Physiology¶
- Perfused in systole and diastole
- RV dilation causes IV septum shifting/Functional TR
- RV Systolic Perfusion Pressure = Systolic BP * Pulmonary Artery Systolic Pressure
Etiology3¶
- Pulmonary Hypertension
- Acute
- PE, Any lung Disease, Alpha-agonists
- Chronic
- WHO Groups 1-5
- Acute
- RV Myocardial dysfunction/decompensation
- Negative Inotropes:
- Beta-Blockers
- Diltiazem, Verapamil
- Arrhythmia
- Atrial Fibrillation
- Bradycardia
- Septic Cardiomyopathy
- Post-Cardiac Arrest MI
- Right Ventricular MI
- S/p Cardiac Surgery
- Rare
- Myocarditis
- ARVC
- Sarcoidosis
- Negative Inotropes:
- Excessive Preload
- Hypervolemia
- TR
- AV Shunts/fistulas
- Increased Cardiac Demand (Systemic Vasodilation)
- Shock
- Medications
- Liver Failure
- Thiamine Deficiency
- Adrenal Crisis/Thyroid Storm
Failure¶
- Forward Failure
- RV fails to generate CO, causing Cardiogenic Shock
- Rare in isolation
- Backwards Failure
- RV fails to decongest the systemic venous system, leading to high CVP with systemic congestion
Stages¶
- Systemic Congestion
- Hypoperfusion w/o Frank Hypotension
- Congestive Encephalopathy
- Congestive Nephropathy
- Frank Hypotension with shock
Diagnostics¶
- EKG
- Acute
- RBBB
- Terminal Right-axis Deviation
- T-wave Inversion
- ST changes
- Chronic
- Tall R-wave in V1
- Terminal Right-axis Deviation
- RV Strain pattern: ST depression +/* T-wave inversion in V1-V4
- Acute
- TTE
- RV Dilation
- Normal: <~60% of LV
- Moderate RVD: RV ~60-100% of LV
- Severe RVD: RV > LV
- RV Septal flattening ("D" sign)
- Tricuspid Annular Plane Systolic Excursion (TAPSE)
- Measure of displacement of the lateral tricuspid annulus toward the apex during systole
- Apical 4-Chamber view with an M-mode
- Low values mean RV systolic dysfunction
- Single best indicator of RV systolic function at bedside
- Normal TAPSE: >17mm1
- Mild RV dysfunction: 10-17mm
- Moderate RV dysfunction: 5-10mm
- Severe RV dysfunction: <5mm>
- CVP
- IVC >2cm with lack of respirophasic variation suggests CVP is elevated
- IVC <2cm with respirophasic variation suggests CVP is ~0-5mm (normal)
- Pulmonary Artery Systolic Pressure (PASP)
- PASP = CVP + 4(Max TR jet in m/s)^2 2
-
35mm suggests PHTN
- RV Dilation
Management¶
- Correct Precipitating Factors
- Stop BBs/Vasodilators
- Manage Electrolytes
- Manage Primary Problem
- Manage Afib/Aflutter
- Aggressive Oxygenation
- Volume Management
- Perfuse (Map >65)
- "Squeeze and Diurese"
- For PHTN and Borderline MAP
- MAP = 60, CVP = 25, No UOP
- Add Vasopressor
- MAP = 75, CVP = 25, Good UOP
- Continue Pressor, Remove Fluid with Diuretics
- MAP = 75, CVP = 12, Good UOP
- Stop diuretic and pressors
- MAP = 65, CVP = 12, Good UOP
- Done
- MAP = 60, CVP = 25, No UOP
- Vasopressors
- For PHTN and Borderline MAP
- Refractory
- Inhaled Pulmonary Vasodilators
- Inotropes
- Indications to consider
- RV Systolic Failure
- Inadequate systemic perfusion
- BRadycardia
- Epinephrine
- Dobutamine
- Indications to consider
- VA ECMO