CPR APPLICATIONS FOUNDATION · CHAPTER 12 · ABNORMAL
Abnormal Foundations of Infectious Disease
Organize the chapter before drilling into individual CPR concepts.
Supplemental foundation map: this page orients the detailed CPR Applications for Chapter 12. It is not part of the canonical CPR object inventory.
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Normal Foundations
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Treatment Foundations
12.18 · SOURCE CPR FOUNDATION
Concept
Clinical infection develops when normal barriers are breached, immune containment fails, or microbial virulence overwhelms host defenses. Disease is not just organism presence. It requires invasion, toxin effect, inflammation, immune failure, or clinically meaningful tissue injury.
Pattern
Step 1 presents infection after surgery, trauma, burns, catheter placement, aspiration, antibiotic exposure, chemotherapy, HIV progression, anti-TNF therapy, or immunosuppression. These contexts reveal which protection failed. The broken barrier often explains the pathogen and the management step.
Rule
- Find the broken barrier. Skin, mucosa, airway protection, catheter access, flora balance, and granuloma integrity are common failure points.
- Find the impaired immune function. Neutrophils, T cells, antibodies, complement, and spleen function each protect against different organisms.
- Use the failure point to predict infection behavior. Local invasion, dissemination, reactivation, or opportunism follows.
Applications
- Burns → loss of skin barrier
- Aspiration → failed airway protection
- Catheter → direct bloodstream access
- Antibiotics → loss of normal flora
- Chemotherapy → neutropenia
- TNF inhibition → impaired granuloma maintenance and increased risk of reactivating latent tuberculosis; screen and manage risk before treatment
- HIV → progressive cell-mediated immune failure
- Tip: Infection often starts with the defense that failed
CPR APPLICATIONS · ACTIVE REASONING
Identify failed host defenses
Make a prediction first. Each worked answer is available without JavaScript. These exercises do not save or send responses.
Worked reasoning and transfer
Best answer: Epithelial barrier integrity. Disruption permits microbial entry.
Transfer: Which organisms may colonize damaged skin?
Worked reasoning and transfer
Best answer: Impaired granuloma maintenance. TNF participates in control of latent TB and granuloma function.
Transfer: What should be evaluated before anti-TNF therapy?
Worked reasoning and transfer
Best answer: Direct device-associated access and possible biofilm. A device can bypass skin barrier and support adherent organisms.
Transfer: Why might device management matter?
Explain it back: Write a causal chain for one decision, then identify which piece of evidence would change the answer.
Unscored teaching examples; not validated assessment items or patient-specific advice.
How to use this foundation map
- Identify the organizing mechanism.
- Recognize the pattern.
- Restate the rule without looking.
- Test transfer with applications and question practice.
Pair CPR with the 5P Approach™ when solving cases and questions.