General IM Flashcards
Calculated as (all true-positive test results) / (true-positive and false-negative test results)
Sensitivity
Calculated as (all true-negative results) / (true-negative and false-positive results)
Specificity
Calculated as (true-positive test results) / (all positive test results)
Positive predictive value
Calculated as (true-negative test results) / (all negative test results)
Negative predictive value
The probability that the patient has the disease if the test is positive
Positive predictive value
The probability that the patient does not have the disease if the test is negative
Negative predictive value
A receiver operating characteristic curve is a graph of this relationship between sensitivity and specificity
Sensitivity vs. (1 - specificity)
it is a graph of the true-positive rate [y] vs. false-positive rate [x]
Direction of change in positive predictive value as prevalence of the disease increases
Increases
Direction of change in negative predictive value as prevalence of the disease increases
Decreases
A measurement of the odds of having a disease independent of the disease prevalence
Likelihood ratio
Formula for positive likelihood ratio
Sensitivity / (1 - specificity)
Formula for negative likelihood ratio
(1 - sensitivity) / specificity
A likelihood ratio of 2 increases the probability of disease by approximately this percentage
15%
A likelihood ratio of 5 increases the probability of disease by approximately this percentage
30%
A likelihood ratio of 10 increases the probability of disease by approximately this percentage
45%
A likelihood ratio of 0.5 decreases the probability of disease by approximately this percentage
15%
A likelihood ratio of 0.2 decreases the probability of disease by approximately this percentage
30%
A likelihood ratio of 0.1 decreases the probability of disease by approximately this percentage
45%
In this study design, the presence of the presumed risk factor and presence of the outcome are measured at the same time in a population
Cross-section
In this study design, subjects are divided into groups based on the presence or absence of the outcome of interest and then the frequency of risk factors in each group is compared
Retrospective (case control)
In this study design, subjects are divided into groups based on the presence or absence of the presumed risk factor and followed for a period of time; frequency of the outcome is compared at the end of the study
Prospective (cohort)
In this study design, subjects are randomly divided into groups; one group receives the intervention and followed forward in time; frequency of the outcome is compared at the end of the study
Randomized controlled trial
In this study, multiple small clinical trials using similar randomization techniques and interventions are combined into one large analysis to address very precise clinical questions
Systematic review
The difference in absolute risk of patients who received the intervention and those who did not
Absolute risk reduction (ARR)
The ratio of the absolute risk of patients who received the intervention and those who did not
Relative risk
A type of relative risk (RR) that calculates the risk of an outcome in a group exposed to a risk compared with a control group not exposed to the risk
Hazard ratio
Calculated as (1 / absolute risk reduction)
Number needed to treat
A type of error wherein it is incorrectly concluded that a statistically significant difference exists between the experimental and control groups
Type I error
A type of error wherein it is incorrectly concluded that no difference exists between the experimental and control groups
Type II error
A study that uses a P value of <0.5 will have this chance of type I error
<5%
Smoking cessation reduces all-cause mortality by up to this percentage
50%
This pharmacologic therapy increases smoking cessation rates about 3.5 times more than control; it has been associated with suicidal ideation and increased risk of cardiovascular events
Varenicline
This pharmacologic therapy increases smoking cessation rates about 2 times more than control; should be avoided with seizure disorder and eating disorder; may be associated with suicidal ideation
Buproprion
HPV vaccines are indicated in male and female patients of this age regardless of sexual activity, presence of genital warts, or previous postiive HPV infection
9-26 years
Inactivated influenza vaccine is contraindicated in patients with allergy to this food
Eggs
Inactivated influenza vaccine is contraindicated in patients with a history of this neurologic condition
Guillain-Barré syndrome
Vaccine indicated in smokers
Pneumococcal vaccine
Tdap vaccine is given to patients with a dirty wound if this number of years has elapsed since primary series
> 5 years
Yellow fever vaccine is indicated for patients travelling to these regions (2)
Africa and South America
Meningococcal vaccine is indicated for patients travelling to this region
Sub-Saharan Africa
Frequency of blood pressure screening in the general population
Every 2 years
Screen for diabetes mellitus if blood pressure is at this level
> 135/80 mmHg
Starting age and frequency of screening total and HDL cholesterol
Men 35 years, women 45 years
Every 5 years
Starting age and frequency of screening mammogram with or without clinical breast examination
50 years, every 1-2 years
Starting age and frequency of screening Pap test
21 years, every 3 years until age 65
Frequency of screening when Pap test is combined with HPV testing
Every 5 years
Abdominal aortic aneurysm screening recommendation
One-time screening for men 65-75 years of age who have ever smoked
Chlamydia screening is recommended for sexually active women of this age
24 years or less
may also screen older at-risk women
Starting age to screen for bone mineral density
Women 65 years
(<65 years if fracture risk is equal to or greater than that of a 65-year old white woman who has no additional risk factors for fracture using the WHO FRAX algorithm)
Most common causes of secondary obesity (3)
Hypothyroidism, Cushing syndrome, polycystic ovary syndrome
BMI definition of overweight
25-29.9
BMI definition of obese class I
30-34.9
BMI definition of obese class II
35-39.9
BMI definition of obese class III
40 or more
Average weight reduction with orlistat
2.9 kg
Drug treatment for obesity is offered if this threshold in weight loss is not reached by the end of 3 months using dietary and exercise interventions
5%
A selective serotonin receptor agonist that induces the feeling of early satiety; associated with average weight loss of 5.8 kg and improvement in glycemic control
Locaserin
This combination of an appetite suppressant and an anticonvulsant with a weight-loss effect has been approved for pharmacological treatment of obesity
Phentermine-topiramate
Indications for the use of locaserin or phentermine-topiramate for obesity
BMI 30 or more, or 27 with 1 or more obesity-related comorbidity
Indications for bariatric surgery
BMI >40, or >35 with serious obesity-related comorbidities (severe sleep apnea, diabetes, severe joint disease)
Mortality reduction with bariatric surgery
29%
Most common cause of involuntary weight loss in the young
Malignancy
Most common causes (4) of involuntary weight loss in extended care facilities
Depression, medications, dehydration, issues related to dementia
Vitamin deficiencies (2) associated with coiled, corkscrew hair
Vitamins A and C
Vitamin deficiency associated with skin desquamation
Riboflavin
Vitamin deficiency associated with petechiae and perifollicular hemorrhage
Vitamin C
Vitamin deficiency associated with skin pigmentation, cracking, and crusting
Niacin
Vitamin deficiency associated with acro-orificial dermatitis (erythematous, vesiculobullous, and pustular)
Zinc
Vitamin deficiency associated with ophthalmoplegia and foot drop
Thiamine
Vitamin deficiency associated with memory disturbance and depressed vibratory and position senses
Vitamin B12
Gold standard for diagnosing white coat hypertension
Ambulatory BP measurement
Elevated blood pressure detected by ambulatory BP measurement but with normal office BP measurement; associated with increased risk of sustained hypertension and increased cardiovascular mortality
Masked hypertension
Cyclosporine-induced hypertension is a compelling indication for the use of this antihypertensive agent class
Calcium channel blocker
With an ACE inhibitor or ARB, an increase in serum creatinine by this percentage is acceptable and not a reason to discontinue therapy for hypertension
33%
GFR at which thiazide diuretics are not effective as antihypertensives
<30 mL/min/1.73 m2
Most readily modifiable risk factor for falls
Medications
Leading cause of drugs implicated in falls
Psychotropic agents
“Timed Up and Go” test associated with increased risk for falls
> 10 seconds (high risk if >14 seconds)
Supplementation of this vitamin reduces the frequency of falls in older patients who are deficient
Vitamin D
Duration of chronic cough
8 or more weeks
Most common causes (3) of chronic cough in patients who are nonsmokers, have a normal chest x-ray, and are not taking an ACE inhibitor
Upper airway cough syndrome (postnasal drip), asthma, and GERD
Before additional evaluation, patients with chronic cough should stop smoking and discontinue ACE inhibitors for this duration
4 weeks
Test for cough-variant asthma
Methacholine challenge
A 4-point criteria to stratify adult patients according to risk of group A streptococcal pharyngitis
Centor criteria
Components of the 4-point Centor criteria
Fever (subjective), absence of cough, tender anterior cervical lymphadenopathy, tonsillar exudates
(0-1: no testing/treatment; 2-3: do rapid antigen detection test or culture, but not both; 4: treat without testing)
Septic thrombophlebitis of the internal jugular vein resulting in metastatic pulmonary infections; caused by Fusobacterium necrophorum
Lemierre syndrome
Treatment for Fusobacterium necrophorum pharyngitis
Ampicillin-sulbactam
Treatment for streptococcal pharyngitis in patients allergic to penicillin
Macrolide
Acute bacterial sinusitis is defined as lasting for this duration
7 or more days
First-line choice for suspected bacterial sinusitis
Amoxicillin-clavulanate
Treatment for acute bacterial sinusitis in patients allergic to penicillin
Doxycycline
Indication for imaging tests such as CT in sinusitis
Immunocompromised condition (e.g., AIDS)
A Weber test that lateralizes to the bad ear is indicative of this type of hearing loss
Conductive hearing loss
sensorineural hearing loss if it lateralizes to the good ear
Rinne test result in conductive hearing loss
Bone conduction > air conduction
Most common cause of sudden sensorineural hearing loss
Idiopathic
Most common cause of malignant external otitis
Pseudomonas aeruginosa
Facial nerve paralysis, sensorineural hearing loss, and vesicular lesions on and in the ear canal caused by varicella-zoster virus
Ramsay Hunt syndrome
Most common cause of red eye
Viral conjunctivitis
Treatment for bacterial conjunctivitis
Topical fluoroquinolones or bacitracin-polymyxin
Giant papillary conjunctivitis with itching and watery discharge, and preauricular lymphadenopathy
Chlamydial conjunctivitis (treat with oral tetracycline, erythromycin, or doxycycline)
Chronic fatigue is defined as fatigue lasting for this duration
More than 1 month
Chronic fatigue syndrome is defined as persistent or relapsing fatigue lasting for this duration
At least 6 months
Superior among the two major BPH drug classes
Alpha-adrenergic blockers
First-line drugs for treatment of erectile dysfunction
Oral sildenail, vardenafil, or tadalafil
First-line therapy for premature ejaculation
SSRIs
Second-line therapy for premature ejaculation
Clomipramine
Treatment for erectile dysfunction when oral PDE-5 inhibitors are ineffective
Intraurethral alprostadil (if ineffective, give intracavernous alprostadil)
Core components (3) of decisional capacity
Understanding the situation at hand, understanding the risks and benefits of the decisions being made, and being able to communicate a decision
In this standard for decision making, the surrogate makes the decision that he or she believes the patient would have made
Substituted judgment standard
In this standard for decision making, the surrogate selects the medical treatment that he or she personally feels is best for the patient
Best interests standard
Reasoning error wherein the clinician who has encountered a similar presentation jumps to the conclusion that the current diagnosis must be the same as the previous
Availability heuristic
Reasoning error wherein the clinician accepts at face value a previous diagnosis made by another clinician
Anchoring heuristic
Reasoning error wherein there is acceptance of a diagnosis or plan made by another of higher authority
Blind obedience
Reasoning error wherein full differential diagnosis is not considered
Premature closure
Average number of system-related or cognitive factors that contribute to medical error in a single case
6