Principles of Disease
Objectives for the course
Fall 2005
INTRODUCTION
By the end of the course, you
should be able to accomplish the following objectives. Each section of the
objectives tells you where you can go in the textbook to find information to
help you answer the objectives. In addition to these specific page numbers,
don’t forget that the index and glossary are valuable tools to
help find individual words and phrases. Those objectives marked with an
asterisk (*) can be answered completely from information in the textbook and you
are expected to do these on your own, since they will not be discussed in
lecture. If time does not permit to answer all of the objectives before a test,
you are required to answer them on your own! At any point during the course,
certain objectives may be required of you that are not directly written in the
following pages. Most of the objectives listed can, and should, be answered by
seeking out the information in the textbook as well as in your lecture notes.
HOW TO USE THESE OBJECTIVES
These objectives should serve as your study
guide. They have been written to help you answer the question, “What do I need
to know for the examination?” It is NOT the test, but questions on the test may
be similar.
The objectives can also serve as a course
outline, since they show what we will be covering throughout the semester. At
any time during the semester, you should be able to see where we are and where
we are going by finding the current object being covered.
The objectives are intended as a way to help you
integrate information you have found in your textbook with what you have written
in your lecture notes. DO NOT USE THEM AS AN OUTLINE FOR TAKING NOTES IN
LECTURE. You should take notes in lecture as you do in other courses,
writing them down in your notebook as accurately and fully as possible. In
filling out the objectives, you should ask yourself, “What do my lecture notes
say about this? What does the textbook say about this?” and use this
information to write down the answers to the objectives.
Chapter 1—Introduction to Pathophysiology (pgs 2-11)
- Define the following terms: pathophysiology,
pathology, biopsy, autopsy, diagnosis, etiology, idiopathic etiology,
iatrogenic etiology, predisposing factors, prevention, pathogenesis, onset of
disease, acute onset of disease, insidious onset of disease, acute disease,
chronic disease, subclinical state, latent state, prodomal period,
manifestations of disease (both local and systemic), signs, symptoms, lesion,
syndrome, diagnostic tests, remissions, exacerbations, precipitating factor,
complications, therapy, sequelae, convalescence, prognosis, morbidity,
mortality, epidemiology, epidemic, pandemic, incidence of disease,
communicable disease, notifiable/reportable disease. Be able to give
examples where applicable.
- Describe cellular adaptations.
- List and describe the terms used for common changes in
cells. Give an example for each.
- List and describe ways to damage cells
- Define: ischemia, necrosis, hypoxia
- List and describe the cell damage (both initial and
necrosis).
- List and describe the various types of necrosis.
Chapter 2—Inflammation and Healing (pg 12-33)
- Distinguish between nonspecific and specific body
defenses
- Review normal capillary exchange.
- Describe inflammation
- Definition
- Causes
- Is it the same as an infection?
- Describe the pathophysiology of acute inflammation.
- Describe the local effects of acute inflammation.
- List and describe the types of inflammatory exudates.
- Describe the systemic effects of acute inflammation.
- List and describe the diagnostic tests used for
inflammation.
- Describe the course of the inflammatory response.
- List and describe the potential complications of acute
inflammation.
- Describe chronic inflammation pathophysiology.
- *Compare and contrast acute and chronic inflammation.
- List and describe the drugs that treat inflammation.
- Describe other therapies that can treat inflammation.
- Describe the following types of healing:
- Resolution
- Regeneration
- Replacement
- 1st intention healing
- 2nd intention healing
- Describe the healing process
- List the factors that affect healing:
- Promoting healing
- Delaying healing
- List and describe the possible complications of healing
due to scar tissue formation.
- List causes of burns.
- List and describe the classification of burns.
- Describe BSA.
- Be able to calculate % of body surface used using the
Rule of 9s.
- List and describe the effects of a burn injury:
- Shock
- Respiratory problems
- Pain
- Infection
- Metabolic needs
- Describe burn treatments.
- Describe various methods of healing burns.
Chapter 3—Immunity and Abnormal Responses (Pg 34-59)
- Give the purpose of the immune system.
- Describe the immune response.
- *List the components of the immune system.
- *Define and describe antigens.
- *List and describe the types of cells that comprise the
immune system.
- Macrophages
- Lymphocytes
i.
B-cells
1.
Memory B
2.
Plasma cells
ii.
T-cells
1.
Killer T
2.
Helper T
3.
Memory T
4.
Suppressor T
iii.
Natural Killer cells
- *List and describe the various types of antibodies.
- *Describe the function of chemical mediators. Give some
examples.
- *Compare and contrast primary and secondary immune
response.
- List and describe diagnostic tests.
- Describe the ways in which immunity is acquired.
- Describe the four types of grafts.
- Describe the problem with tissue and organ transplants.
- Describe rejection in tissue and organ transplants.
- Why can infants get heart transplants without a good
match?
- Describe the two types of rejection.
- Describe:
- Hyperacute rejection
- Acute rejection
- Chronic rejection
- Describe why immunosuppressant therapy is given to
tissue/organ recipients.
- Define: antigen. List some examples.
- Describe the causative mechanism of allergies.
- Describe the various types of allergies:
- Hay fever
- Food allergies
- Eczema
- Asthma
- Describe anaphylactic shock:
- Pathophysiology
- Clinical signs and symptoms
- Describe various treatments of allergies:
- Skin tests/shots
- Antihistamine
- Glucocorticoids
- Define: autoimmune disease.
- Describe the mechanism of autoimmune diseases.
- Describe the pathophysiology of systemic lupus
erythematosus.
- Describe the clinical signs and symptoms of SLE.
- Describe the diagnostic tests for SLE.
- Describe the treatment of SLE.
- Define: immunodeficiencies.
- Describe primary and secondary immunodeficiencies.
- Describe the effects of immunodeficiency.
- Describe AIDS:
- Pathophysiology
- Why can’t the antibodies destroy all of the viral
cells?
- Transmission
- Diagnostic tests
- Clinical signs and symptoms
- Treatment
Chapter 4—Infection (pgs 62-81)
- Define: microbiology.
- List types of microorganisms.
- Describe bacteria:
- Classification
- Structure
- Replication
- Define: obligate.
- Describe viruses:
- Structure
- Replication
- Mutation
- And why they are difficult to control.
- Describe the 2 forms of chlamydiae and diseases that are
caused by it.
- Describe how rickettsia is contracted and the diseases
that it causes.
- Describe mycoplasma.
- Describe fungi
- Structure
- Pathogenic types
i.
Diseases caused.
- Describe protozoa.
- Structure
- Pathogenic types
i.
Diseases caused
- Describe helminthes.
- Structure
- Life cycle
- Types
- Describe what is meant by resident flora.
- List various places in which resident flora can be found
in a healthy individual.
- List various places in which resident flora should not
be found.
- Define and describe reservoir.
- List and describe modes of transmission from reservoir
to new host.
- List factors that decrease host resistance.
- Define: pathogenicity, virulence.
- Describe the 4 things that virulence is based on.
- List and describe ways to break the cycle and minimize
risk of infection.
- Describe the onset and course of an infection
- Incubation period
- Prodomal period
- Acute period
- Describe the local and systemic signs of an infection.
- List and describe diagnostic tests used for infection.
- List and describe the guidelines for antimicrobial use.
- List and describe the classification of drugs for
infection.
- Distinguish between: bactericidial and
bacteriostatic; narrow vs. broad spectrum.
- Describe the mode of action of:
- Antibacterial drugs
- Antiviral drugs
- Antifungal agents.
- Describe Influenza:
- RNA or DNA?
- Effects
- Common secondary infection
- Signs and symptoms
- Treatment
- At risk groups
Chapter 5—Neoplasms (pgs 84-103)
- *Review normal cells.
- Define: atypical and neoplasm.
- Describe the nomenclature of neoplasms. Give examples.
- List and describe the characteristics of benign tumors.
- List and describe the characteristics of malignant
tumors.
- *Compare and contrast benign and malignant tumors.
- Describe the pathophysiology of malignant tumors.
- Define: in situ.
- Describe the effects of malignant tumors.
- List and describe the local effects of tumors.
- List and describe the systemic effects of cancer.
- List and describe diagnostic tests for cancer.
- List and describe the 3 basic mechanisms for spreading
of malignant tumors.
- Describe the classification process of staging cancer.
- When is cancer staged?
- *Describe the 4 stages of breast cancer from Table 5-3
on pg 92.
- Describe the etiology of cancer.
- Carcinogenesis
i.
Stages of carcinogenesis
- Risk factors and prevention
- Host defenses
- Describe the various methods of treating cancer.
- Curative
- Palliative
- Prophalytic
- Surgery
i.
Why are the lymph nodes removed as well?
- Chemotherapy
i.
What it consists of
ii.
How it works
iii.
Methods of administration
iv.
Adverse effects
- Radiation
i.
What is consists of
ii.
How it works
iii.
Methods of administration
iv.
Adverse effects
- Other drugs (functions)
i.
Hormones
ii.
Biologic response modifiers
iii.
Angiogenesis inhibitor drug
iv.
Analgesics
- Nutrition
- Define: cure in relation to cancer.
- Describe prognosis in relation to cancer.
- Describe:
- Skin cancer
- Ovarian cancer
- Brain tumors
Chapter 6—Fluid, Electrolyte, and Acid-Base
Imbalances (pgs 104-127)
- Review of fluid balance
- Fluid compartments
- Movement of water
i.
Filtration
ii.
Osmosis
iii.
Osmotic pressure
iv.
Hydrostatic pressure
- Control of fluid balance through:
i.
Hypothalamus
ii.
ADH
iii.
Aldosterone
- Describe the 3 types of excess fluid that occurs in the
extracellular compartment.
- Describe edema:
a.
Causes of edema
b.
Effects of edema
- Describe dehydration:
a.
Isotonic
b.
Hypotonic
c.
Hypertonic
d.
Causes of dehydration
e.
Effects of dehydration
- Describe what is meant by “third-spacing”.
- Review of sodium ions
a.
Location
b.
Types of transport
c.
Forms it exists in
d.
Ingestion
e.
Controls
f.
Importance of maintaining levels
- Describe hyponatremia
a.
Serum level
b.
Causes
c.
Effects
- Describe hypernatremia
a.
Serum levels
b.
Causes
c.
Effects
- Review of potassium ions
a.
Location
b.
Ingestion/excretion
c.
Acidosis/alkalosis
d.
Importance of maintaining levels
- Describe hypokalemia and hyperkalemia:
a.
Serum levels
b.
Causes
c.
Effects
- Review of calcium ions:
a.
Location
b.
Ingestion/excretion
c.
Controls of balance
d.
Important functions
- Describe hypocalcemia and hypercalcemia:
a.
Serum levels
b.
Causes
c.
Effects
- Review of acid-base balance
a.
Importance of maintaining
b.
Acidosis
c.
Alkalosis
d.
Nonvolative metabolic needs
- List and describe the mechanisms of controlling serum
pH.
a.
Buffer systems
i.
Bicarbonate-carbonic acid buffer system
b.
Respiratory system
c.
Renal system
- Describe acid-base imbalances
a.
The 4 types
b.
Compensation
c.
Decompensation
d.
Acidosis:
i.
Causes
1.
respiratory acidosis
2.
metabolic acidosis
ii.
Effects
e.
Alkalosis:
i.
Causes
1.
respiratory
2.
metabolic
ii.
Effects
Chapter 16—Introduction to Basic Pharmacology and
Selected Therapies (218-230)
- Define: pharmacology.
- List the two sources of drugs.
- Define: drug.
- List the reasons that drugs are prescribed. Provide an
example for each reason.
- Describe the 3 types of drug effects.
- Know the difference between indications and
contraindications.
- Know the difference between side effects and adverse
effects.
- List and describe the specific forms of adverse effects.
- Define: synergism, antagonism, potentiation.
- Define: dosage.
- Know the factor that is important in maintaining
appropriate blood levels.
- Know the three factors that dosage scheduling is based
on.
- List and describe all factors that affect blood levels
of the drug.
- List the routes for administration.
- Describe drug circulation.
- Describe drug absorption, distribution, and excretion.
- List the natural substances that receptors respond to.
- List the 2 types of receptor sites in cells or on cell
membranes.
- Define: prescription.
- List the information that a prescription must contain.
- Describe the names for drugs.
- Describe the role of the FDA.
- Describe official schedules.
- Describe the process of clinical research.
- Describe the roles of the following in the healing
process:
- Physiotherapist
- Occupational therapist
- Speech/language pathologist
- Nutritionist/dietitian
- Describe what is meant by “alternative therapies”.
- Define: holistic approach.
- Describe the following alternative therapies in the
healing process:
- Osteopathy
- Chiropractic
- Homeopathy
- Aromatherapy
- Describe what the Asian concept of disease is based on.
- List the three sources that qi is derived from.
- Define: yin, yang.
- Describe meridians and acupoints.
- Describe acupuncture.
Chapter 13—Pain (pgs 190-201)
- List several causes of pain.
- Describe the pain pathway.
- Describe why pain is not easily understood.
- Describe the theory of pain
- Gate control theory
i.
Open gates
ii.
Closed gates
- Describe opioid function. List some examples.
- List some details useful in diagnosing the severity and
cause of pain.
- Define: referred pain.
- List and describe factors that affect pain perception
and response.
- List the characteristics of acute pain.
- List the characteristics of chronic pain.
172.
For each of the following types of headache: be able to determine the
location of origin, cause, effects.
- Sinus headache
- Tension headache
- TMJ syndrome
- Migraines
- Intracranial headaches
173.
Describe methods for managing pain. Know some medications for each type
of pain
- Mild
- Moderate
- Severe
- Describe the different types of anesthesia.
Chapter 7—Congenital and Genetic Disorders (pgs
132-143)
175.
Define: chromosomes, autosomes, karyotype, meiosis, genes, allele,
genotype, mitosis, mutation.
- Define: congenital defect.
- List the three types of genetic disorders.
178.
Describe how single gene disorders are classified. Make sure to include
the names of the classifications. Know some examples of diseases of each type of
single gene disorders.
- Is there a risk present for each pregnancy?
- Is the effect limited or widespread?
- Be able to do or interpret a Punnett square for each
type of single gene disorder.
- Chromosomal defects
- Know some examples
- Describe what leads to these defects.
- Multifactoral defects
- Know some examples
- Describe what they are.
- Be able to interpret a family pedigree.
- Describe developmental disorders.
- Define: teratogen
- Know the time period that is essential to embryonic
development.
i.
Know why that time period is essential.
183.
List and describe diagnostic tools used for congenital and genetic
disorders. Include an example of what the tool would test for.
- Screening programs
- Prenatal screening—list types
- Neonate screening
- Describe the process of genetic engineering and gene
therapy.
185.
List some possible causes of Down’s syndrome and why the chances increase
with maternal age.
- List some physical characteristics of Down’s syndrome.
Chapter 18—Cardiovascular Disorders (pgs 258-308)
- List and describe the types of diagnostic tests for
cardiovascular function.
- List and describe the general treatment measures for
cardiac disorders.
- List and describe the types of drug therapy for cardiac
disorders.
- Describe the pathophysiology of arteriosclerosis.
- Describe atherosclerosis:
- Pathophysiology
- Etiology
- Diagnostic tests
- Treatment
- Describe MI:
- Pathophysiology
- Signs and symptoms
- Diagnostic tests
- Complications
- Treatment
- Describe cardiac arrhythmias.
- Describe sinus node abnormalities.
- Describe atrial conduction abnormalities.
- Describe treatment of cardiac arrhythmias.
- Describe cardiac arrest.
- Describe CHF:
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe hypertension:
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe shock:
a.
Pathophysiology
b.
Etiology
i.
*Compare and contrast the 4 types
c.
Signs and symptoms
d.
Treatment
Chapter 17—Blood and Lymphatic Disorders (pgs
232-257)
- List and describe the blood diagnostic tests.
- List and describe types of blood therapies.
- Describe the results of oxygen deficiency.
- Describe iron deficiency anemia:
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe sickle cell anemia:
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnosis
- Treatment
- Describe blood clotting disorders:
- Warning signs
- Causes of excessive bleeding
- Describe leukemia:
- Pathophysiology
i.
Acute vs. chronic leukemia
ii.
Types of leukemia
- Etiology
- Signs and symptoms
i.
Acute
ii.
Chronic
- Diagnostic tests
- Treatment
- Describe lymphoma
- Hodgkin’s vs. non-Hodgkin’s
- Pathophysiology
- Staging
- Signs and symptoms
- Treatment
Chapter 19—Respiratory Disorders (pgs 310-360)
- List and describe the types of diagnostic tests.
- List and describe the general manifestations of
respiratory disease.
- List the causes of hypoxia.
- Describe the common cold.
- Describe sinusitis.
- Describe bronchiolitis.
- Describe pneumonia:
- Classification
- Stages
- Manifestations
- Treatment
- Describe lung cancer:
- Types
- Pathophysiology
- Effects of tumors
- Etiology
- Signs and symptoms
i.
Categories
- Diagnostic tests
- Treatment
- Describe asthma:
- Pathophysiology
i.
Acute attack
ii.
Extrinsic asthma
iii.
Partial obstruction
iv.
Total obstruction
- Etiology
- Signs and symptoms
- Treatment
- Describe COPD.
- Describe emphysema:
- Pathophysiology
i.
Contributing factors
ii.
Effects of tissue changes on lung function
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe chronic bronchitis:
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
Chapter 20—Digestive System Disorders (362-419)
- Describe the common manifestations of digestive system
disorders
- Anorexia
- Nausea
- Vomiting
- Diarrhea
i.
Classification
- Constipation
- Pain
- Malnutrition
- List and describe the basic diagnostic tests.
- List and describe the common therapies.
- List and describe drug treatment.
- Describe a hiatal hernia:
- The 2 types
- Contributing factors
- Signs
- Describe gastroesophageal reflux disease
- Describe gastroenteritis.
- Describe peptic ulcers:
- Distinguish between gastric and duodenal ulcers
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe gallstones:
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe viral hepatitis
- Pathophysiology
- Etiology
i.
HAV
ii.
HBV
iii.
HCV
iv.
HDV
v.
HEV
- Signs and symptoms
- Treatment
- Describe colorectal cancer
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
Chapter 25—Endocrine Disorders (pgs 524-548)
- Describe diagnostic tests
- Describe treatment
- Describe insulin and diabetes mellitus
- Compare type I and type II diabetes
- Pathophysiology
i.
Initial stage
ii.
Progressive effects
- Signs and symptoms
- Diagnostic tests
- Various treatment methods
- Complications
i.
Acute complications
1.
hypoglycemia
2.
diabetic ketoacidosis
ii.
chronic
1.
vascular problems
2.
neuropathy
3.
infections
4.
cataracts
5.
pregnancy
Chapter 21—Urinary System Disorders (pgs 420-445)
- Define and describe incontinence.
- Define and describe retention.
- Describe the function of a catheter.
- Describe the various diagnostic tests:
a.
Urinalysis
b.
Blood tests
c.
Other tests
- Describe the function of diuretic drugs.
- Describe the function of dialysis.
- List and describe the 2 types of dialysis.
- Describe a urinary tract infection:
a.
Etiology
b.
Cystitis
i.
Pathophysiology
ii.
Signs and symptoms
c.
Pyelonephritis
i.
Pathophysiology
ii.
Signs and symptoms
d.
Treatment
- Describe glomerulonephritis:
a.
Pathophysiology
b.
Signs and symptoms
c.
Diagnostic tests
d.
Treatment
- Describe urolithiasis:
a.
Pathophysiology
b.
Signs and symptoms
c.
Treatment
- Describe renal cell carcinoma.
- Describe acute renal failure:
a.
Pathophysiology
b.
Etiology
c.
Treatment
- Describe chronic renal failure:
a.
Pathophysiology
b.
Signs and symptoms
c.
Diagnostic tests
d.
Treatment
Chapter 26—Musculoskeletal Disorders (pgs 550-571)
- Describe diagnostic tests
- Describe fractures
- Classification
- Pathophysiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe dislocations
- Describe sprains and strains
- Describe osteoporosis
- Pathophysiology
- Etiology
- Treatment
- Describe osteoarthritis
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe rheumatoid arthritis
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
Chapter 28—Reproductive System Disorders (pgs
592-622)
- Describe infertility in males
- Describe benign prostatic hypertrophy
- Pathophysiology
- Signs and symptoms
- Treatment
- Describe prostate cancer
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe infertility in females
- Describe structural abnormalities in females
- Describe endometriosis
- Describe pelvic inflammatory disease
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe ovarian cysts
- Describe breast cancer
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe cervical cancer
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe uterine cancer
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
Chapter 22—Acute Neurologic Disorders (pgs 446-487)
- Be able to describe the general effects of neurologic
dysfunction
- Local (focal) effects
- Supratentorial and infratentorial lesions
- Right and left hemispheres
- Level of consciousness
- Motor dysfunction
- Sensory deficits
- Visual loss
- Language disorders
- Seizures
- Increased intracranial pressure
i.
Early signs
ii.
Vital signs
iii.
Visual signs
iv.
Changes in CSF
- Herniation
- Be able to describe diagnostic tests.
- Describe brain tumors
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe the following vascular disorders:
- Cerebrovascular accidents
i.
Pathophysiology
ii.
Etiology
iii.
Treatment
- Cerebral aneurysms
i.
Pathophysiology
ii.
Signs and symptoms
iii.
Treatment
- Describe meningitis
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe head injuries
- The various types
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe spinal cord injuries
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
Chapter 23—Chronic Neurologic Disorders (pgs 488-507)
- Describe cerebral palsy
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Seizure disorders
- Pathophysiology
- Etiology
- Signs and symptoms
i.
Generalized seizures
ii.
Partial seizures
- Treatment
- Describe multiple sclerosis
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe Parkinson’s disease
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe Huntington’s disease
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
- Describe Alzheimer’s disease
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe schizophrenia
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe depression
- Pathophysiology
- Signs and symptoms
- Treatment
- Describe panic disorder
- Pathophysiology
- Signs and symptoms
- Treatment
- Describe herniated intervertebral discs
- Pathophysiology
- Etiology
- Signs and symptoms
- Diagnostic tests
- Treatment
Chapter 24—Disorders of the Eye and Ear (pgs 508-522)
- Describe the types of diagnostic tests for eyes
- Describe the various types of structural defects that
occur in the eye
- Describe infections and trauma
- Conjunctivitis
- Stye
- Trauma to cornea
- Describe glaucoma
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe cataracts
- Describe detached retina
- Describe macular degeneration
- Describe hearing loss and differentiate between the two
types
- Describe otitis media
- Pathophysiology
- Etiology
- Signs and symptoms
- Treatment
- Describe otitis externa.