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[Influence of respiratory cycle on the flows in the entry and exit chambers of the left ventricle]
T Ferreira1, M M Carmo, R Soares
1Serviço de Cardiologia do Hospital de Santa Marta, HCL.
Objectives:
to analyse the effects of the normal respiration in the flows of left ventricle inflow and outflow tracts by Pulsed Doppler Echocardiography.
Study Design:
prospective study of normal subjects.
Materials And Methods:
twenty normals subjects by physical examination, electrocardiographic, radiological and echocardiographic criteria, aged between 23-70, mean 47.5 +/- 14; they were registered the inflow and outflow tracts flows simultaneously with the respiratory cycle. We analysed the peak early and end diastolic velocities and time intervals in the inflow tract flow and peak velocity and time intervals in the outflow tract and their changes with respiration.
Results:
during expiration, there was a significative higher peak early velocity in the inflow tract and in the maximal velocity in the outflow tract of the left ventricle; there was no significative changes in the time intervals.
Conclusions:
it's important do not forget the changes of the different indexes used to determine the volumes, cardiac output and left ventricle function observed during normal respiration, in a normal or patient population.