypertropia in the primary position and a positive Bielschowsky test were present in 100% of the cases, compensating head posture in 71%, and excyclotorsion in 25%. Six patients needed surgical correction; 18 were cured spontaneously during a mean period of 9.2 months.

Adolescent↗
PubMed1988

Ocular dimensions following cryotherapy for active stage of retinopathy of prematurity.

In a group of 21 premature children in which 4 to 10 years earlier 26 eyes with stage 4 of active retinopathy of prematurity (ROP) were treated by cryopexy on the avascular retina, and 15 fellow eyes with stage 2 of active ROP were not treated, comparative measurements of the central corneal thickness, anterior chamber depth and eye axial length were performed. Not significant statistical differences of these parameters were found between the cryotreated and untreated eyes. The axial length was correlated with the degree of myopia.

Anterior Chamber↗