摘要:

The value of esophageal phonocardiography as a noninvasive monitor during anesthesia was studied in dogs. Esophageal phonocardiograms were analyzed using fast Fourier transform and least squares linear regression technics. This method has demonstrated that it is feasible to estimate two parameters of cardiac contractility—1/(PEP)2and stroke power—and one parameter that demonstrates the state of the vasculature—total peripheral resistance. A continuous time (analog) processor that will accomplish this task is described.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Our clinical experience and the literature regarding anesthetic management of the hypertensive patient are reviewed. Preoperative evaluation and treatment of all hypertensive patients, regardless of their degree of lability, is recommended. For emergency surgery on an untreated hypertensive patient, control of blood pressure with nitroprusside should be attempted before an awake or rapid sequence intubation. The evaluation of hypertension, the physiology of idiopathic hypertension, and the effects of treatment are discussed.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The frequency of hair transplantation for treatment of male alopecia is increasing, and much time is consumed in free scalp plug removal and implantation. The amount of time depends upon the number of grafts required. Plugs ranging in diameter from 2 to 4 mm are recommended since larger sizes have increased fibrosis and decreased hair growth. Composite grafts show greater survival when cooled; therefore, a method of local hypothermia and 5.5 mm scalp plugs were used in this study. The lowered temperature of the recipient site during the early postoperative days permitted the use of the larger grafts without fibrosis, hematoma, or infection and with improved hair growth. This technic allows better quality of hair growth, requires fewer hair plugs, and decreases operating time.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The mean inhaled oxygen concentrations received from five devices commonly used for delivering supplemental oxygen to spontaneously breathing patients were determined. The ideal technic for the determination would required direct measurement of mean alveolar oxygen concentration. Since this is not feasible, we plotted arterial oxygen tensions against known inhaled oxygen concentrations in volunteers. The fitted equations were then used to determine mean inhaled oxygen concentrations received by the volunteers while breathing from each device. The volunteers received accurately determined oxygen concentrations from those devices employing the Venturi principle at settings of 40% or less. The concentrations received did not coincide with the settings with the Venturi devices above 40%, and were highly variable with the non-Venturi devices. Variability in the concentrations received was related to the fact that the volunteers' peak inspiratory flow rates exceeded total gas flows delivered by the devices.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The diagnostic potentials of pancreatic angiography are discussed on the basis of four illustrative cases and a review of the pertinent literature. It is concluded that selective visceral angiography properly applied is of great value in diagnosing carcinoma of the pancreas and in determining resectability of pancreatic tumors.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Preoperative oral antacid therapy has been used effectively to reduce the number of emergency obstetric patients “at risk” of developing acid-aspiration syndrome. Thirty-three nonobstetric adult patients requiring emergency surgery were selected to determine whether the protective effects of antacid therapy could also be derived in this highrisk group. Maalox-treated patients had a mean gastric pH of 6.46 ± 0.5 and gastric volume 21.5 ± 3.6 ml, with none at risk, whereas control patients had mean pH of 3.71 ± 0.43, gastric volume 71.5 ± 16.5 ml, and 42.1% at risk. This report suggests that preoperative antacid therapy should reduce the incidence of acid aspiration and subsequent morbidity and mortality in patients requiring emergency surgery.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

For more than 40 years microbiologists have known that bacteria with absent or defective cell walls could survive and even multiply. Such pleomorphic or spherical variants of bacteria have been commonly called protoplasts, spheroplasts, and L-forms. Although these terms have been used interchangeably, a more precise definition of each, based on the amounts of cell wall remaining and ability to reproduce, has been recently recommended. Cell-wall-defective bacterial variants can be produced in the laboratory by antibiotics such as penicillin or other agents which damage or inhibit the synthesis of the bacterial cell wall. Variants do not usually multiply on routine bacteriologic media but may reproduce if osmotically stabilized in hypertonic media enriched with serum. By use of such special media, wall-defective bacteria and fungi have been isolated from all types of clinical specimens (blood, spinal fluid, urine, pus, and tissues such as kidney and lymph node). The role which wall-defective variants play in human disease is not yet well defined. Animal studies suggest they are rarely pathogenic as a result of invasion and multiplication. However they can produce toxins and immunogens and can persist silently in a host, particularly one being treated with penicillin or related antibiotics, and later revert to the virulent parent. Thus it is possible that wall-defective variants produce disease via toxic or immune mechanisms or serve as persister forms of microorganisms in chronic and relapsing infections. Antibiotics directed against the metabolism of the cell or cell membrane of the etiologic agent, rather than against the synthesis of the cell wall, may sometimes control such infections.

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID

ISSN:0038-4348    

出版商:OVID    

年代:1978

数据来源: OVID