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Biomedical subjects

G Dagenais

Publications and source records attributed to G Dagenais.

8 recordsLinked to original sources
PubMed1994

Double-blind randomized prospective study of the efficacy of antibiotic prophylaxis for open reduction and internal fixation of closed ankle fractures.

Antibioprophylaxis has been proven to be efficient for some orthopaedic procedures. However, its efficacy for clean limited procedures with metallic implants is not clear. One hundred twenty-two closed ankle fracture patients undergoing open reduction and internal fixation were randomized, double-blindly, to receive either cephalothin (1 g i.v. every 6 h x four doses) or a placebo starting before tourniquet application. Mean trauma-surgery delay was 30.2 h, and average tourniquet duration was 65.4 min. Four patients (three of 62 on placebo and one of 60 on cephalothin) developed a superficial wound infection. One of the patients in the placebo group was hospitalized and treated with i.v. antibiotics. However, there was no osteomyelitis or premature hardware removal. The difference between the two groups was not statistically significant (chi 2 test of appreciation p = 0.33, two-tailed probabilities). Therefore, cephalothin prophylaxis does not seem justified in this patient population. A larger series is needed to avoid a type II error.

Adult↗
PubMed1991

Activation of neurohumoral systems following acute myocardial infarction.

Previous studies have indicated that patients with an acute myocardial infarction have marked activation of all neurohumoral systems on admission to the hospital. This activation begins to subside within the first 72 hours so that by 7-10 days, all plasma neurohormones have returned to normal. The only documented exceptions were found to occur in patients with left ventricular dysfunction and overt heart failure, where both plasma renin activity and atrial natriuretic peptide were increased, and in patients with left ventricular dysfunction but no overt heart failure, where only atrial natriuretic peptide was increased. Although these studies suggest that neurohumoral activation rarely occurs at the time of hospital discharge, they were small and may have missed an important subgroup of patients with persistent neurohumoral activation. In the Survival and Ventricular Enlargement (SAVE) study, 522 patients had plasma neurohumoral levels measured at a mean of 12 days postinfarction. All SAVE patients had left ventricular dysfunction (left ventricular ejection fraction less than or equal to 40%), but no overt heart failure. In this group of patients, all neurohumoral levels (plasma renin activity, norepinephrine, arginine vasopressin, and atrial natriuretic peptide) were found to be increased compared with age-matched control subjects. These results indicate that, in fact, a subgroup of patients without overt heart failure has persistent neurohumoral activation at the time of hospital discharge postinfarction, and that this activation involves several neurohumoral systems. Since patients with persistent neurohumoral activation postinfarction are likely those most at risk of developing complications and the ones most likely to benefit from pharmacologic interventions blunting the effects of neurohumoral activation, measurement of predischarge neurohumoral levels may be useful.

Humans↗
PubMed1982

Long term treatment of two familial hypercholesterolemic heterozygote patients with batch affinity chromatography (BAC).

Two familial hypercholesterolemic heterozygote patients were treated for a period of 2 years using an extracorporeal technique involving batch affinity chromatography. In both cases LDL-cholesterol levels were drastically lowered and HDL-cholesterol levels were normalized. No untoward side effects were noted during the 2 year experimental period. These results confirm the safety and simplicity of this technique to lower considerably LDL-cholesterol levels in whole blood of familial hypercholesterolemic patients who do not adequately respond to conventional medical treatment.

Adult↗
PubMed1979

Anaesthesia for facial rhytidectomy.

Observations on anaesthesia for facial rhytidectomy in 200 patients, without tracheal intubation or artificial ventilation, are reported in this survey.

Adult↗