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Pulmonary Hypertension: Classification and Pathogenesis01:30

Pulmonary Hypertension: Classification and Pathogenesis

Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
There are various classifications for PH, each relating to different underlying causes and also...
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Portal Hypertension01:22

Portal Hypertension

Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...

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Increasing Pulmonary Artery Pulsatile Flow Improves Hypoxic Pulmonary Hypertension in Piglets
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Hepatopulmonary syndrome: an update.

Liana Gonçalves de Macêdo1, Edmundo Pessoa de Almeida Lopes

  • 1Otávio de Freitas Hospital, Recife, Pernambuco, Brazil. liana.macedo@ig.com.br

Sao Paulo Medical Journal = Revista Paulista De Medicina
|December 17, 2009
PubMed
Summary

Hepatopulmonary syndrome (HPS), a complication of liver disease, involves lung vascular changes and gas abnormalities. Early diagnosis is crucial for prioritizing liver transplant candidates with HPS for better outcomes.

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Area of Science:

  • Hepatology
  • Pulmonology
  • Transplantation Medicine

Background:

  • Hepatopulmonary syndrome (HPS) is characterized by liver disease, intrapulmonary vascular dilatations (IPVD), and arterial gas abnormalities.
  • HPS affects up to 32% of liver transplant candidates and can occur in non-cirrhotic patients with portal hypertension.
  • Pathogenesis involves factors like endothelin receptor imbalance, pulmonary microvascular remodeling, and genetic predisposition leading to IPVD.

Purpose of the Study:

  • To review pathogenetic theories of HPS.
  • To examine current diagnostic criteria for HPS.
  • To critically analyze the prioritization of HPS patients on liver transplant waiting lists.

Main Methods:

  • Literature search of Medline (PubMed), Cochrane Library, and Lilacs databases (January 2002 - December 2007).
  • Inclusion of adult studies in English or Portuguese using the term "hepatopulmonary syndrome".
  • Review of relevant articles, textbooks, and cited references.

Main Results:

  • Diagnosis relies on imaging (contrast echocardiography, 99mTc perfusion scintigraphy) and arterial blood gas analysis (elevated O2 alveolar-arterial difference, hypoxemia).
  • No effective pharmacological treatment exists; liver transplantation is the only curative option.
  • HPS presence is linked to worse prognosis, underscoring its importance in transplant candidate selection.

Conclusions:

  • HPS diagnosis is vital for prioritizing liver transplant candidates due to its impact on prognosis.
  • Further research into pathogenetic mechanisms and effective treatments is warranted.
  • Optimizing transplant waiting list prioritization for HPS patients is essential.