Right Ventricular Failure 

1. 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.


2. Right Ventricular Physiology

Structural Features

Feature

Right Ventricle

Left Ventricle

Shape

Crescent

Circular

Wall thickness

3–5 mm(Thin-walled-Designed for volume handling, not pressure

8–15 mm

Pressure system

Low pressure

High pressure

Afterload sensitivity

VERY HIGH(Highly compliant)

Moderate

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)

3. Pathophysiology of RV Failure

A. Afterload Increase (Most Dangerous)

Causes:

  • Pulmonary embolism
  • Pulmonary hypertension
  • ARDS
  • Hypercapnia
  • Hypoxia
  • High PEEP

B. RV Contractility Reduction

  • Right ventricular myocardial infarction
  • Sepsis-induced cardiomyopathy
  • Myocarditis
  • Post-cardiac surgery

C. Preload Excess

  • Tricuspid regurgitation
  • Aggressive fluid resuscitation
  • Chronic pulmonary hypertension

4. Types of RV Failure

1. Acute RV Failure

Sudden rise in afterload.

Examples:

  • Massive PE
  • Acute RV infarction
  • Acute severe ARDS

2. Chronic RV Failure (Cor Pulmonale)

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

Example:

  • COPD patient with chronic pulmonary hypertension develops acute PE.

These patients:

  • Decompensate rapidly
  • Require ICU care
  • Have poor prognosis

Feature

Acute RVF

Chronic RVF

Onset

Sudden

Gradual

RV wall

Thin

Hypertrophied

BP

Often low

Usually preserved

Shock

Common

Rare (until late)

Main cause

PE, RV MI

PH, COPD

Echo

Dilated RV, septal shift

RVH + dilation

Treatment urgency

Emergency

Long-term management

5. Clinical Features

Symptoms

  • Dyspnea
  • Fatigue
  • Abdominal fullness
  • Peripheral edema/Anasarca

Signs 

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

In acute RV failure:

  • Shock with clear lungs

  ECG 

  • P pulmonale (RA enlargement)-lead II or V1
  • Right axis deviation (> +90°)
  • R/S ratio  of 1 or less in lead V5 or V6, with an S wave amplitude of 7 mm or more in V5 or V6Dominant R in V1
  • Incomplete/complete RBBB

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.


Labs

  • RFT
  • LFT
  • ABG
  • Lactate

Differentiating RVF from LV Failure

Feature

RVF

LV Failure

JVP

High

Normal/slightly high

Lung crepitations

Absent

Present

PCWP

Normal

High

Edema

Prominent

Late

Shock lungs

Clear

Pulmonary edema


6. Hemodynamics 

Parameter

Finding

CVP

High

PCWP

Normal or low

MAP

Low

PVR

High

CO

Reduced

Pulmonary artery catheter:

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

7. Echocardiographic Diagnostic Criteria 

Structural Criteria

  • RV dilatation (RV/LV end-diastolic area ratio > 1.0)
  • RV basal diameter > 41 mm (apical 4-chamber view)
  • D-shaped LV (septal flattening)
  • RV hypertrophy(>5 mm wall thickness)
  • A normal right ventricle should not be more than 2/3 the size of the left ventricle. 

Functional Criteria

Parameter

Diagnostic Cutoff

TAPSE

< 17 mm

RV fractional area change (FAC)

< 35%

S’ velocity (TDI)

< 9.5 cm/s

RV free wall strain

> −20% (less negative)

Myocardial performance index (MPI): 

MPI increases as the isovolumic times increase and contraction times decrease.

Eccentricity index

allows for the quantitative assessment of septal flattening and distinguishes between pressure and volume overload.


Acute RV Failure Specific Signs

  • McConnell sign (acute PE)
  • Severe TR
  • Dilated IVC with poor collapse

Seen in:

  • Pulmonary embolism

8. Diagnostic Criteria in Pulmonary Hypertension–Associated RVF

In chronic RV failure due to:

  • Pulmonary hypertension

Criteria include:

  • Mean pulmonary artery pressure ≥ 20 mmHg (right heart cath)
  • Elevated PVR (>2 Wood units)
  • RV enlargement + dysfunction on echo
  • Elevated RAP

9. Management of Acute Right Ventricular Failure

Core Principle:

RV is preload dependent but afterload sensitive

Management = Balance preload + reduce afterload + improve contractility

Step 1: Optimize Preload

  • Avoid fluid overload
  • Small fluid bolus (250 ml) if hypovolemic
  • Stop aggressive fluids

Over-resuscitation worsens septal shift.

Step 2: Reduce Afterload

A. Oxygenation

  • Avoid hypoxia
  • Avoid hypercapnia

B. Reduce PEEP

  • 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)


Step 3: Improve Contractility

Preferred Inotropes

Drug

Effect

Dobutamine

First line(2–10 µg/kg/min)

Milrinone

Useful in pulmonary hypertension(0.25–0.75 µg/kg/min)

Norepinephrine

If hypotensive(0.05–1 µg/kg/min)

Avoid pure alpha agents (increase PVR).


Step 4: Maintain Coronary Perfusion

RV perfusion occurs in systole + diastole.

Maintain MAP > 65 mmHg.


Step 5: Specific Treatment

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


10. Mechanical Support

In refractory RV failure:

  • VA-ECMO
  • RV assist device

Used in:

  • Massive PE
  • Post-cardiotomy RV failure



Cor Pulmonale Management

 1. CORE PRINCIPLES 

  1. Treat underlying cause (COPD, ILD, OSA, PE)
  2. Correct hypoxia (MOST IMPORTANT intervention)
  3. Optimize RV preload (avoid both overload & underfilling)
  4. Reduce pulmonary vasoconstriction
  5. Manage RV failure if decompensated


 2. LONG-TERM OXYGEN THERAPY (LTOT) – Cornerstone

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)


 3. 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

 Key exam point:
Use cautiously — RV is preload dependent


4. 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

 

5. PULMONARY VASODILATORS 

 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

Options:

  • Sildenafil (PDE-5 inhibitor)
    • Dose: 20 mg TDS
  • Bosentan (Endothelin antagonist)
  • Prostacyclin analogs (Iloprost)

 Mainly used in:

  • Pulmonary Arterial Hypertension (Group 1 PH)


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/