Author
phamdat
View
222
Download
4
Embed Size (px)
409
attempt to make democracy work in a society which isyearly becoming more complex. ’ B
INFECTIONS WITH NON-SPORING ANAEROBESTHE frequency of gas gangrene and tetanus in the
wounded of the 1914-18 war led to much useful researchon the spore-bearing anaerobes, resulting in new methodsfor their cultivation and identification. The presentwar has given a further stimulus to the study of theseanaerobic bacteria, but so far little attention has beenpaid to the non-sporing anaerobes. MacLennan hasdescribed a gangrenous myositis, to be distinguishedfrom clostridial gas gangrene, due apparently to a
symbiotic action between the anaerobic streptococcus andone or other of the aerobic pyogenic cocci, while onanother page Forbes and Goligher report a case of genera-lised infection with a pleomorphic anaerobic gram-negative bacillus, Bacterium necrophorum. In peace-time these two organisms, the anaerobic streptococcusand the necrophorus bacillus, are not infrequentlyassociated with severe and characteristic-though, tothe uninitiated puzzlin-infections, and they are likelyto be responsible for similar infections in war casualties.
In civilian practice generalised infection with thesenon-sporing anaerobes is seen most often after difficultlabour or septic abortion where there are retainedproducts acting as a culture medium. Pelvic peritonitis,or more typically, septic thrombophlebitis, follows, andfrom the thrombophlebitis emboli are thrown off intothe circulation to be riddled out in the lungs particularly.Empyema is a common sequel to these multiple lungabscesses. Clinically this type of infection is charac-
terised by a remittent temperature to 103°-105° F. asso-ciated with daily rigors, signs of lung involvement, anincreasing anaemia and a downhill course. Spontaneousrecovery sometimes occurs for no obvious reason ; theinfection resists sulphonamide therapy. Anaerobic blood-culture reveals a non-haemolytic streptococcus or a finegram-negative bacillus, alone or associated with each otheror with other bacteria such as diphtheroids, enterococci,or coliform bacilli. An essentially similar syndrome hasbeen described by French writers 2 as a sequel to periton-sillar abscess ; the anaerobic gram-negative bacillus inthese infections is called Bacillus funduliformis but is
probably identical with Bact. necrophorum. Theseorganisms, incidentally, are poorly pathogenic for
laboratory animals, and in this respect differ from theBact. necrohoum of calf diphtheria, foot-rot in sheep,and labial necrosis of rabbits. Harris and Brownwho recovered the organism from infected caesarean ’
wounds, therefore suggested the name " pseudo-necro-phorus " for the human variant. Both the necrophorusbacillus and the anaerobic streptococcus, of which thereare also several variants,4 are to be found in the healthybody cavities (mouth, intestine and female genital canal)*and infection with one or other of them usually followssome necrosis or devitalisation of local tissue. The
range of these infections had lately been reviewed byMeleney and his co-workers.5 Wounds elsewhere in the
body, especially if there is necrotic tissue, may also actas a primary focus, and this is a possible explanation ofForbes and Goligher’s case where the infection began atthe site of a compound fracture of the thigh.
Routine anaerobic culture needs to be practised morein bacteriological laboratories so that infections of thistype shall not be missed. Useful advice is given in thesecond edition of the Medical Research Council’s memo-randum no. 2 on gas gangrene. ,
1. MacLennan, J. D. Lancet, 1943, i, 584.2. Lemierre, A. Ibid, 1936, i, 701.3. Harris, J. W. and Brown, J. D. Bull. Johns Hopk. Hosp. 1927,
40, 203.4. Prévot, A. R. Manuel de Classification et de Détermination des
Bactéries Anaérobies, Paris, 1940, p. 27.5. Sandusky, W. R., Pulaski, E. J., Johnson, B. A., Meleney, F. L.
Surg. Gynec. Obstet. 1942, 75, 145.
TOO MUCH SUNAir Commodore Morton told the Royal Society of
Tropical Medicine and Hygiene on March 16 something ofhis experiences in the prevention and treatment of heateffects during five hot seasons in Iraq. Superstitionsabout sunstroke have been .discarded with spinal pads,but the topee is still useful in really hot parts of thetropics. Ill effects from the sun are due simply to over-heating of the tissues and body fluids ; they are essenti-ally similar to those seen in furnace workers in temperateclimates. The least serious result is fainting, caused bytemporary cardiovascular disturbance but without
derangement of the chloride balance. More serious.exposure leads to heat exhaustion. Collapse, profuseperspiration, fall in blood-pressure, nausea, vomiting andsevere muscular cramps are associated with a fall in bloodand urinary chlorides. Mouth temperature may benormal but rectal temperature is often raised to 100° or101° F. The victims are usually of the lean, anxious andspare type ; many are affected soon after their firstarrival in hot climates. Treatment is best carried out ina temperature of about 75° F. Abundant fluid, withglucose and sodium chloride, should be given by mouth.If necessary, 0.9% sodium chloride must be given intra-venously, but it is important to keep careful watch onthe balance between input and output of fluids ; other-wise there is a serious risk of pulmonary oedema. Diuresisand a rise in urinary chlorides are reliable signs of
recovery. Attempts to correct acidosis or alkalosis shouldnot be made in the absence of strict biochemical control.The most serious condition is that of heat hyperpyrexia.
Thick-necked chronic alcoholics with high blood-pressureare most often affected, usually after they have beenseveral years in the tropics. Besides a fall in urinarychlorides there is a failure of heat regulation. Theflushed face, dry burning skin, delirium or coma areassociated with rectal temperatures up to 108°-112° F.If life is to be saved the temperature must be broughtdown quickly to 102-103° F. by whatever means ’ areat hand. In active service conditions, an iced enemais indicated, but this interferes with the recording ofrectal temperatures. In hospitals, sponging with coldor iced water and the use of fans should be continueduntil the temperature falls. A useful wind-tunnel wasimprovised with a shock cradle covered by d blanket.Ice-bags were hung from the roof, and fans blew a streamof cold air over the body. Air-conditioning of wards isa great help to nu-rsing ; 60° F. is the temperature recom-mended for the initial stages, but as soon as the dangerfrom hyperpyrexia is past the patient should be nursedat 75° F. Fluid with salt and glucose should be givenby mouth ; intravenous salines are seldom needed unlessvomiting is persistent-they may do harm by overload-ing a failing circulation. It is important to be sure thatsymptoms are not due to malignant tertian malaria, andintravenous quinine should be given if any doubt arises.Much can be done to prevent casualties from heat effects
by ensuring that newcomers are introduced graduallyto the sun, and by arrangement of working hours so- asto allow as many as possible to spend some of theiroff-duty time in air-conditioned rooms. Men should be
encouraged to " drink more water " and " eat more salt."
When the thermometer is really high, extra salt shouldbe put in the food. To ensure that this is done the medicalofficer may have to take his courage in one hand and a
bag of salt in. the other and have it out with the cook.
Brigadier F. A. E. CREW, FRs, has been appointed tothe Bruce and John Usher chair of public health in theUniversity of Edinburgh in succession to Prof. P. S.Lelean who has retired. Dr. Crew has held the Buchananchair of animal genetics in the university since 1928,but for nearly two years has been working in the medicaldepartment at the War Office, where he is director ofbiological research.