Final answer:
The question pertains to the distribution of patients by NYHA classification in the EMPA-Preserved Trial, which cannot be answered without specific data. The formula P'A-P'B refers to the difference in proportions of patients' reactions to two medications.
Step-by-step explanation:
The student has asked about the breakdown of patients classified by NYHA (New York Heart Association) functional classification in the EMPA-Preserved Trial. Unfortunately, without specific data on the EMPA-Preserved Trial, it is not possible to provide the exact breakdown of patients by NYHA classification. The NYHA classification system is a commonly used system in medicine to describe the degree of heart failure. It is essential for clinical assessments, treatment planning, and to gauge prognosis.
P'A-P'B represents the difference in the proportions of adult patients who did not react after 30 minutes to Medication A and to Medication B. This would involve statistical analysis to provide a comparison of the efficacy of two medications.