Natural History of Disease
Nishitha A
7th term
Objectives
• Introduction
• Phases
• Epidemiological Triad
• Factors causing disease: Agent, Environment,
Host
• Risk Fact...
FAQ’s in RGUHS
• Natural history of Disease with stages
• Macroenvironment
• Risk Factors in Disease
• Epidemiological Tri...
Introduction
• Natural history of disease refers to the
progress of a disease process in an individual
over time, in the a...
Phases of Disease
Disease
Process
Pre-Pathogenesis Pathogenesis
Pre-Pathogenesis
• Period of disease before man is involved
• Process of disease in the environment
• Man in the Midst of ...
Epidemiologic triad
Pathogenesis Phase
The pathogenesis phase begins with the entry of
the disease “agent’’ in the susceptible human
host. The...
Agent
• A substance , living or non-living, or a force,
the excessive presence or relative lack of
which may initiate or p...
Types of Agents
Agents
Biological Nutrient Physical Chemical Mechanical Social
Biological Agents
Nutrient Agents
Physical Agents
Chemical Agents
Endogenous Exogenous
Social Agents
Host factors
Host Factors
Demographic
Biological
Socio-economic
Lifestyle
Host Factors
Environmental Factors
Environment
Physical Social Psychosocial
Macro-environment
All that which is external to the
individual human host, living and
non-living, and with which he is in
...
Physical Enviroment
Biological Environment
Psychosocial Environment
Risk Factors
• Applicable to those diseases where the
disease agent cannot be established.
• Definition : An attribute or ...
Risk Factors- Types
Modifiable
Unmodifiable
Risk Factors
Prominent Risk Factors- Heart Diseaes
Risk Groups
Spectrum of Disease
Spectrum of Disease
Iceberg Concept of Disease
References
• Park’s Textbook of Preventive & Social
Medicine – 23rd Edition
• www.googleimages.com
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Natural history of diseases

Natural history of disease is a very important concept in Community Medicine. I had prepared this presentation in a very short duration for my class presentaton. There is not a lot of text in the presentation but there is a really good collection of images. Uploading it in the hope that atleast someone out there will find it useful.
Published on: Mar 3, 2016
Published in: Health & Medicine      
Source: www.slideshare.net


Transcripts - Natural history of diseases

  • 1. Natural History of Disease Nishitha A 7th term
  • 2. Objectives • Introduction • Phases • Epidemiological Triad • Factors causing disease: Agent, Environment, Host • Risk Factors • Risk groups • Spectrum of Disease • Iceberg of Diseases
  • 3. FAQ’s in RGUHS • Natural history of Disease with stages • Macroenvironment • Risk Factors in Disease • Epidemiological Triad • Iceberg Phenomenon • Spectrum of Disease
  • 4. Introduction • Natural history of disease refers to the progress of a disease process in an individual over time, in the absence of treatment or prevention. • Key concept in Epidemiology • Each disease has its own, unique natural history.
  • 5. Phases of Disease Disease Process Pre-Pathogenesis Pathogenesis
  • 6. Pre-Pathogenesis • Period of disease before man is involved • Process of disease in the environment • Man in the Midst of disease • The disease agent has not yet entered man, but the factors which favour its interaction with the human host are already existing in the environment.
  • 7. Epidemiologic triad
  • 8. Pathogenesis Phase The pathogenesis phase begins with the entry of the disease “agent’’ in the susceptible human host. The disease agent multiplies and induces tissue and physiological changes, the disease progresses through a period of incubation and later through early and late pathogenesis .
  • 9. Agent • A substance , living or non-living, or a force, the excessive presence or relative lack of which may initiate or perpetuate a disease process. • May be a single agent/combination of 2 independent agents
  • 10. Types of Agents Agents Biological Nutrient Physical Chemical Mechanical Social
  • 11. Biological Agents
  • 12. Nutrient Agents
  • 13. Physical Agents
  • 14. Chemical Agents Endogenous Exogenous
  • 15. Social Agents
  • 16. Host factors Host Factors Demographic Biological Socio-economic Lifestyle
  • 17. Host Factors
  • 18. Environmental Factors Environment Physical Social Psychosocial
  • 19. Macro-environment All that which is external to the individual human host, living and non-living, and with which he is in constant interaction.
  • 20. Physical Enviroment
  • 21. Biological Environment
  • 22. Psychosocial Environment
  • 23. Risk Factors • Applicable to those diseases where the disease agent cannot be established. • Definition : An attribute or exposure that is signifiantly associated with the development of a disease. • Presence of a risk factor disease will occur • Absence of a risk factor absence of disease
  • 24. Risk Factors- Types Modifiable Unmodifiable
  • 25. Risk Factors
  • 26. Prominent Risk Factors- Heart Diseaes
  • 27. Risk Groups
  • 28. Spectrum of Disease
  • 29. Spectrum of Disease
  • 30. Iceberg Concept of Disease
  • 31. References • Park’s Textbook of Preventive & Social Medicine – 23rd Edition • www.googleimages.com

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