Chapter 1 path

Pathology: Study of diseases, focusing on causes, processes, development, and consequences.
Importance in Radiologic Technology: Essential for understanding disease processes that are evaluated through imaging techniques.

Disease: A disorder of structure or function, especially one that produces specific symptoms or affects a specific location.
Pathogenesis: The development and progression of a disease.
Manifestation: Observable signs or symptoms of a disease.
- Symptom: Subjective evidence, e.g., headache.
- Sign: Objective evidence, e.g., fever.
Syndrome: A collection of signs and symptoms that occur together.
Etiology: The cause or origin of a disease.

Nosocomial: Infections acquired in a healthcare setting, e.g., Staphylococcal infection.
Iatrogenic: Complications resulting from medical interventions, e.g., collapsed lung from line placement.
Idiopathic: Diseases with no known cause.
Acute: Diseases with a rapid onset and usually a short duration.
Chronic: Long-lasting diseases that persist over time.
Sequelae: The aftereffects or consequences of a previous disease or injury.

Diagnosis: Identification of a disease through evaluation of symptoms, medical history, and tests.
Prognosis: A forecast of the likely outcome of a disease based on clinical findings.
Morphology: Study of the form and structure of organisms.
Subtractive/Lytic/Destructive: Terms related to the reduction of tissue or structures in diseases.
Additive/Sclerotic: Conditions resulting in increased density or mass in tissues.
Epidemiology: The study of health distribution and determinants in populations.
Prevalence: The total number of cases of a disease in a population at a given time.
Incidence: The number of new cases of a disease that occur in a specified period.

Mortality Rate: The ratio of deaths in a specified population during a defined time.
Morbidity Rate: The frequency of disease in a population.
Agencies like NCHS monitor and report health statistics to inform public health decisions.
Data can be accessed from resources like the CDC website.

Variation among demographics in life expectancy, e.g., White females: 75 years, Black males: 65 years.
Trends in life expectancy observed over multiple decades from 1970 to 2013.

Shift from inpatient to outpatient care models.
U.S. health care expenditures were approximately $3.0 trillion in 2014.
Funding sources include Medicare, Medicaid, and private insurance plans.
Impacts of the Affordable Care Act on health resource allocation and access.

In 2017, U.S. spending totaled $3,492.1 billion, allocated as follows:
- Hospital care: $1,142.6 billion (32.7%)
- Physician services: $544.2 billion
- Other major components include emergency services, nursing care, and prescription drugs.
Source: Centers for Medicare & Medicaid Services statistics.

Human Genome Project: Lasting from 1990 to 2003, coordinated by the U.S. Department of Energy and NIH.
Key terms:
- Genome: The complete set of genes or genetic material in an organism.
- Single-nucleotide polymorphisms (SNPs): Variations in a single nucleotide in the genome.
- Haplotype: A combination of alleles at adjacent locations on a chromosome.

Congenital and Hereditary: Present at birth, resulting from genetic or environmental factors, e.g., Down syndrome.
Inflammatory: Results from the body’s response to injury; includes infectious, toxic, and allergic reactions.
Degenerative: Progressive decline in function due to aging or wear and tear, e.g., osteoarthritis.
Metabolic: Disorders resulting from disruptions in normal metabolic processes, e.g., endocrine diseases.
Traumatic: Results from physical injury or external forces, e.g., fractures.
Neoplastic: Conditions involving abnormal tissue growth or tumors, can be benign or malignant.

Autoimmune disorders: Conditions where the immune system mistakenly attacks the body’s own tissues, e.g., rheumatoid arthritis.
Inflammation: Characterized by vascular responses, cellular events, and systemic symptoms such as pain and swelling.

Acute Inflammation: Immediate response characterized by heat, redness, swelling, pain, and loss of function.
Chronic Inflammation: Longer ongoing inflammation that can lead to tissue damage without immediate necrosis.
Repair processes include collagen deposition and potential scar formation.

Used to classify the severity of cancer.
- T: Size of the tumor.
- N: Lymph node involvement.
- M: Presence of metastases.
Additional factors include histopathologic type, grade, and residual tumor classification to guide treatment and prognosis.

Technological advancements in medical imaging play a crucial role in diagnosing and planning treatment for different diseases.
Interdisciplinary approaches combining imaging with various diagnostic tools enhance patient care.