The role of the ID Physician in DFI management Presen… · The role of the ID Physician in DFI...
Transcript of The role of the ID Physician in DFI management Presen… · The role of the ID Physician in DFI...
The role of the ID Physician in DFI management
Dr Steve Guy
Western Health
LEAP, 2018
No conflicts of interest or financial disclosures to report. All patient photographs with verbal consent.
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Aims and topics;
1. What is ID / what do we do?
2. (why) Do ID care about DFI?
3. DEFIANZ – Aus/NZ ID diabetic foot research group
4. Where does ID fit in?
a) Diabetes and Infectionsb) Is it OM?c) Microbiology, sampling & antibiotics 101
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What is ID / what do we do?As a specialty;
- Deal with the diagnosis, management and control of infections…. and Antimicrobial stewardship (AMS), and Infection prevention.
In relation to DFI; I would like to think we are active in;
- Inpatient / outpatient management of DFI
- HITH/OPAT - Guideline development wrt antimicrobials
- Research
- Holistic approach to patient
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What do I do where I work?
• Full time ID physician in public hospital setting
• Western Health catchment is >850,000 people
• 55% of whom were born overseas
• Other activities;• Clinical ID; HIV, hepatitis, resistant bacteria, endocarditis, travel.. • Antimicrobial stewardship• Infection Prevention• TB medicine• Teaching & supervision• Research• Committees• Administration
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WH Diabetic Foot Service:Inpatient rounds;Podiatry (x 2-4, senior)
Endo (cons + reg + resident)
Vasc (cons + fellow)ID (cons +/- reg)
Ortho…sometimes!
High risk outpatient;Podiatry, Endocrine, orthotics
Vascular clinic runs concurrently
ID available
Structure / processPodiatry ‘own’ service; co-ordinate, clerical, organisational
24/7 emergency vasc/endo/ID
2 X weekly inpatient rounds2 X weekly outpatients
Always available;
Physio, DM educator, social work, orthotics, wound nurse, pharmacist
Other medical teams prn
Renal, rehab, orthopaedics, gen med, radiology
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Why do I care about Diabetic feet / DFI?
15-25% of people with diabetes will experience foot ulceration-> 15% of these wounds will result in an amputation
Rates of amputation;10 to 20 times those of non-diabetic populations,
1.5 to 3.5 events per 1000 persons per year
These rates can be reduced with good care
(WHO global report on Diabetes 2016, Van Netten, Diabetes/metab research reviews, 2016)
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But why is that relevant?
•Footscray hospital; • Approx 300 beds, average 10 occupied by DFI patients• Average LOS 8 Days
• Diagnosed diabetes present in;
• 8% of our catchment population, • and 30-40% of our inpatients
• Forms a large part of Infectious Diseases work;
• DFI = 20% inpatient ID consults
Bach, MJA, 2014, Commons, J Foot Ankle research, 2018
And more….
Diabetic foot disease causes 33% of Diabetes related clinical costs yet attracts on 0.2% of diabetes related research funding.
And
In Australia, a limb is lost every 2 hours related to diabetes
Lazzarini, MJA, 2018
Can you spot the difference?
Too sexy?? Not sexy enough??
What’s happening in the region??
DEFIANZ (Diabetic Foot Infections Australia New
Zealand)1
1Australasian Society of Infectious Diseases Clinical Research Group
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DIABETIC FOOT INFECTIONS: A SURVEY OF AUSTRALASIAN INFECTIOUS DISEASES CLINICAL PRACTICE
Aims;To identify
1. Quantify ID physician DFI involvement
2. Quantify ID physician inclusion in MDTs
3. To explore current clinical practice (with scenarios)
Methods;Survey monkey
Commons, J Foot Ankle research, 2018
20-30% workload
80% part of an MDT
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Scenario 1 (abbreviated)63 year old lady (hypertension, poorly controlled type 2 diabetes mellitus) has an untreated deep heel ulcer (severity = IDSA moderate / PEDIS 3) present for five weeks. MRI did not demonstrate osteomyelitis. Peripheral pulses present. White blood cell count is normal, ESR is 55. Surgical debridement is undertaken but residual infection remains with non-debrided deep soft tissue samples growing fully sensitive E. coli, fully sensitive P. aeruginosa and methicillin sensitive S. aureus (MSSA).
Outcomes;• 85% chose to give some intravenous therapy
• 91% chose to give some oral therapy afterwards
• 78% treated the pseudomonas
• Total median duration of therapy was 24 days • intravenous median duration 10 days • oral median duration 14 days
Commons, J Foot Ankle research, 2018
Footer Text 11Commons, J Foot Ankle research, 2018
How Does ID fit in To DM Foot disease management?
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Ulceration & wounds.
Secondary infections.
Neuropathy
Ischaemia DeformityApologies to - Monty Python’s Flying Circus
Issue;
DFI is a heterogenous Disease
But; the basic aetiology remains the same
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3 very different problems:
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Where might ID be involved in a Diabetic
patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations DeathDevelopment of;
• Vascular disease
• Neuropathy
• Deformity
90% patients T2DM
• Metabolic syndrome
• CVS risk factors
OPD or Inpatient
management
• Risk of recurrence
Usually CVS
Mehta, Hepatology, 2003
Risk factor and effect size;
BMI/Obesity – BMI > 35 vs < 22 >100 X
Family History / genetics 2-3 X per parent
Others;
Ethnicity, Birth weight, childhood obesity, physical activity, Smoking,
Sleep <6 or >9 hours/day, Diet (Western with sugary drinks),
Coffee consumption, PCOS, GDM, CVS disease, hyperuricemia
Hepatitis C – up to 11X increased risk
Preventability ????Preventability???????
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Where might ID be involved in a Diabetic patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations Death
Mehta, Hepatology, 2003
At all stages of care;
Aim to provide holistic care across spectrum diabetic disease
Manage other diseases (Infections and Non-infections)
Care consistent with patient wishes, values, directives etc.
Educate, advocate for and inform patients
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Where might ID be involved in a Diabetic patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations DeathDevelopment of;• Vascular disease• Neuropathy• Deformity
90% patients T2DM• Metabolic syndrome• CVS risk factors
ID not really involved here…at least with the feet
However, ID may well see patients for other infections:
Diabetes and infections;
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Infections are more common in diabetes•UTI & asymptomatic bacteriuria
• ASB – 3X RR
•Pneumonia (LRTI)• More complicated CAP;
•Skin and soft tissue• Especially foot infections• Necrotising fasciitis• Fournier’s gangrene
•Post-op infection• Related to D1&D2 glycemia
•Sepsis
•Fungal skin / genital
• Complicated UTI • Pyelonephritis (RR 4-5)• Emphysematous pyelonephritis* • Emphysematous cystitis*• Papillary necrosis• Abscess (intra/perinephric)
• Lung / pneumonia• TB (up to 10X risk)• Melioidosis• Staph, GNB infection• RR death with CAP 1.7 – 7.6
• Rhinocerebral mucormycosis*
• Malignant otitis externa*
• Emphysematous cholecystitis
(Grayson; in Jung et al, Infectious Diseases, a clinical approach,2005, Peleg, Diabetes metab research reviews, 2007)
* Almost exclusive to diabetes, surgery usually necessary
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Infections are more common in diabetes
-> Why?
Gallacher, Diabet med 1995, Rajagopalan, CID 2005,Peleg, Diabetes metab research reviews, 2007,Muller, CID, 2005.
• Multiple Proposed mechanisms;• Reduced activity of lymphocytes; both B and T hypo-reactivity• Glycosylation of antibodies and other innate immune proteins• Increased background pro-inflammatory molecules; TNF-a, IL-6, IL-8• Other cytokines reduces• Thicker capillary basement membranes• Neuropathy
• Probably most important (at least acutely with DFI);
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Dysfunctional Polymorphs;
Peleg. Diabetes Metab Res Rev2007
Polymorphs (white blood
cells)
Adhesion to endothelium
Transmigration through vessel wall
(chemotaxis)
Phagocytosis and microbial killing
Increased in diabetes
Reduced chemotaxis, especially BSL >12
Reduced, especially when BSL >12.
Superoxide production reduced α glycemia
Both somewhat restored in with
euglycemia
GCSF restores PMN superoxide production
Diabetic foot disease and infection
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Injury, ulceration
PAD
(30-40% T2DM have this)
Neuropathy (50% T2DM have this)
+/- deformity
Duration / control of DM
Access to good foot care / footwear &
services
Trauma, abnormal loading, callus
Bakker. Diabetes Metab Res Rev 2012
InfectionAmputation &poor healing
Pathogenesis; DFIPsychosocial, Coping &
Adherence
Long term illness
This is really hard for people to cope with
(indefinitely)
‘diabetes distress’
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Where might ID be involved in a Diabetic patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations DeathDevelopment of;Vascular diseaseNeuropathyDeformity
Inpt -> OPD management
Risk of recurrence
Mild/moderate severity;
Guideline and locally adapted resources for outpatient management+/- involvement in high risk foot clinics
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Where might ID be involved in a Diabetic patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations Death
Established neuroischemic footInpt -> OPD
managementRisk of recurrence
Moderate/Severe;Members of inpatient foot services. Use this to optimise processes which enable best infection management;
Ø ID opinion requires information, assessment and plans from at least;Ø podiatry, endo, vascular
Ø Ensure sampling is optimised (clinic/ward based, surgical, radiological)Ø Liaise with lab and interpret microbiologyØ Co-ordinate antimicrobial therapy including HITH/OPATØ Ensure global patient goals are elicited and supported
Is Osteomyelitis present?
And
What is the best antibiotic treatment?
Common questionsID gets asked:
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Is Osteomyelitis present?
Markanday, Open Forum Infectious Diseases 2014
Radiology tests Pos LR Neg LRBone scan 1.4 0.4Labelled WBC scan 4.7 0.12MRI 3.8 0.14SpECT/CT 3.0 0.18FDG-PET 5.6 0.4
**
*
*
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Example – OM?Prior TMA
Ulcer present ‘a while’
Size > 2cm sq
Treated with oral antibiotics
Probe to bone positive
IWGDF 4 (systemic upset)
ESR 106
Xray difficult to interpet
In this case Om very likely present. Microbiology could be anything.Best test to guide infection management is deep bone / tissue biopsy, not imagingAntibiotics are only part of the management!!!
Prior TMA
Ulcer present ‘a while’
Size > 2cm sq
Treated with oral antibiotics
Probe to bone positive
IWGDF 4 (systemic upset)
ESR 106
Xray difficult to interpet
Clinical Gestault +
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IWGDF 2 = Superficial local infection < 2cm
IGWDF 3 = More invasive local infection (ie >2cm from wound) or deeper structure involvement
IWGDF 4 = Local infection as well as systemic sepsis / upset
Wound and infection classification systems
Microbiology & antibiotics 101
The only antibiotic to which I haven’t seen resistance develop is….
Stainless steel
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Sampling and interpretation
Superficial swabs correlate poorly with deep tissue samples
49% sensitive for deeper tissue organism
62% specific ‘’ ‘’ ‘’ ‘’
Chakraborti C. J Hosp Med. 2010Wolcott. J wound care. 2010Lipsky. Clin Infect Dis. 2012
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Diabetic foot infections - organisms
Staph and strep (GPC)
Mixed – Staph/strep, enterics, pseudomonas, anaerobes.
+/- resistant organisms (MRSA etc)
As above, with dead tissue
Above + pseudomonas
Staph and strep, some enterics (GPC/GNB)
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Antibiotics; Simples, right Sergei?Issues;
1. Swab of what??
2. What’s happening with a. Offloadingb. Vascular supplyc. BSL / DM Mxd. Sociallye. Finances to afford thisf. Etc
3. If an antibiotic is used, what are the tissue drug levels / PK predictors of success?
Time for the Keflex reflex?!?
Over the 8 years on the DFS Team, the biggest lesson I haveLearnt?
Importance of vascular supply
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Example: partial foot amputation
Day 5 post 1st digit TMA No foot pulses present ->
Angioplasty femoral stenosisDistal disease unable to be corrected
Clean bone chips – no growth->initial healthy wound (day 2)On tazocin throughout
BKA day 6
Day 5 post 1st digit TMA
Both foot pulses intact, TPs 80/90
Clean bone chips from prox MT-> MSSA. 4 weeks fluclox
VAC wound therapy
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Blood supply is key!
Bakker. Diabetes Metab Res Rev 2012
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Where might ID be involved in a Diabetic patient’s journey?
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations Death
Risk of recurrence Usually CVS
After an episode of infection / ulceration;
People at much higher risk of recurrence;
BUT: To have recurrence, one must;
A) Be alive, andB) Still have a limb.
Mortality post minor/major amputations:
Similar to malignancy!
3 year mortality after any amputation 35-50%
Hoffman, Diabetes and Vascular disease research, 2015
Footer Text 38Hoffman, Diabetes and Vascular disease research, 2015
10 year survival curves post Amputation for Diabetic foot Disease:
- Minor amputation(s) only- Major amputation- Minor amputation(s)
then Major amputation
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Where might ID be involved in a Diabetic patient’s journey; the upshot….
Pre-diabetes Uncomplicated Diabetes Foot complications Amputations Death
Optimist view;• (find and treat Hep C!)• Take the time to ensure diabetes is managed
properly when seeing patients for related/unrelated non-DFU issues
• Lobby public health to support good diabetes care• Manage CVS risk profiles
Nihilist view:
Once mod/severe DFI, especially with amputation, its basically palliative care!
Footer Text 40Pre-diabetes Uncomplicated Diabetes Foot complications Amputations Death
SUMMARY;When might ID be
needed, what do we need, & how else
might we contribute
Systems;Research, EducationAdvocate for resourcingInvolvement in QA
Structures / processes:Locally adapted guidelines Local protocolsSpecimen collection
Direct involvement:Participation in Inpatient roundsAvailable for outpatient / high risk clinicsFacilitate HITH/OPATHolistic & CVS disease care
What we need:Knowledge of plans from Pod, Endo, VascEnsure appropriate samples takenEnsure appropriate interventions occurGood information and record keeping
Thanks!