Which of the following physiologic changes would the therapist expect a patient to experience as a result of being mechanically ventilated with positive pressure? I. increased right ventricular afterload II. decreased left ventricular afterload III. decreased pulmonary vascular resistance IV. increased systemic vascular resistance
A. I, II only
B. I, III only
C. II, IV only
D. III, IV only
?ANS: A
A. Correct response: For a relaxed patient receiving a positive-pressure breath, nearly all of the individual mechanical effects are invoked with each inspiration. Pleural pressure increases would tend to (1) decrease venous return, (2) decrease left ventricular afterload, (3) increase lung volume, (4) increase right ventricular afterload, (5) increase pulmonary vascular resistance, and (6) increase or decrease blood flow into the left atrium depending on the overall fluid volume status.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
You might also like to view...
A physician orders a T tube trial for a patient receiving ventilatory support in the assist-control mode with an FiO2 of 0.4. What FiO2 would you recommend for this patient during the sponta-neous breathing period?
a. 0.3 b. 0.4 c. 0.5 d. 0.6
Which of the following is a microcytic anemia?
a. B12 deficiency b. Sickle cell anemia c. Iron deficiency d. Hereditary spherocytosis
The creation of new solutions to improve healthcare through the use of information technology is referred to as:
A. health informatics. B. information processing. C. population health informatics. D. biomedical information.
A film badge is
placed in the operatory to monitor radiation exposure. always evaluated at the end of the year for exposure levels. attached to the patient to monitor radiation exposure. worn by the operator and is turned in to a monitoring company that will test the badge for exposure.