A nurse is assessing a client who has flail chest. Which of the following findings should the nurse expect?

A. Ability to target and destroy CD4 lymphocytes: HIV targets and destroys CD4 lymphocytes, which are a key component of the immune system. This destruction weakens the immune system, making the individual more susceptible to opportunistic infections. This is a central feature of HIV's pathogenesis.
B. Conversion of the virus's RNA into DNA: The conversion of HIV's RNA into DNA occurs during replication, but this alone does not cause opportunistic infections. It is the destruction of CD4 cells that leads to the immune suppression and susceptibility to infections.
C. Having reverse transcriptase enzyme: Reverse transcriptase is an enzyme that helps HIV replicate its RNA into DNA. While essential for HIV replication, the presence of reverse transcriptase does not directly cause opportunistic infections; it is the result of the viral replication that weakens the immune system.
D. Containing only a single strand of genetic material: HIV contains single-stranded RNA as its genetic material. While this is true, the key factor in causing opportunistic infections is the virus’s ability to destroy CD4 cells, which weakens the immune system.

A. Only the flail segment pulling inward during expiration: During expiration, the pressure inside the chest decreases, and typically the chest wall recoils outward. A flail segment moves abnormally in the opposite direction during inspiration, not expiration.
B. The entire chest pulling inward during expiration: Inward movement of the entire chest during expiration is not characteristic of flail chest. This could suggest severe respiratory distress or chest wall weakness, but not the hallmark sign of flail chest.
C. The entire chest pushing outward during inspiration: This is a normal movement during inspiration and not specific to flail chest. In flail chest, the abnormality is seen in the flail segment, not the entire chest.
D. Only the flail segment pulling inward during inspiration: This is the classic finding in flail chest. Due to the broken ribs losing continuity with the rest of the rib cage, the flail segment moves paradoxically—inward during inspiration and outward during expiration—opposite to the normal chest wall motion.