Computer analysis of mechanocardiograms in patients with acute respiratory insufficiency

Spectral analysis of mechanocardiograms (MCG) has been performed, using the method of fast Fourier analysis, in patients with acute respiratory failure (ARF) of various etiology. Two time intervals of the cardiac cycle have been investigated: 160 ms after the R wave on the ECG (interval A) and 160 ms after the T wave (interval B). It has been shown that patients with ARF reveal the appearance of high-frequency oscillations (31-32 and 37-38 Hz) in interval A and low-frequency oscillations (7-8 Hz) in interval B. It is assumed that one of the reasons for MCG spectrum alterations may be cardiohemodynamic resetting, as well as changes in the myocardial function and pulmonary hypertension.     

The functional characteristics of the myelinated fibers of the splanchnic nerves

Summary It is experimentally proved that all the large and middle medullated fibers, as well as about a half of the find medullated fibers belong to the afferent fibers of nervi splanchnici majores. To the effereat fibers of nervi splanchnici majores belong about a half of the fine medullated fibers contained in these nerves.Stimulation of nervi splanchnici majores, devoid of the preganglionic fibers, with the faradic current brings about a deepening of the respiration and an increase of its rate, as well as a small elevation of the blood pressure owing to the presence of the postganglionic sympathetic fibers. Stimulation of the deafferented nervi splanchnici majores brings about an elevation of the blood pressure and does not affect respiration.Submitted by Active Member of the Academy of Medical Sciences of the USSR, V. N. Chernigovsky