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Transcript of 1 Tuberculosis in Children with HIV/AIDS HAIVN Harvard Medical School AIDS Initiatives in Vietnam.
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Tuberculosis in Children with HIV/AIDS
HAIVNHarvard Medical School AIDS
Initiatives in Vietnam
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Learning Objectives
By the end of this session, participants should be able to:
Recognize clinical signs/symptoms suspicious for TB in HIV-infected children
Propose the appropriate work-ups and treatment for TB
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Epidemiology
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TB in Vietnam
Vietnam is among the 22 high burden countries that account for about 80% of new TB cases per year
In 2010, in the general population (including HIV positives): • The incidence is 180/100,000 • The prevalence is 334/100,000
The TB incidence in HIV positive patients is 43%
WHO Global TB Control Report 2011. www.who.int/tb/data
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TB in Children
About 1 million children (11%) develops TB annually
Children < 5, malnutrition, and HIV+ are most at risk for developing TB
Infants is at highest risk Almost children infected with TB by
active TB in adult Possibility infected with drug resistance
sourcesWHO fact sheet No104, March 2012
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TB in HIV-infected Children
HIV-infected infants:• have up to 24x higher risk of TB than non HIV-
infected HIV-infected children:
• are more likely to have extra-pulmonary TB or combination of PTB and EPTB
• have 4x higher risk of acquiring TB if CD4 < 15% Mortality rate is 6x higher among HIV-infected
children
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Interaction between TB and HIV
TB is one of the most common OIs among HIV-infected children in resource-limited countries
TB infection:• speeds the progression of HIV by increasing
viral replication• worsens immunological suppression in HIV
patients• More severe illness, difficulty of difference
diagnosis with other OIs HIV increases risk of:
• acquiring primary or reactivation TB• mortality among patients with TB
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Distributions of PTB and EPTB in HIV-infected Children
A C Hesseling et al. Outcome of HIV infected children with culture confirmed tuberculosis. Arch Dis Child 2005;90:1171–1174.
Pulmonary TB(PTB)
76%
Extrapulmonary TB (EPTB)
46%22%
PTB +EPTB
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Pulmonary TB in HIV-infected Children
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PTB in Children < 5 (1)
In young children <5, infection is primary
Infants exposed to TB will usually develop active disease
Miliary-meningeal TB is more frequent (about 5%)
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PTB in Children <5 (2)
Primary PTBProgressiveprimary TB
• large mediastinal or hilar lymph nodes with small parenchymal focus
• hilar adenopathy with lower lobe pneumonitis
• resembling acute pneumonia: acute onset variable CXR
patterns
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PTB in Adolescents
Resembles adult-type disease:• Fevers, productive cough, weight loss,
anorexia, hemoptysis• CXR with upper lobe infiltrates or
cavities
Mandell et al. Principles and practices of infectious disease. 7 th edition. Chapter 250Long et al. Principles and practices of pediatric infectious diseases. 3 rd edition. Chapter 134
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Clinical Presentations
Triad: fever, cough, weight loss
When these are present, TB should be sought for
Chronic cough
• unremitting cough not improving after a course of empirical antibiotics
• present for >14 days
Fever • body temperature of >38 °C for >14 days
Wasting
(weight loss or failure to thrive)•No weight gain•Weight for age < 2 z-score•Weight loss >5% since the last visit
Diarrhea • also a frequent symptom
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Diagnosis (1)
WHO. 2006
Strongly suggestive of TB if 3 or more are present:
Chronic symptoms
fever, cough, weight loss, diarrhea
Physical signs
malnutrition, clubbing, pallor, and other EPTB signs
Tuberculin skin test
positive tuberculin skin test (≥ 5mm)
Chest X-ray
primary complex, hilar adenopathy,cavity, miliary pattern, pleural effusion, any opacity or infiltration not explained by other disease
Household contact with TB
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Diagnosis (2)
Sputum or gastric aspirate x3, or specimens from affected sites• Sent for AFB staining, microscopy and
culture CXR PCR (sputum, liquid gastric, spinal
fluid…) negative did not exclude TB ESR or CRP CBC (to look for anemia) AST/ALT
Mantoux test or IDR tends to be negative in HIV+ children, and is not required for diagnosis
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Important Considerations in Diagnosis (1)
Young children often cannot produce sputum, instead require gastric aspiration
The rate of BK+ in gastric aspirate is about 25-50%
Most pediatric cases are sputum negative• Children >6 may have smear positive PTB
Suspect of TB in cases of prolonged respiratory infection
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Important Considerations in Diagnosis (2)
Send samples for mycobacterial culture or other new diagnostic methods (Gene Xpert) when possible
Mycobacterial culture is extremely useful to: • increase diagnostic yield (in smear
negative cases)• determine sensitivity• identify multi-drug resistance• differentiate between MTB and non-
tuberculous mycobacteria
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Consider drug resistant TB in children when:• Close contact with drug resistant source• Contact with TB patient who died when
on going treatment and suspected drug resistant TB (non-adherence, relapse, contact with MDR-TB patient)
• No response with essential TB drug• Contact with source who have sputum
positive after 2 month of DOTS
Important Considerations in Diagnosis (3)
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PTB X-ray (1)
Hilar lymphadenopathy without parenchymal infiltrate
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Hilar lymphadenopathy with minimal parenchymal infiltrate
PTB X-ray (2)
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PTB X-ray (3)
Hilar and mediastinal lymphadeno-pathy with parenchymal infiltrate
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PTB X-ray (4)
Right upper lobe infiltrate
Hilar lymphadenopathy (arrow)
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Extrapulmonary TB
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EPTB: Suggestive Signs (1)
EPTB present in more than 25 % of TB in children
Non-painful enlarged cervical lymphadenopathy with fistula formation
Meningitis not responding to antibiotic treatment
Gibbus, especially of recent onset (vertebral TB)
WHO 2006
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EPTB: Suggestive Signs (2)
Non-painful enlarged joint Fluid collection:
• Pleural effusion• Pericardial effusion• Distended abdomen with ascites
Signs of tuberculin hypersensitivity: • phlyctenular conjunctivitis• erythema nodosum
WHO 2006
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Lymph Node TB (1)
Most common form of EPTB Most common locations in HIV
patients: • Cervical/supraclavicular• Axillary • Abdominal
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Lymph Node TB (2)
Non-tender, firm, fixed to underlying tissue
Can spread to adjacent nodes resulting in a clustered mass
Over time, progress to an indurated, erythematous, non-tender node which can rupture with draining sinus
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Lymph Node TB: Example
3 year old girl with L cervical lymph node cluster of several month
Healed scars after treatment
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Abdominal TB Lymphadenitis
Clinical presentations
• Prolonged fevers (on and off)• Prolonged diarrhea (on and off)• Abdominal pain (non-specific)• Weight loss or poor weight gain• With/without:
peripheral lymph nodespulmonary TB
• Tend to have low CD4 count
DiagnosisUltrasound/CT:• enlarged para-aortic lymph nodes• mesenteric lymph nodes
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TB Meningitis (1)
• Fever• Headache• Vomiting• Drowsiness
progressing to lethargy to coma
• Nuchal rigidity
• Cranial nerve abnormalities
• Seizures• Hypertonia• Hemiplegia
Course is usually gradual over several weeks
Clinical presentation:
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TB Meningitis (2)
On imaging
• hydrocephalus• basal meningeal enhancement• tuberculoma• cerebral edema
CSF• lymphocytic, 10-500 cells/mm3 • protein to • glucose to
Dx
• PCR• stain and culture• better yield with higher volume of CSF
(10cc or more)
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Miliary TB
Clinical presentation:• Malaise, anorexia, weight loss with low
grade fever • Progressing to cough, rales, wheezing, • Hepatosplenomegaly • Generalized lymphadenopathy (50%) over
several weeks CXR: reticulovascular-miliary pattern Disseminated to CNS (meningitis) and
abdomen (peritonitis) in 20-40% of cases
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Pleural TB (1)
Uncommon in children < 6 Clinical presentation:
• Abrupt onset, with high fever, chest pain, shortness of breath
• Affected side with dullness to percussion and diminished breath sounds
Dx: Pleural fluid or pleural biopsy for culture. Stain of fluid has low sensitivity
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Pleural TB (2)
TB EmpyemaLymphadenopathy (thin arrows)Pleural effusion (thick arrows)
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Osteoarticular Disease (1)
Pott disease: lower thoracic and upper lumbar vertebrae • Low grade fever, restlessness, back
pain, refusal to walk• Surgery may be required for diagnosis
and treatment• XR: collapse and wedging of vertebral
body, angulation of the spine (gibbus)
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Osteoarticular Disease (2)
TB in hip, knee, elbow, ankle• Slow process, with mild pain, stiffness,
restrictive movement• Dx: synovial fluid for stain and culture
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Treatment
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Principle of TB treatment in children
Treatment started when TB is suspected Continuing the treatment until the TB
diagnosis is excluded Flowing DOTS Combination of TB drug:
• At least 3 drug in intensive phase • At least 3 drug in maintain phase
Respect dosage, regular, duration
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Regimen Indication
2RHEZ/4RH • For new TB at all forms
2SRHEZ/1RHEZ/5RHE
• Severe disease: miliary TB, TB meningitis…
• Relapse TB, failure with the first regimen, re-treatment after interruption
TB Treatment (1)
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TB Treatment (2)Recommended Doses of First-line Anti-TB of Adults and Children
Drug
Recommended Dose
Daily 3 times weekly
Dose and Range(mg/kg body
weight)
Maximum(mg)
Dose and Range
(mg/kg body weight)
Maximum(mg)
Isoniazid 5 (4-6) 300 10 (8-12) -
Rifampicin 10 (8-12) 600 10 (8-12) 600
Pyrazinamide 25 (20-30) - 35 (30-40) -
Ethambutol Children 20 (15-25)adults 15 (15-20)
- 30 (25-35) -
Streptomycin 15 (12-18) - 15 (12-18) -
WHO Management of TB in Children 2006
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Note
TB active when patient on ART• Attention with IRIS• Using ARV simultaneous with TB drug:
Switch NVP to ABC or EFV if possible With ART regimen include LPV/r: dosage of
Ritonavir=Lopinavir
• Cotrimoxazole prophylaxis
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Treatment monitoring
Clinical response and drug side-effects
Sputum smear:• Pulmonary TB smear (+):
At the end of 2nd,3rd, 5th, 7th(or 8th) month depending on regimen
• Pulmonary TB smear (-): At the end of 2nd & 5th
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Treatment monitoring (cont.)
Chest X-ray:• Repeat after 2-3 months of treatment• Hilar should persist up to 2-3 year after
treatment sucessful• Normally of chest X-ray: continue treatment
until finish the regimen duration Iris monitoring:
• Do not stop TB drug• Consider Corticosteroids
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IPT: Isoniazid preventive therapy
Indication:• HIV infected children > 12 months of
age: No evidence of active TB and No contact with TB patient
• HIV infected children < 12 months of age:
Only children who have contact with TB patient
Excluded active TB
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IPT: Isoniazid preventive therapyContraindication
Contraindication Presentation
absolute Allergy with INH in history:•Fever•Eruption •Hepatitis
Relative • Progressive hepatitis, cirrhosis
• Neuro-peripheric disease
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Isoniazid (INH) 10 mg/kg/day, maximum 300mg
daily Admission one time/day, on fixe time
and distance of meals Duration: 6 months Vitamin B6: 25mg daily
IPT: Isoniazid preventive therapyRegimen
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Key Points
Always include TB in the differential diagnosis of respiratory infections, prolonged fevers, or wasting
PTB’s clinical presentations include prolonged cough, fevers, and growth failure
Prolonged fevers, abdominal pain, diarrhea, and weight loss could be due to abdominal TB lymphadenitis
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Thank you!
Questions?