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Eduovisual

Cardiovascular

Cardiogenic shock: CCS-style management with vasoactives and mechanical support

Clinical Overview and When to Suspect Cardiogenic Shock

— Hemodynamic signature: SBP <90 mmHg for >30 min (or vasopressors to maintain it), cardiac index <2.2 L/min/m², PCWP >15 mmHg

— Lactate >2 mmol/L, oliguria (<0.5 mL/kg/hr), altered mentation, cool/mottled extremities

Acute MI (AMI-CS) — most common cause (~80%); LAD occlusion with large anterior STEMI is classic

— Mechanical complications post-MI: papillary muscle rupture, VSD, free wall rupture (days 3–7)

— Acute decompensated HF (chronic HFrEF tipping over)

— Fulminant myocarditis, takotsubo, peripartum cardiomyopathy

— Acute valvular catastrophe (endocarditis with regurgitation, prosthetic valve thrombosis)

— Arrhythmia-driven (VT storm, sustained bradyarrhythmia)

— RV infarct, massive PE (obstructive but managed CS-like)

— Post-MI patient who becomes hypotensive, cool, oliguric despite "adequate" volume

— Heart failure admission with rising creatinine, narrow pulse pressure, hyponatremia

— "Warm and dry" pressures normal but lactate climbing → early/pre-shock SCAI stage B

— A: At risk; B: Beginning (pre-shock, hypotension without hypoperfusion); C: Classic CS; D: Deteriorating despite initial therapy; E: Extremis/arrest

CCS pearl: On the CCS interface, the moment SBP drops with cool extremities and rising lactate post-STEMI, your next-five-minute orders are: IV access ×2, arterial line, central line, ECG, troponin, lactate, ABG, BNP, CXR, bedside echo, cardiology and cath lab consult. Do not waste a clock-tick on a fluid bolus before you've assessed volume status — most AMI-CS patients are already congested.

Cardiogenic shock (CS) = end-organ hypoperfusion from primary cardiac pump failure despite adequate or elevated filling pressures
Etiologies you must instantly consider:
When to suspect on the wards/ED:
SCAI SHOCK stages (must know for Step 3):
Solid White Background
Presentation Patterns and Key History

— Patients often describe a "crushing" feeling plus inability to lie flat

— Family may report new confusion or somnolence — this is hypoperfusion of the brain, not just "old age"

— Prolonged ischemic chest pain, prior CAD, diabetes, tobacco, family history

— STEMI with delayed presentation (>12 hours), anterior territory, prior infarct

— Post-PCI patient with recurrent pain → stent thrombosis until proven otherwise

— New harsh holosystolic murmur + thrill → VSD

— New apical systolic murmur, flash pulmonary edema → papillary muscle rupture (acute MR)

— Sudden PEA arrest, JVD, muffled tones → free wall rupture/tamponade

— Viral prodrome 1–2 weeks prior + young patient → fulminant myocarditis

— Recent emotional stressor, postmenopausal woman, apical ballooning → takotsubo

— Late pregnancy or <5 months postpartum → peripartum cardiomyopathy

— Chemotherapy (anthracyclines, trastuzumab), heavy alcohol, cocaine

— Recent initiation/uptitration of beta-blocker or non-DHP CCB in decompensated HF

— NSAIDs, negative inotropes

— Missed diuretic doses, dietary indiscretion

Key distinction: "Warm-and-wet" (congested, perfusing) versus "cold-and-wet" (congested, hypoperfused = classic CS) versus "cold-and-dry" (advanced low-output, often end-stage HF). The Forrester/Stevenson profile drives whether you reach for diuretic alone, inotrope, or both. Step 3 management: Cold-and-wet = inotrope + diuretic once MAP supports it; cold-and-dry = inotrope ± cautious fluid challenge; never blindly bolus a wet patient.

Core symptom cluster: dyspnea at rest, fatigue, chest pain or pressure, oliguria, confusion or agitation, near-syncope
Historical clues that point to AMI-CS:
Clues pointing to mechanical complication (3–7 days post-MI):
Clues for non-ischemic CS:
Medications to ask about:
Solid White Background
Physical Exam Findings and Hemodynamic Assessment

Narrow pulse pressure (<25% of SBP) — early hallmark of low stroke volume

— Tachycardia, though elderly or beta-blocked patients may be inappropriately normocardic

— Hypoxia from pulmonary edema

— S3 gallop (volume overload, elevated LVEDP)

— New murmurs: holosystolic at LLSB → VSD; apical radiating to axilla → acute MR

— Pulsus alternans in severe LV dysfunction

— JVD elevated; Kussmaul sign suggests RV infarct or tamponade physiology

— Hepatomegaly, pulsatile liver (TR), positive hepatojugular reflux

Bedside echo (POCUS): LV ejection fraction, RV size/function, IVC, pericardial effusion, regional wall motion, valvular catastrophe — do this within minutes

Arterial line for continuous MAP and to draw labs

Central venous catheter for vasopressor delivery and CVP trend

Pulmonary artery catheter (Swan-Ganz): now back in favor for CS — measures CI, PCWP, SVR, mixed venous O2; ESCAPE trial didn't show benefit in general HF, but observational data in CS support PAC use to guide therapy and escalation

MAP ≥65 mmHg, CI >2.2, PCWP 15–18, SvO2 >60%, lactate clearance

Board pearl: A cardiac power output (CPO) = MAP × CO / 451 of <0.6 W is the single strongest hemodynamic predictor of in-hospital mortality in CS — board questions love this number. Pair it with PAPi <1.0 to flag impending RV failure requiring RV mechanical support.

General appearance: diaphoretic, dusky, mottled knees (livedo reticularis is a hard sign of severe shock), somnolent or agitated
Vitals:
Cardiac exam:
Pulmonary: bilateral crackles, sometimes wheeze ("cardiac asthma")
Neck/abdomen:
Extremities: cool, clammy, delayed capillary refill (>3 sec); thready pulses
Hemodynamic assessment tools:
Hemodynamic targets you'll be asked to defend:
Solid White Background
Diagnostic Workup — Initial Labs, Imaging, ECG, Biomarkers

— STEMI localization: anterior (V1–V4, LAD), inferior (II/III/aVF, RCA), lateral (I/aVL/V5–V6)

RV infarct: ST elevation in V4R — always obtain right-sided leads with inferior STEMI

— Posterior MI: ST depression V1–V3 with tall R waves → obtain V7–V9

— LBBB with Sgarbossa criteria in suspected ischemic CS

— CBC, BMP, Mg, phosphate, LFTs (shock liver: AST/ALT in thousands, INR up)

Lactate and serial q2h to track resuscitation

BNP/NT-proBNP — elevated supports cardiac etiology of dyspnea/shock

— ABG with mixed venous gas if Swan in place — SvO2 <60% = inadequate CO

— Coags (INR, aPTT), type and screen (anticipate cath/surgery)

— TSH (myxedema can mimic), tox screen (cocaine, methamphetamine)

— Procalcitonin/blood cultures if sepsis on the differential

Step 3 management: In any hypotensive patient with chest pain, the very first orders are simultaneous ECG + IV access + troponin + bedside echo. Do not delay cath lab activation for advanced imaging when STEMI is on the ECG — door-to-balloon ≤90 minutes still applies; in CS, immediate revascularization regardless of time since symptom onset (CULPRIT-SHOCK paradigm — culprit-only PCI preferred).

ECG (within 10 minutes, repeat q15–30 min if evolving):
Troponin (high-sensitivity): serial at 0 and 1–3 hours; massive elevations suggest large infarct or myocarditis
Other labs (CCS order set):
Chest X-ray: pulmonary edema, cardiomegaly, widened mediastinum (rule out dissection), pneumonia
Bedside echo (TTE): EF, RV function, valves, effusion, IVC; repeat after stabilization
CT angiography: if dissection or PE suspected; PE can masquerade as RV-predominant CS
Solid White Background
Diagnostic Workup — Advanced and Confirmatory Studies

— Emergent in AMI-CS — diagnostic and therapeutic

CULPRIT-SHOCK trial (2017): culprit-lesion-only PCI superior to immediate multivessel PCI (lower 30-day mortality/RRT)

— Staged PCI of non-culprit lesions only after stabilization

— Confirms CS hemodynamics: CI <2.2, PCWP >15, SVR elevated

— Distinguishes from distributive shock (low SVR, high CO) and hypovolemic (low PCWP)

— Guides inotrope/pressor titration and mechanical circulatory support (MCS) decisions

— Calculates CPO and PAPi for escalation triggers

— Quantifies EF, RV function, regional wall motion

— Identifies mechanical complications: VSD (color Doppler shunt), papillary muscle rupture with flail leaflet, LV thrombus, tamponade

— TEE preferred for prosthetic valves, endocarditis, aortic dissection

CCS pearl: When you "advance the clock" in CCS for a CS case, do not let the patient sit in the ED beyond ~30 minutes — order transfer to cath lab or transfer to CICU explicitly. The grader rewards rapid disposition. Key distinction: Pre-shock (SCAI B) patients without hypoperfusion get aggressive monitoring and prep for escalation but may not need pressors yet; SCAI C/D requires immediate vasoactive support and MCS evaluation.

Coronary angiography:
Pulmonary artery catheter (Swan-Ganz):
Formal TTE (or TEE):
Cardiac MRI: after stabilization for suspected myocarditis (Lake Louise criteria), infiltrative disease, takotsubo confirmation
Endomyocardial biopsy: reserved for suspected giant cell myocarditis, eosinophilic myocarditis, or unexplained fulminant CS in young patient — changes management (immunosuppression)
Right heart catheterization to formally stage and to qualify patients for advanced therapies (transplant, durable LVAD)
CT chest with PE protocol: if obstructive shock from PE is plausible (sudden hypoxia + RV strain on echo + clear lungs)
Solid White Background
Risk Stratification and First-Line Management Logic

Stage A (At risk): large MI, decompensated HF without hypotension → monitor, treat underlying disease

Stage B (Beginning): hypotension or tachycardia without hypoperfusion → cautious fluids if dry, early consult

Stage C (Classic): hypoperfusion needing pharmacologic/mechanical support → vasoactives + revascularization

Stage D (Deteriorating): failing initial therapy → escalate MCS, transfer to shock center

Stage E (Extremis): cardiac arrest/refractory → ECMO, consider futility discussions

— Airway: intubate if work of breathing failing or altered mentation; be cautious — induction can collapse hemodynamics (use etomidate or ketamine + push-dose epinephrine ready)

— Breathing: NIPPV (BiPAP) can reduce preload/afterload in pulmonary edema before intubation

— Circulation: arterial line, central line, vasopressor (norepinephrine first-line), inotrope (dobutamine if low CO with adequate MAP)

— Disability: glucose, neuro check

— Definitive: emergent cath lab for AMI-CS; OR for mechanical complications

— Most AMI-CS patients are euvolemic or congested — avoid reflexive boluses

— RV infarct is the exception: cautious 250–500 mL crystalloid challenges with reassessment

— Need for MCS beyond IABP, refractory shock, mechanical complication, transplant/LVAD candidacy

Board pearl: Norepinephrine beats dopamine in CS — the SOAP II trial showed dopamine caused more arrhythmias and a mortality signal in the CS subgroup. Default vasopressor in CS = norepinephrine; default inotrope = dobutamine or milrinone (the latter if on chronic beta-blockade or pulmonary hypertension).

SCAI SHOCK staging drives intensity of intervention:
The "shock team" model: multidisciplinary (interventional cardiology, CT surgery, HF/transplant, CICU, perfusion) — improves outcomes; mobilize early
Initial bundle (first 60 minutes):
Volume strategy:
Transfer criteria to tertiary/shock center:
Solid White Background
Pharmacotherapy — Vasoactives, Inotropes, and Adjuncts

— Start 0.05 μg/kg/min, titrate to MAP ≥65

— α1 (vasoconstriction) > β1 (modest inotropy); less arrhythmogenic than dopamine/epinephrine

— β1 agonist → ↑ contractility and ↑ HR; mild β2 vasodilation (can drop SBP)

— Start 2.5–5 μg/kg/min; useful when MAP is adequate but CO low

— Tachyphylaxis after 72 hours; arrhythmogenic

— Inotrope + pulmonary and systemic vasodilator — "inodilator"

— Preferred when RV failure, pulmonary hypertension, or chronic beta-blockade

— Renally cleared — reduce dose in CKD; long half-life means hypotension is hard to reverse

— Reserved for refractory shock or peri-arrest; ↑ lactate, arrhythmias, mortality signal vs norepi+dobutamine in CS (OptimaCC trial)

Aspirin 325 mg + P2Y12 inhibitor (ticagrelor or prasugrel) for AMI-CS

Heparin (UFH preferred for cath/MCS) — anticoagulation for AMI and for MCS circuits

Statin (high-intensity atorvastatin 80 mg)

Diuretics (IV furosemide) once MAP supports — relieves congestion; can also use ultrafiltration if diuretic-resistant

Hold beta-blockers, ACE-I/ARB, MRA acutely; reintroduce after stabilization

Avoid nitroprusside and high-dose nitrates if hypotensive

Step 3 management: The exam-favored pairing for AMI-CS with hypotension and pulmonary edema is norepinephrine + dobutamine + emergent PCI ± IABP/Impella. CCS pearl: Always order continuous telemetry, q1h vitals, q2h lactate, strict I/Os, daily weights, and a follow-up echo at 24–48h when titrating vasoactives.

Norepinephrine (first-line vasopressor):
Dobutamine (first-line inotrope):
Milrinone (PDE3 inhibitor):
Epinephrine:
Vasopressin: adjunct to norepinephrine when refractory; useful in RV failure (pulmonary-sparing vasoconstriction)
Dopamine: avoid in CS — more arrhythmias and worse outcomes (SOAP II)
Adjunctive medications:
Solid White Background
Procedures — Revascularization and Mechanical Circulatory Support

Primary PCI is first-line regardless of symptom onset time (Class I)

CABG if multivessel disease unsuitable for PCI or mechanical complication requiring surgery

Fibrinolytics only if PCI unavailable within 120 minutes AND no contraindications — inferior to PCI in CS

Culprit-only PCI per CULPRIT-SHOCK

Intra-aortic balloon pump (IABP):

— Reduces afterload, augments diastolic coronary perfusion

IABP-SHOCK II trial: no mortality benefit in AMI-CS → no longer routine, but still used as bridge or in mechanical complications (VSD, acute MR)

Impella (CP, 5.5, RP):

— Axial flow pump across aortic valve; unloads LV; provides 3.5–5.5 L/min

— Use in refractory CS or as PCI support (Protected PCI)

— Complications: hemolysis, limb ischemia, bleeding, stroke

VA-ECMO:

— Full cardiopulmonary support; for biventricular failure, refractory CS, peri-arrest (ECPR)

— Risk: LV distension — often need LV venting with IABP or Impella ("ECPELLA")

— Complications: bleeding, limb ischemia, stroke, Harlequin/North-South syndrome (upper-body hypoxia in peripheral femoral VA-ECMO with recovering native LV)

TandemHeart: trans-septal LA-to-femoral artery pump

Durable LVAD or heart transplant: for select patients not recovering — bridge-to-decision strategy

— VSD: surgical or percutaneous closure (high mortality if early)

— Papillary muscle rupture: emergent mitral valve replacement

— Free wall rupture: emergent surgical repair

Board pearl: DanGer Shock trial (2024) showed Impella CP reduced 6-month mortality in STEMI-CS vs standard care — a paradigm shift. CCS pearl: Order transfer to a shock/MCS-capable center if your facility lacks Impella/ECMO; document the indication.

Emergent revascularization (AMI-CS):
Mechanical Circulatory Support (MCS) — escalation ladder:
Surgical interventions:
Solid White Background
Special Populations — Elderly and Renal/Hepatic Impairment

— Higher baseline mortality in CS, but age alone is not a contraindication to PCI or MCS

SHOCK trial subgroup: benefit of early revascularization in <75; for ≥75, individualize (frailty, functional status, goals of care)

— Beware of atypical presentations: confusion, falls, weakness instead of chest pain

— Polypharmacy: beta-blockers, CCBs may blunt tachycardic response

— Higher bleeding risk on dual antiplatelet + anticoagulation — consider radial access, shorter DAPT duration discussions post-stabilization

— Contrast-induced nephropathy risk in PCI — do not withhold lifesaving angiography; minimize contrast, use isotonic saline pre/post

Milrinone is renally cleared — reduce dose or avoid in CKD/AKI

— Dobutamine and norepinephrine are not significantly renally cleared

— Loop diuretics: higher doses needed in CKD; consider CRRT for diuretic-resistant volume overload with hemodynamic instability

— Hold ACE-I/ARB/MRA in AKI; reintroduce carefully once stable

— Transaminases in thousands + INR up = ischemic hepatitis from low CO — resolves with restored perfusion

— Avoid hepatotoxic drugs; adjust amiodarone, lidocaine dosing

— Coagulopathy increases procedural bleeding — correct only for active bleeding or pre-procedure

Step 3 management: In an 82-year-old with anterior STEMI and CS, the right answer remains emergent PCI + norepinephrine + dobutamine, with early goals-of-care conversation documented. Key distinction: Functional status before admission predicts post-CS recovery more than chronologic age — get a collateral history from family.

Elderly (≥75 years):
Renal impairment / AKI:
Hepatic impairment / shock liver:
Frailty assessment: Clinical Frailty Scale informs MCS/transplant candidacy
Solid White Background
Special Populations — Pregnancy, Peripartum, and Younger Adults

— New HF with LVEF <45% in last month of pregnancy or up to 5 months postpartum, without other cause

— Risk factors: multiparity, advanced maternal age, preeclampsia, African ancestry

— Treatment: standard HF therapy except in pregnancy — avoid ACE-I/ARB/ARNI/MRA (teratogenic); use hydralazine + nitrates + beta-blocker (metoprolol or carvedilol)

Bromocriptine (prolactin inhibitor) — emerging evidence; controversial, suppresses lactation

— Anticoagulation if EF <35% (high thrombotic risk peripartum)

— Future pregnancies: high recurrence risk if EF doesn't normalize

— Spontaneous coronary artery dissection (SCAD) — most common cause of pregnancy-associated MI; conservative management often preferred over PCI

— Amniotic fluid embolism, pulmonary embolism

— Severe preeclampsia/eclampsia with cardiac dysfunction

— Causes: congenital heart disease, viral myocarditis, arrhythmias, sepsis with cardiac dysfunction

— Weight-based dosing; milrinone and epinephrine commonly used

— ECMO is established rescue therapy

— Think myocarditis, cocaine/methamphetamine, SCAD, congenital coronary anomalies, familial cardiomyopathy

— Always send toxicology, viral studies, consider cardiac MRI after stabilization

— Genetic counseling for familial DCM

Board pearl: A 32-year-old G3P3 woman 2 months postpartum with new dyspnea, EF 25%, pulmonary edema = PPCM until proven otherwise — give furosemide + hydralazine + metoprolol + anticoagulation; ACE-I only after breastfeeding stops or use enalapril/captopril (compatible with breastfeeding) if benefit outweighs risk.

Peripartum cardiomyopathy (PPCM):
Pregnancy-related CS — other causes:
Delivery considerations: multidisciplinary (cardiology, OB, anesthesia, neonatology); urgent delivery if maternal CS refractory
Pediatric CS:
Young adults (<50) with CS:
Solid White Background
Complications and Adverse Outcomes

Papillary muscle rupture → acute severe MR, flash pulmonary edema, new apical murmur → emergent surgery

Ventricular septal rupture → new harsh holosystolic murmur with thrill, RV failure, step-up in O2 sat on RHC → surgical/percutaneous closure

Free wall rupture → tamponade, PEA arrest → emergent pericardiocentesis + surgery; mortality >90%

LV pseudoaneurysm → contained rupture; surgical repair

VT/VF in ischemia → defibrillation, amiodarone, lidocaine, urgent revascularization

AV block in inferior MI → atropine, transcutaneous/transvenous pacing

— Electrical storm may require sedation, beta-blockade, stellate ganglion block, VA-ECMO

AKI (cardiorenal syndrome type 1) — common; may require CRRT

Ischemic hepatitis (shock liver) — transaminases >1000, resolves with reperfusion

Mesenteric ischemia — out-of-proportion abdominal pain, rising lactate

Stroke — embolic from LV thrombus or MCS-related

Anoxic brain injury post-arrest — TTM (targeted temperature management 32–36°C × 24h)

— Bleeding, hemolysis (Impella, ECMO), limb ischemia (femoral cannulation), DIC, infection, Harlequin syndrome (VA-ECMO), aortic insufficiency progression

CCS pearl: When a post-MI patient suddenly worsens with new murmur and hypotension on day 4, immediately order STAT echo, surgery consult, IABP placement, and transfer to OR — don't waste a clock tick on more diuretics. Key distinction: New systolic murmur + step-up on Swan = VSD; new murmur + flash pulmonary edema + no step-up = papillary muscle rupture.

Mechanical complications of AMI (days 3–7, sometimes earlier with reperfusion):
Arrhythmic complications:
End-organ damage:
MCS-specific:
Late complications: chronic HF, recurrent CS, post-cardiotomy syndrome, depression/PTSD
Solid White Background
When to Escalate Care — ICU, Consults, and Transfer

Interventional cardiology for emergent cath

CT surgery for mechanical complications or MCS implantation

Advanced HF/transplant cardiology for refractory CS or pre-shock with worsening trajectory

Critical care for ventilator, sedation, CRRT

Palliative care early — for symptom management and goals-of-care, not just end-of-life

— Rising lactate despite norepi + dobutamine

— CPO <0.6 W, PAPi <1.0

— Worsening end-organ function (oliguria, encephalopathy, rising LFTs)

— Need for >2 vasoactive agents

— Recurrent arrhythmias

— Cardiac cath lab with 24/7 capability

— Impella, ECMO, or surgical backup

— Advanced HF program for LVAD/transplant evaluation

— Use ground or air transport with MCS-trained team — Impella and ECMO can be transported

— Single page activates IC, CT surgery, HF, CICU, perfusionist

— Centers with shock teams show mortality reduction (~20–30% improvement)

— Update q4–6h or with major change; document goals of care; involve surrogate decision-maker

Step 3 management: Refractory CS with rising lactate on norepi + dobutamine at a non-MCS center = call shock team, prepare for transfer, start Impella or VA-ECMO if available, do not delay. CCS pearl: Document "transferred to tertiary CICU for advanced mechanical circulatory support evaluation" — this is the kind of disposition phrasing the case rewards.

CICU admission is mandatory for any patient with confirmed or suspected CS — never floor-level
Consults to mobilize immediately:
Escalation triggers (SCAI C → D):
Transfer to shock/MCS center if your facility lacks:
Shock team activation:
Family communication:
Solid White Background
Key Differentials — Other Cardiogenic Causes

— Chronic LV dysfunction tipped over by ischemia, arrhythmia, medication non-adherence, dietary indiscretion, infection

— Treatment overlaps but revascularization not the priority — diuresis + inotrope + cause-directed care

— Young patient, viral prodrome, rapid biventricular failure, often dramatic recovery with support

— Cardiac MRI, endomyocardial biopsy if giant cell suspected (steroids + immunosuppression)

— VA-ECMO often used as bridge to recovery (excellent prognosis if survives acute phase)

— Postmenopausal woman + emotional/physical trigger; apical ballooning; troponin mildly elevated

— Treatment: supportive; avoid inotropes if LV outflow tract obstruction present (paradoxical worsening); use phenylephrine + beta-blocker instead

— Usually resolves in 4–8 weeks

— Endocarditis with leaflet destruction → acute MR/AR

— Prosthetic valve thrombosis → fibrinolytics or emergent surgery

— Aortic dissection extending to coronaries or aortic valve

— VT storm, sustained SVT, complete heart block — restore rhythm and rate first

— Tachycardia-induced cardiomyopathy

— Technically obstructive, but presents similarly; pulsus paradoxus, equalized diastolic pressures

— Pericardiocentesis is curative

— Avoid inotropes/diuretics; give fluids + phenylephrine + beta-blocker

Key distinction: Takotsubo and HCM with obstruction are the two "do-not-give-dobutamine" CS mimics — inotropes worsen LVOT obstruction. Always check for systolic anterior motion (SAM) on echo before reflexively starting dobutamine.

Acute decompensated HFrEF (without acute MI):
Fulminant myocarditis:
Takotsubo (stress) cardiomyopathy:
Acute valvular catastrophe:
Arrhythmia-mediated CS:
Pericardial tamponade:
Hypertrophic cardiomyopathy with dynamic obstruction:
Solid White Background
Key Differentials — Non-Cardiogenic Shock

— Warm extremities, low SVR, high CO (early), wide pulse pressure

— Treatment: fluids first, then norepinephrine, source control

— Mixed septic + cardiogenic ("septic cardiomyopathy") is common — echo reveals depressed EF

— Hemorrhage (GI, trauma, ruptured AAA), severe dehydration

— Low CVP, low PCWP, high SVR, narrow pulse pressure

— Treatment: blood products, fluids, source control; avoid pressors before volume

Massive PE: sudden hypoxia, RV strain on echo, elevated D-dimer, CT-PA confirms; treat with thrombolytics (tPA) or thrombectomy

Tamponade: muffled tones, JVD, pulsus paradoxus, echo shows effusion with RV diastolic collapse → pericardiocentesis

Tension pneumothorax: absent breath sounds, tracheal deviation, hyperresonance → needle decompression

— AMI + sepsis (e.g., pneumonia precipitating NSTEMI)

— CS with secondary SIRS from prolonged hypoperfusion → low SVR + low CO ("vasoplegic CS")

— Requires combination therapy: pressors + inotropes + antibiotics

— Refractory hypotension unresponsive to pressors; history of steroid use or autoimmune disease

— Stress-dose hydrocortisone 100 mg IV

Board pearl: The fastest bedside way to distinguish CS from other shocks is POCUS: depressed LV + dilated IVC = cardiogenic; collapsing IVC + hyperdynamic LV = hypovolemic/distributive; dilated RV with septal flattening = PE; pericardial effusion with RV collapse = tamponade. Step 3 management: Order bedside echo as part of initial undifferentiated shock workup — it changes management within minutes.

Distributive shock (septic, anaphylactic, neurogenic):
Hypovolemic shock:
Obstructive shock:
Mixed shock:
Adrenal crisis:
Solid White Background
Secondary Prevention, Discharge Medications, and Long-Term Plan

Dual antiplatelet therapy: aspirin 81 mg indefinitely + P2Y12 inhibitor (ticagrelor or prasugrel) for 12 months (longer if high ischemic risk, shorter if high bleed risk)

High-intensity statin: atorvastatin 80 mg or rosuvastatin 40 mg — LDL goal <55 mg/dL post-MI

Beta-blocker: carvedilol, metoprolol succinate, or bisoprolol — titrate up after hemodynamic stability

ACE-I or ARB: lisinopril, ramipril, or losartan — start low, titrate

MRA: spironolactone or eplerenone if EF ≤40% with HF symptoms or diabetes

SGLT2 inhibitor: dapagliflozin or empagliflozin — class I for HFrEF regardless of diabetes

ARNI (sacubitril/valsartan): replaces ACE-I/ARB in HFrEF; wait 36h after ACE-I before starting

— Loop diuretic PRN for congestion

— GDMT for HFrEF (BB + ACE-I/ARB/ARNI + MRA + SGLT2i) until recovery

— Reassess EF at 3–6 months; if recovered, individualize whether to continue therapy

— Wait 40 days post-MI and 3 months post-revascularization to reassess EF

— If EF ≤35% with NYHA II–III on optimal GDMT → primary prevention ICD

Wearable defibrillator (LifeVest) bridge during waiting period

— Smoking cessation (varenicline, bupropion, NRT), Mediterranean diet, BP <130/80, A1c <7%, weight loss

Step 3 management: Every post-CS patient leaves with aspirin, P2Y12, statin, BB, ACE-I/ARB, MRA, SGLT2i, loop diuretic PRN, cardiac rehab referral, and 1–2 week follow-up.

Post-AMI-CS discharge regimen (Guideline-Directed Medical Therapy, GDMT):
For non-ischemic CS (myocarditis, PPCM, takotsubo):
ICD consideration:
Lifestyle:
Cardiac rehab: Class I recommendation — reduces mortality ~25%
Solid White Background
Follow-Up, Monitoring Parameters, and Counseling

7–14 days: primary care or HF clinic visit — medication reconciliation, symptom check, weight, BP, BMP (K+, creatinine on ACE-I/ARB/MRA)

30 days: cardiology follow-up — uptitrate GDMT, review adherence

3 months: repeat echo to reassess EF and guide ICD decision

6 months and annually: ongoing GDMT optimization, risk factor control

Daily weights at home — call clinic if gain >2 lb/day or >5 lb/week

— BP and HR log

— Symptoms: dyspnea, orthopnea, PND, edema, fatigue, palpitations

— Labs: BMP at 1–2 weeks after starting/uptitrating ACE-I/ARB/MRA/diuretic; A1c, lipids q3–6mo initially

— 36 sessions over 12 weeks, supervised exercise + education + risk factor modification

— Insurance-covered post-MI, post-PCI, post-CABG, HFrEF

— Reduces mortality, readmissions, improves QoL

Driving restrictions: post-MI without ICD = 1 week (private) / 1 month (commercial); post-ICD shock-eligible = 1 week if primary prevention, longer if secondary

Sexual activity: generally safe after stable exercise tolerance (~3–5 METs, e.g., 2 flights of stairs); avoid PDE5 inhibitors with nitrates

Travel: avoid air travel for 2 weeks post-MI; longer if complicated

Vaccinations: annual flu, pneumococcal, COVID, RSV (age-appropriate)

Depression screening (PHQ-9): prevalence 20–30% post-CS; treat with SSRI (sertraline preferred)

Board pearl: Cardiac rehab is one of the most underutilized Class I interventions — referring at discharge dramatically improves uptake. CCS pearl: Always order "cardiac rehabilitation referral" and "follow-up in 7–14 days" on the discharge order set.

Post-discharge follow-up cadence:
Monitoring parameters:
Cardiac rehabilitation:
Counseling:
Advance directives: revisit goals of care, ICD deactivation discussions if EF doesn't recover
Solid White Background
Ethical, Legal, and Patient Safety Considerations

— Patients are often encephalopathic, intubated, or peri-arrest — cannot consent

— Use surrogate decision-maker hierarchy (spouse → adult children → parents → siblings, varies by state)

— Emergency exception applies for lifesaving PCI/MCS — document the emergency

— When time allows, discuss MCS goals: bridge to recovery, bridge to decision, bridge to durable LVAD/transplant, or destination — patients and families must understand these

— Early palliative consult is not giving up — it improves symptom control and family support

— Discuss ICD deactivation in patients with advanced HF transitioning to comfort care — ICD shocks at end of life are distressing and inappropriate

— DNR status does not preclude PCI or vasoactives unless explicitly stated; clarify "DNR but full treatment otherwise" vs comfort-focused

— Ethically equivalent to withdrawal of other life-sustaining therapy

— Requires consensus among team, surrogate, and clarity of patient's prior wishes

— Document discussions thoroughly

Medication reconciliation is critical — CS patients leave on 8–10 new medications; errors in beta-blocker dosing, anticoagulation, and diuretics drive readmissions

— Warm handoff between CICU → step-down → floor → outpatient

— Teach-back method for discharge education (weight, symptoms, when to call)

30-day readmission penalties (CMS HRRP) apply to HF — discharge planning matters financially and clinically

Step 3 management: Document a goals-of-care conversation within 24–48 hours of CICU admission, identify the surrogate, and address ICD/MCS withdrawal contingencies proactively.

Informed consent in CS:
Goals-of-care and palliative integration:
Withdrawal of MCS:
Patient safety in transitions of care:
Mandatory reporting: cocaine/methamphetamine-induced CS in a pregnant patient may trigger state child welfare reporting — know your state law
Disparities: Black patients and women are less likely to receive MCS and transplant — address bias in shock team decisions
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High-Yield Associations and Rapid-Fire Clinical Facts

Board pearl: If the stem says "anterior STEMI + hypotension + clear lungs + elevated JVP" — think RV infarct extending from inferior MI or tamponade from free wall rupture, NOT volume depletion. Order right-sided ECG (V4R) and bedside echo immediately.

Most common cause of CS: acute MI, especially anterior STEMI from LAD occlusion
Mortality of AMI-CS: ~40–50% in-hospital despite modern therapy
SHOCK trial (1999): early revascularization superior to medical therapy in AMI-CS at 6 months and 1 year
CULPRIT-SHOCK (2017): culprit-only PCI > multivessel PCI
IABP-SHOCK II (2012): no mortality benefit of IABP in AMI-CS
DanGer Shock (2024): Impella CP reduces mortality in STEMI-CS
SOAP II: norepinephrine > dopamine (less arrhythmia, mortality signal in CS)
OptimaCC: epinephrine more harmful than norepi+dobutamine in CS
CPO <0.6 W and PAPi <1.0 = escalation triggers
SCAI SHOCK stages: A → E (At risk to Extremis)
RV infarct triad: hypotension + clear lungs + elevated JVP → fluids, avoid nitrates
Beck's triad (tamponade): hypotension, JVD, muffled heart sounds
Mechanical complications timing: papillary muscle rupture day 2–7; VSD day 3–5; free wall rupture day 3–7
Step-up in O2 saturation from RA to RV on RHC = VSD
Pulmonary edema + new apical murmur post-MI = papillary muscle rupture
Cold-and-wet = classic CS; cold-and-dry = end-stage low output
Norepinephrine + dobutamine = default CS pharmacotherapy
Milrinone: preferred in pulmonary HTN, RV failure, chronic BB use; renally dosed
Avoid dobutamine in takotsubo with LVOT obstruction or HCM — use phenylephrine
VA-ECMO + Impella ("ECPELLA") = LV venting strategy
Harlequin syndrome: upper-body hypoxia in peripheral VA-ECMO
PPCM: last month of pregnancy to 5 months postpartum
40-day post-MI wait before primary prevention ICD evaluation
Cardiac rehab: Class I, ~25% mortality reduction
30-day HF readmission penalties via CMS HRRP
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Board Question Stem Patterns

Key distinction: Questions test the trigger to escalate (vasoactive failure, rising lactate, CPO <0.6, PAPi <1.0) more than the initial choice of norepi/dobutamine — recognize the deteriorating patient and act.

Stem 1: 68 y/o man, anterior STEMI, BP 78/50, lactate 4, cool extremities, bilateral crackles. After ASA, heparin, P2Y12, what's next? → Emergent PCI + norepinephrine + dobutamine (not fluids, not IABP routinely)
Stem 2: Day 4 post-inferior MI, new harsh holosystolic murmur at LLSB with thrill, hypotensive. → VSD; STAT echo, IABP, CT surgery consult
Stem 3: Post-MI patient with flash pulmonary edema, new apical murmur radiating to axilla. → Papillary muscle rupture; emergent MVR
Stem 4: 32 y/o woman, 6 weeks postpartum, dyspnea, EF 25%, pulmonary edema. → PPCM; furosemide + hydralazine + metoprolol + anticoagulation (avoid ACE-I if breastfeeding without specific agent)
Stem 5: 25 y/o with viral prodrome, biventricular failure, EF 15%. → Fulminant myocarditis; supportive care, consider VA-ECMO, cardiac MRI, endomyocardial biopsy if giant cell suspected
Stem 6: Inferior STEMI + hypotension + clear lungs + elevated JVP. → RV infarct; cautious fluids, avoid nitrates/morphine, urgent PCI
Stem 7: Patient on norepi + dobutamine, lactate rising, CPO 0.5, PAPi 0.8. → Escalate to Impella or VA-ECMO; transfer to shock center
Stem 8: Postmenopausal woman after husband's death, chest pain, apical ballooning, mild trop elevation, normal coronaries. → Takotsubo; supportive, avoid dobutamine if LVOT obstruction, beta-blocker + phenylephrine
Stem 9: Choice of vasopressor in AMI-CS. → Norepinephrine (not dopamine)
Stem 10: CS with chronic carvedilol use, poor response to dobutamine. → Switch to milrinone
Stem 11: Discharge medications post-AMI-CS with EF 30%. → ASA + P2Y12 + atorvastatin 80 + carvedilol + ACE-I/ARB/ARNI + spironolactone + SGLT2i + loop diuretic + cardiac rehab
Stem 12: When to evaluate for primary prevention ICD post-MI? → ≥40 days post-MI, ≥3 months post-revascularization on optimal GDMT with EF ≤35%
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One-Line Recap

Cardiogenic shock is end-organ hypoperfusion from primary pump failure — most commonly from acute MI — and is managed by simultaneous norepinephrine + dobutamine, emergent culprit-only PCI when ischemic, and stage-appropriate escalation through IABP, Impella, and VA-ECMO at a shock-team center, followed by full guideline-directed medical therapy and cardiac rehabilitation.

Board pearl: The Step 3 winning move in any CS vignette is simultaneous resuscitation and definitive therapy — norepinephrine + dobutamine + cath lab activation in the same breath, never sequentially.

Recognize early: SBP <90, lactate >2, cool/oliguric/confused; stage with SCAI A–E; CPO <0.6 W and PAPi <1.0 are mortality predictors and escalation triggers
Treat immediately: norepinephrine first (SOAP II), dobutamine for low CO, milrinone if on chronic beta-blocker or pulmonary HTN; emergent culprit-only PCI for AMI-CS (CULPRIT-SHOCK); avoid dopamine and routine multivessel PCI
Escalate intelligently: IABP no longer routine (IABP-SHOCK II) but useful for mechanical complications; Impella CP shows mortality benefit (DanGer Shock 2024); VA-ECMO ± LV venting for biventricular or refractory shock; activate shock team early and transfer to MCS-capable center
Don't miss the mimics and complications: RV infarct (fluids, avoid nitrates), papillary muscle rupture and VSD (days 3–7 post-MI), tamponade, takotsubo with LVOT obstruction (no dobutamine), PPCM, fulminant myocarditis, massive PE
Plan the survivor's life: ASA + P2Y12 × 12 mo + high-intensity statin + BB + ACE-I/ARB/ARNI + MRA + SGLT2i + loop diuretic PRN; reassess EF at 40 days for ICD; cardiac rehab (Class I, ~25% mortality reduction); 7–14 day follow-up; address depression, driving, sexual activity, and goals of care
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