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Biomedical subjects

V G Petrov

Publications and source records attributed to V G Petrov.

At least 19 recordsLinked to original sources
PubMed1999

Rheodynamic model of cardiac pressure pulsations.

To analyse parametrically (in terms of the qualitative theory of dynamical systems) the mechanical influence of inertia, resistance (positive and negative), elasticity and other global properties of the heart-muscle on the left ventricular pressure, an active rheodynamic model based on the Newtons's principles is proposed. The equation of motion of the heart mass centre is derived from an energy conservation law balancing the rate of mechanical (kinetic and potential) energy variation and the power of chemical energy influx and dissipative energy outflux. A corresponding dynamical system of two ordinary differential equations is obtained and parametrically analysed in physiological conditions. As a result, the following main conclusion is made: in physiological norm, because of the heart electrical activity, its equilibrium state is unstable and around it, mechanical self-oscillations emerge. In case the electrical activity ceases, an inverse phase reconstruction occurs during which the unstable equilibrium state of the system becomes stable and the self-oscillations disappear.

Cardiac Output↗
PubMed1999

Determination of erythrocyte aggregation.

One of the most common health criteria--erythrocyte sedimentation rate (ESR)--is considered in the paper. It is shown that the simple model presented, based on the generalized Stokes formula, the blood volume conservation law, and the Smoluchowski theory of particles coagulation, makes it possible, on the basis of experimentally recorded sedimentation curves, to identify quantitatively the values of the essential physical parameters of the coupled processes of erythrocyte aggregation and sedimentation. The analytical solution of Smoluchowski equation is used to evaluate the sedimentation and aggregation rate constants. The problem of determining the erythrocyte aggregation rate (EAR) is transformed to a minimization task in which only the experimental results for ESR are needed. Experimentally ESR is measured accurately enough by using an equipment set up just for the purpose. This method of identification could be used as a diagnostic test in hematological laboratories.

Blood Sedimentation↗
PubMed1998

[Surgical treatment of soft tissue sarcomas of the pelvic girdle].

Wide excision of neoplasm is most frequently used in surgery for soft tissue tumors, on appropriate sites and whenever the "envelope" can be preserved. The most frequent site of pelvic girdle soft-tissue tumors was the glutal area (39.0 +/- 4.8%). Out of 100 patients with such sarcomas, wide excision of tumor was performed in 82, and tumor excision + bone resection--18. The former procedure was mostly used in the management of liposarcomas (26.5 +/- 4.2%), while the latter--in synovial sarcoma (33.3 +/- 4.9%).

Adolescent↗
PubMed1991

[Organ-sparing treatment of finger injuries caused by a punching].

There have been studied 1037 cases of hand and finger punch injuries, observed in 786 victims. An analysis of the trauma causes allowed to carry out the complex of preventive measures. The efficiency of these measures is testified by 3-fold decrease of occupational traumatism at Lysvensk metal works during 5 recent years. It has been stated that 496 (52.6%) of 945 finger and hand wounds were tissue avulsion and crush. These damages are typical ones in case of finger injuries with a punch. There have been analysed the results of treatment of 341 patient with scalped wounds, open fractures, finger and hand avulsions and crushes (482 wounds). It has been stated that careful surgical treatment of a wound with edge dissection, removal of damaged fatty tissue and free fractured fragments is a reliable method of infectious complication prophylaxis when the wound has been stitched without intention and the skin defects closed by means of the first skin plasty. The first skin plasty has been used for treatment of 62 wounds. Complete graft survival has been noted in 70.9% cases. In 85% of cases there have been obtained good functional results. A special section of sparing treatment presents finger replantation in case of their avulsion. Microsurgical technique has been applied with 9 patients. There have been replanted 13 fingers and 1 hand (survived 10 fingers and the hand). There have been revascularized 3 fingers (2 of them have survived).

Accidents, Occupational↗
PubMed1990

[Methods of autodermatoplasty in injuries of the extremities].

The authors have proposed a method of fixation of an autodermal graft by using a net sewn to the healthy skin areas with single knot sutures and a method of autodermatoplasty of extensive defects of the soft tissues of the extremities. These methods have been successfully used in 29 patients. There have been no complications.

Arm Injuries↗
PubMed1987

[Control and correction of tissue respiration in an injured extremity with posttraumatic changes in blood circulation].

An examination of ABB constants of the capillary blood in dynamics in 45 patients with posttraumatic alterations of the blood circulation has shown a correlation between them and the degree of disturbances of tissue respiration. Results of experiments in animals point to an improvement of tissue respiration as a response to the administration of methylene blue to the ischemic extremity. The methylene blue along with other drugs improving the microcirculation and tissue respiration was used in 4 patients and resulted in its normalization and prevented ischemic contracture.

Adolescent↗
PubMed1986

[Wound healing].

Explore the source record for details and available documents.

Humans↗
PubMed1985

[Isolated fracture of humeral eminence in children].

Fracture of the humeral bone block can be recognized by a lateral rentgenogram. An abnormal ratio of bones in the joint is seen as an overlaping of the elbow bone metaphysis shadow upon the shadow of the capitate eminence of the humeral bone in the shape of a crescent.

Casts, Surgical↗