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GI-TBL
Aminoglycosides
Drug Names
Gentamicin
Neomycin for Bowel Surgery Prep
Amikacin
Tobramycin
Streptomycin
Mechanism of Action
Bactericidal
Inhibit Formation of Initiation Complex
Cause Misreading of mRNA
Require O2 for Uptake
Resistance
Resistance by Transferase Enzymes
Acetylation
Phosphorylation
Adenylation
Indications
Gram-Negative Rod Infections
Synergistic with B-Lactam Antibiotics
Side Effects
Nephrotoxicity Especially When Used with Cephalosporins
Ototoxicity Especially When Used with Loop Diuretics
Teratogen
5 mins
Bacillus Cereus Characteristics
Gram-Positive
Bacilli
Endospore Forming
B Hemolytic
Toxins and Enterotoxins
Reheated Rice
1 min
Bacillus Cereus Disease
Signs and Symptoms
Emetic Form
Short Incubation (1-6 Hours)
Nausea and Vomiting
Diarrheal Form
Long Incubation (8-16 Hours)
Diarrhea and GI Pain
2 mins
Campylobacter jejuni
Characteristics
Gram-Negative
Bacillus
Flagella
Curved
Corkscrew Appearance
Oxidase-Positive
Grows Well at 42 Degrees
Undercooked Meat
Unpasteurized Milk
Animals with Diarrhea
Signs and Symptoms
Bloody Diarrhea
Guillain-Barre syndrome
Reactive Arthritis
3 mins
Clostridioides difficile (Clostridium difficile)
Characteristics
Gram-Positive
Bacillus
Anaerobe
Clindamycin and Ampicillin
Toxin A Enterotoxin
Damages Brush Border of Gut
Toxin B Cytotoxin
Damages Cytoskeletal Structure
Signs and Symptoms
Diarrhea
Pseudomembranous Colitis
Toxic Megacolon
Diagnosis
Detect Toxins in Stool
Treatment
Metronidazole
Vancomycin
3 mins
Clostridium perfringens
Characteristics
Gram-Positive
Bacillus
Anaerobe
Spore-Forming
Alpha Toxin Lecithinase
Phospholipase
Heat Labile Enterotoxin
Signs and Symptoms
Myonecrosis
Gas Gangrene
Food Poisoning and Diarrhea
Treatment
Hyperbaric O2 Chamber
2 mins
Cryptosporidium
Characteristics
Protozoa
Ingestion of Oocysts in Food or Water
Acid Fast Cysts
Signs and Symptoms
Outbreaks of Diarrhea from Contaminated Water Supply
Mild Disease in Non-immunocompromised
Severe Diarrhea in AIDS
Treatment
Nitazoxanide for Immunocompetent
2 mins
E. coli Overview
Characteristics
Gram-Negative
Bacillus
Purple Colony with Metallic Green Sheen
Lactose-Fermenting
Pink on MacConkey Agar
Disease
Diarrhea
Lipid A Septic Shock
P Pili Pyelonephritis and Cystitis
K Capsule Neonatal Meningitis
K Capsule Pneumonia
H Antigen Flagella
2 mins
Entamoeba histolytica
Pathophysiology
Protozoa
Amebiasis
Ingestion of Cysts in Food and Water
Signs and Symptoms
Bloody Diarrhea
Flask-Shaped Ulcer
Liver Abscess
Anchovy Paste
RUQ Pain
Diagnosis
RBCs in Cytoplasm of Trophozoite
Cyst With Four Nuclei
Treatment
Metronidazole
Iodoquinol
3 mins
Enterohemorrhagic E. Coli (EHEC)
Characteristics
O157:H7
Non-Sorbitol Fermenting
Hamburger Meat
Produces Shiga-like Toxin
Gram-negative
Lysogeny
Inactivates 60S Ribosome
Disease
Bloody Diarrhea
Hemolytic Uremic Syndrome (HUS)
Hemolytic Anemia
Acute Renal Failure
Thrombocytopenia
2 mins
Fluoroquinolones Antibiotics
-floxacin
Mechanism of Action
Inhibits Topoisomerase II & IV
Bactericidal
Indications
Gram-negative Rods
Pneumonia
Gastrointestinal Infections
Urinary Tract Infection
Genital Infections
Drugs
Levofloxacin
Ciprofloxacin
Has Pseudomonas Coverage
Considerations
Avoid Polyvalent Cations
3 mins
Fluoroquinolones Toxicities
Diarrhea
Skin Rash
Headache
Tendon Rupture in Adults
Myalgias in Kids
Damage to Cartilage
Teratogen
QT Prolongation
1 min
Giardia lamblia
Characteristics
Protozoa
Ingestion of Cysts
Seen in Campers
Daycare Centers
Mental Hospitals
Infects Small Intestine
Signs and Symptoms
Bloating
Flatulence
Fatty Diarrhea
Diagnosis
Crescent-shaped Protozoa Adjacent to Epithelial Brush Border
Predisposed if Low IgA
Treatment
Metronidazole
3 mins
Listeria Monocytogenes Characteristics
Characteristics
Gram Positive
Bacillus
Intracellular
Survives in Cold Temperature
Actin Rocket
Tumbling Motility
Catalase-Positive
Beta-Hemolytic
Only Gram-Positive with Endotoxin-Like Structure
2 mins
Listeria Monocytogenes Disease
Signs and Symptoms
Soft Cheese
Pregnant Women Have Flu-Like Symptoms
Pregnant Women Have GI Symptoms
Granulomatosis Infantiseptica
Spontaneous Abortion
Meningitis
Monocytes in CSF
Treatment
Ampicillin
2 mins
Macrolides
Mechanism of Action
Bacteriostatic
Bind to 23S rRNA of 50S Subunit
Inhibit Protein Synthesis by Blocking Translocation
Macrolides
Erythromycin
Azithromycin
Clarithromycin
Indications
Gram-Positive Cocci
Atypical Pneumonia
Chlamydia
Considerations
Resistance by Methylation of 23S rRNA Binding
2 mins
Macrolides Side Effects
Side Effects
Diarrhea
Prolonged QT Interval
P450 Inhibitor
Cholestatic Hepatitis
Skin Rash
Eosinophilia
3 mins
Metronidazole
Mechanism of Action
Bactericidal
Forms Free Radical Toxic Metabolites
Damages DNA
Indications
Giardia lamblia
Entamoeba Histolytica
Trichomonas
Gardnerella
Anaerobes
Side Effects
Metallic taste
Disulfiram like Reaction with Alcohol
2 mins
Opioids Overview
Indications
Pain
Weaning
Cough
Diarrhea
Mechanism of Action
Agonists at Mu (μ), Kappa (Κ), and Delta (δ) Receptors
Decrease Synaptic Transmission
Side Effects
Respiratory Depression
Addiction
Miosis
Constipation
2 mins
Salmonella Enterica Spp.
Characteristics
Animal and Human Reservoir
Poultry and Eggs
Turtles
PMN Immune Response
Symptoms
Gastroenteritis
Diarrhea
Possibly Bloody
Treatments
No Antibiotics
No Vaccine Available
2 mins
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