pulmonary shunt ( qs/qt ) was calculated in 49 mongrel dogs weighing 18-20 kg during mechanical ventilation , before and during deliberate hypotension with either nifedipine ( group n ) , diltiazem ( group d ) , labetalol ( group l ) , or ethyl alcohol and polyethylene glycol ( group e ) .
C0020649
hypotension
C0012373
diltiazem