[A rare but increasing aetiology of febrile dyspnea in the elderly]

Area of Science:

• Infectious Diseases
• Pulmonology
• Immunology

Background:

• Pneumocystis jirovecii pneumonia (PJP) is an opportunistic infection primarily associated with patients living with HIV (PLHIV).
• While PJP incidence has declined in PLHIV due to antiretroviral therapy, it is rising in non-HIV immunosuppressed populations, notably those with hematological conditions.
• This shift necessitates increased awareness of PJP in non-HIV immunocompromised individuals.

Purpose of the Study:

• To highlight the changing epidemiology of PJP.
• To emphasize the importance of considering PJP in elderly patients presenting with specific respiratory symptoms and immunosuppression.
• To guide clinicians in the early diagnosis of PJP in at-risk populations.

Main Methods:

• Review of current epidemiological data on PJP incidence.
• Analysis of clinical presentation and diagnostic challenges of PJP in diverse immunosuppressed groups.
• Case study review focusing on elderly patients with subacute pneumonia evolving to acute respiratory distress.

Main Results:

• PJP incidence is decreasing in PLHIV but increasing in non-HIV immunosuppressed patients.
• Hematological diseases are a significant risk factor for PJP in non-HIV immunosuppressed individuals.
• Elderly patients with subacute pneumonia progressing to acute respiratory distress, with or without interstitial pneumonia on chest radiography, should be evaluated for PJP in the context of immunosuppression.

Conclusions:

• PJP remains a significant opportunistic infection, with a changing demographic profile.
• Early recognition and diagnosis of PJP are crucial in elderly, immunosuppressed patients presenting with respiratory distress.
• Clinicians must maintain a high index of suspicion for PJP in non-HIV immunosuppressed patients, particularly those with hematological disorders.