Blood flow to the trachea and bronchi: the pulmonary contribution.

It is generally assumed that when pulmonary vascular pressures are normal the pulmonary contribution to central airway blood flow (Qp) is negligible compared with systemic blood flow (Qs). However, it has been suggested in recent reports that a substantial portion of central airway blood flow is Qp. We have attempted to confirm whether there is a pulmonary… (More)