A nurse is caring for a full-term newborn diagnosed with persistent/patent ductus arteriosus (PDA). The newborn's caregiver asks the nurse, "What causes a PDA?" How will the nurse answer this question?

Choice A reason: The designation T3 indicates that the patient has had three full-term births, defined as births that occurred between 37 and 42 weeks of gestation. This is part of the standard obstetric history notation.

Choice B reason: The notation P1 means the patient has had one preterm birth, which is defined as a birth that occurred between 20 weeks and 36 weeks 6 days of gestation. This is an important part of understanding the patient's pregnancy history.

Choice C reason: A2 denotes that the patient has had two pregnancy losses before 20 weeks of gestation, which can include miscarriages or stillbirths. This is crucial for assessing the patient's reproductive health history.

Choice D reason: There is no indication from the notation G6, T3, P1, A2, L4 that the patient has had three elective abortions. Elective abortions would be noted differently in the patient's chart if they were part of the obstetric history.

Choice E reason: The notation L4 indicates that the patient currently has four living children. This is an important part of the patient's obstetric history as it gives insight into their childbearing outcomes.

Choice A reason: Walking unaided is a significant gross motor milestone that may be delayed in a child with chronic lung disease due to decreased physical stamina and energy levels. These children may tire easily, making it more challenging to develop the strength and coordination needed to walk independently. The need for supplemental oxygen can further limit the child's mobility and opportunities for practicing walking.

Choice B reason: Holding a crayon is a fine motor skill that may not be as significantly affected by chronic lung disease. While any serious health condition can impact overall development, fine motor skills like holding a crayon can be practiced in less physically demanding ways, even if the child has reduced stamina.

Choice C reason: Copying a circle is a developmental milestone typically expected later, around 3 years old. At 12 months, a child is not expected to perform this task, so it is not relevant in this context for identifying a delay at this age.

Choice D reason: Speaking 15 words is a language milestone that can be affected by various factors. However, chronic lung disease more directly impacts physical stamina and gross motor skills rather than speech development. While any health issue can influence overall development, speech and language milestones might not be as immediately impacted by chronic lung disease.