RESUMEN
Oxygen tensions of 50 simultaneously withdrawn blood samples from the right atrial orifice of a triple-lumen pulmonary artery catheter and from the pulmonary artery lumen were compared. Mixed venous oxygen tensions ranged from 21 mmHg to 44.9 mmHg. The correlation coefficient was 0.96 (t = 2.09; P = 0.01). The benefits and drawbacks of intermittent right atrial oxygen tension monitoring are discussed.
Asunto(s)
Oxígeno/sangre , Cateterismo Cardíaco , Atrios Cardíacos , Humanos , Presión Parcial , Arteria PulmonarAsunto(s)
Cuidados Preoperatorios/métodos , Humanos , Servicio Ambulatorio en Hospital , Riesgo , SudáfricaRESUMEN
Long-term (greater than 48 h) sodium nitroprusside (SNP) infusion significantly reduced cobalamin (vitamin B12) levels in 23 patients treated in a CCU after myocardial infarction. There was no evidence of vitamin B12 deficiency or SNP toxicity. Low vitamin B12 levels should not limit the use of SNP, because prolonged infusion of SNP at maximum doses of 2.5 micrograms/kg X min did not adversely affect hemodynamic stability.