13 results
Important Biostatistics and Epidemiology Equations

Sensitivity = TP / (TP + FN) = true positives / disease
Specificity = TN / (FP ... Value = TP / (TP + FP ... Epidemiology #Equations #calculations ... #specificity #PPV ... #NPV
Fundic gland polyps on Endoscopy
46 yo F. with hx of 8 months of abdominal pain with
treatment with PPI ... Dysplasia <1%, FAP ... multiple polyps - FGP ... patients with FAP ... gland #polyps #FGP
Positive Predictive Value Calculation - Probability that someone with a positive test actually has the disease

Positive
Predictive Value Calculation ... Value = TP / (TP + FP ... PositivePredictiveValue #PPV ... Epidemiology #Equations #calculations
Persistent UC Symptoms Despite 5-ASA Therapies
 • Assess for Drug Adherence
 • Disease Activity Assessment (bloody
non-bloody diarrhea) • FCP ... • Observation (FCP ... JAK Inhibitor Algorithm ... Treatment #Management #Algorithm
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
it has a narrow focus ... NegativePredictiveValue #Calculation ... #Table #PPV #NPV
USMLE Epidemiology and Biostatistics Summary
Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
negative: TN / (TN + FP ... ) = 1 - FP. ... positives: TP / (TP + FP ... specificity -> higher PPV ... Biostatistics #formulas #calculations
Specificity Calculation - Probability that a test correctly identifies those without the disease (true negative rate)

Specificity
Specificity Calculation ... Specificity = TN / (FP ... Epidemiology #Equations #calculations
Relapsing Acute Severe Ulcerative Colitis - Management Algorithm
Loss of Response:
 • (Re)consult Colorectal Surgery
 • Assess
Colitis - Management Algorithm ... Activity: Flex Sig, FCP ... PJP Prophylaxis Algorithm ... UC #Management #Algorithm
Thromboelastography (trademarked as TEG)
 • Graphical representation of the fibrin polymerization process
 • Point-of-care anti-coagulation monitoring
routine transfusion algorithms ... deficiency → give FFP
Thiopurine De-escalation and IBD - Management Algorithm
IBD Patient on Thiopurine Interested in Discontinuing Thiopurine
Assess Disease Activity:
IBD - Management Algorithm ... Bowel Imaging/VCE, FCP ... for Thiopurine Algorithm ... Deescalation #IBD #algorithm