This document provides an introduction to antibiotics and discusses principles of appropriate antibiotic use. It begins by outlining the goals of understanding why individual antibiotic use matters and how to use antibiotics more effectively. It then discusses the scope of antibiotic overprescribing in the US and consequences such as antibiotic resistance. The document emphasizes optimizing antibiotic therapy through early and targeted use, consideration of local resistance patterns, and de-escalation when possible. It also addresses factors influencing overprescription and strategies to improve appropriate use.
General Principles of Antimicrobial Selection - 2018Arwa M. Amin
Module: Pharmacology and Therapeutics III, (Therapeutics part)
Coordinator: Dr. Arwa M. Amin Mostafa
Academic Level: Undergraduate, B.Pharmacy
School: Dubai Pharmacy College
Year of first presented in Class: 2018
This presentation is for Educational purpose. It has no commercial value associated with it
Introduction to bacterial resistance to antibiotics, types of resistance, brief explaining & examples
The lecture was presented at Al-Mahmoudiya General Hospital at Wed, 17th Nov. 2021
Represented & updated as part of the training course for fresh appointed pharmacist at 16/5/2023
General Principles of Antimicrobial Selection - 2018Arwa M. Amin
Module: Pharmacology and Therapeutics III, (Therapeutics part)
Coordinator: Dr. Arwa M. Amin Mostafa
Academic Level: Undergraduate, B.Pharmacy
School: Dubai Pharmacy College
Year of first presented in Class: 2018
This presentation is for Educational purpose. It has no commercial value associated with it
Introduction to bacterial resistance to antibiotics, types of resistance, brief explaining & examples
The lecture was presented at Al-Mahmoudiya General Hospital at Wed, 17th Nov. 2021
Represented & updated as part of the training course for fresh appointed pharmacist at 16/5/2023
Antibiotics are most common therapeutic agents used in hospitals across world, however, microbial world is becoming resistant day by day, posing special challenges to clinicians specially working in ICU set ups. There are multiple ways to curb this menace, if approached together in antibiotic stewardship way, can bring about wonders and retain therapeutic potentials of these drugs.
Role of PK PD in Antibiotic Stewardship Program with case study. This presentation gives an comprehensive overview about role of PK PD in antibiotic stewardship program.
This PDF deals with important guidelines, with respect to usage of antibiotics. This PDF outlines the important strategies involved while using antibiotics, and important factors involving antibiotic selection.
Antibiotics are most common therapeutic agents used in hospitals across world, however, microbial world is becoming resistant day by day, posing special challenges to clinicians specially working in ICU set ups. There are multiple ways to curb this menace, if approached together in antibiotic stewardship way, can bring about wonders and retain therapeutic potentials of these drugs.
Role of PK PD in Antibiotic Stewardship Program with case study. This presentation gives an comprehensive overview about role of PK PD in antibiotic stewardship program.
This PDF deals with important guidelines, with respect to usage of antibiotics. This PDF outlines the important strategies involved while using antibiotics, and important factors involving antibiotic selection.
Antibiotics,antibiotics resistances,classification of antibiotics,misuse of antibiotics details discussed here. for more information visit my blog helpful for pharmacy and medical student.thanks.
http://mydreamlan.wordpress.com/category/education/
penicillins - power point - History,mechanism of action,classification,chemis...Dr. Ravi Sankar
Antibiotics - Penicillin's - power point - History, mechanism of action, classification, chemistry, SAR, Nomenclature, uses, side effects- Medicinal chemistry.
Prof. P. Ravisankar M. Pharm., Ph.D.
HOD .,
Vignan Pharmacy college
vadlamudi- Guntur-A.P, India.
banuman35@gmail.com
Phone: 0 9059994000
0 9000199106
Antibiotic policy and trends in antibiotic policy,
References
Infection control: Basic concepts and practices, 2nd edn.
www.cdc.org
Antibiotics guide: choices for common infections
Chennai Declaration
CDC Key Prevention Strategies for Antimicrobial Resistance Prevent Infection Step 1: Vaccinate Fact:
Influenza and pneumococcal vaccination of at-risk hospital patients and influenza vaccination of healthcare personnel will prevent infections.
Step 2: Get the catheters out Fact:
Catheters and other invasive devices are the # 1 exogenous cause of hospital-onset infections.
Diagnose & Treat Infection Effectively Step 3: Target the pathogen
Fact:
Appropriate antimicrobial therapy saves lives.
Step 4: Access the experts Fact:
Infectious diseases expert input improves the outcome of serious infections.
•
Use Antimicrobials Wisely
Step 5: Practice antimicrobial control Fact:
Programs to improve antimicrobial use are effective. (Antimicrobial Stewardship)
•
Step 6: Use local data
Fact:
The prevalence of resistance can vary by locality, patient population, hospital unit, and length of stay.
•
•
Step 7: Treat infection, not contamination Fact:
A major cause of antimicrobial overuse is “treatment” of contaminated cultures.
Step 8: Treat infection, not colonization Fact:
Step 9: Know when to say “no” to vancomycin Fact:
Vancomycin overuse promotes emergence, selection,and spread of resistant pathogens.
•
Step 10: Stop antimicrobial treatment Fact:
Failure to stop unnecessary antimicrobial treatment contributes to overuse and resistance.
Prevent Transmission
Step 11: Isolate the pathogen Fact:
Patient-to-patient spread of pathogens can be prevented.
•
Step 12: Break the chain of infection Fact:
Healthcare personnel can spread antimicrobial-resistant pathogens from patient to patient
Antimicrobial stewardship; is an activity that includes appropriate selection, dosing, route, and duration of antimicrobial therapy…..
Why is Antimicrobial Stewardship Important?
200-300 million antibiotics are prescribed annually….45% for outpatient use
25-40% of hospitalized patients receive antibiotics
10-70% are unnecessary or suboptimal
5% of hospitalized patients who receive antibiotics experience an Adverse reaction.
Health insurance companies will no longer reimburse for hospital acquired conditions deemed preventable.
Why is an antibiotic policy necessary?
To improve patient care by considered use of antibiotics for prophylaxis and therapy.
To rationalize the use of antibiotics.
To prevent or retard the emergence of resistant strains.
To improve education of junior doctors by providing guidelines for appropriate therapy
What are the clinical uses of antibiotics :
1. Therapeutic use:-
It is administration of an antimicrobial agent where substantial microbial infection has occurred.
2. Prophylactic Use:-
It is the use of antimicrobial agent before any infection has occurred to prevent a subsequent infection.
The Antimicrobial Stewardship Program (ASP) should be administered by multidisciplinary team (AST) composed of:
an infectious diseases (ID)physician
a clinical pharmacist with ID training,
a clinical microbiologist,
an IC professional,
Antibioti
Rational use of antibiotics by M. Jagadeesh, Creative Educational Society's C...Dr. Jagadeesh Mangamoori
Rational use of antibiotics is extremely important as injudicious use can adversely affect the patient, cause emergence of antibiotic resistance and increase the cost of health care.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Factory Supply Best Quality Pmk Oil CAS 28578–16–7 PMK Powder in Stockrebeccabio
Factory Supply Best Quality Pmk Oil CAS 28578–16–7 PMK Powder in Stock
Telegram: bmksupplier
signal: +85264872720
threema: TUD4A6YC
You can contact me on Telegram or Threema
Communicate promptly and reply
Free of customs clearance, Double Clearance 100% pass delivery to USA, Canada, Spain, Germany, Netherland, Poland, Italy, Sweden, UK, Czech Republic, Australia, Mexico, Russia, Ukraine, Kazakhstan.Door to door service
Hot Selling Organic intermediates
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
Follow us on: Pinterest
Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
2. Goals of Lecture
At end of lecture, you can answer two critical questions:
1. Why does your use of antibiotics matter?
2. How can you use antibiotics more effectively?
We need a new perception and culture surrounding
antibiotic use – to RESPECT the dangers of antibiotic
misuse and to have CONFIDENCE in the benefits and
ability to use antibiotics wisely!
4. Scope of Antibiotic Prescribing
• 2nd most commonly prescribed
drug class in U.S.
• 5% of world’s population but
nearly 50% of worldwide antibiotic
use in the U.S.
• Accounts for ≈ 20% of typical
hospital pharmacy budget
Fridkin S, et al. MMWR 2014;63(09):194-200.
5. Antibiotic Misuse
• Up to 50% of antibiotics
prescribed are inappropriate
• A recent study found 30% of all
antibiotic days were unnecessary:
• Excessive duration
• Non-infectious etiology
• Colonizers or contaminants
• Redundant coverage
• Failure to de-escalate abx
Hecker MT, et al. Arch Intern Med . 2003; 163:972-978
6. Would we accept this “failure rate” in other
areas of medicine?
7. Consequences of Antibiotic Misuse
Dellit TH, et al. Clin Infect Dis. 2007;44:159-77.
Adverse Drug
Events and
Toxicity
Superinfection
(C. difficile)
Antibiotic
Resistant
Pathogens
Excess Mortality
and Costs
Inappropriate
Antibiotic Use
9. Antibiotics and QTc Prolongation
• Culprit Drugs: Macrolides, Fluoroquinolones, Azoles
• Higher risk if baseline QTc prolonged or other high-risk drugs
• 2 large retrospective studies of azithromycin and levofloxacin
use, primarily in outpt URI or COPD, found increased risk of
CVD and all-cause mortality compared to amoxil/no abx1,2
• Retrospective VA study of azithromycin use in hospitalized
CAP patients showed decreased 90-day mortality and small
excess risk of MI compared to other antibiotics3
1. Ray W, et al. N Engl J Med 2012. 366:1881-189. 2. Rao GA, et al. Ann Fam Med. 2014;12(2):121-7.
3. Mortensen EM, et al. JAMA 2014; 311(21):2199-2208.
Take Home Points:
1. Don’t give your patient an abx if they likely
have a viral URI
2. Consider the baseline QTc if using a high-
risk abx but don’t avoid use if indicated
10. Clostridium difficile Infection (CDI)
• Antibiotic exposure is the single most important risk factor
for the development of CDI
• Patients who receive broad-spectrum antibiotics during
hospitalization are 2.9 times more likely to develop CDI
http://www.cdc.gov/drugresistance/threat-report-2013/
Fridkin S, et al. MMWR 2014;63(09):194-200.
11. Antibiotic Resistant Pathogens
Bartlett J, et al. Clin Infect Dis. 2013; 56(10):1445-50)
• The dominant driver of antibiotic resistance is use (and
overuse) of antibiotics
Pathogen Country Antibiotic Usagea Rate of Resistance
Klebsiellab Greece
The Netherlands
38
11
38%
0.2%
MRSAc Greece
The Netherlands
38
11
51%
1.60%
Rates are for 2010 – 2011, for intensive care units in the Netherlands and Greece
a Daily drug dose per 1000 inhabitants
b Bacteremic Klebsiella: rate with carbapenemase-producing strains
c MRSA relative to all S. aureus isolates
13. National Action Plan for CARB
https://www.whitehouse.gov/sites/default/files/docs/national_action_plan_for_combating_antibotic-
resistant_bacteria.pdf
14. Competing Tensions in Antimicrobial Use
Need for timely,
appropriate antimicrobial
initiation in serious
infections
Need to avoid
unnecessary
antimicrobial use to
prevent resistance and
adverse effects
Collateral
Damage
Hit Hard
Up Front
15. Targeted Approach to Abx Therapy
• Optimize antimicrobial effectiveness
• Early, appropriate therapy (Broad-spectrum in severe infections)
• Consider local susceptibility data and host risk for resistant pathogens
• Limit unnecessary antimicrobial use
• Reassess diagnosis and response to Rx at 48-72 hours
• De-escalate based on culture results
• Use shortest duration necessary
• Follow local protocols/guidelines for optimal Rx
• Prospective audit and feedback
• Apply formulary control/restrictions
17. Psychology of Antibiotic Prescribing
Drivers of Antibiotic Use include:
• Physician uncertainty and anxiety over “missing an infection” >
anxiety over potential risks of antibiotic use
• Stated or perceived patient expectations
• Emphasis on potential benefit to the individual patient over the
societal risk of antimicrobial resistance
Antibiotics are unique as the only drugs that lose their efficacy
over time (for all patients) the more they are used.
--Dr. Brad Spellberg
Flanders SA, et al. JAMA Internal Med 2014; 174 (5): 661-662.
19. Questions to Ask When Starting an Abx
• Is an antibiotic indicated based on clinical findings?
• Have appropriate cultures been sent before starting
antibiotics?
• What is appropriate empiric Rx based on most likely
pathogens?
• Are there important host factors to consider?
• What is the best drug dose and route of administration?
• What is the anticipated duration of therapy?
Reese RE et al. Principles of Antibiotic Use. In: A Practical
Approach to Infectious Diseases 5th ed. 2003
20. 3 Approaches to “Learning” Antibiotics
1. Pharmacologic Drug Class
• Traditional abx lectures in med school; good introduction to abx
• May be difficult to translate into clinical practice
2. Organism-Specific Activity
• Useful for key pathogens (MRSA, Pseudomonas)
3. Empiric Rx for Clinical Syndromes
• Based on site of infection and most common expected pathogens
(e.g. CAP, acute bacterial meningitis)
• More on this in Intro to Antibiotics: Part II
• Write down any questions re: antibiotics on index card
21. Antibiotic Educational Resources
• Antimicrobial Resource
Guidebook
• On UT ASP website
• Online or Smartphone Apps
• Johns Hopkins Abx Guide
• Sanford Guide
• Antibiotic Basics for
Clinicians 2nd edition
by Alan Hauser
Burdette S D et al. Clin Infect Dis. 2012;55:114-125
23. Antibiotic PK/PD Principles
Craig WA. Clin Infect Dis 1998; 26:1-12.
• Pharmacokinetics (PK): effect the body has on a drug
• Pharmacodynamics (PD): effect a drug has on the body
and the bug
24. Pharmacokinetics: Absorption
• Affected by a number of
physiologic parameters
• IV route preferred in serious
infections or if concerns re: GI
absorption
• IV-to-PO switch key for certain
agents when tolerating po
• Avoids IV access complications
• Decreased costs
• Decreased hospital LOS
ABX W/ Excellent PO Bioavailability
Fluoroquinolones
Metronidazole
Clindamycin
TMP-SMX
Linezolid
Rifampin
Fluconazole
25. Pharmacokinetics: Distribution
Patient is admitted with fever, HA and signs of sepsis and
empirically started on Vanc and pip/tazo. LP is performed with
findings c/w acute bacterial meningitis. What is the problem
with this abx regimen?
- Pip/tazo (Zosyn) has suboptimal CNS penetration.
Patient is admitted with fevers, SOB and pleuritic chest pain.
Blood Cx grow MRSA with an MIC of 2. The patient is started
on Daptomycin. CXR shows multifocal dense consolidation in
the right lung. What is the problem with this abx regimen?
- Daptomycin is inactivated by pulmonary surfactant so it is
ineffective against PNA.
26. Pharmacokinetics: Metabolism
• Many antibiotics interact with CYP 450 enzymes, leading to
important drug-drug interactions
• Affects statins, benzos, immunosuppressants, anticonvulsants,
contraceptives, etc.
• Potent inhibitors Increase other drug levels
• Macrolides (clarithromycin)
• Azoles (fluconazole, itraconazole)
• HIV protease inhibitors (ritonavir)
• Ciprofloxacin
• Potent inducers Decrease other drug levels
• Rifampin, Rifabutin
• Anticonvulsants
27. Metabolism: Examples
An HIV patient was diagnosed with TB at an OSH and started on RIPE.
He now presents to his HIV clinic with a new HIV viral load of 23k
despite med adherence. What happened?
- Rifampin induced metabolism of HIV medications leading to
virologic failure. Rifabutin is substituted at adjusted doses in TB
Rx for most HIV regimens.
An HIV patient is admitted to ICU and intubated for respiratory failure.
His HIV medications are continued. Now, he is ready for extubation
so his sedatives (midazolam and fentanyl) are held, but the patient
will not wake up for 3 days. What happened?
- HIV regimen likely includes ritonavir, which inhibits midazolam
metabolism and dramatically increases AUC. Alternate benzos
such as lorazepam should be used in pts on HIV PIs.
28. Antibiotics and Warfarin
• Carefully review drug interactions and monitor INR
closely when starting abx in patients on warfarin!
• Profound increase in effect/INR:
- TMP/SMX - Metronidazole
• Potential significant increase in effect/INR:
- Azole antifungals - Fluoroquinolones - Clarithromycin
• Decrease in effect/INR:
- Rifampin - Rifabutin
29. Pharmacokinetics: Excretion
• Most agents are renally excreted and may require dose
adjustment based on estimated CrCl
• Some notable agents primarily hepatic clearance
• Macrolides, nafcillin, ceftriaxone, clindamycin, linezolid, echinocandins
• May be able to utilize to therapeutic advantage in dosing
• For patients on chronic hemodialysis, cefazolin (2 g/2 g/3 g) or
cefepime (2 g/2 g/2 g) can be dosed during 3x-weekly HD sessions
without additional IV access
30. Pharmacodynamics
PD Parameter Drug Class
% Time > MIC Beta-lactams
Tetracycline
Linezolid
AUC/MIC FQ
Vancomycin
Azithromycin
Cmax/MIC Aminoglycosides
Rybak M. Am J Infect Control 2006; 34(5):S38-45.
31. Extended or Continuous Infusion:
Beta-Lactams
• Optimize % Time > MIC parameter
• Continuous infusion
• Extended infusion
• Smaller doses more frequently
• May help Rx bugs with higher MICs
• Primarily used with following abx:
• PCN G, nafcillin, pip/tazo
• Cefazolin, cefepime
• Meropenem (extended infusion)
• Emerging data of improved clinical
outcomes compared to intermittent
dosing
Abdul-Aziz et al. Annals of Intensive Care 2012, 2:37.
32. Once Daily Aminoglycoside Dosing
• Maximizes clinical efficacy
while minimizing toxicity
for GNR infections
• Initial dose given based
on dosing weight
• Gent/tobra: 5-7 mg/kg
• Amikacin: 15 mg/kg
• Check level 8-12 hours
after first dose to
determine interval based
on nomogram
33. Antibiotic Drug Allergies
• Common cause of broad spectrum or suboptimal abx Rx
• HISTORY IS KEY (Current and prior Rxn)
• PCN Allergy
• 10% of patients “PCN allergic”; 90% of these will tolerate a PCN
• Skin testing available for PCN
• Cross-reactivity to Cephs (10% 1st gen, 1-2% 3rd gen)
• Cross-reactivity to Carbapenems (10% early studies, 1-2% in practice)
• No cross-reactivity with Aztreonam
• Can consider desensitization (proven, severe rxn with no
alternative Rx) or graded challenge (less severe rxn)
35. Antibiotic Susceptibility Testing
• Traditional parameters of antibiotic efficacy
• Minimum Inhibitory and Bactericidal Concentrations (MIC and MBC)
• MIC: minimum drug concentration to inhibit growth
• MBC: minimum drug concentration to kill 99.9% of bacteria
• Breakpoint: MIC cut-off to define bacteria as susceptible,
intermediate, or resistant to an antibiotic (defined by FDA and CLSI)
Park S, et al. J Korean Med Sci. 2008 Feb;23(1):49-52
MIC Breakpoints for M. abscessus
37. Interpretation of Susceptibility Results
PSEUDOMONAS AERUGINOSA:
SUSC INTP
AMIKACIN....................... <=16 S mcg/ml
CEFEPIME......................... >16 R mcg/mL
CEFTAZIDIME................... >16 R mcg/ml
CIPROFLOXACIN................. >4 R mcg/ml
GENTAMICIN.................... <=4 S mcg/ml
IMIPENEM.......................... >8 R mcg/ml
PIPERACILLIN/TAZ.............. 64 S mcg/mL
TICAR/K CLAV'ATE............ >64 R mcg/mL
TOBRAMYCIN.................... <=4 S mcg/ml
Remember measuring susceptibility in test tube,
not in the patient!
The “90 – 60” Rule
39. Bacteriocidal vs. Bacteriostatic Drugs
Bacteriocidal Bacteriostatic
Beta-lactams
Vancomycin
Fluoroquinolones
Aminoglycosides
Daptomycin
Rifampin
Metronidazole
Macrolides
Clindamycin
Linezolid
Tetracyclines
Tigecycline
Chloramphenicol
• Laboratory, not a clinical, term
• Single agent can be -cidal and -static depending on organism
• Unimportant for uncomplicated infxn with intact host immunity
• May be preferred where host defense is incomplete:
• Endocarditis, Meningitis, Febrile Neutropenia, Osteo
Finberg RW. Clin Infect Dis 2004;39:1314-20
41. • An effort to promote best antibiotic practices, by ensuring
the right drug is used for the right bug, at the right dose,
for the right duration. The primary goal is to improve
patient outcomes, while simultaneously decreasing
toxicity, antibiotic resistance, C. difficile infections, and
cost.
Antimicrobial Stewardship: What is it?
Right DRUG for Right BUG,
Right TIME and Right DOSE
for the Right DURATION
Dellit TH, et al. Clin Infect Dis. 2007; 44:159–77.
42. #1 Observe antibiotic “best practices”
What can you do?
http://www.cdc.gov/drugresistance/threat-report-2013/
43. #2 Optimize dose and route of antibiotic
administration
• Therapeutic Drug Monitoring (Vancomycin, AGs)
• Continuous or extended infusions
• IV-to-PO Switch
What can you do?
ABX W/ Excellent PO Bioavailability
Fluoroquinolones
Metronidazole
Clindamycin
TMP-SMX
Linezolid
Rifampin
Fluconazole
44. #3 Avoid double anaerobic coverage
• Avoid adding clindamycin or metronidazole to beta-
lactams with excellent anaerobic coverage such as pip-
tazo and carbapenems
• Exceptions: metronidazole for C. difficile or clindamycin
for toxic shock syndrome or necrotizing fasciitis
• One study from national VAs found that 25% of all
metronidazole days of therapy were NOT indicated
What can you do?
Huttner B, et al. J Antimicrob Chemother. 2012;67(6):1537-9.
45. #4 De-escalate/stop antibiotics or shorten
duration of therapy when appropriate
• Importance of “antibiotic timeout” to reassess clinical status
and culture results at 48-72 hours
• Multiple RCT and meta-analyses demonstrate non-inferior
outcomes with shorter Rx courses
• VAP (Non-PseA)= 8 days
• Cellulitis = 5 days ≈ 10 days
• UTI or pyelonephritis = 7 days
• CAP = 5 days (with high dose FQ)
What can you do?
Bartlett J, et al. Clin Infect Dis. 2013; 56(10):1445-50.
46. #5 Avoid antibiotics for inappropriate
indications
• Upper respiratory tract infections (colds, acute
bronchitis, non-strep pharyngitis)
• Early or mild sinusitis
• Asymptomatic bacteriuria
What can you do?
Little or no potential benefit to Abx and significantly
outweighed by potential harms!
47. • Discuss indications, appropriate
use and risks of abx
• Recommend specific
symptomatic Rx and a back-up
plan
• Constructively correct false
popular beliefs
What can you do?
www.cdc.gov GET SMART Campaign
#6 Educate your patients on when
antibiotics are and are NOT effective
48. #7 Follow and become good “mentors”
of wise antibiotic use
What can you do?
52. Conclusions
• Antibiotics are an important shared resource and the
ways that we use them matter now and for the future
• Need to UNDERSTAND and RESPECT the
consequences of antibiotic misuse or overuse
• Need to gain CONFIDENCE in the benefits and ability to
use antibiotics wisely
Your program leadership, faculty, ID fellows, other
residents, pharmDs, and stewardship teams are
committed to helping you achieve these goals!