<P> Splitting of S2 , also known as physiological split , normally occurs during inhalation because the decrease in intrathoracic pressure increases the time needed for pulmonary pressure to exceed that of the right ventricular pressure . A widely split S2 can be associated with several different cardiovascular conditions , including left bundle branch block , pulmonary stenosis , and atrial septal defect . </P>
<P> Splitting of S2 , also known as physiological split , normally occurs during inhalation because the decrease in intrathoracic pressure increases the time needed for pulmonary pressure to exceed that of the right ventricular pressure . A widely split S2 can be associated with several different cardiovascular conditions , including left bundle branch block , pulmonary stenosis , and atrial septal defect . </P>
when is the second sound of the heartbeat produced
when is the second sound of the heartbeat produced
during inhalation
during inhalation