[Correlation between occurrences of spontaneous K-complex and the two physiological rhythms of cardiac and respiratory cycles (author's transl)].

For this study, spontaneous K-complex (spo-K) during slow wave sleep (stage 2) were observed on eleven normal subjects ranged for 17 to 37 years of age. And the cardiac and respiratory cycles of two physiological rhythms were simultaneously recorded with EEG to investigate the occurrences of spo-K. 1) The spo-K occurrences time-locked to EKG-R waves during both inspiration and expiration were found to have triple peak latencies of distribution such as 200--300, 400--600 and 800--900 msec. respectively (analytic time: 1000 msec.). 2) As above mentioned, these triple peak latencies of spo-K were corresponded respectively with those of computer-averaged cortical potentials time-locked to EKG-R waves such as Nw, Nx and Ny which were simultaneously recorded. 3) The types of spo-K were divided into three groups such as A, B and C types. A and B of spo-K were attributed to interaction of cardiovascular and respiratory afferent impulses respectively. Otherwise, C type of spo-K was attributed to other unknown visceral afferent impulses or unknown brain mechanism. 4) Spo-K appeared during sleep corresponding with both hiccup and EKG in a 28-year-old epileptic patient with hiccup. In our studies, we made special attention of cardiorespiratory nervous system aimed at the genesis of spo-K occurrences.