Right Ventricular Failure

Right Ventricular Failure 

Introduction

The right ventricle is unable to provide adequate forward flow into the pulmonary circulation at normal filling pressures, leading to systemic venous congestion with or without low cardiac output.most common cause of right heart failure is left ventricular failure.

In ICU practice, acute RV failure is a hemodynamic emergency — commonly seen in:

• Massive pulmonary embolism
• Acute RV infarction
• Severe pulmonary hypertension
• ARDS with high PEEP
• Post–cardiac surgery
• Sepsis-induced myocardial dysfunction

Understanding RV physiology is essential because the RV behaves very differently from the LV.

Right Ventricular Physiology

RV Pressure-Volume Loop

• Normal RV systolic pressure: 15–30 mmHg
• RV cannot tolerate acute rise in afterload
• Sudden increase in PVR → RV dilates → septal shift → LV collapse((D-shaped LV)

Pathophysiology of RV Failure

Types of RV Failure

1. Acute RV Failure

Sudden rise in afterload.ICU emergency.

Examples:

• Massive PE
• Acute RV infarction
• Acute severe ARDS

2. Chronic RV Failure (Cor Pulmonale)
➡️ Right ventricular (RV) hypertrophy ± dilatation and/or failure
➡️ Secondary to pulmonary hypertension caused by lung diseaseChronic obstructive pulmonary diseaseInterstitial lung disease

For  Diagnosis 

Diagnosis requires ALL 3 components:

 A. Evidence of Pulmonary Disease

 B. Evidence of Pulmonary Hypertension (PH)

Hemodynamic definition (Gold standard):

• Mean Pulmonary Artery Pressure (mPAP) ≥ 20 mmHg at rest
  (via Right Heart Catheterization)

 C. Evidence of Right Heart Involvement

• RV hypertrophy / dilatation
• Right heart failure signs

3. Acute on Chronic RV Failure

• COPD patient with chronic pulmonary hypertension develops acute PE.

Clinical Features

Symptoms

• Dyspnea
• Fatigue
• Abdominal fullness
• Peripheral edema/Anasarca
• Weight Gain
• The systemic perfusion pressure (MAP – CVP). Therefore raised CVP can develop  Congestive encephalopathy (delirium with agitation, confusion, or drowsiness).Congestive nephropathy with reduced urine output.
• Bowel wall edema can cause bacterial translocation then sepsis

Signs 

• Elevated JVP
• Prominent v waves (TR)
• Hepatomegaly-right upper quadrant tenderness
• Hepatojugular reflux
• S3 gallop
• Right ventricular heave
• Paradoxical pulse
• Ascites
• Hypotension (late)

In acute RV failure:

• Shock with clear lungs

Chest X-ray:

• Enlarged right descending pulmonary artery (>16 mm)
• Cardiomegaly (RV enlargement)
• Pruning of peripheral vessels

MRI is now the gold standard for measuring right ventricle volumes and function.

Pocus:IVC dilation,RV dilation,VExUS (Severe tricuspid regurgitation causes flow reversal in the hepatic vein Doppler sonography) 

Note-Venous congestion not always Needs diuresis [its mind boggling for me too 🙂 ]Patients with chronic pulmonary hypertension may always have a high VExUS score, so this doesn’t necessarily indicate aggressive diuresis

ECG 

Labs

• RFT
• LFT(Congestive hepatopathy-Hyperbilirubinemia,mostly unconjugated,High ALP,SGPT/SGOT mildly elevated)
• ABG
• Lactate
• Hypoalbuminemia
• BNP (brain natriuretic peptide) is generally elevated

Differentiating RVF from LV Failure

Hemodynamics 

• CVP is useful in RV failure because it directly reflects right atrial/right-sided filling pressure. It is poor for estimating left-sided filling pressures, but that is not the goal in isolated RV failure.
• Target CVP: ~8–12 mmHg (moderately elevated) is a reasonable starting target, not a rigid goal. Interpret alongside clinical examination, echocardiography, perfusion, urine output, lactate, and organ function.
• Main role of CVP: Guide decongestion (diuresis/ultrafiltration) rather than fluid administration.
• CVP >12 mmHg with signs of systemic venous congestion supports that further diuresis is often appropriate and generally safe, provided blood pressure and end-organ perfusion are maintained.
• Do not give fluids based on a low CVP alone—assess fluid responsiveness (e.g., echocardiography, dynamic indices) and the overall hemodynamic picture.

Pulmonary artery catheter:

• Elevated RAP
• Normal wedge pressure (if isolated RVF)

Echocardiographic 

• RV dilatation (RV/LV end-diastolic area ratio > 1.0)
• RV basal diameter > 41 mm (apical 4-chamber view)
• D-shaped LV (septal flattening)

D-configuration in diastole suggests volume overload.

D-configuration in systole suggests pressure overload (i.e., pulmonary hypertension).

• RV hypertrophy(>5 mm wall thickness,measured at end-diastole)suggests chronic pulmonary hypertension.
• A normal right ventricle should not be more than 2/3 the size of the left ventricle. 
• Pericardial effusion is an indicator of severe, chronic pulmonary arterial hypertension

Acute RV Failure Specific Signs

• McConnell sign—Akinesis or severe hypokinesis of the mid free wall of the RV,Preserved or hyperdynamic contraction of the RV apex (“apical sparing”)-(acute PE)
• Severe TR
• Dilated IVC with poor collapse

Seen in:

• Pulmonary embolism

Management of Acute Right Ventricular Failure

RV is preload dependent but afterload sensitive

Management = Balance preload + reduce afterload + improve contractility

Optimize Preload

• Avoid fluid overload
• Small fluid bolus (250 ml) if hypovolemic,acute RVMI is generally initially fluid-responsive
• Stop aggressive fluids

Over-resuscitation worsens septal shift.

Reduce Afterload

A. Oxygenation

• Oxygen is pulmonary vasodilator.
• Avoid hypoxia
• Avoid hypercapnia(CO2 is a pulmonary vasoconstrictor)

B. Ventilator management

• Physiological difficult airway—avoid intubation 
• Use lowest PEEP compatible with oxygenation

C. Pulmonary Vasodilators(in PAH cases)

• Inhaled nitric oxide-requires gradual withdrawal to prevent hemodynamic decompensation from rebound pulmonary hypertension.
• I.V epoprostenol(1 to 2 ng/kg/min, uptitrated as tolerated)

Improve Contractility

Avoid pure alpha agents (increase PVR).

Maintain Coronary Perfusion

• RV perfusion occurs in systole + diastole.High SBP Helps RV perfusion during systole so SBP >> RVSP
• Optimal MAP is Unknown .
• Maintain MAP > (60 mm + CVP)—need a higher MAP target to achieve adequate systemic perfusion
• Vasopressin—Increases SVR while reducing PVR
• Norepinephrine—alpha-agonist so it can increase pulmonary vascular resistance 

Specific Treatment

• PE → Thrombolysis
• RV MI → Revascularization
• ARDS → Lung protective ventilation

Mechanical Support

In refractory RV failure:

• VA-ECMO
• RV assist device

Used in:

• Massive PE
• Post-cardiotomy RV failure

Cor Pulmonale Management

DIURETICS – For Volume Overload

When to start?

• Peripheral edema
• Raised JVP
• Congestive hepatomegaly

Drugs & Doses:

• Furosemide
• Start: 20–40 mg PO/IV
• Titrate up (can go 80–160 mg/day)
• Add:
• Spironolactone 25–50 mg/day (if resistant)

Caution:

• Overdiuresis → ↓ RV preload → ↓ cardiac output
• Electrolyte imbalance → arrhythmias

 Use cautiously — RV is preload dependent

BRONCHODILATORS (if COPD-related)

a) Beta-agonists

• Salbutamol
• Neb: 2.5–5 mg every 4–6 hr
• MDI: 100–200 mcg PRN

b) Anticholinergics

• Ipratropium
• Neb: 0.5 mg every 6–8 hr

c) LABA + LAMA (maintenance)

• Tiotropium, Formoterol combinations

 Improve ventilation → ↓ hypoxia → ↓ pulmonary vasoconstriction

 PULMONARY VASODILATORS 

Options:

• Sildenafil (PDE-5 inhibitor)
• Dose: 20 mg TDS
• Bosentan (Endothelin antagonist)
• Prostacyclin analogs (Iloprost)
• Intravenous pulmonary vasodilators (e.g., epoprostenol) should always be continued for patients who were previously on them

Inhaled pulmonary vasodilators 

Options :inhaled epoprostenol, nitric oxide, milrinone

contraindication:severe left ventricular failure or pulmonary veno-occlusive disease

Mainly used in:Pulmonary Arterial Hypertension (Group 1 PH)

Not routinely used in cor pulmonale due to COPD

Why?

• Can worsen V/Q mismatch
• Cause hypoxemia

When to consider?

ONLY if:

• Severe pulmonary hypertension disproportionate to lung disease
• Specialist-guided therapy

NTG–0.5-3 ug/kg/min,Use it with +/- dobutamine, +/- vasopressin

LONG-TERM OXYGEN THERAPY (LTOT) 

Indication (GOLD / ESC / BTS):

• PaO₂ ≤ 55 mmHg OR SaO₂ ≤ 88%
• PaO₂ 56–59 + polycythemia / cor pulmonale / pulmonary HTN

Prescription:

• Flow: 1–3 L/min via nasal prongs
• Target SpO₂: 88–92% (avoid hyperoxia)
• Duration: ≥15 hours/day (ideally 18–24 h)

Why critical?

• Reverses hypoxic pulmonary vasoconstriction
• ↓ pulmonary artery pressure
• Improves survival (ONLY intervention proven to do so in COPD cor pulmonale)

REFERENCES

1. Hussain K, Mandras SA, Desai S. Right Heart Failure. [Updated 2024 Dec 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK459381/