Arrhythmias correlate with disorders of either K(2+) channels in sarcolemma or calcium modulating system in sarcoplasmic reticulum which handles Ca(2+) intracellularly. We hypothesized that an activated endothelin (ET) signaling pathway, which may be associated with an alteration of K(+) channels and Ca(2+) uptake activity in the myocardium, participated in the exaggerated ventricular fibrillat...

Using the simple method of protein analysis described here, we could identify thyroxin (T4)-binding-protein abnormalities in euthyroid patients with hyperthyroxinemia or hypothyroxinemia. Serum incubated with [125I]thyroxin was analyzed by agarose gel electrophoresis, with bromphenol blue staining of protein. The relative distribution of radioactive T4 was determined for each binding protein--t...

In a previous study of a representative population of 460 men of age 70, we found that the free thyroxin (free T4) concentration was negatively correlated to body mass. In the present study we analyzed other indicators of thyroid function in relation to body mass and body mass index in 181 individuals without any disease or medication influencing thyroidal homeostasis or body mass. There was a ...

BACKGROUND The IFCC Committee for Standardization of Thyroid Function Tests aims at equivalence of laboratory test results for free thyroxine (FT4) and thyrotropin (TSH). OBJECTIVES This report describes the phase III method comparison study with clinical samples representing a broad spectrum of thyroid disease. The objective was to expand the feasibility work and explore the impact of standa...

We studied 145 clinically euthyroid patients on maintenance methadone therapy for narcotic withdrawal, to characterize abnormalities in thyroid-function tests induced by methadone. About a third had increased total thyroxin (T4) and total triiodothyronine (T3) concentrations in serum. The mean concentrations of T3, T4, and thyroxin-binding globulin (TBG) in serum were significantly greater (P l...

There is a controversy among different scientific societies in relation to the recommendations on whether universal screening for the detection of thyroid dysfunction during gestation should be performed or not. Although various studies have shown an association between subclinical hypothyroidism or hypothyroxinemia with obstetric problems and/or neurocognitive impairment in the offspring, no e...

OBJECTIVE To study the effect of induced hypothyroidism and thyroxin replacement on bone growth. DESIGN An animal study carried out on experimental Albino rats. PLACE AND DURATION OF STUDY The study was carried out in the Department of Anatomy, Basic Medical Sciences Institute (BMSI), Jinnah Postgraduate Medical Centre (JPMC), Karachi, from June 1999 to May 2002. METHOD Pregnant female Al...

Repeated observations within recent years have shown that the oral administration of iodine will usually be followed by a striking reduction in the basal metabolism in patients with exophthalmic goiter. A histologic study of the thyroid glands which have been removed from these patients gives evidence that definite involutional changes follow the use of iodine which indicate an anatomic regress...