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Idiopathic pulmonary arterial hypertension

Last reviewed: 5 Apr 2025
Last updated: 24 Oct 2024

Summary

Definition

History and exam

Key diagnostic factors

  • age 20-50 years
  • female sex
  • dyspnea
  • accentuated pulmonic component (P2) to the second heart sound
  • tricuspid regurgitation murmur
  • family history
Full details

Other diagnostic factors

  • fatigue
  • peripheral edema
  • cyanosis
  • stimulant use
  • syncope
  • chest pain
  • near syncope
  • early diastolic, high-pitched murmur in the pulmonary area
  • jugular vein distension
Full details

Risk factors

  • family history
  • female sex
  • bone morphogenetic protein receptor type 2 (BMPR2) mutations
  • appetite suppressants
  • drugs and toxins
Full details

Diagnostic tests

1st tests to order

  • chest radiography
  • ECG
  • transthoracic Doppler echocardiography
  • right heart catheterization
  • antinuclear antibodies (ANA)
  • pulmonary function tests
  • arterial blood gas (ABG)
  • nocturnal oximetry
  • ventilation-perfusion (V/Q) scintigraphy
  • 6-minute walk test
  • B-type natriuretic peptide (BNP) or N-terminal proBNP (NT-proBNP)
  • CBC
  • LFTs
  • thyroid function tests
  • HIV serology
Full details

Tests to consider

  • high-resolution chest CT scan ± CT pulmonary angiography
  • cardiac MRI
  • vasodilator testing with inhaled nitric oxide, inhaled iloprost, or intravenous epoprostenol
Full details

Treatment algorithm

ONGOING

positive response to acute vasoreactivity testing with no contraindication to calcium-channel blockers

negative response to acute vasoreactivity testing or contraindication to calcium-channel blockers: without cardiopulmonary comorbidity

Contributors

Authors

Muhammad Sameed, MD

Director Advance Lung Disease Program

Department of Pulmonary & Critical Care Medicine

Assistant Professor of Medicine

Thomas Jefferson University Hospital - Einstein Health

Philadelphia

PA

Disclosures

MS declares that he has no competing interests.

Gustavo A. Heresi, MD, MS
Gustavo A. Heresi

Director, Pulmonary Vascular and CTEPH Program

Department of Pulmonary and Critical Care Medicine

Respiratory Institute

Cleveland Clinic

Cleveland

OH

Disclosures

GAH has received speaking and advisory board fees from Bayer Healthcare, the manufacturer of riociguat.

Acknowledgements

Dr Muhammad Sameed and Dr Gustavo A. Heresi would like to gratefully acknowledge Dr Raed A. Dweik, a previous contributor to this topic.

Disclosures

RAD declares that he has no competing interests.

Peer reviewers

Michael J. Krowka, MD

Division of Pulmonary and Critical Care Medicine

Mayo Clinic College of Medicine

Rochester

MN

Disclosures

MJK declares that he has no competing interests.

Charlie Elliot, MB ChB, MRCP

Consultant Physician in Respiratory and General Internal Medicine

Sheffield Pulmonary Vascular Disease Unit

Royal Hallamshire Hospital

Sheffield

UK

Disclosures

CE has received reimbursement for attending several conferences as well as lecture fees from Actelion Pharmaceuticals, GSK, and Bayer.

Maria Giovanna Triveri, MD, PhD

​Assistant Professor of Cardiology,

Medical Director of the Pulmonary Hypertension Program

Icahn School of Medicine at Mount Sinai Hospital

New York

NY

Disclosures

MGT has participated on Advisory Boards of Bayer and Actelion and received financial compensation for attendance.

References

Our in-house evidence and editorial teams collaborate with international expert contributors and peer reviewers to ensure that we provide access to the most clinically relevant information possible.

Key articles

Simonneau G, Montani D, Celermajer DS, et al. Haemodynamic definitions and updated clinical classification of pulmonary hypertension. Eur Respir J. 2019 Jan;53(1):1801913.Full text  Abstract

Humbert M, Kovacs G, Hoeper MM, et al; ESC/ERS Scientific Document Group. 2022 ESC/ERS guidelines for the diagnosis and treatment of pulmonary hypertension. Eur Heart J. 2022 Oct 11;43(38):3618-731. [Erratum in: Eur Heart J. 2023 Feb 23:ehad005.]Full text  Abstract

Rich S, Dantzker DR, Ayres SM, et al. Primary pulmonary hypertension. A national prospective study. Ann Intern Med. 1987 Aug;107(2):216-23. Abstract

Klinger JR, Elliott CG, Levine DJ, et al. Therapy for pulmonary arterial hypertension in adults: update of the CHEST guideline and expert panel report. Chest. 2019 Mar;155(3):565-86. [Erratum in: Chest. 2021 Jan;159(1):457.] Abstract

Frost A, Badesch D, Gibbs JSR, et al. Diagnosis of pulmonary hypertension. Eur Respir J. 2019 Jan;53(1):1801904.Full text  Abstract

Galiè N, Channick RN, Frantz RP, et al. Risk stratification and medical therapy of pulmonary arterial hypertension. Eur Respir J. 2019 Jan;53(1):1801889.Full text  Abstract

Reference articles

A full list of sources referenced in this topic is available to users with access to all of BMJ Best Practice.
  • Idiopathic pulmonary arterial hypertension images
  • Differentials

    • Pulmonary arterial hypertension (PAH) associated with left-sided heart disease (pulmonary venous hypertension)
    • PAH associated with respiratory diseases and/or hypoxia
    • PAH due to chronic thrombotic and/or embolic disease
    More Differentials
  • Guidelines

    • Pulmonary rehabilitation for adults with chronic respiratory disease
    • 2022 ESC/ERS guidelines for the diagnosis and treatment of pulmonary hypertension
    More Guidelines
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