58:50 DAY TWO part 2

Pathophysiology of HIV

  • Definition of HIV

    • HIV (Human Immunodeficiency Virus) is an RNA virus.

    • It is classified as a slow retrovirus, indicating that it reverses from RNA to DNA.

  • Mechanism of Action

    • HIV uses reverse transcriptase to convert its RNA into DNA.

    • The viral DNA is then integrated into the host's DNA, allowing the virus to replicate using the host's cellular machinery.

  • Entry Points

    • HIV enters the body through mucosal tissues.

    • It specifically targets CD4 cells, which are a subset of T helper cells involved in immune responses.

  • CD4 Cells and Their Importance

    • CD4 cells are crucial to the immune system.

    • A normal CD4 count ranges from 500 to 1,500 cells/mm³.

    • A CD4 count of less than 200 cells/mm³ indicates progression to AIDS (Acquired Immunodeficiency Syndrome).

    • Monitoring CD4 count helps evaluate immune system functionality and progression of HIV.

HIV Replication and Impact on Immune System

  • Replication Process

    • HIV can remain dormant within its host or become active, leading to the production of new HIV particles.

    • Viral particles mature with the help of protease and eventually bud off from the CD4 cell, which leads to cell death.

  • Consequences of HIV Infection

    • Progressive loss of CD4 cells results in immune suppression, making individuals susceptible to opportunistic infections.

    • As the CD4 count decreases, the risk of developing serious infections increases.

  • Viral Load

    • High viral load refers to the quantity of HIV present in the body.

    • A high viral load increases the risk of transmission and aids in the destruction of CD4 cells.

    • Viral load may initially be high following infection, even in asymptomatic individuals.

Disease Progression

  • Stages of HIV Infection

    • Early stage: High viral load and potential flu-like symptoms (e.g., fever, night sweats, fatigue).

    • Intermediate stage: Clinically asymptomatic but can still transmit the virus.

    • Later stages lead to severe immune suppression and manifestation of AIDS-related infections.

  • Long-term Non-progressors

    • Some individuals may remain stable for years, benefiting from genetic factors that control the virus's replication.

  • Symptomatic HIV Disease

    • Begins when CD4 count drops below 500 cells/mm³. Symptoms may affect daily activities due to fatigue, weight loss, and more.

    • Symptoms include persistent lymphadenopathy, oral thrush, shingles, and neurological symptoms can occur.

Testing and Diagnosis

  • Types of HIV Tests

    • Antigen-antibody tests: Commonly used; detects both HIV antigen and antibodies.

    • Nucleic acid tests (NAT): Used to directly detect the presence of the virus in the blood.

    • Antibody tests: Detects antibodies alone, which may give negative results if performed too early in the infection.

  • Window Period

    • The time frame in which antibody tests may yield false negatives, varying from 10 to 90 days post-exposure.

Monitoring Disease Progression

  • Key Indicators

    • CD4 count and viral load are crucial for assessing immune function and disease progression.

    • CD4 count typically decreases as viral load increases, indicating worsening immune function.

  • Prophylaxis for Opportunistic Infections

    • Patients with CD4 counts below 200 cells/mm³ are at high risk for pneumonia and other infections.

    • Prophylactic medication may be introduced to prevent these infections.

Treatment and Management

  • Antiretroviral Therapy (ART)

    • ART employs three or more medications to decrease viral load and protect CD4 cells.

    • Medication adherence is crucial to prevent drug resistance and improve health outcomes.

  • Importance of Education

    • Patients need education about their medication regimens to ensure adherence and understanding of their disease.

Complementary and Alternative Therapies

  • Integration of Therapies

    • Patients are encouraged to discuss any complementary therapies (e.g., herbal remedies, acupuncture) with their healthcare team to ensure safe and effective care.

Prevention and Support

  • Prevention Strategies

    • Safe sex practices, needle exchange programs, and community resources are important for reducing transmission.

  • Emotional and Social Support

    • Emotional counseling and support groups are vital for helping patients cope with their diagnosis and treatment.

    • A transdisciplinary approach involving various healthcare professionals can enhance support for patients.

Palliative Care in HIV

  • When to Introduce Palliative Care

    • Typically introduced in the later stages of HIV/AIDS, focusing on comfort and quality of life alongside ongoing ART.

  • Role of Palliative Care

    • Addresses physical, emotional, social, and spiritual needs of the patient and their families.