tb update 2003 jacqueline peterson tulsky, md with thanks to charles daley, md and robert jasmer, md...
TRANSCRIPT
TB Update 2003
Jacqueline Peterson Tulsky, MDwith thanks to Charles Daley, MD and Robert Jasmer, MD
SF TB control and SFGH Pulmonary Department
Or
www.cdc.gov/mmwr/
Summary of Points1. Latent Tuberculosis Infection (LTBI)1. Latent Tuberculosis Infection (LTBI)
• Rifampin and Pyrazinamide (PZA) for 60 doses
NOT RECOMMENDED ANY MORE
2. Active TB Treatment2. Active TB Treatment
• Avoid rifapentine
• Caution with twice weekly rifampin or rifabutin
• Stay calm in the face of immune reconstitution
TB Screening
Still important to do TB skin test on a
6-12 month routine basis Frequency tied to TB risk factors Symptom review, not x-ray for prior
PPD positives No anergy panels
Quantiferon™ (QFT)
Blood test looking for immune response to TB antigen
Not approved for HIV-infected persons
Not useful for diagnosing M. avium disease
Tuberculosis Screening Flowchart
Evaluate for active TB
At-risk person
Tuberculin test + symptom review
Negative Positive
Chest x-ray
Normal Abnormal
Treatmentnot indicated
Candidate for Rx of latent TB
Screening for TuberculosisChest Radiograph
• To screen for active TB you should still perform chest radiographs
Isoniazid Therapy for LTBI HIV (+) Patients
Location Regimens Reduction in TB
Haiti* 12 mo INH vs placebo 83%
Uganda 6 mo INH vs placebo 70%
Zambia* 6 mo INH2 vs placebo2 70%
Kenya* 6 mo INH vs placebo 40%
*These trials also included a TST (-) study arm in which no protection was observed
New Treatment of LTBI
Regimen Duration Interval Comments (months)
Isoniazid 9 Daily Preferred regimen Twice-wkly DOT necessary
Isoniazid 6 Daily Not for HIV+ Twice-wkly DOT necessary
Rifampin 4 Daily For INH-R
ATS/CDC AJRCCM 2000;161:S221
An immigrant was tested and found to be PPD positive. The follow-up chest xray was normal and the patient was recommended for LTBI
• Denied hepatitis history or alcoholism• Offered and accepted short course therapy
with 60 doses of Rifampin/PZA • Provided meds by DOT without complaints
until last week of therapy• Severe hepatitis requiring hospitalization
The patient had missed 2 clinic appointments during the course of treatment. No labs during the course of the Rifampin/PZA, should have had labs twice.
“However, because the patient did not speak English, comprehension might have been a barrier.”
New Guidelines For Treatment of LTBI
• April, 2000 – Safety and efficacy of 60 doses of Rifampin and PZA lead to its recommendation
• October, 2000 – 1 patient dies, surveillance starts
• October, 2000 to June, 2002 – Cohort data collected on Rifampin/PZA patients
Rifampin and PZA HepatoxicityIn 30 months ending June, 2003:
48 cases of severe liver injury – 37 recovered– 11 died
• Most deaths had onset of liver injury in 2nd month
• 2 deaths in HIV positive persons
CDC. MMWR, August 8, 2003
Rifampin/PZARifampin/PZA HepatotoxicityHepatotoxicity
Hepatotoxicity RIF/PZA INH OR* (95% CI) N=307 N=282
Grade 1/2/3 45 (15%) 30 (11%)
Grade 4† 9 (3%) 2 (1%) 8.05 (1.76-36.76)
Total 54 (18%) 32 (11%) 1.65 (1.00-2.75)
† Grade 4 toxicity - ALT ≥ 500 U/L or ≥ 250 with symptoms
Jasmer et al. Ann Intern Med 2002;137:640-647.
Treatment of LTBIAs of August, 2003
• Rifampin or Rifabutin and PZA for 60 doses is contraindicated in all patients needing treatment for LTBI.
(Rifampin or Rifabutin and PZA still okay for use in active TB with 1 or 2 other drugs.)
Treatment of LTBI(normal xray)
• HIV (–) persons– INH for 9 months is preferred over 6
• HIV (+) persons– INH for 9 months
• HIV (–) and HIV (+) persons– Rifampin for 4 months
Treatment of LTBIStable Fibrotic Scarring
• Acceptable regimens after active TB checked for include:– 9 mos of INH*
– 4 months of rifampin INH
*preferred in HIV+
ATS/CDC AJRCCM 2000;161:S221
Treatment of LTBIMonitoring
• Elimination of routine baseline and follow-up liver function tests, except:– HIV infection– Others with increase risk hepatitis
• Emphasis is on clinical monitoring for signs and symptoms of drug side effect
Treatment of LTBIMonitoring for INH-induced Hepatitis
Increased risk for hepatitis?*
Yes
Check baseline LFTs
Abnormal Normal
Monthly symptom review
< 4 X upper limit of normal
≥ 4 X upper limit of normal
No
Hold INHGive INH and repeat LFTs periodically
*HIV +Pregnant/postpartumChronic liver diseaseAlcohol abuse
Active TB and HIV
1. Ensuring completion of therapy is essential
2. Treatment of TB/HIV is the same as for HIV negative persons except:
Once-weekly rifapentine regimens cannot be used Twice-weekly rifampin or rifabutin should not be used if the CD4
cell count is < 100 cells/ul
3. Be alert for drug interactions and paradoxical reactions
Ensuring Completion 15 Essential
“The responsibility for successful treatment is clearly assigned to the public health program or private provider, not to the patient.”
“It is strongly recommended that the initial treatment strategy utilize patient-centered case management with an adherence plan that emphasizes direct observation of therapy.”
Adherence Related Concepts
Reach = Contact + Connect• Easy to Contact /Hard to Connect
ex: Homeless, IDUs, Street Youth, Inmates
• Hard to Contact/Easy to Connect ex: Undocumented immigrants, foreign language
Definitions
Corollaries of “Hard-to-Reach”
• Provider-resistant patients
• Patient-resistant providers
• Patient-resistant systems and
institutions* Rubel AJ and Garro LC. Public Health Reports, 1992;Vol 107
Treatment of Tuberculosis1. Four drugs until sensitivities of cultures back (RIPE)
2. Intitial phase: 3 drugs until 2 months passes
3. Continuation phase: 2 drugs (usually ____ and ______) for 4 or 7 months
Continuation phase usually becomes two or three times a week dosing…..UNLESS ADVANCED HIV
Treatment of Tuberculosis1. RIPE –
Rifampin/Isoniazid/Pyrazinamide/Ethambutol
2. Intitial phase: 3 drugs RIP
3. Continuation phase: 2 drugs RI
Continuation phase usually becomes two or three times a week dosing…..UNLESS ADVANCED HIV
Treatment of HIV and TB
Strongly recommend daily therapy if CD4 count <100 cells/ml
HIV positive at any stage of infection - The continuation phase of treatment with weekly (yes weekly!) Rifapentine and INH NOT recommended
HIV and TB Drug-Drug Interactions
• Antiretroviral Drugs and TB drugs– NRTIs and NRSI okay
– NNRTI and PIs some interaction due to liver metabolism
TB and HIV Drug-Drug Interactions
Rifamycins
Decrease in PIs and NNRTIs(L & S on speed)
Rifampin > rifapentine > rifabutin
Inducersof
CYP3A
Increase in serum concentration
rifabutin*(L & S after lunch)
Delavirdine and PIs
Inhibitorsof
CYP3A
*Rifampin and rifapentine are not substrates of CYP3A
TB and HIV Drug-Drug Interactions
Protease Inhibitor Rifabutin Antiretroviral Regimen Dose DoseNelfinavir, indinavir, 150 mg daily or nelfinavir-consider to or amprenavir* 1500 mg q12hr
300 mg intermittently indinavir-consider to 1000 mg q 8hrs amprenavir-no change
Saquinavir* 300 mg daily or No change intermittently
Ritonavir** 150 mg biw No change
Lopinavir/ritonavir** 150 mg biw No change
*+ 2 nucleosides
** + 2 nucleosides and/or NNRTI Burman and Jones. AJRCCM 2001;162:7
Treatment of HIV-related TuberculosisDrug-Drug Interactions
Antiretroviral Rifabutin Antiretroviral Regimen Dose DoseNonnucleosides Efavirenz* 450-600 mg daily or biw No change
Nevirapine* 300 mg daily or intermittently No change
Nucleosides 2-3 nucleosides 300 mg daily or biw No change
PI + NNRTI Efavirenz or nevirapine 300 mg daily or biw Consider + PI (except ritonavir) dose of indinavir
* + 2 nucleosides Burman and Jones. AJRCCM 2001;162:7
HIV and TB Drug-Drug Interactions
• Rifampin-based regimens:
– Ritonavir (600 mg bid) + Normal dose Rifampin (600 mg)
– Efavirenz (800 mg daily) + Normal dose Rifampin (600 mg)
– Do not use rifampin with low-dose ritonavir/PI combinations.
Burman and Jones. AJRCCM 2001;162:7
35 year old woman with AIDS and CD4 of 45 developed active TB. Treated with 4 drug, then 3 drugs for 1 month by DOT.
Thoughtful HIV specialist saw pt, they agreed together to start AZT/3TC/Indinavir.
TB clinic changed patient from _________ to ________ and decreased the dose by half.
In follow-up after 1 more month, patient decreased from 3 drugs to 2 drugs for TB.
4 months after initial diagnosis, the TB staff note patient coughing, losing weight and finally has a fever. Chest x-ray shows recurrent TB infection.
What is the key question in this patient’s medication history?
TB and HIV Drug-Drug InteractionsProtease Inhibitor Rifabutin Antiretroviral Regimen Dose DoseNelfinavir, indinavir, 150 mg daily or or amprenavir* 300 mg intermittently indinavir-consider to
1000 mg q 8hrs
SO, if NOT TAKING Indinavir, Rifabutin dose IS TOO LOW.
TB resistance can develop within 30 days if on single drug therapy!!
MUST COORDINATE HIV and TB MEDS
Treatment of HIV and TB
On HAART
No Yes
CD4 <200 CD4 200-350 CD4 > 350
BeginHAARTin 2 wks
Start 4-drugTB regimen
BeginHAARTin 2 mos
No HAART
Continueand adjust dosages
Paradoxical ReactionsImmune Restoration Syndromes
• Paradoxical reaction - transient worsening of condition after initiation of treatment; not the result of treatment failure
• Common manifestations (new or worsening):– Adenopathy – Pulmonary infiltrates– Serositis– Cutaneous or CNS lesions (spots)
Paradoxical ReactionsImmune Restoration Syndromes
• Three case series: 6-36% occurrence
• Median 15 days after starting ARV therapy
• Most patients have advanced HIV disease– median CD4 cell count of 35 cells/ mm3
– median viral load > 500,000 copies/ml
Paradoxical ReactionsManagement
• Diagnosis of exclusion– Treatment failure, drug toxicity, other infection– Often start treatment for presumed relapse or
reactivation
• Severe reactions– Corticosteroids or– Hold ARV therapy (Controversial)
Extra pulmonary TB Disease
• More common as HIV advances• Be sure to rule out pulmonary disease
• Guidelines recommend 9-12 months in patients with:– Meningeal TB
• Corticosteroids may be useful in some forms of extrapulmonary TB
Summary of Points1. Latent Tuberculosis Infection (LTBI)1. Latent Tuberculosis Infection (LTBI)
• Rifampin and PZA for 60 doses
NOT RECOMMENDED ANY MORE
2. Active TB Treatment2. Active TB Treatment
• Avoid rifapentine
• Caution with twice weekly rifampin or rifabutin
• Stay calm in the face of immune reconstitution