[The development of chronic heart failure in elderly patients with low ejection fraction at baseline in the acute phase of myocardial infarction].

There was performed analysis according to 5-year follow incidence of heart failure in patients with acute myocardial infarction (AMI) with low ejection fraction in A; the characteristics of chronic heart failure (CHF) in elderly and senile were determined; the value of a number of clinical and morphological parameters for prediction of CHF were studied. The study included 135 patients of Intensive Care Unit with a diagnosis AMI showing according to the initial echocardiography reduced ejection fraction in the first 24-48 hours. In the course of monitoring patients, routine methods of clinical examination were used, the main quantitative technique was echocardiography, qualitative indicators were assessed including by collecting anamnesis and filling out questionnaires for heart failure, and then standard statistical methods were used.

[Methodic approaches to evaluation of microclimate at workplace, with application of various types of protective clothing against occupational hazards].

Studies of heat state of human involved into physical work in heating environment and having various protective clothing on demonstrated value of the protective clothing in modifying thermal load on the body and possible decrease of this load through air temperature and humidity correction, shorter stay at workplace. The authors presented hygienic requirements to air temperatures range in accordance with allowable body heating degree, suggested mathematic model to forecast integral parameter of human functional state in accordance with type of protective clothing applied. The article also covers necessity of upper air temperature limit during hot season, for applying protective clothing made of materials with low air permeability and hydraulic conductivity.

[Occupational microclimate. Results and prospects of research].

The article covers results of studies conducted over last 15 years and aimed to elaboration of requirements to integral parameters of microclimate at workplace, its evaluation and regulation, prophylactic measures against body overcooling and overheating. The authors present methods to evaluate combined effects of physical factors (noise, vibration, microclimate) and to assess microclimate with consideration of factors determining body thermal load (energy expenditure, duration of stay at workplace, heat insulation of clothes and thermo-physical parameters of its materials). Mathematic models of forecasting cold and heat stress are presented, as well as requirements to heat insulation for individual protective means against cold and methods to calculate it.

[Physiological and hygienic rationale for the duration of exposure to the heating environment and comfortable thermal conditions during a workshift].

The strain in different functional systems of human body maintaining thermal homeostasis that develops during work under heating conditions results in impaired working capacity and efficiency and may be harmful to health. One of the most efficacious measures is the reduction of exposure to the adverse conditions and its rational alternation with rest in the comfortable environment. Based on the mathematical and statistical analysis of the results of multiple-factor experiments, we derived a multiple regression equation describing the quantitative dependence of the integral index of human body thermal regime on the totality of factors responsible for thermal strain.

[Comparative evaluation of methods accepted by Russian and international standards to assess total resistance of special cold-proof clothing set].

Experimental studies helped to compare methods determining and calculating total heat resistance of clothing sets accepted by Russian and international standards. Findings are that difference in the total heat resistance values calculated on humans and on dummies in relatively still air and quiet conditions is caused by measurement technique applied. Significant difference in the total heat resistance values calculated in windy conditions or during walk require further research aimed to study influence of those factors on clothes' heat resistance.