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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Circadian variation of basal total vascular tone and chronotherapy in patients with vasospastic angina pectoris.

Vasospastic angina pectoris (VSA) is an anginal attack which occurs characteristically between night and early morning. The aim of this study was to clarify the cause of VSA. The subjects consisted of 16 patients with VSA, 18 patients with effort angina ( EAP) and 15 healthy individuals, who were used as the control group. Subjects were attached to an ambulatory blood pressure monitor and a non-invasive continuous cardiac output monitor concurrently, over a 24-hour period. Mean blood pressure (MBP), and cardiac index (CI) were measured. Then basal total vascular tone (TVT) was calculated as follows: basal TVT = (MBP/CI) x 1,332 dyne/sec/cm5. The decrement of CO was greater during sleeping hours as compared with the decrement of the MBP in the VSA group. Nocturnal basal TVT was significantly greater in the VSA group than in the EAP group or the control group. The increased nocturnal basal TVT was significantly suppressed by long acting calcium antagonists to the level of the EAP and the control groups. The treatment also decreased the frequency of ischemic attacks.[1]

References

  1. Circadian variation of basal total vascular tone and chronotherapy in patients with vasospastic angina pectoris. Mori, H., Nakamura, N., Tamura, N., Sawai, M., Tanno, T., Narita, T., Singh, R.B., Otsuka, K. Biomed. Pharmacother. (2002) [Pubmed]
 
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