By using a simplified model for cardiovascular system which consists of the cardiac resistance R_h, the artery C_a, the vein C_b and the peripheral vessel R_s, the ratio of the arteriovenous pressure difference Δp to the maximum arteriovenous pressure difference Δp_M was defined as the circulatory ratio θ ≡Δp ⁄ Δp_M. It was shown that the circulatory ratio θ was θ=1 ⁄ 2 regardless of the exercise. It was revealed that this regulation is done by keeping R_h ⁄ R_s constant and the ratio is equal to the arterial compliance fraction k_a.

Appropriate clinical communication between patients and physicians requires better cooperation based on patientphysician rapport and consensus development through information sharing.Developing appropriate clinical communication is also important for safer and more reliable clinical care. The aim of the present study was to illustrate an effective politeness strategy for appropriate clinical communication.
1) We conducted focus-group interviews and performed qualitative analysis on the basis of the results of interviews of both patients and physicians.We also performed an Internet survey and organized an Internet-based discussion ofthe politeness strategy and its effectiveness.
2) Patients may consider physicians' overuse of honorifics as feigned politeness, Both patients and physicians recognize that such overuse may work against the development of rapport-based cooperation.
3) Patients may expect physicians to use simpler honorifics, such as “-san.”However, by using honorifics physicians can show respect to patients and establish a more intimate relationship with patients through both positive and negative politeness strategies.
4) When physicians can better understand and use local dialects, the effects of positive politeness may reduce the psychological distance between patients and physicians, have a relaxing effect on patients, and improve clinical information gathering.
5) A positive politeness strategy, such as admiring and talking optimistically, may have different effects depending on the patient's condition or“face.”If successful, this strategy can contribute to the behavioral changes of patients.

OBJECTIVE: To investigate Japanese physicians' use of dialects related to geographic areas and to elucidate how physicians respond to dialect-using patients.
METHODS: We conducted a web-based open survey, to which 170 anonymous physicians reported. We examined the following 1) whether dialects are used during communication with patients; 2) how to communicate with patients using dialects; and, 3) reasons for having difficulty in communicating with patients who regularly use dialects. Geographical areas were divided into the following 8 areas Hokkaido-Tohoku, Kanto, Koshinetsu-Hokuriku, Tokai, Kinki, Chugoku, Shikoku and Kyushu-Okinawa.
RESULTS: Of 170 physicians, 61.2% (95% CI: 53.4-68.5%) reported using dialects. These proportions differed by geographic area (F= 8.141; p<0.001) . Physicians practicing in Shikoku and Chugoku used dialects most frequently, while those practicing in Kanto and Hokkaido-Tohoku used dialects least frequently. Many dialect-using physicians thought that physicians should use the same dialect as dialect-using patients. In addition, dialect-using physicians were more likely to think that a physician-related factor was responsible for having difficulty in garnering clinical information.
CONCLUSIONS: Use of dialects by Japanese physicians during communication with patients seems common and may differ by geographic areas. Physicians' use of dialects could be a useful tool for effective clinical communication.