A client is being discharged on long-term therapy for tuberculosis (TB). What referral by the nurse is most appropriate?

Choice A rationale

Cystic fibrosis is an autosomal recessive genetic disorder. This means that for a child to express the disease phenotype, they must inherit two copies of the defective gene, one from each parent. If only one parent carries the CF gene, the child would be a carrier but would not manifest the disease.

Choice B rationale

For an autosomal recessive disorder like cystic fibrosis, both parents must be heterozygous carriers of the defective gene. Each parent contributes one copy of the recessive allele, resulting in a 25% chance with each pregnancy that the child will inherit two copies of the defective gene and develop cystic fibrosis.

Choice C rationale

Multifactorial inheritance involves the interaction of multiple genes and environmental factors, leading to a phenotypic expression. While some complex diseases have multifactorial inheritance, cystic fibrosis has a well-defined monogenic autosomal recessive inheritance pattern, meaning it is primarily determined by mutations in a single gene, the CFTR gene.

Choice D rationale

While genetic mutations are the underlying cause of cystic fibrosis, the phrasing "probably a genetic mutation" is too vague and does not accurately explain the inheritance pattern. The mutation must be present on both alleles of the CFTR gene, inherited from carrier parents, to cause the disease.

Choice A rationale

While medications and herbal supplements can impact various physiological systems, they are not typically the direct cause of a barrel chest deformity. This specific anatomical change, characterized by an increased AP diameter, reflects chronic pulmonary overinflation rather than acute pharmacological effects, making a query about medications less relevant to the immediate observation.

Choice B rationale

An anteroposterior (AP) chest diameter that is similar to the lateral diameter, commonly known as a barrel chest, is a hallmark sign of chronic obstructive pulmonary diseases (COPD) such as emphysema. This anatomical change results from chronic air trapping and hyperinflation of the lungs, leading to a sustained elevation of the diaphragm and increased anterior-posterior thoracic expansion.

Choice C rationale

Regular aerobic exercise generally improves cardiovascular and respiratory fitness, potentially mitigating some effects of respiratory compromise. However, the presence of a barrel chest indicates a pre-existing chronic respiratory pathology that exercise alone cannot correct or directly cause. Therefore, inquiring about exercise frequency is not the most pertinent question regarding this specific physical finding.

Choice D rationale

Certain occupations (e.g., mining, construction) and hobbies can expose individuals to respiratory irritants, contributing to chronic lung diseases over time. While this information is valuable for a comprehensive health assessment, the immediate physical finding of a barrel chest directly points to underlying chronic lung pathology, making a question about chronic breathing problems more direct and immediate.