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Difficulty: Very hardPreventive Care and Screening

An unhoused male patient born in 19681968 presents to a community health outreach clinic to establish primary care. He has not received any medical care in nearly a decade. Medical records indicate a history of chronic hepatitis C virus infection complicated by biopsy-proven cirrhosis; he successfully completed direct-acting antiviral therapy 66 years ago and achieved a sustained virologic response. He reports a history of intravenous substance use, which he also ceased 66 years ago. The patient currently smokes 1.51.5 packs of cigarettes daily, a habit he began at age 1818. His medical history is notable for a severe anaphylactic reaction (hypotension and wheezing) to dietary eggs during childhood. Physical examination reveals scattered spider angiomas but no ascites, jaundice, or encephalopathy. Vital signs are within normal limits. Which of the following preventive health interventions are appropriate for this patient at today's visit? (Select all that apply)

  1. Hepatocellular carcinoma surveillance with six-monthly abdominal ultrasonographyAnswer
  2. Administration of a standard, egg-based inactivated influenza vaccineAnswer
  3. Annual lung cancer screening via low-radiation helical chest scanningAnswer
  4. D
    One-time abdominal aortic aneurysm screening with an abdominal duplex ultrasound
  5. E
    Initial immunization with the 2323-valent pneumococcal polysaccharide vaccine

Answer

The correct interventions are hepatocellular carcinoma surveillance, administration of an egg-based inactivated influenza vaccine, and annual lung cancer screening.
The correct interventions are based on three distinct guidelines. First, the patient is 5858 years old (2026−19682026 - 1968). According to the American Association for the Study of Liver Diseases (AASLD), patients with established cirrhosis must continue lifelong hepatocellular carcinoma surveillance with abdominal ultrasound every 66 months, even after achieving a sustained virologic response (cure) for hepatitis C. Second, regarding immunizations, the Advisory Committee on Immunization Practices (ACIP) has unequivocally stated that a history of egg allergy (including anaphylaxis) is no longer a contraindication to any influenza vaccine; patients may receive standard egg-based formulations without specialized medical observation. Finally, the patient meets the USPSTF criteria for annual lung cancer screening: he is between 5050 and 8080 years of age, has a smoking history of ≥20\ge 20 pack-years (1.51.5 packs/day ×\times 4040 years = 6060 pack-years), and currently smokes.

Step-by-Step Solution

1
Calculate the patient's age and cumulative smoking history.
The patient is 5858 years old (2026−19682026 - 1968) and has a 6060 pack-year smoking history (1.51.5 packs/day ×\times 4040 years).
Age and pack-years are required to determine eligibility for age-based screenings like lung cancer and abdominal aortic aneurysm (AAA).
2
Evaluate the need for hepatocellular carcinoma (HCC) screening in the context of his liver disease.
HCC screening with an abdominal ultrasound every 66 months is indicated.
Although the hepatitis C virus was cured (sustained virologic response), the pre-existing cirrhosis places him at permanent high risk for HCC.
3
Determine influenza vaccine eligibility given the severe egg allergy.
Standard egg-based influenza vaccine is indicated.
Updated ACIP guidelines state that an egg allergy, even anaphylaxis, is not a contraindication for any influenza vaccine. No special observation is required beyond standard protocols.
4
Assess eligibility for lung cancer screening.
Annual screening with low-dose computed tomography is indicated.
He meets all USPSTF criteria: age 50−8050-80, ≥20\ge 20 pack-year history, and is a current smoker.
5
Evaluate the remaining options (AAA screening and pneumococcal vaccine).
AAA screening is premature, and the sequence for the pneumococcal vaccine is incorrect.
AAA screening starts at age 6565. While pneumococcal vaccination is indicated for cirrhosis, it must be initiated with a conjugate vaccine (PCV20 or PCV15), not PPSV23.

Key Concept

Guideline-concordant preventive care requires synthesizing age, underlying risk factors (e.g., cirrhosis, smoking burden), and updated contraindication guidelines (e.g., removing egg allergy as a barrier to influenza vaccination).
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Topics

Preventive Care and Screening

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