downstroke
- n a stroke normally made in a downward direction
- The short downstroke, which doctors call the "Q" wave, is formed as the ventricles begin to contract to pump blood out.
- Most of all, he likes perfectionists people who make their d's Greek-style, from the bottom up after an initial downstroke.
- From there, up to 80% of it was drawn by suction into the pump chamber, held for an instant by a check valve, then pushed by the pressure of the pump's downstroke into the aorta .