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Approach to the Critical Patient
Immediate threats
High-risk aortic stenosis presentation
Hypotension or shock
Fixed outflow obstruction physiology
Preload dependence
Acute pulmonary edema
Flash pulmonary edema
Rapid oxygenation failure
Exertional syncope
Malignant arrhythmia risk
Sudden cardiac death risk
Ongoing ischemic chest pain
Demand ischemia risk
Concomitant coronary disease risk
Monitoring and access
Resuscitation setup
Cardiac monitor and defibrillator pads
Immediate cardioversion capability
Pacing capability if bradyarrhythmia
Two large-bore IV lines
Rapid vasopressor initiation readiness
Blood product readiness if GI bleed on anticoagulation
Arterial line if unstable
Beat-to-beat blood pressure titration
Vasopressor and afterload management safety
Hemodynamic targets
Perfusion goals
Mean arterial pressure at least 65 mmHg
Coronary perfusion dependence
Avoid diastolic hypotension
Sinus rhythm priority
Atrial contribution to LV filling dependence
Atrial fibrillation intolerance
Heart rate avoidance zones
Tachycardia worsens filling time
Bradycardia worsens cardiac output
Immediate stabilization logic
Shock management
If hypotension with suspected severe aortic stenosis, vasopressor-first strategy
Phenylephrine infusion option
Norepinephrine infusion option
If pulmonary edema with preserved blood pressure, cautious diuresis
Small IV loop diuretic dosing
Frequent reassessment for hypotension
If unstable tachyarrhythmia, synchronized cardioversion
Atrial fibrillation with hypotension trigger
Ventricular tachycardia trigger
Consultation triggers
Early specialty activation
Cardiology for symptomatic severe aortic stenosis
Urgent echocardiography pathway
Valve team pathway for AVR planning
Cardiothoracic surgery or structural heart team for decompensation
TAVR candidacy screening
Bridge therapy discussion
History
Symptom profile
Aortic stenosis symptom pattern
Exertional dyspnea
Orthopnea
Paroxysmal nocturnal dyspnea
Exertional chest pain
Relief with rest
Angina equivalent
Exertional presyncope or syncope
Sudden collapse
Post-exertion episodes
Heart failure progression timeline
Rapid decline suggests severe disease
Recent hospitalization marker
Functional status and triggers
Functional limitation
Baseline METs estimate
Stairs tolerance
Walking distance
Symptom onset threshold
Low-level exertion symptoms
Rest symptoms
Risk factors and etiologies
Etiology clues
Age-related calcific disease
Older adult onset
Progressive course
Bicuspid aortic valve history
Murmur since youth
Family history of bicuspid valve
Rheumatic heart disease history
Prior rheumatic fever
Concomitant mitral disease
Prior mediastinal radiation
Hodgkin lymphoma history
Breast cancer radiation history
Comorbid conditions and meds
Comorbidity modifiers
Coronary artery disease history
Prior PCI or CABG
Prior myocardial infarction
Atrial fibrillation history
Anticoagulant use
Rate control drug use
Chronic kidney disease history
Contrast risk for CT planning
Volume sensitivity
Antihypertensive use
Recent dose increases
Orthostatic symptoms
Physical Exam
Cardiovascular findings
Classic aortic stenosis exam
Systolic ejection murmur
Right upper sternal border prominence
Radiation to carotids
Carotid pulse contour
Pulsus parvus et tardus
Delayed upstroke
Second heart sound changes
Soft or absent A2
Paradoxical splitting in advanced disease
Apical impulse
Sustained heaving apex
LV hypertrophy sign
Heart failure and perfusion
Congestion and perfusion
Lung exam
Crackles
Wheeze in pulmonary edema
Volume status
Elevated JVP
Peripheral edema
Peripheral perfusion
Cool extremities
Delayed capillary refill
Pitfalls
Examination limitations
Low-flow low-gradient severe aortic stenosis with softer murmur
Reduced stroke volume reduces murmur intensity
Severe disease despite modest auscultation
Obesity or COPD masking murmur
Poor acoustic transmission
Reliance on echo over auscultation
Differential Diagnosis
Exertional syncope and chest pain mimics
Life-threatening alternatives
Acute coronary syndrome
ICD-10 I21.9
Troponin-positive ischemia
Pulmonary embolism
ICD-10 I26.99
Pleuritic pain or hypoxemia
Aortic dissection
ICD-10 I71.00
Tearing pain or pulse deficit
Ventricular tachyarrhythmia
ICD-10 I47.2
Palpitations or sudden collapse
Murmur and obstruction mimics
Outflow obstruction differentials
Hypertrophic obstructive cardiomyopathy
SNOMED CT hypertrophic cardiomyopathy
Murmur increases with Valsalva
Subaortic membrane
Congenital LVOT obstruction
Younger patient clue
Supravalvular aortic stenosis
Williams syndrome association
Upper extremity hypertension clue
Dyspnea and pulmonary edema mimics
Pulmonary edema differentials
Acute decompensated heart failure nonvalvular
ICD-10 I50.9
Dilated cardiomyopathy pattern
COPD or asthma exacerbation
ICD-10 J44.1
Wheeze-predominant pattern
Pneumonia
ICD-10 J18.9
Fever and focal infiltrate
Laboratory Tests
Baseline and contributory labs
Core laboratory evaluation
High-sensitivity troponin for chest pain or dyspnea
Type 2 myocardial infarction pattern possibility
Serial change assessment
BNP or NT-proBNP for dyspnea
Heart failure support
Baseline for risk stratification
Complete blood count for anemia and infection
Anemia as angina trigger
Leukocytosis for infection trigger
Metabolic and renal assessment
Electrolytes and renal function
Sodium and potassium for arrhythmia risk
Hypokalemia trigger for ectopy
Hyperkalemia conduction risk
Creatinine and eGFR for diuretic dosing and contrast planning
CT planning constraint
AKI risk in decompensation
Secondary tests by presentation
Additional tests when indicated
Lactate for shock physiology
Global hypoperfusion marker
Trend with resuscitation
Coagulation studies for anticoagulated atrial fibrillation
Bleeding risk assessment
Periprocedural planning
Thyroid-stimulating hormone for new atrial fibrillation
Reversible trigger screening
Avoidance of missed hyperthyroidism
Diagnostic Tests
Scoring Systems
Echocardiographic severity classification
Severe high-gradient criteria
Peak aortic jet velocity at least 4.0 m/s
Mean transvalvular gradient at least 40 mmHg
Aortic valve area 1.0 cm2 or less
Low-flow low-gradient severe aortic stenosis framework
Stroke volume index 35 mL/m2 or less
Mean gradient under 40 mmHg
LVEF under 50 percent subgroup
Very severe aortic stenosis markers
Peak velocity at least 5.0 m/s
Mean gradient at least 60 mmHg
Procedural risk tools for valve intervention
STS risk estimate use case
Surgical risk stratification
Shared decision support
EuroSCORE II use case
Surgical mortality estimate
TAVR vs SAVR discussion input
MRI
Cardiac MRI roles
LV remodeling assessment
Fibrosis burden
Hypertrophy quantification
Alternative diagnosis evaluation
Infiltrative cardiomyopathy assessment
Myocarditis assessment
Contraindication considerations
Non-MRI compatible implants
Severe claustrophobia barrier
CT
Cardiac CT roles
TAVR procedural planning
Annulus sizing
Iliofemoral access mapping
Aortic valve calcium scoring
Severity support in discordant echo findings
Low-flow low-gradient clarification adjunct
Coronary assessment option
Coronary calcium burden
Anomalous coronary anatomy screening
Ultrasound
Echocardiography pathway
Transthoracic echocardiography key outputs
Peak velocity measurement
Mean gradient calculation
Aortic valve area estimation
LVEF assessment
LV hypertrophy assessment
Point-of-care ultrasound supportive findings
LV concentric hypertrophy
Reduced LV systolic function in advanced disease
B-lines for pulmonary edema
Plethoric IVC as congestion marker
Transesophageal echocardiography use cases
Poor transthoracic windows
Periprocedural planning support
Disposition
Admission and level of care
Hospitalization indications
Symptomatic severe aortic stenosis
Exertional syncope
Angina
Dyspnea or heart failure
Decompensated heart failure
Pulmonary edema
Need for IV diuresis or noninvasive ventilation
Hemodynamic instability
Hypotension
Vasopressor requirement
Malignant arrhythmia
Sustained ventricular tachycardia
Unstable atrial fibrillation
Higher-acuity placement triggers
ICU or step-down needs
Ongoing pressor titration
Recurrent ischemia
Respiratory failure risk
Transfer triggers
Need for urgent valve intervention
Lack of on-site TAVR or cardiac surgery
Outpatient pathway
Discharge pathway constraints
Asymptomatic mild or moderate aortic stenosis without decompensation
Stable vitals and oxygenation
No syncope history
Reliable follow-up within weeks
Cardiology appointment arranged
Echocardiography scheduled if not current
Treatment
General hemodynamic principles
Fixed obstruction physiology strategy
Preload optimization
Small fluid bolus option for hypotension
Avoid over-resuscitation in pulmonary edema
Sinus rhythm and rate control
Atrial kick preservation
Avoid tachycardia
Avoidance of abrupt afterload reduction
Nitrate caution
Aggressive vasodilator caution
Acute pulmonary edema
Pulmonary edema management
Noninvasive ventilation
CPAP or BiPAP for work of breathing reduction
Hemodynamic monitoring for preload reduction intolerance
Furosemide IV 20 mg
If loop diuretic naive, 20 mg to 40 mg option
If chronic loop diuretic use, at least home dose IV equivalent
Re-dose based on urine output and blood pressure
Nitroglycerin avoidance in severe aortic stenosis with marginal blood pressure
If used, small titrated doses with invasive monitoring
Stop if hypotension develops
Hypotension and shock
Vasopressor and inotrope strategy
Phenylephrine IV infusion 0.2 mcg/kg/min to 2 mcg/kg/min
Titrate every 2 minutes to perfusion
Bradycardia risk monitoring
Coronary perfusion support via diastolic pressure
Norepinephrine IV infusion 0.02 mcg/kg/min to 1 mcg/kg/min
Titrate every 2 minutes to mean arterial pressure goal
Tachyarrhythmia risk monitoring
Preferred when mixed distributive and cardiogenic features
Dobutamine IV infusion 2.5 mcg/kg/min to 20 mcg/kg/min
If low-output state with adequate blood pressure support
Titrate every 10 minutes to perfusion and urine output
Stop if significant tachycardia or ischemia
Arrhythmias
Atrial fibrillation management
If unstable, synchronized cardioversion
120 J to 200 J biphasic initial strategy
Escalation with repeated attempts
If stable, amiodarone IV 150 mg over 10 minutes
Then 1 mg/min for 6 hours
Then 0.5 mg/min for 18 hours
QT prolongation monitoring
If rate control needed and blood pressure tolerates, metoprolol IV 2.5 mg
Repeat every 5 minutes to total 15 mg
Avoid in cardiogenic shock without pressor support
Bradyarrhythmia management
If unstable bradycardia, transcutaneous pacing
Analgesia and sedation planning
Transvenous pacing preparation if refractory
Definitive therapy and bridging
Valve intervention pathway
Aortic valve replacement for symptomatic severe aortic stenosis
Class I recommendation in major society guidelines
Valve team evaluation for SAVR vs TAVR selection
Balloon aortic valvuloplasty as bridge option
Temporary gradient reduction
Use in cardiogenic shock or urgent noncardiac surgery setting
Concomitant coronary evaluation planning
Coronary angiography consideration in angina or risk factors
Revascularization coordination with valve strategy
Special Populations
Pregnancy
Pregnancy considerations
Maternal risk with severe aortic stenosis
Limited ability to augment cardiac output
Pulmonary edema risk during volume shifts
Medication safety constraints
ACE inhibitor and ARB avoidance
Warfarin fetal risk consideration if anticoagulation needed for atrial fibrillation
Delivery planning triggers
Multidisciplinary cardio-obstetrics involvement
Early anesthesia planning for hemodynamic stability
Geriatric
Older adult considerations
Calcific degenerative predominance
High comorbidity burden
Frailty assessment relevance for valve choice
Atypical symptom reporting
Functional decline without classic triad
Falls as syncope surrogate
Medication sensitivity
Diuretic over-response risk
Orthostatic hypotension risk
Pediatrics
Pediatric and congenital considerations
Congenital aortic stenosis
ICD-10 Q23.0
Critical neonatal aortic stenosis presentation
Bicuspid aortic valve surveillance
Aortopathy screening consideration
Family screening relevance
Intervention approaches
Balloon valvotomy common early strategy
Surgical approaches in complex anatomy
Background
Epidemiology
Epidemiology overview
Common valvular disease in older adults
Degenerative calcific predominance
Increasing prevalence with population aging
Bicuspid aortic valve contribution
Earlier onset stenosis
Associated aortopathy
Natural history landmarks
Long latent asymptomatic phase
Symptom onset predicts high risk without intervention
Pathophysiology
Mechanistic framework
Progressive valve leaflet calcification
Reduced cusp mobility
Fixed LV outflow obstruction
LV pressure overload response
Concentric hypertrophy
Diastolic dysfunction
Coronary perfusion mismatch
Increased myocardial oxygen demand
Reduced subendocardial perfusion
Decompensation pathways
Pulmonary edema from elevated filling pressures
Low-output shock in advanced disease
Therapeutic Considerations
Treatment principles
Medical therapy limitations
No medication reverses valve obstruction
Symptom control only
Valve replacement outcome impact
Symptom relief in severe disease
Survival benefit in symptomatic severe stenosis
TAVR vs SAVR selection concepts
Age and life expectancy considerations
Surgical risk and anatomy considerations
Patient values and durability tradeoffs
Patient Discharge Instructions
copy discharge instructions
Discharge counseling for aortic stenosis
Return immediately for red flags
Chest pain at rest or worsening
Fainting or near-fainting
New or worse shortness of breath
Waking up gasping for air
New leg swelling or rapid weight gain
Palpitations with dizziness
Activity guidance
Avoid strenuous exertion until cardiology review
Stop activity if chest pressure, dizziness, or breathlessness
Medication guidance
Avoid medication changes without clinician advice
Caution with nitrates or new blood pressure lowering agents if symptomatic
Follow-up requirements
Cardiology appointment scheduling
Echocardiography completion if not current
Bring medication list to follow-up
References
Guidelines and consensus
Major guideline sources
ACC/AHA guideline for valvular heart disease management
Severe aortic stenosis staging framework
Valve intervention recommendation framework
ESC and EACTS guidelines for valvular heart disease management
Severe high-gradient definition
Intervention recommended in symptomatic severe high-gradient aortic stenosis Class I Level B
Emergency ultrasound references
ACEP emergency ultrasound resources for shock and hypotension evaluation
POCUS as adjunct in undifferentiated shock
Serial ultrasound reassessment concept
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.