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Objective method assessment of systolic pressure variation in patients who underwent cardiac surgery

Szkodny P., Karmowski W., Ziętkiewicz M.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2006

z. 26

351-356

Fluid therapy is essential part of treatment after cardiac surgery. Optimal objective monitoring of its efficacy in hemodynamic stabilization of patients is the subject of ongoing discussion. There are several methods of evaluation of fluid responsiveness and cardiac preload in clinical practice. Among them central venous pressure (CVP) and pulmonary capillary wedge pressure (PCWP) should be mentioned. On the other hand, systolic pressure variation (SPV) in mechanically ventilated patients is one of the easiest methods of measurement of fluid responsiveness. The purpose of the study was to develop SPV measurement methodology and to apply it as a marker of fluid responsiveness and cardiac preload in patients who underwent coronary artery bypass grafting (CABG) with the use of cardiopulmonary bypass (CPB).

A new approach to physically based interpretation of experimental data in 2D problems in mechanics

Karmowski W., Midura G.

Computer Assisted Mechanics and Engineering Sciences

2006

Vol. 13, No. 4

547-556

The concept of experimental data interpretation in mechanics using Dirac function is presented. The objective is to find generał differential eąuation, which may be used to approximate the stress field sought. Application of this method may convert problem from generał spline to variational one. Basic idea has been presented earlier in [6] where both theoretical data and results of experiments have been taken into account. Herę, the method has been used to solve a 2D problem. Numerical tests performed for both generated and experimental data proved its usefulness.

A concept of overlapping meshless FEM and its application in experimental mechanics

Karmowski W.

Computer Assisted Mechanics and Engineering Sciences

2001

Vol. 8, No. 4

535-542

In the paper a new meshless FEM method is proposed. The method is physically based and the defined element ensures agreement with equilibrium equations. A special functional is defined which consist of a smoothing term, a boundary term and eventually an experimental one. In one calculation both theoretical and experimental data are used to establish proper solution. The method may be used even in the case when constitutive equation is unknown, what is especially important for residual stress problems.