Cardiogenic shock — bacterial myocarditis (Staph, Strep, diphtheria, TB, meningococcal)
Encounter flow
12/12 authoredCanonical 12-phase frame with authored status for this dossier.
Frame
Bacterial myocarditis with cardiogenic shock — distinct from viral / autoimmune / Lyme by bacterial pathogen + targeted antibiotic therapy + AVOIDANCE of immunosuppression; identify etiology subgroup (Staph/Strep/diphtheria/TB/meningococcal/atypical) for tailored regimen
Bacterial myocarditis confirmed as working diagnosis with etiologic subgroup identified or empiric coverage started
Patient inputs (22)
Bacterial myocarditis can affect any age; diphtheria classic in <5 y or unvaccinated adults; TB more common in older / immunocompromised
Baseline for vancomycin trough monitoring + nephrotoxic agent dosing; AKI common in mixed shock
TB drug hepatotoxicity baseline; sepsis-related transaminitis; congestive hepatopathy from RV dysfunction
Diphtheria + meningococcal + pneumococcal + COVID-19 status drives risk; gaps suggest preventable etiology
Drives antibiotic selection — vancomycin alone if anaphylactic to beta-lactams; daptomycin alternative
Pulm congestion from LV dysfunction + ARDS from sepsis; intubation often needed
Elevated in active myocarditis; trend during recovery; pseudo-MI pattern possible
Elevated proportional to LV dysfunction; trends recovery on antibiotics
MANDATORY × 3 BEFORE antibiotics — identifies organism + drives targeted therapy; modified Duke criteria for endocarditis exclusion
Leukocytosis + left shift in bacterial; thrombocytopenia in TB / meningococcal / sepsis-DIC
Pseudo-MI ST changes, AV block (diphtheria / TB / Lyme overlap), arrhythmia; serial monitoring
LV function, RV strain, pericardial effusion (TB, meningococcal), valvular function (rule out IE), wall motion
Pulm congestion + cavitary lesions if TB + cardiomegaly + pericardial effusion silhouette
SCAI 2022 staging baseline; bacterial myocarditis CS often combined with septic shock — distributive + cardiogenic mixed picture
Tachycardia from sepsis + LV dysfunction; AV block in diphtheria / Lyme / TB myocarditis with conduction system involvement
Fever almost always present in active bacterial myocarditis; temp >38.5 = SIRS criterion + sepsis bundle activation
SCAI staging anchor + sepsis bundle marker; ≥2 = SCAI C+; ≥4 = severe shock
TB risk + immunocompromised classification; TB myocarditis more common in HIV+; affects treatment intensity
TB myocarditis screen if subacute presentation + endemic exposure / immunocompromised
Lake Louise criteria (T2/T1 mapping + LGE) for myocarditis confirmation + prognostication
Endemic region, household contact, prior treatment, BCG history; HIV co-infection risk
Atypicals — Coxiella (livestock), Brucella (unpasteurized dairy), Leptospira (water/rodents), Rickettsia (ticks/fleas)
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Severity triggers (6)
- informationallife_threateningsepsis_bundle_delay_with_bacterial_myocarditis_csFailure to start sepsis bundle (cultures + abx within 1 h) in bacterial myocarditis CS — every hour of antibiotic delay associated with ~7-8% mortality increaseTrigger could not be auto-evaluated — needs clinician judgement.
- informationallife_threateningimmunosuppression_error_in_bacterial_vs_autoimmune_myocarditis_confusionSteroids / immunosuppression mistakenly initiated in bacterial myocarditis (mistaking for autoimmune / giant-cell myocarditis) — worsens infection, sepsis progressionTrigger could not be auto-evaluated — needs clinician judgement.
- informationallife_threateningdiphtheria_antitoxin_window_emergent_cdc_contactDiphtheria suspicion → CDC stockpile equine antitoxin contact emergent; antitoxin only effective before tissue binding; do NOT delay for confirmationTrigger could not be auto-evaluated — needs clinician judgement.
- informationallife_threateningmeningococcal_sepsis_with_waterhouse_friderichsen_adrenal_crisisMeningococcemia with bilateral adrenal hemorrhage (Waterhouse-Friderichsen) → adrenal crisis + DIC + purpura fulminans + bacterial myocarditis componentTrigger could not be auto-evaluated — needs clinician judgement.
- informationalseverevaccination_history_failure_diphtheria_meningococcal_pneumococcalBacterial myocarditis traced to vaccine-preventable etiology in unvaccinated / under-vaccinated patient — diphtheria, meningococcal, pneumococcal, Hib; family / contact tracing + emergent vaccinationTrigger could not be auto-evaluated — needs clinician judgement.
- informationalseveremdr_organism_resistance_or_treatment_failureMultidrug-resistant organism (MRSA with reduced vancomycin susceptibility, MDR-TB, ESBL Strep) → treatment failure on initial empiric regimenTrigger could not be auto-evaluated — needs clinician judgement.
Workflow calculators
Run this disease's risk and dosing calculators inline.
Recommended regimen
Bacterial myocarditis CS — targeted antibiotics by organism + standard CS support; AVOID immunosuppression (distinct from autoimmune myocarditis)- vancomycinfirst lineglycopeptide25-30 mg/kg IV load then 15-20 mg/kg q8-12h titrate trough 15-20 µg/mL • IV • q8-12htriggers: empiric_bacterial_myocarditis_with_cs, mrsa_coverage_needed, staph_strep_coverageIDSA MRSA + AHA 2015 endocarditis (Baddour PMID 26373316) — first-line for MSSA/MRSA/Strep coverage in bacterial myocarditis with bacteremia; trough monitoring for nephrotoxicityrxcui 11124
- ceftriaxonefirst linecephalosporin_3rd_gen2 g IV q24h (q12h for meningitis) • IV • q24htriggers: empiric_bacterial_myocarditis_with_cs, meningococcal_disease, streptococcal_coverageEmpiric coverage for Strep, meningococcal, susceptible Staph; first-line for meningococcal myocarditis + meningitis (CDC 2024 guidance)rxcui 2193
- piperacillin-tazobactamsecond linebeta_lactam_beta_lactamase_inhibitor4.5 g IV q6-8h • IV • q6-8htriggers: hcap_risk_with_bacterial_myocarditis, broad_spectrum_needed, pseudomonas_riskBroader-spectrum empiric if HCAP / nosocomial source / pseudomonas risk; alternative to ceftriaxonerxcui 74169
- oxacillincomorbidity specificantistaphylococcal_penicillin2 g IV q4h • IV • q4htriggers: mssa_confirmed_on_cultureAHA 2015 endocarditis — anti-staphylococcal penicillin preferred for MSSA over vancomycin (better outcomes); narrow spectrum after culture confirms MSSArxcui 7773
- cefazolincomorbidity specificcephalosporin_1st_gen2 g IV q8h • IV • q8htriggers: mssa_with_mild_penicillin_allergy, cardiac_surgery_prepAHA 2015 endocarditis alternative to oxacillin for MSSA with mild PCN allergy; also for cardiac surgery prep if MCSrxcui 2180
- doxycyclinecomorbidity specifictetracycline100 mg PO/IV BID • PO/IV • BIDtriggers: atypical_pathogen_coverage, rickettsia_coxiella_chlamydia, lyme_overlap_considerationAtypicals (Coxiella Q-fever, Rickettsia, Chlamydia, Lyme overlap); IDSA 2021 Lyme PMID 33417672rxcui 3640
- erythromycinrescuemacrolide500 mg IV q6h × 14 days • IV • q6htriggers: diphtheria_confirmed_or_high_suspicion, mycoplasma_chlamydia_atypicalCDC diphtheria guidance — erythromycin or penicillin G for diphtheria; eradicate carriage; reduce toxin burdenrxcui 4053
- penicillin grescuenatural_penicillin2-4 million units IV q4h × 14 days • IV • q4htriggers: diphtheria_confirmed, rheumatic_carditis_with_strepCDC diphtheria + rheumatic carditis — penicillin G eradicates organism; for diphtheria, antitoxin is the primary therapy and antibiotics secondaryrxcui 7980
- rifampincomorbidity specificantimycobacterial_rifamycin600 mg PO daily • PO • dailytriggers: tb_myocarditis_confirmed, ripe_protocolWHO TB 2023 RIPE protocol — rifampin core agent; 2 mo intensive then 4 mo continuationrxcui 9384
- isoniazidcomorbidity specificantimycobacterial_inh300 mg PO daily + pyridoxine 25 mg • PO • dailytriggers: tb_myocarditis_confirmed, ripe_protocolWHO TB 2023 RIPE protocol — INH core agent with pyridoxine for neuropathy preventionrxcui 6038
- pyrazinamidecomorbidity specificantimycobacterial_pza15-30 mg/kg PO daily (max 2 g) • PO • dailytriggers: tb_myocarditis_confirmed_first_2_months, ripe_protocol_intensive_phaseWHO TB 2023 RIPE intensive phase × 2 mo; hepatotoxicity surveillance requiredrxcui 8987
- ethambutolcomorbidity specificantimycobacterial_emb15-25 mg/kg PO daily • PO • dailytriggers: tb_myocarditis_confirmed_first_2_months, ripe_protocol_intensive_phase, drug_resistance_uncertainWHO TB 2023 RIPE intensive phase × 2 mo; ophthalmology baseline for optic neuritis monitoringrxcui 4110
- norepinephrinefirst linevasopressor_alpha0.05–0.5 µg/kg/min titrate MAP ≥65 • IV • continuoustriggers: bacterial_myocarditis_cs_with_sbp_lt_90, mixed_septic_cardiogenic_shockSOAP-II PMID 20200382 — NE first-line in CS + septic shock; preferred over dopaminerxcui 7512
- dobutaminesecond lineinotrope_beta12.5–10 µg/kg/min titrate • IV • continuoustriggers: low_cardiac_output_with_bacterial_myocarditis, lv_dysfunction_with_shock_after_resuscitationCAUTIOUS in active myocarditis — arrhythmogenic; use only if persistent low CO after volume + NE optimizationrxcui 3616
- dexamethasonerescuecorticosteroid0.15 mg/kg IV q6h × 4 days (meningitis adjunct) • IV • q6htriggers: meningococcal_meningitis_concurrent, rheumatic_carditis_severe, tb_pericarditis_componentIDSA meningitis — dexamethasone with first dose of antibiotics in pneumococcal/meningococcal meningitis; AVOID routine immunosuppression in bacterial myocarditis (worsens infection — distinct from autoimmune myocarditis)rxcui 3264
outpatient playbook — drug actions (3)
- 1. continue GDMT 4-pillar if persistent EF<40rxcui 593411empagliflozin 10 mg + carvedilol + ARNi/ACEi + MRA at max tolerated • PO • as scheduledtrigger: Persistent EF<40 from myocarditisEMPULSE PMID 35347356; ACC/AHA 2022 HF Class I
- 2. taper GDMT if EF recoveredgradual taper if EF normalized for ≥6 months • PO • as scheduledtrigger: Sustained LV recoveryMany bacterial myocarditis fully recover; GDMT often time-limited unlike chronic HFrEF
- 3. complete TB RIPE / continuation phaserxcui 9384rifampin + INH × 4 mo continuation • PO • dailytrigger: TB myocarditis confirmedWHO TB 2023
Auto-drafted A&P note
outpatientSubjective
- Possible entry pathways: Cardiogenic shock + fever + signs of bacteremia → bacterial myocarditis suspicion (Staph, Strep, meningococcal); Recent severe pharyngitis (gray membrane) in unvaccinated patient + new carditis → diphtheria toxin myocarditis (medical emergency, antitoxin from CDC); Subacute carditis + constitutional symptoms + pericardial effusion in HIV-positive / immunocompromised → TB myocarditis evaluation.
Objective
- No vitals, labs, or imaging entered for this encounter.
Assessment
**Cardiogenic shock — bacterial myocarditis (Staph, Strep, diphtheria, TB, meningococcal)** (cardio.cardiogenic-shock.bacterial-myocarditis.v1). Phenotype framing: Bacterial subgroup identified (Staph vs Strep vs diphtheria vs TB vs meningococcal vs atypical); rule out viral (PCR), autoimmune (giant cell — EMB), drug-induced (clozapine, ICI), infiltrative (amyloid, sarcoid) Scope: Bacterial myocarditis with cardiogenic shock — distinct from viral / autoimmune / Lyme by bacterial pathogen + targeted antibiotic therapy + AVOIDANCE of immunosuppression; identify etiology subgroup (Staph/Strep/diphtheria/TB/meningococcal/atypical) for tailored regimen No severity triggers fired against current inputs.
Plan
Regimen axis: **Bacterial myocarditis CS — targeted antibiotics by organism + standard CS support; AVOID immunosuppression (distinct from autoimmune myocarditis)**. 1. vancomycin 25-30 mg/kg IV load then 15-20 mg/kg q8-12h titrate trough 15-20 µg/mL IV q8-12h (glycopeptide, first line) — IDSA MRSA + AHA 2015 endocarditis (Baddour PMID 26373316) — first-line for MSSA/MRSA/Strep coverage in bacterial myocarditis with bacteremia; trough monitoring for nephrotoxicity 2. ceftriaxone 2 g IV q24h (q12h for meningitis) IV q24h (cephalosporin_3rd_gen, first line) — Empiric coverage for Strep, meningococcal, susceptible Staph; first-line for meningococcal myocarditis + meningitis (CDC 2024 guidance) 3. piperacillin-tazobactam 4.5 g IV q6-8h IV q6-8h (beta_lactam_beta_lactamase_inhibitor, second line) — Broader-spectrum empiric if HCAP / nosocomial source / pseudomonas risk; alternative to ceftriaxone 4. oxacillin 2 g IV q4h IV q4h (antistaphylococcal_penicillin, comorbidity specific) — AHA 2015 endocarditis — anti-staphylococcal penicillin preferred for MSSA over vancomycin (better outcomes); narrow spectrum after culture confirms MSSA 5. cefazolin 2 g IV q8h IV q8h (cephalosporin_1st_gen, comorbidity specific) — AHA 2015 endocarditis alternative to oxacillin for MSSA with mild PCN allergy; also for cardiac surgery prep if MCS 6. doxycycline 100 mg PO/IV BID PO/IV BID (tetracycline, comorbidity specific) — Atypicals (Coxiella Q-fever, Rickettsia, Chlamydia, Lyme overlap); IDSA 2021 Lyme PMID 33417672 7. erythromycin 500 mg IV q6h × 14 days IV q6h (macrolide, rescue) — CDC diphtheria guidance — erythromycin or penicillin G for diphtheria; eradicate carriage; reduce toxin burden 8. penicillin g 2-4 million units IV q4h × 14 days IV q4h (natural_penicillin, rescue) — CDC diphtheria + rheumatic carditis — penicillin G eradicates organism; for diphtheria, antitoxin is the primary therapy and antibiotics secondary 9. rifampin 600 mg PO daily PO daily (antimycobacterial_rifamycin, comorbidity specific) — WHO TB 2023 RIPE protocol — rifampin core agent; 2 mo intensive then 4 mo continuation 10. isoniazid 300 mg PO daily + pyridoxine 25 mg PO daily (antimycobacterial_inh, comorbidity specific) — WHO TB 2023 RIPE protocol — INH core agent with pyridoxine for neuropathy prevention 11. pyrazinamide 15-30 mg/kg PO daily (max 2 g) PO daily (antimycobacterial_pza, comorbidity specific) — WHO TB 2023 RIPE intensive phase × 2 mo; hepatotoxicity surveillance required 12. ethambutol 15-25 mg/kg PO daily PO daily (antimycobacterial_emb, comorbidity specific) — WHO TB 2023 RIPE intensive phase × 2 mo; ophthalmology baseline for optic neuritis monitoring 13. norepinephrine 0.05–0.5 µg/kg/min titrate MAP ≥65 IV continuous (vasopressor_alpha, first line) — SOAP-II PMID 20200382 — NE first-line in CS + septic shock; preferred over dopamine 14. dobutamine 2.5–10 µg/kg/min titrate IV continuous (inotrope_beta1, second line) — CAUTIOUS in active myocarditis — arrhythmogenic; use only if persistent low CO after volume + NE optimization 15. dexamethasone 0.15 mg/kg IV q6h × 4 days (meningitis adjunct) IV q6h (corticosteroid, rescue) — IDSA meningitis — dexamethasone with first dose of antibiotics in pneumococcal/meningococcal meningitis; AVOID routine immunosuppression in bacterial myocarditis (worsens infection — distinct from autoimmune myocarditis) Setting playbook (outpatient) — 1-3 months follow-up — confirm sustained recovery on cardiac MRI (fibrosis assessment); GDMT continuation if persistent EF<40; complete TB therapy if applicable; vaccination maintenance; family screening; cardiac rehab completion 16. continue GDMT 4-pillar if persistent EF<40 empagliflozin 10 mg + carvedilol + ARNi/ACEi + MRA at max tolerated PO as scheduled — Persistent EF<40 from myocarditis (EMPULSE PMID 35347356; ACC/AHA 2022 HF Class I) 17. taper GDMT if EF recovered gradual taper if EF normalized for ≥6 months PO as scheduled — Sustained LV recovery (Many bacterial myocarditis fully recover; GDMT often time-limited unlike chronic HFrEF) 18. complete TB RIPE / continuation phase rifampin + INH × 4 mo continuation PO daily — TB myocarditis confirmed (WHO TB 2023) Non-pharmacologic actions: - Annual influenza + pneumococcal + COVID-19 + diphtheria booster if due (Tdap q10y) - Meningococcal vaccination if at-risk (asplenia, complement deficiency, military, college dorm) - Cardiac rehab maintenance phase - Family screening / vaccination if outbreak organism (diphtheria, meningococcal, TB) - Cardiology + ID quarterly visit - TB DOT completion if TB AVOID / contraindication checks: - Routine_immunosuppression_AVOID_in_bacterial_myocarditis (distinct from autoimmune myocarditis — worsens infection per ESC 2013 PMID 23824828 + AHA 2020 PMID 32200645) - Vancomycin_dose_adjust_in_renal_impairment (trough 15 20 µg/mL; nephrotoxicity surveillance) - Ceftriaxone_caution_severe_penicillin_anaphylaxis (~1 2% cross reactivity; vancomycin alone if severe) - Doxycycline_avoid_in_pregnancy_and_children_under_8 (tooth staining + bone effects) - Ripe_hepatotoxicity_surveillance (LFT q2 4 weeks; hold if AST/ALT >3x ULN with symptoms) - Ethambutol_ophthalmology_baseline_and_monthly (optic neuritis surveillance) - Dobutamine_arrhythmogenic_caution_in_active_myocarditis (use only after NE + volume optimization) - Diphtheria_antitoxin_horse_serum_anaphylaxis_risk (skin testing recommended; CDC stockpile only) - Meningococcal_close_contact_chemoprophylaxis_within_24h (rifampin or ciprofloxacin per CDC 2024) - Tb_isolation_negative_pressure_room_mandatory (until 3 negative AFB sputums)
Monitoring
Regimen monitoring: - continuous hemodynamics in cicu - daily lactate clearance trajectory - daily troponin and BNP trend - repeat blood cultures at 48-72h to confirm clearance - vancomycin trough q3-5 doses during titration - BMP and creatinine daily for vancomycin nephrotoxicity - LFT q2-4 weeks during RIPE TB therapy - ophthalmology monthly during ethambutol - CBC with diff q weekly during antibiotics - echo at 48-72h then at d/c for LV recovery - cardiac MRI at 3-6 months for fibrosis assessment - CK creatinine for daptomycin if used - contact tracing for diphtheria meningococcal TB within 24-72h - vaccination status review post recovery diphtheria pneumo meningo Setting (outpatient) monitoring: - Quarterly clinical + labs - Annual echo + cardiac MRI follow-up at 3-6 mo for fibrosis - TB clinic monthly during RIPE - Family contact tracing follow-up Follow-up plan: Cardiology + ID follow-up at 1-3 mo; cardiac MRI at 3-6 mo for fibrosis assessment + recovery confirmation; vaccination updates (diphtheria booster q10y; pneumococcal; meningococcal if at-risk); GDMT continuation if persistent EF<40; cardiac rehab; contact tracing for diphtheria / meningococcal / TB - Close-out criterion: Follow-up booked + recovery confirmation imaging scheduled + contact tracing initiated Monitoring phase: Continuous hemodynamics, daily lactate clearance, daily troponin + BNP trend, repeat blood cultures at 48-72 h to confirm clearance, daily BMP + LFT during antibiotics, vancomycin trough levels, AST/ALT during TB therapy, GDMT initiation if persistent EF<40 once euvolemic + off pressors ≥24 h
Disposition
Current setting: outpatient — 1-3 months follow-up — confirm sustained recovery on cardiac MRI (fibrosis assessment); GDMT continuation if persistent EF<40; complete TB therapy if applicable; vaccination maintenance; family screening; cardiac rehab completion Disposition criteria: - Sustained recovery + completed antibiotic course + vaccinations updated → annual primary care follow-up only - Persistent abnormality / chronic HFrEF → continued cardiology / ID specialist follow-up Escalation triggers (move to higher acuity): - Recurrent shock or new arrhythmia → ED + CICU - TB drug resistance → MDR-TB regimen + ID - New bacteremia / fever → ID + endocarditis re-workup - Persistent EF<40 at 6 months → cardiology long-term + chronic HFrEF management - Cardiac MRI fibrosis progression → advanced HF evaluation
Earlier-Return Triggers
Return-precaution thresholds (watch for): - [LIFE_THREATENING] Failure to start sepsis bundle (cultures + abx within 1 h) in bacterial myocarditis CS — every hour of antibiotic delay associated with ~7-8% mortality increase - [LIFE_THREATENING] Steroids / immunosuppression mistakenly initiated in bacterial myocarditis (mistaking for autoimmune / giant-cell myocarditis) — worsens infection, sepsis progression - [LIFE_THREATENING] Diphtheria suspicion → CDC stockpile equine antitoxin contact emergent; antitoxin only effective before tissue binding; do NOT delay for confirmation
Citations
- ESC 2013 myocarditis position statement (Caforio PMID 23824828); AHA 2020 Scientific Statement on Acute Myocarditis (PMID 32200645); CDC Diphtheria Clinical Guidance + 2024 vaccination schedule; CDC Meningococcal Disease Guidance + 2024 vaccination schedule; IDSA Lyme 2021 (Lantos PMID 33417672); WHO TB 2023; SCAI 2022 CS staging (Naidu PMID 35718438); SSC 2026 sepsis bundle [PMID:23824828](https://pubmed.ncbi.nlm.nih.gov/23824828/) - Cited evidence (PMID 32200645) [PMID:32200645](https://pubmed.ncbi.nlm.nih.gov/32200645/) - Cited evidence (PMID 33417672) [PMID:33417672](https://pubmed.ncbi.nlm.nih.gov/33417672/) - Cited evidence (PMID 35718438) [PMID:35718438](https://pubmed.ncbi.nlm.nih.gov/35718438/) - Cited evidence (PMID 38587234) [PMID:38587234](https://pubmed.ncbi.nlm.nih.gov/38587234/) Last reconciled with current guidelines: 2026-05-15.
- ESC 2013 myocarditis position statement (Caforio PMID 23824828); AHA 2020 Scientific Statement on Acute Myocarditis (PMID 32200645); CDC Diphtheria Clinical Guidance + 2024 vaccination schedule; CDC Meningococcal Disease Guidance + 2024 vaccination schedule; IDSA Lyme 2021 (Lantos PMID 33417672); WHO TB 2023; SCAI 2022 CS staging (Naidu PMID 35718438); SSC 2026 sepsis bundle — PMID:23824828
- Cited evidence (PMID 32200645) — PMID:32200645
- Cited evidence (PMID 33417672) — PMID:33417672
- Cited evidence (PMID 35718438) — PMID:35718438
- Cited evidence (PMID 38587234) — PMID:38587234