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Biomedical subjects

L A Ivanov

Publications and source records attributed to L A Ivanov.

At least 37 records · Page 2Linked to original sources
PubMed1976

[Clinico-electromyographic characteristics of piriform muscle syndromes].

The report is concerned with the screening methods of lesions of the piriformis muscle in the piriformis syndrome which is more frequently connected with sacral osteochondrosis. However, this syndrome may sometimes appear in an ankylosis of the hip joint. All the diagnostical methods may be divided into 3 groups: indirect clinical method, palpation and EMG. The first method does not require special experience. A palpation of the piriformis muscle is conducted bimanually by a method proposed by the authors. EMG studies with the aid of needle electrodes permit to distinguish spasms and more crude changes in the piriform muscle.

Adult↗
PubMed1976

[Indicators of bioelectric activity of the myocardium and gas exchange in threshold physical exertion of old patients with ischemic heart diseases].

ECG, pulmonary ventilation and gas exchange were recorded in 36 patients with ischemic heart disease and in 8 practically healthy persons of advanced age bearing a stepwise increasing physical load. In case of an obvious ischemic heart disease the tolerance of physical exertions was found to decline. Under a threshold physical load such patients demonstrate an excess ventilation; a decreased oxygen pulse and a lesser increment of the respiratory quotient, as well as a reduced coefficient of recovery, of the restored oxygen consumption rate, the respiratory rate, minute respiratory volume after exertion. In cases of a possible ischemic heart disease at advanced age the tolerance of physical efforts and a number of spiroergometric indices under a threshold load continue at the same level as in healthy people.

Age Factors↗
PubMedDate not supplied

[Effect of hyperoxia on indices of external respiration, cardiovascular system and blood gas composition].

In eight healthy male test subjects, aged 19-32, pulmonary ventilation, oxygen consumption, partial pressure of oxygen and carbon dioxide in the alveolar air, arterial and venous blood, ECG, arterial pressure and skin microcirculation were measured during 20 min inhalation of 70% oxygen. In hyperoxic subjects cardiac output remained unaltered, respiration rate decreased, respiration volume increased, alveolar-arterial and arterio-venous difference of PO2 increased, the difference between the actual and expected Q-T slightly decreased, capillary cirulation changed indicating a spactic reaction of peripheral vessels. At the same time oxygen consumption, ventilation equivalent, coefficient of oxygen utilization, partial pressure of carbon dioxide in the alveolar air, arterial and venous blood, heart rate, maximum arterial pressure remained essentially unchanged.

Adult↗
PubMedDate not supplied

[The biological age of the respiratory system].

A model of the biological age of the respiratory system is described. The following biological age determinants are used: vital lung capacity, maximal breathing capacity, mid-expiratory flow rate, oxygen consumption. They commonly meet the requirements of the biological age measurement tests as well as reflect main symptoms of the respiratory system ageing. The proposed model has been used to study the peculiarities of the respiratory system ageing in the Abkhasian population and to assess the effect of smoking on this process.

Adult↗