Flea Bytes: Treating Aspiration Pneumonia

For most patients: Ampicillin/Sulbactam is sufficient for oral aerobe/anaerobic coverage

For penicillin allergic patients: Clindamycin monotherapy covers oral aerobes/anaerobes

For hospital-acquired aspiration PNA: Coverage of aerobic bacteria, especially GPC and GNR are more important than anaerobes: Pip/Tazo or meropenem monotherapy

In patients with high risk factors for MRSA, can add an agent with MRSA activity but if MRSA is not detected, this agent should be discontinued

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Flea Bytes: Polymixin/Meropenem Synergy

Meta-analysis found in vitro synergy.  Especially in A baumanii. Mechanism unclear

Synergy testing can be done on isolate if available

Can not necessarily infer in vivo synergy (Beta-lactam/aminoglycoside synergy is demonstrated in vitro but NOT in vivo for example).

Systematic Review and Meta-Analysis of In Vitro Synergy of Polymyxins and Carbapenems. Antimicrobial Agents and Chemotherapy. October 2013 Volume 57 Number 10. p.5104 – 5111.

Tidings from the Citadel: Accuracy of Lung Ultrasonography in the Diagnosis of Pneumonia

16 studies were included – significant heterogeneity, but of 2359 patients. Heterogeneity was assessed graphically and with a Q test. The Q test should only be used once in a data set to exclude outliers. The reference standard, we considered it to be of high quality if based on CT alone or when it consisted of a final diagnosis made by experts using an integrated synthesis of radiology and laboratory or microbiological data (or both).

The highest risk of bias stemmed from the flow of patients within each study because of an uneven application of the reference test (differential verification bias).

The dispersion of studies in the ROC plane suggests marked heterogeneity.
The 95% CI of the overall effect indicates a sensitivity of approximately 80% to 90% and a specificity of 70% to 90%.

References:
Accuracy of Lung Ultrasonography in the Diagnosis of Pneumonia in Adults: Systematic Review and Meta-Analysis – Ana M. Llamas-Álvarez, MD; Eva M. Tenza-Lozano, MD; and Jaime Latour-Pérez, MD, PhD; . Chest 2017; 151(2):374-382

Flea Bytes: Antibiotics or Surgery for Spinal Epidural Abscess

Baseline rates of treatment failure have varied in studies and rates have ranged from 8.5 to 17% in the best case scenarios to 43-75% in other studies. So even at baseline, we know that a significant number of patients will fail antibiotics and require surgery. Risk factors include diabetes mellitus, leukocytosis greater than 12.5, positive blood cultures, and C-reactive protein greater than 115. One risk factor increases failure rates for to 35.4%, two risk factors increases failure to 40.2%, and three or more risk factors increases failure rates to 76.9%.

So basically, most patients should ideally managed with surgery and barring that we should advocate for surgery in patients who have risk factors. 

Flea Bytes: Duration of Antibiotics for Intra-abdominal Abscess

STOP-IT trial: In patients with intraabdominal infections WITH source control, outcomes were similar between fixed duration (4 days) vs. duration guided by clinical improvement – 2 days after the resolution of fever, leukocytosis, and ileus (mean 8 days). Both intention to treat and per-protocol analysis found no difference. However, the study was terminated early due to funding, and only enrolled half the intended patients.

Stopit

 

Reference:
N Engl J Med 2015;372:1996-2005

Flea Bytes: Hospital Acquired Pneumonia (HAP)

  • Definition: pneumonia that occurs 48 hours or more after admission and did not appear to be incubating at the time of admission.
  • HCAP Removed because many patients who met criteria were in fact not at increased risk for multi-drug resistant organisms, MDROs
  • Recommended antibiotics: anti-pseudomonal +/- double pseudomonal coverage +/- MRSA coverage
  • MRSA Risks: abx use IV abx in past 90 days, unit where prevalence of MRSA among S. aureus isolates is not known or >20%. No recommendations regarding use of MRSA swab to guide need for MRSA coverage.
  • Non-invasive Sputum cultures recommended to guide therapy
  • Duration: 7 days
  • New CAP guidelines (to include patients from nursing homes) are pending.

Reference:

http://www.idsociety.org/Guidelines/Patient_Care/IDSA_Practice_Guidelines/Infections_by_Organ_System/Lower/Upper_Respiratory/Hospital-Acquired_Pneumonia_(HAP)/

 

Tidings from the Citadel: Restarting ART in Patients with OIs

Concern over overlapping toxicities, pill burden, and drug interactions led some clinicians to delay ART initiation in patients with AIDS-related OI. This study demonstrates that initiating early ART is beneficial.
282 patients with CD4 <200 and AIDs-related OI or severe bacterial infection randomized to early ART within 14 days or deferred ART that started after 4 weeks. Improved AIDs illnesses or deaths. The study population consisted predominantly of patients with Pneumocystis pneumonia (63%), cryptococcal meningitis (12%), and AIDS-associated bacterial infections (12%).
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The actual timing of when ARTs were started was 12 vs 45 days, which argues for starting ARTs within 2 weeks and not immediately.
No difference in the occurrence of IRIS (6 vs 9%).
Keywords:
#Early #HIV #Opportunistic infections #Retroviral Therapy #ART #pneumocystis #OI #HAART #Mortality
Reference:
Early Antiretroviral Therapy Reduces AIDS Progression/ Death in Individuals with Acute Opportunistic Infections: A Multicenter Randomized Strategy Trial – Zolopa AR, Andersen J, Komarow L, Sanne I, Sanchez A, et al. PLoS ONE 2009 4(5): e5575.