[Phenocardiographic and auscultatory patterns in patients with normally functioning Björk-Shiley aortic prosthesis (author's transl)].

Phonocardiographic examination was carried out in 40 patients who had undergone to aortic valve replacement with the Björk-Shiley prothesis. The regular function of the prothesis was evaluated on the basis of the physical, radiological and electrocardiographic data. In the majority of the cases the first sound was slight.

[Phonocardiographic and auscultatory patterns in patients with normally functioning Lillehei-Kaster aortic prosthesis (author's transl)].

42 patients who had undergone aortic valve replacement with the Lillehei-Kaster prosthesis were studied. Phonocardiographic and physical examinations were carried out on these patients to determine the typical auscultatory pattern of this prosthesis. In the majority of the cases, the first sound was slight.

[Reliability of premature atrial stimulation in the study of sinoatrial conduction time (author's transl)].

Premature atrial stimulation was carried out in 32 patients, and for each stimulus the basic cycle (A1A1), test cycle (A1A2), and the return cycle (A2A3) were analyzed. When A2A3 was plotted as the function of A1A2, a biphasic pattern, characterized by a slope phase followed by a "plateau", was observed in 25 subjects. Sinoatrial conduction time (SACT) was calculated using the Strauss method, which assumes that in the plateau A2A3 = A1A1 + SACT.