PubMed Health⌕ Search

Biomedical subjects

G Francis

Publications and source records attributed to G Francis.

117 records · Page 7Linked to original sources
PubMed1973

Biosynthetic pathway of desmosines in elastin.

1. Elastins purified by various methods from the ligamentum nuchae and the lungs of cattle of various ages were analysed for amino acid compositions and lysine-derived cross-links. 2. In fully mature elastins from adults the main cross-links were desmosine, isodesmosine and lysinonorleucine and the so-called aldol-condensation product. Trace amounts of merodesmosine were also found. 3. During the normal maturation of elastins the amounts of desmosine, isodesmosine and lysinonorleucine increased, whereas the aldol-condensation product and intact lysine residues decreased and merodesmosine remained the same. 4. Elastins from young animals contained significant amounts of dehydromerodesmosine whereas elastins from adults contained virtually nil. Evidence is presented which suggests that the biosynthetic pathway of desmosine and isodesmosine proceeds via the aldol-condensation product and dehydromerodesmosine.

Age Factors↗
PubMedDate not supplied

A behavioral comparison of female adolescent inpatients with and without borderline personality disorder.

Patients with borderline personality disorder (BPD) are thought to have problematic hospitalizations. This study seeks to examine this phenomenon in adolescence by documenting the specific problem behaviors exhibited by patients, and the staff interventions in response to these behaviors in patients with and without BPD. Data were collected from the charts of 81 hospitalized adolescent girls regarding restraints, seclusions, incidents of self-abuse and aggression, incidents of signing the intent-to-leave form, nonroutine drug and/or alcohol screens, and discharges against medical advice. The two groups were compared using the analysis of variance (ANOVA) statistic for continuous variables and the chi-square statistic for the categorical variable. A follow-up multivariate ANOVA (MANOVA) was performed using the length of stay as a covariate. The BPD group displayed significantly higher rates of certain behaviors per day, but not of others. The length of stay was significantly higher in the BPD group. Further analysis indicated that some of the behavioral differences between the two groups may be due to the effect of the difference in length of stay. The data also suggest that while most BPD patients behave similarly to other patients, there may be a subset of BPD patients who behave in an extreme manner while hospitalized. BPD patients may display more of certain problematic behaviors than non-BPD patients in the hospital. However, it is hypothesized that these differences in hospital behavior may be largely due to the different lengths of stay between the two groups or to an acting-out subgroup of BPD patients.

Adolescent↗
PubMedDate not supplied

Ambulatory ventricular arrhythmias in patients with heart failure do not specifically predict an increased risk of sudden death. PROMISE (Prospective Randomized Milrinone Survival Evaluation) Investigators.

BACKGROUND: Ventricular arrhythmias are a frequent finding in congestive heart failure (CHF) patients and a cause of concern for physicians caring for them. Previous studies have reached conflicting conclusions regarding the importance of ventricular arrhythmias as predictors of sudden death in patients with CHF. This study examined the independent predictive value of ventricular arrhythmias for sudden death and all-cause mortality in PROMISE (Prospective Randomized Milrinone Survival Evaluation). METHODS AND RESULTS: Ventricular arrhythmias were analyzed and quantified by use of prespecified criteria on baseline ambulatory ECGs from 1080 patients with New York Heart Association (NYHA) class III/IV symptoms and a left ventricular ejection fraction </=35% enrolled in PROMISE. The relationship of ventricular arrhythmias and other clinical parameters to overall mortality and sudden death classified by an independent, blinded mortality committee was determined. There were 290 deaths, of which 139 were classified as sudden. Of the several measures of ventricular ectopy that were univariate predictors, the frequency of nonsustained ventricular tachycardia (NSVT) was the most powerful predictor and remained a significant independent predictor when included with other clinical variables in multivariate models of both sudden death mortality and non-sudden death mortality. However, multiple logistic analysis with models including the clinical variables with and without the NSVT variable demonstrated that the frequency of NSVT did not add significant information beyond the clinical variables. CONCLUSIONS: This study demonstrates that ventricular arrhythmias do not specifically predict sudden death in patients with moderate-to-severe heart failure. Thus, the finding of asymptomatic NSVT on ambulatory ECG does not identify specific candidates for antiarrhythmic or device therapy.

Arrhythmias, Cardiac↗
PubMedDate not supplied

Reducing the risk of aviator-multifunction display interface problems with human factor models and optimization design methods.

Multifunction display and control systems (MFDCSs) in modern cockpits use computer-generated graphics and symbology that have integrated and largely replaced the myriad discrete electromechanical flight instruments found in older aircraft. While much is known about the physical and visual properties of MFDCSs, less is known about which human factors are the most important for optimum design and use. Reports in the literature indicate that poor MFDCS design can adversely influence flight performance. However, current MFDCS content design methods do not quantify the relative importance of different cognitive and psychomotor factors. This article discusses the need for practical human factors-oriented MFDCS design tools to optimize the distribution of systems information and functionality. Such advances may lead to better designed MFDCSs that reduce aircrew workload and stress and improve flight performance during both routine and emergency procedures.

Aerospace Medicine↗