Truck Driving School Costs. The average length of PTDI-certified courses is four to six weeks, though courses may be as short as two weeks or as long as 12 weeks or more. The average cost of PTDI-certified courses is about $4,200, though the cost of truck driving school may be as low as $1,500 and as high as $10,000.
Orthopnea is the opposite of platypnea, shortness of breath that worsens when sitting or standing up.
A hypopnea is a decrease in breathing that is not as severe as an apnea. Hypopneas usually occur during sleep and can be defined as as greater than 30% of a normal breath. Like apneas, hypopneas also may be defined as a 3-4% or greater drop in oxygen in the blood.