Maximizing the efficacy of antibiotic therapy
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1 Community Acquired Pneumonia Maximizing the efficacy of antibiotic therapy João Gonçalves Pereira, MD, PhD ICU Director Hospital Vila Franca Xira
2 Antibiotics and Pneumonia Survival in Bacteremic Pneumococcal Bacteremia Treated with Penicillin or Serum Austrian Ann Intern Med 1964;60:759
3 Antibiotics and Pneumonia Time until start of antibiotic therapy (CAP) Community acquired Sepsis Houck Arch Intern Med 2004; 164: 637 N = % CAP Povoa CCM 2009;37:410 Kumar, A Virulence 2014; 5:1
4 Antibiotics and Pneumonia Pneumonia Bundle Wiemken Semin Respir Crit Care Med 2012;33:213
5 Early antibiotics and outcome Author n Setting Odds Ratio (death) Author n Setting Odds Ratio (death) Gaieski (Crit Care Med 2010; 38:1045) 261 ED (Shock) First hour OR 0.30 No difference independent of De Groot (Critical Care 2015; 19:194) ED First hour PIRO score OR 0.62 Daniels (Emerg Med J 2010; doi: ) 567 Whole hospital Aggressive antibiotic therapy Surgical ICU: Beforeafter First vs second hour OR 0.59 Hranjec (Lancet Infect Dis 2012;12:774) 201 OR for mortality 2.5 Kumar (Crit Care Med 2006;34:1589) 2154 ED (Shock) Hospital-acquired No difference in mortality up to Puskarich (Crit Care Med 2011;39:12066) 372 Appelboam (Crit Care 2010;14:50) 375 Whole surgical hospital infections First hour 6h after OR diagnostic 0.74 First 3h No improvement OR 0.86 with decrease Levy Villela (Crit Care (Am Med J Emerg 2010; Med 38:1) 2014;32:7) Multi-centre ED admitted to the ICU in time to antibiotics (5h to 3h) Barie Pelletier(Surg Infect (Larchmt) Infect (Larch) 2005;6:41) 1999;134:1300) Surgical Surgical ICU patients Per hour No difference delay h,>12h, >24h Ferrer Castellanos-Ortega (Crit Care Med (Crit Care Med 2014;42:1749) Multi-centre ED: Before-after 2010;38:1036) Progressive Early antibiotics increase in OR risk 0.68, per hour p=0.11 ( ) Jalili (Acta Med Iran 2013; 51:454) 145 ED (sepsis) First 2h Inappropriate OR 0.44 vs. appropriate OR Davies (Shock 2014;42:185) 7158 Surgical patients 1.0 No difference in a metanalysis (11 studies included). OR 1.16 Sterling Crit Care Med. 2015;43:1907
6 Accuracy of sepsis diagnosis Infection rate in patients with presumed sepsis upon presentation Klein Klouwenberg Crit Care 2015;19:319 Ø Over 50% of patients with suspected pneumonia probably did not had infection Ø Antibiotics are of no use if patients are not infected (harm?)
7 Antibiotics and Pneumonia Pneumonia Bundle v Better diagnostic tools v Early directed therapy v Adequate dose 1 2 ² Reassess diagnostic ² PK and antibiotic dose ² Response to therapy ² Minimize antibiotic exposure 3 Wiemken Semin Respir Crit Care Med 2012;33:213
8 Antimicrobial dose Pharmacokinetics Antibiotics Absorption Distribution Elimination PK Effect of the antibiotic at the site of infection Concentration at Infection Site Pathogen MIC/MBC PD Bacterial Killing Toxicity Dose antibiotics to maximize its exposure to bacteria Craig WA - CID 1998; 26.1
9 Patterns of Antimicrobial Activity Concentration C max Aminoglycosides Metronidazol 4 Area under the concentration curve Azithromycin 2 Fluoroquinolones Glycopeptides Log 10 CFU/ ml Log 10 CFU/ ml MIC T>MIC Beta-lactams Carbapenems Control ¼ x MIC 1 x MIC 4 x MIC 16 x MIC 64 x MIC Time (hours)
10 Gonçalves-Pereira and Póvoa Critical Care 2011, 15:R206 Antibiotics in critically ill patients: a systematic review of the pharmacokinetics of b-lactams ü Two fold variability of PK parameters (Vd and Cl) ü Usually increase ü No clear correlation with clinical parameters Augmented Volume of Distribution Augmented renal Clearance Meropenem ARC Imipenem Piperacillin Cefpirome Cefepime Ceftazidime Volume of Distribution (L) Udy, Baptista Crit Care Med 2014; 42:520
11 Dose of Antibiotics Obesity Longo. Pharmacoepidemiology and Drug Safety 2013; 22: 970
12 Concentration Patterns of Antimicrobial Activity C max :MIC Aminoglycosides MIC and resistance AUC:MIC Vancomycin Fluoroquinolones Concentration C max :MIC Aminoglycosides MIC=0.5 AUC:MIC Vancomycin Fluoroquinolones T>MIC MIC=1 Beta-lactams Carbapenems Time T>MIC Beta-lactams Carbapenems Time ² Increase in MIC 0.5 1mg/L: Bacteria remain sensitive. ² However AUC:MIC and Cmax:MIC decrease to one half; T>MIC also decreases ² Changes in PK may impact clinical efficacy
13 Bacterial load and mortality Pneumococcal Pneumonia n=353 Rt-PCR positive 26,3% (36,5% positive BC) Septic shock OR 6.29 Mech. Ventilation OR 7.96 Mortality OR 7.08 Patients with positive Rt-PCR Bacterial Load > 10 3 cop/ml (29%) Shock OR 8 Mech. Vent OR 10.5 Mortality OR 5.4 Rello Chest 2009;136:832
14 Selection of initial antibiotics Single vs. double Use of a macrolide in CAP Figure 3. Macrolide versus nonmacrolide therapy and mortality in critically ill patients with community-acquired pneumonia: pooled adjusted risk Sligl Crit Care Med 2014; 42:420
15 Selection of initial antibiotics Single vs. double The CAPUCI study No Shock Shock Survival HR 1.69 (95%CI ) Rodriguez Crit Care Med 2007;35:1493 Macrolides p = 0.99 Death HR 0.48 (95%CI ) Martin-Loeches Intensive Care Med 2010; 36:612
16 Dose of Antibiotics Clinical Success by PSI Class Clinical Success (%) n= n= n= n= n=51 Class I/II Class III Class IV 750 mg 500 mg 84.4 n=32 Patients in Each PSI *Clinically evaluable patients at the 7- to 14-day post therapy visit Dunbar Clin Infect Dis. 2003;37:752
17 Frei et al. BMC Infectious Diseases 2011, 11:188 A clinical pathway for community-acquired pneumonia: an observational cohort study PK/PD guided dose Non Pathway (n=287) Pathway (n=505) ² Lower adjusted 90d mortality (p=0.02) ² Lower LOS (3.9 vs. 5d, p<0.001) 3.9 p< ² Lower Costs ($2485 vs. $3281, p=0.02) Hospital LOS (Days) Figure 1 Adjusted least squares mean hospital length of stay Frei, BMC Infect Dis 2011,11: 188
18 A Multicenter Randomized Trial of Continuous versus Intermittent b-lactam Infusion in Severe Sepsis N=432 Joel M. Dulhunty 1,2, Jason A. Roberts 1,2,3, Joshua S. Davis 4,5, Steven A. R. Webb 6,7, Rinaldo Bellomo 8,9, Charles Gomersall 10,11, Charudatt Shirwadkar 12, Glenn M. Eastwood 8, John Myburgh 13,14, David L. Paterson 15,16, Therese Starr 1,2, Sanjoy K. Paul 17, and Jeffrey Lipman 1,2 ;fortheblingiiinvestigatorsfortheanzicsclinicaltrialsgroup* Conclusions: In critically ill patients with severe sepsis, there was no difference in outcomes between b-lactam antibiotic administration Cefepime by continuous or ceftazidime and intermittent infusion. Australian New Zealand Clinical Trials Registry number (ACT AUIC ICUs Clinical success BLING II study Cure 79% vs. 33%; P = T>MIC of 100% APACHE Cure II 82% 20 vs. 33%; P = day survival 74.3% vs. 72.5% HR 0.91 ( ) Mckinnon. Int J Antimicrob Agents 2008; 31: 345 Dulhunty Am J Resp Crit Care Med 2015; 192: 1298
19 Optimization of minimum concentration/mic ratio Log 10 cfu/ml Placebo Time (days) Log 10 cfu/ml T>MIC=100% & Cmin/MIC= Time (days) Log 10 cfu/ml T>MIC=84% T>MIC=100% Cmin/MIC=1.7+ tobramycin Time (days) Log 10 cfu/ml Time (days) Tam Antimicrob Agents Chemother 2005; Wild type Amp C mutant
20 Dose modulation: A new concept of antibiotic therapy in the critically ill patient?,, Joao Goncalves-Pereira MD a,, José-Artur Paiva MD, PhD b Critically ill septic patient Vasopressors Cardiac output Diuresis Large Volume of Distribution Renal or Hepatic failure Initial High Loading Dose No Increased Clearance (measure Cr Clearance) Yes Large volume resuscitation Invasive Ventilation Surgical procedure Adjust Dose accordingly Maintain High Dose Reassess after 48-72h Any of: Bacteria with a low MIC Normalization of (measured) Cr Clearance Sepsis resolution Adjust Dose Gonçalves-Pereira Crit Care. 2013;28:341
21 Accumulation and Toxicity Ceftriaxone 2 g/d Increase 2-3* from D1 to D7 Cr Cl >50 ml/min <50 ml/min Day 1 19,5 µg/ml 46,5 µg/ml Day7 38,5 µg/ml 125 µg/ml Heinemeyer Int Care Med 1990; 16; 448 Betalactamin-induced central nervous side effects include confusion, disturbances of behaviour, hallucinations, asterixis, myoclonic jerks, and generalised convulsive or nonconvulsive seizures. Those are probably underreported but may contribute to morbidity and mortality. Chatellier Int Care Med 2002; F May promote mitochondrial damage and shutdown. F May interfere with mitochondrial biogenesis and delay recovery. Singer. Plos Med e167
22 Duration of Antimicrobial Activity Reduction of exposure Siegel et al (1999, [10]) Leophonte et al (2002, [11]) Dunbar et al (2003, [12]) Dunbar et al (2004, [13]) Leophonte et al (2004, [14]) Tellier et al (2004, [15]) Tellier et al (2004, [15]) El Moussaoui et al (2006, [16]) File et al (2007, [17]) Cefuroxime 750mg q8h IV, 2d, then cefuroxime axetil 500mg q12 PO, 5d, 7d in total Cefuroxime 750mg q8h IV, 2d, then cefuroxime axetil 500mg q12 PO, 8d, 10d in total 52 No difference in clinical cure Ceftriaxone 1g IV qd, 5d Ceftriaxone 1g IV qd, 10d 244 No difference in clinical cure Levofloxacin 750mg IV/PO qd, 5d Levofloxacin 750mg IV/PO qd, 5d 3-7 d vs d Levofloxacin 500mg IV/PO qd, 10d Levofloxacin 500mg IV/PO qd, 10d 528 No difference in clinical cure and bacteriological outcome 149 Noninferiority in clinical cure and bacteriological outcome Gemifloxacin Amoxicillin/clavulanate 320 No difference in 320mg No qd, 7ddifference 1000/125mg, in outcomes 10d Telithromycin 800mg PO qd, 5d Telithromycin 800mg PO qd, 5d or 7d Amoxicillin 1g IV q6h, 3d Gemifloxacin 320mg PO qd, 5d clinical, bacteriological, and radiological efficacy Telithromycin 800mg PO qd, 7d 378 No difference in clinical cure and bacteriological outcome Clarithromycin 500mg PO bid, 10d Amoxicillin 1g IV q6h, 3d, then amoxicillin 750mg PO q8h, 5d, 8d in total 559 No difference in clinical cure and bacteriological outcome 119 Noninferiority in clinical and radiological success Gemifloxacin 320mg PO qd, 7d 510 Non-inferiority in clinical, bacteriological, and radiological efficacy
23 "I see no hope for the future of our people if they are dependent on the frivolous youth of today, for they are reckless beyond words. When I was young, we were taught to be discreet, respectful of elders, but the present youth are exceedingly disrespectful and impatient." Hesiod, 700 BC
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