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Kristina Shared "MF2 Review Week" - 151 Picmonics

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MF2 Review Week

Sensitivity
Characteristics
Rules Out
Screening Test
Formula
TP / (FN+TP)
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2 mins
Specificity
Characteristics
Rules In
Confirmatory Test
Formula
TN / (TN + FP)
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1 min
Case Control Study
Observational
Retrospective
Compares those with disease to those without
(Asks) "What happened?"
Measurement
Odds Ratio
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47 secs
Cohort Study
Observational
Longitudinal
Studies risk from exposure
Retrospective
(Asks) "Who developed disease?"
Prospective
(Asks) "Who will develop disease?"
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1 min
Cross-Sectional Study
Observational
(Asks) "What's Happening?"
Data at One Specific Point in Time
(Finds) Frequency of Disease
Measurement
Prevalence
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49 secs
Quantifying Risk: Contingency 2x2 Table Setup
Disease
Along Top (x axis)
Exposure
Along Side (y axis)
A: Exposed and Diseased (Sick)
B: Exposed and Healthy
C: Not Exposed and Diseased (Sick)
D: Not Exposed and Healthy
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2 mins
Odds Ratio (OR)
Use
Case Control Studies
Measures Association Between an Exposure and an Outcome
Formula
Odds of Exposure in Diseased (Sick) Group
a / c
Divided /
Odds of Exposure in Healthy Group
b / d
Interpretation
=1 Exposure does not affect odds
> 1 Exposure increases disease
< 1 Exposure decreases disease
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2 mins
Attributable Risk (AR)
Use
Proportion Exposure Increases Disease
Formula
Incidence of Diseased (Sick)
Equals =
Exposed Group
a / (a + b)
Minus -
Unexposed Group
c / (c + d)
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1 min
Relative Risk (RR)
Use
Used in Cohort Studies
Formula
Risk of Developing Disease
Equals =
Exposed Group
a / (a + b)
Divided by /
Unexposed Group
c / (c + d)
When Low Prevalence Odds Ratio Approximates Relative Risk
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2 mins
Positive Predictive Value (PPV)
Proportion of Positive Tests that are True Positive
Probability that Person with Positive Test has Disease
Formula
TP (True Positives)
Divided by /
All Positive Test Results
TP + FP
Considerations
Varies Directly with Prevalence
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1 min
Negative Predictive Value (NPV)
Proportion of Negative Tests that are Truly Negative
Probability that Person with Negative Test is Healthy
Formula
(TN) True Negatives
Divided by /
All Negative Test Results
(FN + TN)
Considerations
Varies Inversely with Prevalence
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1 min
Common Statistical Tests
Determine If Comparing Numerical Or Categorical Variables
Numerical Variables
T-Test For Comparing Means Of Two Groups
ANOVA For Comparing Means In Greater Than Three Groups
Comparing Mean Values On Normal/Bell Distribution
Categorical Variables
Chi-Squared Test For Comparing Categorical Outcomes In Large Sample Sizes
Fisher's Exact Test For Comparing Categorical Outcomes In Small Sample Sizes
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4 mins
Scientific Bias Types
DEFINITION
Bias
RECRUITING PARTICIPANTS
Selection Bias
Berkson Bias
Attrition Bias
PERFORMING STUDY
Recall Bias
Measurement Bias
Procedure Bias
Observer-expectancy Bias
INTERPRETING RESULTS
Confounding Bias
Lead-time Bias
Length-time Bias
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6 mins
Sickle Cell Anemia (Mechanism)
Intrinsic Normocytic Hemolytic Anemia
Point Mutation
Autosomal Recessive
African American
Dehydration or Decreased O2
Newborns Asymptomatic
Heterozygote Malarial Resistance
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2 mins
Sickle Cell Anemia (Signs and Complications)
Signs
Crew-cut on Skull X-ray
Complications
Auto-splenectomy
Painful Crisis
Aplastic Crisis
Splenic-sequestration Crisis
Hyper-hemolytic Syndrome
Renal Papillary Necrosis
Salmonella osteomyelitis
Pulmonary Hypertension
Hyposthenuria
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2 mins
Beta Thalassemia
Mechanism
Microcytic, Hypochromic Anemia
Mediterranean Populations
Decreased Beta-Globin
Beta-Thalassemia Minor
Increased HbA2
No Intervention
Beta-thalassemia Major
Blood Transfusions
Hemochromatosis
Crew-cut on Skull X-Ray
Diagnosis
Electrophoresis
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2 mins
Chronic Myelogenous Leukemia (CML)
Pathophysiology
BCR-ABL
9;22 Translocation
Philadelphia Chromosome
Signs & Symptoms
Tyrosine Kinase
Low Alkaline Phosphatase
Splenomegaly
Considerations
Blast Crisis
Age 30 to 90 Years
Responds to Imatinib
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3 mins
Myotonic Dystrophy
Pathophysiology
Autosomal Dominant
Trinucleotide Repeat
CTG
Signs and Symptoms
Facial Muscle Weakness
Frontal Balding
Sustained Grip
Conduction Defects
Cataracts
Selective Atrophy of Type 1 Fibers
Testicular Atrophy
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2 mins
Autosomal Dominant Polycystic Kidney Disease
Characteristics
Autosomal Dominant
Mutations in PKD1/2
Cystic Enlargement of Renal Tubules
Clinical Features
Chronic Kidney Disease
Hypertension
Mitral Valve Prolapse
Hepatic Cysts
Berry (Saccular) Aneurysms
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3 mins
G6PD Deficiency
X-linked Recessive
Hemolytic Anemia
Inflammatory Response
Fava Beans
Sulfonamides
Primaquine
Anti TB Drugs
Heinz Bodies
Bite Cells
Prevalent Among African Americans due to Increased Malarial Resistance
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2 mins

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