[Correspondence of diastolic fall of pressure in the pulmonary artery to exponent and its use for calculation of hemodynamic resistance of the lesser].

In accordance with the principles of theoretical hemodynamics it is established that the diastolic fall of the pulmonary artery pressure corresponds to the exponent both in normals, and in patients with the main types of pathology. Having determined the time constant of the process by the duration of the diastolic fall of the pressure, it is possible to calculate the total hemodynamic resistance of the pulmonary circulation system. Such a calculation is simpler and more correct than the commonly used one - by the mean pressure gradient in the pulmonary artery and in the left atrium. The determinations of the catheterization data in 82 patients and the contol calculations of the total pulmonary resistance in 65 other patients support the correctness of these assumptions.