摘要:

At operation the body temperature of mechanically ventilated infants was initially decreased to 25–22°C with surface cooling and further lowered to 16°C by total body perfusion. During circulatory arrest, averaging 40 min, repair of complex intracardiac deformities was carried out. Rewarming to 36°C was achieved by 35–65 min of total body perfusion. Of 29 infants, 23 under 10 kg survived their correction; normothermic ventilation without added CO2was given throughout the cooling period. The following measurements were made: gas exchange, lung mechanics, heart rate, arterial pressure, right atrial pressure, cardiac output (Qt), ECG, core and nasopharyngeal temperature, as well as biochemical determinations. During surface cooling O2consumption (Vo2), CO2production (Vco2), endtidal CO2(PETco2) and Paco2decreased proportionally and linearly with body temperature. Inspiratory resistance, total compliance, physiological dead space (VD/VT), and the single breath CO2curve did not reveal disturbed lung function. Mean arterial pressure was 98, 90, and 70 mm Hg and heart rate was 141, 107, and 76 beat/min, at temperature 35, 30, and 25°C, respectively. Cardiac index was 2.2 ± 0.2 liter/min/m2(mean ± SEM,n= 25) 2 hours after surgery. Arterial lactate reached peak values of 4.1 ± 0.3 mM/liter (n= 17), during rewarming but returned to normal. Respiratory alkalosis caused by hyperventilation during cooling caused no apparent harm. No neurological damage was observed. It is concluded that surface cooling performed with normothermic ventilation under guidance of core temperature, Vo2, PETco2, and Vco2, is a safe method.

ISSN:0090-3493    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

A new controllable suction catheter is described which was used for blind cannulation of the main stem bronchi. Cannulation of the right main stem bronchus was successful in 24 of 25 attempts (96%). Cannulation of the left main stem bronchus was successful in 22 of 25 attempts (88%). The use of a controllable tip suction catheter increases the rate of successful cannulation of the left main stem bronchus compared to previous reports in the literature.

ISSN:0090-3493    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

A variable-orifice pneumotachograph is described. It has a resistance that is relatively constant over a flow range from 0.1 to 2.5 liter/sec so it puts out a differential pressure signal that is directly proportional to flow. It is specifically designed for monitoring respirator patients and sacrifices some of the accuracy of a laminar flow (Fleisch) type device to gain greatly improved immunity to artefacts caused by airway water.

ISSN:0090-3493    

出版商:OVID    

年代:1978

数据来源: OVID

ISSN:0090-3493    

出版商:OVID    

年代:1978

数据来源: OVID