ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

摘要:

Serious impedance to air flow in the upper respiratory tract may be a complication of disease and of the means employed to improve the patency of an airway, as with endotracheal tubes and suction. A great degree of subatmospheric pressure may be developed during inspiration, in the presence of an endotracheal tube and use of the suction catheter and suction. The extent of change caused by each of these factors, separately and in combination, was measured on a lung model simulating a spontaneously breathing patient. Suction catheters with side arms designed to minimize unwanted suction during catheter manipulation were evaluated and compared with a laboratory standard. The studies revealed that subatmospheric pressures developed in the upper airway may be severe and that the side arms in suction catheters are not nearly as effective as they should be.

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

摘要:

In dogs anesthetized with halothane, increase in halothane concentration from 0.8 to 2.5 per cent (mean expired) was accompained by a 17 per cent reduction in O2consumption (Vo2) and a halving of cardiac output (Q) and arterial pressure. Repayment of an O2debt was not observed with return to 0.8 per cent halothane were reduced by measures that reduced Q and arterial pressure (vagal and paired pulse stimulation). Conversely, Vo2at 1.7 per cent halothane was increased by maneuvers that increased Q and arterial pressure (digitalis and blood or dextran administration). Change in myocardial Vo2alone is believed to be insufficient to account for the observed changes in whole-body Vo2. Accordingly, the reductions in Vo2observed with increased halothane concentration may represent indirect effects mediated by halothane-induced changes in the circulation although direct metabolic depressant effects of halothaneper sewere not ruled out.

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

摘要:

Theinvitroenzymatic production of metanephrine by o-methylation of epinephrine was significantly reduced in a cyclopropane environment. The percentage inhibition was not quantitatively related to reaction velocity.

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0003-3022    

出版商:OVID    

年代:1967

数据来源: OVID