RESUMEN
BACKGROUND: Very low birth weight (VLBW) infants (weight <1500 g) are increasingly cared for without prolonged periods of positive pressure ventilation (PPV). AIMS: To develop a system for 3.0 T magnetic resonance (MR) image acquisition from VLBW infants who are not receiving PPV, and to test the clinical stability of a consecutive cohort of such infants. DESIGN: Seventy VLBW infants whose median weight at image acquisition was 940 g (590-1490) underwent brain MR imaging with the developed care system as participants in research. Twenty infants (29%) received nasal continuous positive airway pressure (nCPAP), 28 (40%) received supplemental oxygen by nasal cannulae, and 22 (31%) breathed spontaneously in air during the MR examination. RESULTS: There were no significant adverse events. Seventy-six percent had none or transient self-correcting oxygen desaturations. Desaturations that required interruption of the scan for assessment were less common among infants receiving nCPAP (2/20) or breathing spontaneously in air (2/22), compared with those receiving nasal cannulae oxygen (13/28), p=0.003. Sixty-four (91%) infants had an axillary temperature > or =36 degrees C at completion of the scan (lowest 35.7 degrees C), There was no relationship between weight (p=0.167) or use of nCPAP (p=0.453) and axillary temperature <36 degrees C. No infant became hyperthermic. CONCLUSION: VLBW infants who do not require ventilation by endotracheal tube can be imaged successfully and safely at 3.0 T, including those receiving nCPAP from a customised system.
Asunto(s)
Recién Nacido de muy Bajo Peso , Imagen por Resonancia Magnética/métodos , Atención Dirigida al Paciente/métodos , Peso al Nacer/fisiología , Continuidad de la Atención al Paciente , Humanos , Recién Nacido , Recien Nacido Prematuro/fisiología , Cuidado Intensivo Neonatal/métodos , Intubación Intratraqueal , Imagen por Resonancia Magnética/efectos adversos , Imagen por Resonancia Magnética/instrumentación , Terapia por Inhalación de Oxígeno/métodos , Grupo de Atención al Paciente/organización & administración , Posicionamiento del Paciente/métodos , Respiración con Presión Positiva/métodos , SeguridadRESUMEN
A coil tuned to 21.3 MHz was incorporated into a nasogastric tube and used as a marker of tube position during magnetic resonance (MR) imaging in a 0.5-T scanner. Catheter tracking was investigated with the coil used in both transmit/receive and in receive-only modes. Data acquired from this coil were overlaid on images obtained using the body coil of the scanner. Visualization of the full length of the catheter with local high signal at the tip was achieved with a temporal resolution of approximately 1 second. J. Magn. Reson. Imaging 2001;13:127-130.
Asunto(s)
Intubación Gastrointestinal/instrumentación , Imagen por Resonancia Magnética/instrumentación , Diseño de Equipo , Humanos , Imagen por Resonancia Magnética/métodos , Radiología Intervencionista/instrumentaciónRESUMEN
An RF coil, made by twisting a conventional wire loop, was tuned to form an extended sensor to provide an effective method of showing the track of a catheter. A twisted-pair coil can be made small enough in diameter to pass through needles in common clinical use. The coil has a very small field of view and in transmit/receive operation has minimal effect on the magnetization of the surrounding tissue.
