While the therapist provides ventilation using a BVM, the patient's airway resistance increases and pulmonary compliance decreases. How will these changes in lung characteristics affect the delivered volume?
A. The delivered volume will decrease.
B. The delivered volume will increase.
C. The delivered volume will remain essentially the same.
D. The delivered volume will fluctuate considerably.
ANS: A
A. Correct response: During ventilation with a BVM in use, if pulmonary compliance decreases and/or airway resistance increases, the delivered volume could decrease. Because a BVM is essentially a volume-controlled ventilator, an increased resistance or decreased compliance should not effect tidal volume, unless more leaks develop or the bag distends. However, to overcome these changes in lung characteristics, the therapist needs to use two hands to squeeze the BVM, assuming that another rescuer can hold the mask in place to create a seal during ventilation.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.?
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