DIFFERENTIAL DIAGNOSIS METHOD FOR RECOGNIZING ANGINA PECTORIS CASES Russian patent published in 2008 - IPC A61B5/452 

FIELD: medicine.

SUBSTANCE: method involves recording and analyzing rhythm cardiogram (RCG) data. RCG segments are recorded in rest state and under functional tests - active orthostatic AOT, Valsalva test (VT), Ashner test (AT), controlled physical exercise test(PWC₁₂₀). RCG fragments are recorded that are characterized by segments having no wave change(s) under functional tests of various intensity. Tests are determined in which stabilization segments occur and their duration is recorded. If stabilization segments are recorded under PWC₁₂₀ loading only, additional test with Nitroglycerol taken is carried out. If they vanish in the Nitroglycerol test, initial angina pectoris is diagnosed that corresponds to the first class according to Canadian classification. If stabilization segments are recorded under PWC₁₂₀ and AOT and they do not vanish in the Nitroglycerol test, moderate angina pectoris is diagnosed that corresponds to the second class according to Canadian classification. If stabilization segments are recorded under PWC₁₂₀, AOT, VT and AT and they do not vanish in the Nitroglycerol test, severe angina pectoris is diagnosed that corresponds to the third or fourth class according to abovementioned classification. Ischemia episode duration is determined from the number of intervals recorded on stabilization segment from expression RRxn, where RR is the interval length in s, n is the number of these intervals on stabilization segment. Changes of stabilization segments duration on RCG are interpreted in terms of abnormal process duration. The more often stabilization segments occur and their duration grows, the more often and longer angina pectoris episodes. Treatment results are also evaluated. The treatment being effective, stabilization segments occur more seldom, become shorter or vanish completely.

EFFECT: high accuracy of diagnosis.

2 cl, 6 dwg