Prediction of cerebral apoplexy by STI / 日本農村医学会雑誌

ABSTRACT

To make sure whether Systolic Time Intervals (STI) is useful in predicting cerebrovascular disease earlier, an analysis of the main components by the Jacoby method were made on 120 men and women ranging in age from 17 to 80. Provided that valuables are age, systolic blood pressure (st), (et/ict) cardiac stroke volume (Kv), arteriolar pulse wave compliance (comp), systolic heart radius (scrad), faculty coefficient (fi), and heart rate (hr), the subjects could be divided into two-healthy group (first major component) and hypertensive/cardio-mulfunction group (second component). This fact shows that the use of STI is effective in analyizing the function of the heart and the blood vessel system. It also proved that cardiac stroke volume and arteriolar pulse wave compliance measured by STI decreased in the cases of hypertension in which afterload rises with the elapse of time and the cases of atrial fibrillation marked by disordered diastolic period due to irregular RR intervals. These conditions, if sustained long, could cause cerebral apoplexy to occur.<BR>The cases of cerebral apoplexy were studied retrospectively. Six months before onset, arteriolar pulse wave compliance had decreased. Three months before onset, ICT and heart radius between beats had increased, while KV, ET/ICT and FI lowered. And one month before onset, systolic blood pressure rose.<BR>From the foregoing, the lowering of arteriolar pulse wave compliance, heart contraction and cardiac output, and the increase in the heart radius in the systolic period are considered the major forebodings of cerebral apoplexy.