Physician Assistant Formulating a Diagnosis 2

Question 1

A 55-year-old man presents with exertional chest pain radiating to the left arm, diaphoresis, and nausea. Which diagnosis should be highest on the differential?

Accepted Answer

Acute myocardial infarction

Answer

Classic symptoms of exertional chest pain with radiation to the left arm, diaphoresis, and nausea point strongly to acute myocardial infarction as the primary diagnosis.

Question 2

A PA uses Bayesian reasoning when formulating a diagnosis. Which factor most directly influences the post-test probability of a disease?

Accepted Answer

Pre-test probability combined with test sensitivity and specificity

Answer

Bayesian reasoning integrates pre-test probability with the likelihood ratios derived from test sensitivity and specificity to determine post-test probability.

Question 3

Which cognitive error occurs when a PA stops searching for additional diagnoses after identifying one that explains most of the patient's symptoms?

Accepted Answer

Premature closure

Answer

Premature closure is the tendency to stop considering alternative diagnoses once an apparently satisfactory explanation is found, risking missed comorbidities.

Question 4

A 28-year-old woman presents with pleuritic chest pain, hemoptysis, and recent long-haul flight. Which diagnosis should be immediately considered?

Accepted Answer

Pulmonary embolism

Answer

Pleuritic chest pain, hemoptysis, and recent immobilization from a long-haul flight constitute classic risk factors and symptoms for pulmonary embolism.

Question 5

When building a problem representation, which element best distinguishes it from a simple symptom list?

Accepted Answer

A concise synthesis that highlights key epidemiological, temporal, and clinical features

Answer

A problem representation distills the case into a one-line synthesis emphasizing the most discriminating features to guide differential diagnosis.

Physician Assistant Practice Test

Physician Assistant Practice Test

Physician Assistant Formulating a Diagnosis 2