Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
3.
J Electrocardiol ; 53: 89-94, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30716528

RESUMO

BACKGROUND: An easy-to-operate ECG recorder should be useful for newborn screening for heart conditions, by health care workers - or parents. We developed a one-piece electrode strip and a compact, 12­lead ECG recorder for newborns. METHOD: We enrolled 2582 newborns in a trial to assess abilities of parents to record a 12­lead ECG on their infants (2-4 weeks-old). Newborns were randomized to recordings by parents (1290) or our staff (1292 controls). Educational backgrounds of parents varied, including 64% with no more than a high school diploma. RESULTS: For newborns randomized to parent recorded ECGs, 94% of parents completed a 10-minute recording. However, 42.6% asked for verbal help, and 12.7% needed physical help. ECG quality was the same for recordings by parents versus staff. CONCLUSIONS: By use of a one-piece electrode strip and a compact recorder, 87% of parents recorded diagnostic quality ECGs on their newborn infants, with minimal assistance.


Assuntos
Arritmias Cardíacas/diagnóstico , Eletrocardiografia/instrumentação , Programas de Rastreamento/instrumentação , Pais , Eletrodos , Desenho de Equipamento , Feminino , Humanos , Recém-Nascido , Masculino , Miniaturização
4.
Electromagn Biol Med ; 36(1): 102-113, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-27399314

RESUMO

Some effects of low-intensity magnetic fields on the concentration of radicals and their influence on cellular functions are reviewed. These fields have been implicated as a potential modulator of radical recombination rates. Experimental evidence has revealed a tight coupling between cellular function and radical pair chemistry from signaling pathways to damaging oxidative processes. The effects of externally applied magnetic fields on biological systems have been extensively studied, and the observed effects lack sufficient mechanistic understanding. Radical pair chemistry offers a reasonable explanation for some of the molecular effects of low-intensity magnetic fields, and changes in radical concentrations have been observed to modulate specific cellular functions. Applied external magnetic fields have been shown to induce observable cellular changes such as both inhibiting and accelerating cell growth. These and other mechanisms, such as cell membrane potential modulation, are of great interest in cancer research due to the variations between healthy and deleterious cells. Radical concentrations demonstrate similar variations and are indicative of a possible causal relationship. Radicals, therefore, present a possible mechanism for the modulation of cellular functions such as growth or regression by means of applied external magnetic fields.


Assuntos
Células/citologia , Radicais Livres/metabolismo , Campos Magnéticos , Membrana Celular/metabolismo , Células/metabolismo , Humanos , Transdução de Sinais
5.
Opt Express ; 24(9): 9660-6, 2016 May 02.
Artigo em Inglês | MEDLINE | ID: mdl-27137579

RESUMO

A large extinction ratio optical shutter has been demonstrated using electrowetting liquids. The device is based on switching between a liquid-liquid interface curvature that produces total internal reflection and one that does not. The interface radius of curvature can be tuned continuously from 9 mm at 0 V to -45 mm at 26 V. Extinction ratios from 55.8 to 66.5 dB were measured. The device shows promise for ultracold chip-scale atomic clocks.

6.
Ann Intern Med ; 163(7): W141-5, 2015 10 06.
Artigo em Inglês | MEDLINE | ID: mdl-26436632
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...