Hearing and Sj?gren's syndrome

Immune sensorineural hearing loss is manifested in several systemic immune diseases. Although hearing loss has been previously documented in patients with Sj?gren's syndrome (SS), the effect of SS on hearing is unclear. This prospective study was designed to assess the presence of hearing loss in 14 patients with SS and, if sensorineural hearing loss was present, to determine if the hearing loss was immune-mediated. Patients were evaluated with basic audiologic tests as well as for cellular immune inner ear reactivity as measured by the lymphocyte transformation test (LTT). Three patients had evidence of sensorineural hearing loss. Two patients had a positive LTT without evidence of sensorineural hearing loss. This preliminary study suggests that SS may not directly cause sensorineural hearing loss, immuno-mediated or otherwise.     

Clinically significant hearing loss in renal allograft recipients treated with intravenous erythromycin

BACKGROUND: Hearing loss is generally regarded as a rare side effect of erythromycin therapy. However, our own clinical experiences in erythromycin-treated patients led us to suspect that this complication may be more common among renal allograft recipients. The purpose of this study was to evaluate the incidence, predisposing factors, clinical characteristics, and outcomes of erythromycin-induced hearing loss among renal allograft recipients. METHODS: We reviewed medical records of renal transplant patients treated for pneumonia with intravenous erythromycin lactobionate. Patients were evaluated for the occurrence of clinically significant hearing loss (including onset, duration, and reversibility), other signs and symptoms of ototoxicity (vertigo and tinnitus), daily erythromycin dose and duration of treatment, concurrent ototoxic drug therapy, renal and hepatic function, and history of previous otic disease. RESULTS: Eleven (32%) of 34 courses of intravenous erythromycin therapy resulted in hearing loss. The incidence of hearing loss was 53% (eight of 15 courses) in patients treated with 4 g of erythromycin daily compared with 16% (three of 19 courses) among those receiving 2 g/d (P = .05). In addition, courses of erythromycin were longer in those suffering auditory toxicity (9.6 +/- 4.7 days) than in nontoxic patients (5.7 +/- 3.6 days) (P < .05). Hepatic and renal function did not differ between toxic and nontoxic patients. All episodes of erythromycin-induced hearing loss were reversible. CONCLUSIONS: We conclude that clinically significant hearing loss occurs in more than 30% of renal allograft recipients treated for pneumonia with intravenous erythromycin lactobionate. Patients who require prolonged courses of erythromycin and those treated with 4 g/d are at particular risk for the development of auditory toxicity. With prompt recognition and modification of therapy, erythromycin-induced hearing loss appears to be completely reversible.     

Trenched‐Sinker LDMOSFET (TS‐LDMOS) Structure for 2 GHz Power Amplifiers

This paper proposes a new LDMOSFET structure with a trenched sinker for high‐power RF amplifiers. Using a low‐temperature, deep‐trench technology, we succeeded in drastically shrinking the sinker area to one‐third the size of the conventional diffusion‐type structure. The RF performance of the proposed device with a channel width of 5 mm showed a small signal gain of 16.5 dB and a maximum peak power of 32 dBm with a power‐added efficiency of 25% at 2 GHz. Furthermore, the trench sinker, which was applied to the guard ring to suppress coupling between inductors, showed an excellent blocking performance below ?40 dB at a frequency of up to 20 GHz. These results confirm that the proposed trenched sinker should be an effective technology both as a compact sinker for RF power devices and as a guard ring against coupling.     

Renal R2 chemoreceptor activity is attenuated after back heating in the rat

The aim of the present study was to determine the afferent connections of the nucleus accumbens in snakes, in particular its catecholaminergic input. For that purpose, in vitro and in vivo applications of retrograde tracers in the nucleus accumbens of Elaphe guttata were combined with tyrosine hydroxylase (TH) immunohistochemistry. Both techniques revealed telencephalic inputs to the nucleus accumbens originating from the diagonal band of Broca, ventral pallidum, amygdaloid complex, and dorsal cortex. Major diencephalic inputs arise from the dorsomedial thalamic nucleus and the hypothalamus. In the brainstem, a few retrogradely labeled cells were observed in the raphe nucleus and the locus coeruleus. Considerably more cells were found in the midbrain tegmentum. Within the confines of the locus coeruleus and, in particular, the midbrain tegmentum, retrogradely labeled cells stained also for TH suggesting that those areas constitute the major catecholaminergic input to the nucleus accumbens of snakes. The experimental approach used in the present study, in particular the in vitro technique, seems to be very suited for studying the development of basal ganglia organization of reptiles in the near future.