Critical care medicine
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Critical care medicine · Nov 1994
Randomized Controlled Trial Comparative Study Clinical TrialPreservation of humidity and heat of respiratory gases in patients with a minute ventilation greater than 10 L/min.
To compare the temperature and humidification output of one heated humidifier system (Bennett Cascade 2 Humidifier) and two heat and moisture exchangers (Pall Ultipor, BB 50, and Humid-Vent Filter) in intensive care unit (ICU) patients submitted to a minute ventilation of > 10 L/min. ⋯ In patients with a minute ventilation of > 10 L/min (> 10.5 to 16.0 L/min), the Humid-Vent Filter had a temperature and humidification output close to the reference system (the Bennett Cascade 2 Humidifier). The Pall Ultipor Filter had a significantly lower temperature and humidification output in these patients.
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Critical care medicine · Nov 1994
Comparative StudyUse of pediatric physician extenders in pediatric and neonatal intensive care units.
To determine present and future use of pediatric physician extenders in neonatal and pediatric intensive care units (ICUs). ⋯ Pediatric physician extenders are extensively employed in pediatric and neonatal ICUs. They are perceived to perform at the level of second-year pediatric residents and are strongly supported by staff physicians and residents. It appears that more pediatric physician extenders will be employed in pediatric and neonatal ICUs in the future.
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Critical care medicine · Nov 1994
Comparative StudyRelationship between hemodynamic changes and blood hormone concentrations after cardiac surgery in children with congenital heart disease.
To evaluate changes in atrial natriuretic factor in relation to modifications in hemodynamic variables, and to evaluate hormones determining salt and water metabolism after heart surgery in children with congenital heart disease. ⋯ Patients with congenital heart disease have increased plasma concentrations of atrial natriuretic factor. During the early postoperative period, in patients with a more severe degree of congenital heart disease, the increase in central venous pressure correlated with higher plasma concentrations of atrial natriuretic factor. High pulmonary blood flow was associated with an increase in plasma renin activity and serum aldosterone, and an increased secretion of atrial natriuretic factor.
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Critical care medicine · Nov 1994
Comparative StudyEffect of vest cardiopulmonary resuscitation on cerebral and coronary perfusion in an infant porcine model.
To determine cerebral and myocardial blood flow rates during vest cardiopulmonary resuscitation (CPR) without direct cardiac compression in an infant porcine model. Also, to determine if circumferential chest compression without the chest deformity ordinarily associated with precordial compression maintains cerebral and myocardial blood flow rates during prolonged CPR. Finally, to establish the effect of compression rate and duty cycle on cerebral and myocardial blood flow rates during vest CPR in this model. ⋯ Cerebral and myocardial blood flow rates produced by vest CPR are comparable with rates reported using other types of CPR in this model. Deterioration in blood flow during prolonged CPR occurs despite a lack of chest deformation. The deterioration in myocardial blood flow during prolonged CPR is greater when a long duty cycle is used in this model.
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Critical care medicine · Nov 1994
Hemodynamic responses to external counterbalancing of auto-positive end-expiratory pressure in mechanically ventilated patients with chronic obstructive pulmonary disease.
To study the effect of positive end-expiratory pressure (PEEP) on right ventricular hemodynamics and ejection fraction in patients with chronic obstructive pulmonary disease and positive alveolar pressure throughout expiration by dynamic hyperinflation (auto-PEEP). ⋯ In the study conditions, PEEP application up to values approaching auto-PEEP did not result in the impairment of right ventricular hemodynamics, while higher levels reduced cardiac output in selected patients.