what is Pulmonary Hypertension?

The heart and circulatory system

To understand what PH is, it first helps to understand a bit about the circulatory system. As shown in the figure, the heart pumps oxygen-poor blood to the lungs so the blood can take up oxygen. Blood that is oxygen-poor is normally shown on diagrams as blue, whereas oxygen-rich blood returning from the lungs is normally shown in red.

The heart and circulatory system

circulatory

During periods of exercise, the heart beats more quickly to get more oxygen to the muscles. At the same time, the blood vessels carrying blood to the lungs (the pulmonary arteries) expand to allow more blood through. The pulmonary arteries do this by stretching slightly. In a person with PH, the walls of the pulmonary arteries are thicker, so are less able to stretch.

The pulmonary artery in a healthy person

healthy_artery

The pulmonary artery in a person with PH

ph_artery

In a person with PH, because the pulmonary arteries are less able to stretch, the heart has to work harder to pump blood to the lungs. If the heart has to work harder than usual over a long period of time (months or years), it begins to work less effectively.

Last medically reviewed: July, 2016 • Due for review: July, 2019

Make a single donation

I wish to give a one-time donation of: £

Gift Aid declaration:

I want the Charity to treat all donations I make from the date of this declaration until I notify you otherwise as Gift Aid donations.

You must pay an amount of income tax and/or capital gains tax at least equal to the tax that the Charity reclaims on your donations in the tax year. (Currently 25p for each pound you give).

Make a regular donation

I wish to donate: £ per month for months.

Gift Aid declaration:

I want the Charity to treat all donations I make from the date of this declaration until I notify you otherwise as Gift Aid donations.

You must pay an amount of income tax and/or capital gains tax at least equal to the tax that the Charity reclaims on your donations in the tax year. (Currently 25p for each pound you give).