Presentation on theme: "News in Diagnosis and Treatment of Fungal Infections Theoklis Zaoutis, MD, MSCE Professor of Pediatrics and Epidemiology Perelman School of Medicine at."— Presentation transcript:
News in Diagnosis and Treatment of Fungal Infections Theoklis Zaoutis, MD, MSCE Professor of Pediatrics and Epidemiology Perelman School of Medicine at the University of Pennsylvania Associate Chief, Division of Infectious Diseases The Children’s Hospital of Philadelphia Pediatric Infectious Diseases Seminar, Thessaloniki 2014
Overview Changes in epidemiology – Do they change or treatment decisions? Challenges in diagnosis What’s new in treatment New considerations in neonatal candidiasis
Fridkin, S. K. et al. Pediatrics 2006;117: Neonatal Candidiasis: Incidence over Time
YearC. albicansC. parapsilosisC. glabrata (Italy) (GER) (AUS) (USA) (DEN) (USA) (USA) (GRE) (UK) (USA) (PFN) (ESP)37474 Pfaller MA, Diekema DJ. Clin Microbiol Rev. 2007;20: Manno G. Int J Antimicrob Agents. 2004; Tragiannidis A et al. Clin Microbiol Infect. 2012;18:e27- e30. Blyth CC et al. Pediatrics. 2009;123: Neu N et al. Pediatr Infect Dis J. 2009,28: Arendrup MC et al. J Clin Microbiol. 2011;49: Dutta A, Palazzi DL. Pediatr Infect Dis J. 2011;30: Dotis J et al. Pediatr Infect Dis J. 2012;31: Oeser C et al. Pediatr Infect Dis J. 2013;32: Steinbach WJ et al. Pediatr Infect Dis J. 2012;31: Klatte JM et al, ICHE 2013 Species Distribution in Children
Species Specific Risk Factors Independent risk factors for C. parapsilosis –99 cases compared to 307 other Candida spp. –Urinary catheter within 1 week, OR 0.37 (95% CI: 0.19, 0.72) –Mech ventilation 48 hrs prior, OR 2.44 (95% CI: 1.44, 4.14) –No difference in outcomes 112 cases C. albicans vs 141 non-albicans Candida –No difference in risk factors or outcomes Independent risk factors for C. glabrata –26 C. glabrata/C. krusei compared to 380 other Candida spp. –Fluconazole exposure in week prior, OR 2.96 (95% CI: 1.18, 7.42) –Age > 2 years, OR 3.52 (95% CI: 1.28, 9.66) Dotis J et al. Pediatr Infect Dis J. 2012;31: Dutta A et al. Pediatr Infect Dis J. 2011;30: Prasad P et al. J Pediatr Infect Dis Soc. 2013;2:
Frequency of Antifungal Resistance in Sentry (% Resistant) C. albicansC. glabrataC. parapsilosisC. tropicalisC. kruzei Fluconazole Voriconazole Posaconazole Caspofungin Micafungin Anidulafungin Resistance defined as: >0.5 for cas, anid, mica for cab, ctrop, ckz and > 4 for Cpar; Cglab >.12 for mica, >.5 for anid and cas; flu > 4 for cab, ctrop, cpara and > 32 for pos and vori for all species Pfaller, et al AAC 2011
Diagnostic Considerations in Children Standard diagnostic procedures generally not different between children and adults –Blood cultures for yeasts and molds –Cultures, microscopy Different from adults (?) –Chest CT imaging –Usefulness of antigen markers –PCR
Day 3 Day 7 Day 14 “halo sign” 68% 22% 19% “air crescent sign” 8% 28% 63% Computerized tomography in adults with invasive aspergillosis Caillot et al. JCO, 2001;19:253
CT Scan Characteristics: Less Specific in Children Prospective study of 139 cases of proven or probable IA in children – Nodules (35%), infiltrates (21%), cavity (14%) – Halo sign (11%) and air crescent sign (2%) uncommon Retrospective study proven/probable IA (14 cases) – Nodules, pleural effusion, segmental pneumonia – Halo sign in 2/14(14%) and air crescent sign in 3/14 (21%) Retrospective study of children with IA (8 cases with CT scans) – Multiple small nodules, no halo or air crescent sign – Bibasilar and segmental infiltrate Burgos A et al. Pediatrics. 2008;121:e1286-e1294. Thomas KE et al. Pediatr Radiol. 2003;33: Allan BT et al. Pediatr Radiol. 1988;18:
Author YearTotal # patients/ episodes in study Testing Indication IA Definition a Proven or probable IA SensSpecTPFPTNFNFalse positive rate b Rohrlich NeutropeniaGuiot 1994 Criteria 10100%92.6% % Sulaihan NeutropeniaLocally defined 9100%89.9% % Steinbach Neutropenia/ acute GVHD EORTC/MSG %87% % d Hovi NeutropeniaEORTC/MSG %93% % Armenian Neutropenia +/- fever/GVHD EORTC/MSG e3e 100%98.7% % Fisher NeutropeniaEORTC/MSG %95% % Prospective Studies Evaluating Galactomannan in Children Table adapted with permission from Fisher BT et al. J Pediatr Infect Dis Soc. 2012;1:
Diagnosis of IFD Recommendations Prospective monitoring of GM in serum every three to four days in children at high risk for IFD is reasonable for early diagnosis of invasive aspergillosis (AII)* Although the optimal cut-off value of GM in the serum of children is not well defined, published data support the use of a threshold of an optical density index 0.5. (serum specimens) (BIII) ** uncertainty whether implementation of this strategy improves clinical outcome; unclear whether this strategy is cost effective (modified)
Diagnosis of IFD Recommendations The very limited published data support the value of GM in the diagnosis of pulmonary aspergillosis (GM in BAL; cut-off 1) and central nervous system aspergillosis (GM in CSF; cut-off 0.5) in children (BIII) Systemic mold-active prophylaxis may decrease the performance of the test (BIII).
β- D -Glucan (BG) Very limited data in children: –Elevated levels of BG were reported in 4 children with IFD (3 patients with candidemia, 1 patient with probable aspergillosis) –Mean BG levels are higher in immunocompetent uninfected children than adults: optimal cut-off children Cohort study of 130 pediatric patients –Malignancy (89 hematologic, 11 other) –Critically ill at high risk (30) –Twice-week sampling using GKT-5M assay –Sensitivity 82% and specificity 82% Karageorgopoulos DE et al. Clin Infect Dis. 2011;52: Mularoni A et al. Clin Vaccine Immunol. 2010,17: Smith PB et al. Clin Vaccine Immunol. 2007;14: Zhao L et al. J Clin Pediatr. 2010;28:1-10.
Diagnosis of IFD Recommendations Although BG testing has been shown to be useful in diagnosing IFD in adult patients, data are too limited to make any recommendations on BG testing in children
Polymerase Chain Reaction-Based Assays for the Detection of Candida Species in Blood Samples From Patients With Invasive Candidiasis Reference (Date) DesignPopulation Characteristics No. of Centers PCR Amplification and Identification Method Type of Blood Sample Maximum Sens of Assay (cfu/mL) Volume of Blood Used (mL) Gene(s)Sens/Spec/ PPV/NPV Wellinghausen et al (2009) P, DAdults and children: 329 adults and 55 children with HM and immuno- deficiency and/or ICU stay 3Real-time PCRWB35 (adults), 2.5 or 1.4 (children) 18S88/93/ 21.8/99.7 Khlif et al (2009) P, DAdults and children: 110 at risk for invasive fungal infection 1Real-time PCRWB S, ITS1, ITS2 81/96/ 90.6/91 Tirodker et al (2003) P, DChildren: 70 in neonatal ICU or pediatric ICU with suspicion of sepsis 1PCRSe S100/88/ 45.5/100 Dendis et al (2003) P, DChildren: 24 with cancer and FN 1PCR followed by APLP/RFLP and sequencing WB30.5ITS2100/75/ 44.5/100 True-positive findings are defined as blood cultures positive for Candida species, whereas true-negative findings are defined as the absence of European Organization for Research and Treatment of Cancer/Mycoses Study Group criteria for invasive candidiasis. Abbreviations: APLP, amplification product length polymorphism; D, diagnostic; ED, emergency department; FN, febrile neutropenia; HM, hematological malignancy; ICU, intensive care unit; ITS, internal transcribed spacer, NPV, negative predictive value; P, prospective; PCR, polymerase chain reaction; PPV, positive predictive value; RFLP, restriction fragment length polymorphism; S, Svedberg; Scr, screening; Se, serum; Sens, sensitivity; Spec, specificity; WB, whole blood.
ECIL 4 Recommendations: 1 st line Therapy of Invasive Aspergillosis Antifungal therapy: * ABLCB II 1 Liposomal AmBB I 1 Voriconazole i.v. +TDMA I 1 Combination therapyC III 1 voriconazole should be preferred in CNS infection. 2 oral voriconazole should be used in presence of renal failure because of potential for accumulation of the cyclodextrin excipient * in alphabetical order
Initial Treatment Algorithm in Pediatric Patients Voriconazole susceptible strain likely Liposomal Amphotericin Modification guided by species, response and tolerance yes Voriconazole no VCZ exposed PCZ exposed high incidence of zygomycosis or no TDM available age < 2 years contraindications references in Groll AH, EHD 2011
Voriconazole: Current Dosage Recommendation Children 2 to 11 years and adolescents years and <50 kg - 2x8 mg/kg IV (day 1: 2x9 mg/kg) - 2x9 mg/kg PO (max: 2x350mg) Adolescents ≥12 to 14 years and > 50 kg and those 15 years and beyond: - 2x4 mg/kg IV (2x6 mg day 1) - 2x200 mg PO (2x400 mg day 1) (adult dose)
New considerations for neonatal candidiasis
Outcomes Following Candiduria in Extremely Low Birth Weight Infants Characteristic No Proven Infection (n = 744) Candiduria (n = 34) a Candidemia (n = 69) b Adjusted OR c (95% CI) e Death by discharge c 85/744 (11%)9/34 (26%)19/69 (28%)2.69 (1.18 – 6.13) Death by 18 months c 94/725 (13%)10/33 (30%)22/61 (36%)2.77 (1.25 – 6.14) NDI by 18 months d 130/159 (22%)6/22 (27%)15/39 (38%)1.62 (.57 – 4.59) Death or NDI by 18 months d 224/693 (32%)16/32 (50%)37/61 (61%)2.49 (1.16 – 5.33) Reasons NDI could be missing: child died, child was not present at the 18-month follow-up, or not enough information was available to determine NDI. Number of children with complete NDI data: no infection (Bayley II [n = 290], Bayley III [n = 309]), candiduria (Bayley II [n = 9], Bayley III [n = 13]), candidemia (Bayley II [n = 26], Bayley III [n = 13]). Abbreviations: CI, confidence interval; CSF, cerebrospinal fluid; NDI, neurodevelopmental impairment; OR, odds ratio. a At least 1 urine culture positive during hospitalization. Infants who had multiple episodes of infection from the same organism are included. Infants who also had Candida in blood/CSF/other sterile source at any time during hospitalization are excluded. b At least 1 blood culture positive during hospitalization. Infants who had multiple episodes of infection from the same organism are included. Infants who also had Candida in urine/CSF/other sterile source at any time during hospitalization are excluded. c Analysis of death by discharge and death by 18 months are adjusted for clustering of children within center. d Analysis of NDI by 18 months or death/NDI by 18 month are adjusted to clustering of children within center and Bayley cohort. e OR (95% CI) is for no proven infection versus candiduria.
Guidelines for the Treatment of Neonatal Candidiasis IDSA – AmB deoxycholate 1 mg/kg (A-II) – Test dose not required; may contribute to delayed clearance – Tolerated well with limited effect on creatinine – Lipid formulations at 3- 5 mg/kg (B-II) if urinary tract involvement is excluded Fluconazole 12/mg/kg (B-II) Echinocandins should be used with caution ESCMID – fluconazole, AmB, Lipid Ampho B, micafungin (B-II) – Caspofungin, ABLC (C-2) Pappas P, CID 2009; Wade KC, et al. Antimicrob Agents Chemother. 2008; Linder N, et al. J.Antimicrob.Chemother. 2003; Saez- Llorens AAC Heresi G PIDJ 2006; Hope WW, et al Clin Micro Infect 2012
Summary Incidence of candidemia is decreasing in United Species distribution relatively stable Resistance does not seem to big problem at this time More evidence being accumulated on improved diagnostics and treatments Mortality maybe decreasing?