Abdominal Breathing On Hemodynamic Changes During The Middle-aged A, B, Type A Behavior In Patients With Coronary Heart Disease Mental Arithmetic

There are two purposes in this study: 1. to compare the heart hemodynamics changes between mid-old aged type A and type B behavior patients with coronary heart disease when they are doing mental arithmetic. 2. to probe the feasibility in preventing and slowing down coronary heart disease by exerting abdominal breathing.For the first purpose, the author analyses the heart hemodynamics changes on short-term (5 minutes) of 34 type A behavior patients and those of 28 type B patients. The parameters include heart rate (HR), stroke volume (SV), cardiac output (CO), ejection fraction (EF), fractional shortening (FS), left ventricular end diastolic diameter (LVIDd), left ventricular end systolic diameter (LVIDs), aortic root diameter (AO), left atrial dimension (LA). The results show that type A behavior patients are higher than type B in stroke volume (SV), cardiac output (CO), left ventricular end diastolic diameter (LVIDd), left ventricular end systolic diameter (LVIDs), left atrial dimension (LA) and the difference are clear(p<0.05). Thus, the study suggests that type A behavior patients have more sympathetic response and more seriously pathological changes in the heart hemodynamics during stress.For the second purpose, the author divides 34 type A behavior patients into two groups after they finish the 5-minute mental arithmetic: 17 receive respiration training (the experimental group) while 17 patients do not (the control group). The changes in the heart hemodynanics are measured before and after the experiment. The parameters are the same as those used in theexperiment above. The same experiment is conducted to the 28 type B behavior patients. The results show that the heart rate (HR) decreases after the patients have the abdominal breathing while stroke volume (SV), cardiac output (CO), ejection fraction (EF)(P<0.01), fractional shortening (FS) (P<0.05) increases. Therefore, the study suggests that abdominal breathing may augment the function of left ventricle and attenuate sympathetic activation. Abdominal breathing could play an important role in treating the patients with coronary heart disease.