ChronicChronic= any progressive illness that lasts for a long time thromboembolicThromboembolic= a condition where a blood clot (thrombus) has travelled from its origin to other parts of the body. pulmonaryPulmonary= relating to the lungs. hypertensionHypertension= high blood pressure (CTEPH) is just one type of pulmonary hypertension (PH).1

Pulmonary hypertension (PH) is a condition where hypertensionHypertension= high blood pressure occurs in those arteriesArteries= blood vessels or tubes carrying blood from the heart that carry blood to the lungs – the pulmonary arteries. The rise in blood pressure is caused by changes within the pulmonary arteries that restrict the blood flow. These changes occur as a result of various medical conditions or without any known cause.1,2 The medical definition of PH is blood pressure in the pulmonary arteries (mean pressure) of 25 mmHg or above1 (the normal value is below 20 mmHg).2

Five types of PH have been defined1 and they all share some common characteristics. However, there are certain differences that occur with CTEPH.

  1. Galiè N et al. Eur Heart J 2015:doi:10.1093/eurheart/ehv317.
  2. Cleveland Clinic 2015. Pulmonary hypertension: causes, symptoms, diagnosis, treatment. Available at: http://my.clevelandclinic.org/health/diseases_conditions/hic_Pulmonary_Hypertension_Causes_Symptoms_Diagnosis_Treatment
Chronic thromboembolic pulmonary hypertension (CTEPH) definition

PH high pressure in pulmonary arteries