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Portopulmonary Hypertension

11

and Hepatopulmonary Syndrome

Arun Jose, Shimul A. Shah, Chandrashekar J. Gandhi,

Francis X. McCormack, and Jean M. Elwing

Introduction

Portopulmonary hypertension (PoPH) and hepatopulmonary syndrome (HPS) are two distinct, but related, pulmonary vascular diseases that occur exclusively in patients with underlying chronic liver disease (Tables 11.1 and 11.2). Although the mechanisms that drive disease pathogenesis are unclear, developments of PoPH and HPS both likely involve vasoactive mediators that are produced by or bypass metabolism by the diseased liver and result in inappropriate angiogenesis, in ammation, and remodeling in the pulmo-

nary vasculature. Symptoms are nonspecifc and diffcult to separate from underlying chronic liver disease, but early identifcation of PoPH and HPS is of paramount importance as these conditions have signifcant prognostic implications and can substantially affect candidacy for and outcomes of liver transplantation (LT). LT is curative in some cases of PoPH, and for most cases of HPS, but the mechanistic basis of beneft remains to be determined. A high index of suspicion for PoPH and HPS is recommended when evaluating chronic liver disease patients with pulmonary symptoms (Fig. 11.1).

 

 

C. J. Gandhi

 

 

A. Jose (*)

Pulmonary Hypertension, Cincinnati VA Medical Center,

Division of Pulmonary, Critical Care, and Sleep Medicine,

Cincinnati, OH, USA

Department of Internal Medicine, University of Cincinnati,

Divisions of Gastroenterology, Hepatology and Nutrition,

Cincinnati, OH, USA

Department of Pediatrics, Cincinnati Children’s Hospital Medical

 

 

Pulmonary Hypertension, Cincinnati VA Medical Center,

Center, Cincinnati, OH, USA

Cincinnati, OH, USA

e-mail: shekar.gandhi@cchmc.org

e-mail: josean@ucmail.uc.edu

F. X. McCormack · J. M. Elwing

 

 

S. A. Shah

Division of Pulmonary, Critical Care, and Sleep Medicine,

Division of Transplantation, Department of Surgery, University of

Department of Internal Medicine, University of Cincinnati,

Cincinnati, Cincinnati, OH, USA

Cincinnati, OH, USA

e-mail: shimul.shah@uc.edu

e-mail: Frank.mccormack@uc.edu; Jean.Elwing@uc.edu

© Springer Nature Switzerland AG 2023

177

V. Cottin et al. (eds.), Orphan Lung Diseases, https://doi.org/10.1007/978-3-031-12950-6_11

 

Данная книга находится в списке для перевода на русский язык сайта https://meduniver.com/

178 A. Jose et al.

Table 11.1  Comparison of the clinical presentation, epidemiology, molecular pathogenesis, diagnosis, and therapeutics of HPS and PoPH

 

HPS

PoPH

Clinical features

Dyspnea, orthodeoxia, platypnea

Dyspnea, fatigue, weakness, syncope, orthopnea

Physical exam fndings

Digital clubbing, cyanosis

Peripheral edema, ascites, pulsatile liver, tricuspid regurgitant murmur,

 

 

split second heart sound, elevated jugular venous pulsation

 

 

 

Age at diagnosis

40–50

60

Prevalence in patients with

1–4%

1–6%

liver disease

 

 

Prevalence in patients

10–47%

5–8.5%

undergoing liver transplant

 

 

evaluation

 

 

Molecular pathogenesis

ET-1, pulmonary nitric oxide, low

ET-1, thromboxane B-1, low BMP-9, elevated endoglin, nitric oxide,

 

BMP-9, low BMP-10, intestinal

IL-6, serotonin, prostaglandins, activated hepatic stellate cells

 

bacterial translocation into

 

 

systemic circulation, genetic

 

 

polymorphisms of endoglin,

 

 

COL18A1, NOX4, RUNX1

 

Portal hypertension

Usually Present

Always Present

High-resolution computed

Nonspecifc

Enlarged central PA, enlarged RV, interlobular septal thickening and

tomography fndings

 

reticulations

 

 

 

Echocardiographic testing

Late bubbles in LA

Dilated or thickened RV, tricuspid regurgitation, pericardial effusion

fndings

 

 

Characteristic laboratory

Low PaO2 and elevated A-a

Elevated BNP levels on serum testing

testing fndings

gradient on arterial blood gas

 

Impact of liver transplantation

Curative

Variable

 

 

 

Additional treatment

Supplemental Oxygen

Pulmonary vasodilator therapy

modalities

 

 

Effect of pulmonary

Can increase shunting

Reduced PA pressures and RV stress, improved cardiac function and

vasodilator therapy

 

PVR, improvement in symptoms, and walk distance

 

 

 

ET-1 endothelin-1, BMP-9 bone morphogenic protein 9, BMP-10 bone morphogenic protein 10, IL-6 interleukin-6, PA pulmonary artery, RV right ventricle, LA left atrium, PVR pulmonary vascular resistance, A-a alveolar-arterial gradient, PaO2 partial pressure of oxygen, BNP brain natriuretic peptide

Table 11.2  Classifcation criteria and defnition of PoPH and HPS, as per the 2015 ERS/ESC Guidelines [1], revised at the 6th World Symposium on Pulmonary Hypertension [2], and the most recent American Association for the Study of Liver Diseases Guidelines [3], and International Liver Transplant Society Guidelines [4]

Portopulmonary hypertension (PoPH)

1.  Portal Hypertension

(a)  Hepatic venous pressure gradient ≥6 mmHg OR

(b)  Presence of clinical sequelae of portal hypertension (splenomegaly, thrombocytopenia, portosystemic shunts, esophageal varices, or portal vein abnormalities) in a patient with an underlying risk factor for portal hypertension (such as chronic liver cirrhosis)

2.  Precapillary Pulmonary Hypertension on Right Heart Catheterization at rest

(a)  Mean pulmonary arterial pressure >20 mmHg

(b)  Pulmonary capillary wedge pressure ≤15 mmHg

(c)Pulmonary vascular resistance ≥3 Woods units (240 dynes/s/cm−5)

Hepatopulmonary syndrome (HPS)

1.  Chronic liver disease (such as portal hypertension or chronic liver cirrhosis)

2.  Arterial deoxygenation present on resting arterial blood gas analysis while breathing ambient air

(a)Alveolar-arterial oxygen gradient ≥15 mmHg (≥20 mmHg in those over age 65)

OR

(b)PaO2 of <80 mmHg (<70 mmHg in those over age 65)

3.  Intrapulmonary vascular dilation

  (a)  Late bubbles (after 3 cardiac cycles) appearing in the left atrium on contrast-enhanced TTE imaging