When the pressure around the chest wall returns to that of the surrounding air, expiration occurs passively owing to the elastic recoil of the lungs and chest wall. However, during the poliomyelitis epidemic mortality decreased from 87% to 40% when INPV was replaced by positive-pressure ventilation.
Part-Time Per-Credit Costs. The per-credit-hour charge for part-time undergraduate students at Wilmington University in 2015 - 2016 was $346. Typically, college classes consist of 3 or 4 credits, bringing the cost per class to $1,038 or $1,384. At many colleges, full-time tuition kicks in at around 12 credit hours.
Larmar University charges $150 per credit hour per semester for online programs. The cost per credit hour at Liberty University is $325 per credit for full-time students and $365 per credit for part-time students. The University of Massachusetts charges $330 per credit hour. The most affordable online RN to BSN programs provide registered nurses with various options for continuing their nursing education.