Underbreathing, breathing that is shallower or slower than normal. Hypopnea is distinct from apnea in which there is no breathing. Hypopnea comes from the Greek roots hypo- (meaning low, under, beneath, down, below normal) and pnoe (meaning breathing).
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Breathing that is shallower, and/or slower, than normal. SYN: oligopnea. [hypo- + G. pnoe, breathing]

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hy·po·pnea or chiefly Brit hy·po·pnoea .hī-pō-'nē-ə n abnormally slow or esp. shallow respiration

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hy·pop·nea (hi-popґne-ə) [hypo- + -pnea] abnormal decrease in the depth and rate of breathing. Cf. bradypnea and hypoventilation. hypopneic adj

Medical dictionary. 2011.

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