How is pulmonary hypertension measured?

Written by Zeng Wei Jie

Cardiology

Updated on September 11, 2024

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There are usually two methods to measure pulmonary arterial hypertension. One is through echocardiography to estimate, by measuring the speed of tricuspid regurgitation and then calculating the systolic pressure of the pulmonary artery through a formula. This method may overestimate or underestimate, hence its accuracy is not reliable. The gold standard is measuring pulmonary artery pressure via right heart catheterization. The downside of this gold standard is that it is an invasive procedure, which needs to be performed in a catheterization room; compared to ultrasound, it is also more costly. These are the two methods, each with its pros and cons. We need to choose based on the patient's situation.

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Written by Tang Li

Cardiology

1min 48sec

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Pulmonary arterial hypertension standards

Pulmonary hypertension is a common clinical condition with very complex causes, which can be induced by a variety of heart, lung, and pulmonary vascular diseases. When pulmonary hypertension occurs, because the resistance in the pulmonary circulation increases, the burden on the right heart increases, eventually leading to right heart failure, thus causing a series of clinical manifestations. During the disease course, pulmonary hypertension commonly shows progressive development. Currently, the diagnostic criteria for pulmonary hypertension are an average pulmonary artery pressure greater than 25 mmHg measured by right heart catheterization at sea level in a resting state, or greater than 30 mmHg during exercise. Additionally, diagnosing arteriogenic pulmonary hypertension requires, beyond the aforementioned criteria, that the pulmonary capillary wedge pressure or left ventricular end-diastolic pressure be less than 15 mmHg. The severity of pulmonary hypertension can be classified into mild, moderate, and severe stages based on resting mean pulmonary artery pressure levels. Mild is defined as 26 to 35 mmHg, moderate as 36 to 45 mmHg, and severe as greater than 45 mmHg. Echocardiography is the most important non-invasive examination method for assessing pulmonary hypertension, and it is recommended that a pulmonary artery systolic pressure greater than 40 mmHg be considered indicative of pulmonary hypertension according to echocardiographic standards.

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Written by Li Hai Wen

Cardiology

47sec

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The harms of pulmonary arterial hypertension during pregnancy

Pulmonary hypertension is categorized into mild, moderate, and severe stages. If it is mild pulmonary hypertension, pregnancy generally does not have a major impact. However, for those with moderate or especially severe pulmonary hypertension, pregnancy can be very dangerous for both the mother and the fetus. As the fetus grows, pulmonary hypertension can lead to ischemia and hypoxia, which can worsen over time. The mother is likely to develop symptoms of acute heart failure, severely endangering her life. Additionally, it can cause intrauterine hypoxia for the fetus, leading to miscarriage or stillbirth. Therefore, pregnancy is not recommended for patients with moderate, and particularly severe, pulmonary hypertension.

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Written by Li Hai Wen

Cardiology

44sec

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Obvious symptoms of pulmonary hypertension

Pulmonary hypertension is a relatively common disease in everyday life. Based on the causes of pulmonary hypertension, it can be divided into two categories: primary and secondary pulmonary hypertension. Regardless of the type of pulmonary hypertension, patients often exhibit certain symptoms, such as chest tightness and shortness of breath, which are the most common symptoms. In severe cases, some patients may even experience syncope. When pulmonary hypertension affects the heart, causing right ventricular enlargement, patients often show signs of right heart failure, such as shortness of breath, difficulty breathing, lower limb edema, and gastrointestinal symptoms, such as nausea and abdominal distension.

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Written by Zeng Wei Jie

Cardiology

55sec

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Symptoms of pulmonary hypertension

The symptoms of pulmonary arterial hypertension are varied. In the early stages when pulmonary cardiac function is compensatory, the symptoms mainly include cough, phlegm, shortness of breath, difficulty breathing, and fatigue. Later, when pulmonary cardiac function becomes decompensated, symptoms of respiratory failure and right heart failure may occur. In cases of right heart failure, symptoms mainly manifest as systemic circulatory congestion, including visceral nausea, vomiting, palpitations, and pronounced shortness of breath. In respiratory failure, particularly pulmonary hypertension caused by pulmonary heart disease, symptoms like drowsiness, confusion, and gaze fixation, which are typical of pulmonary encephalopathy, may occur. Therefore, the symptoms of pulmonary arterial hypertension are diverse.

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Written by Zeng Wei Jie

Cardiology

46sec

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How is pulmonary hypertension measured?

There are usually two methods to measure pulmonary arterial hypertension. One is through echocardiography to estimate, by measuring the speed of tricuspid regurgitation and then calculating the systolic pressure of the pulmonary artery through a formula. This method may overestimate or underestimate, hence its accuracy is not reliable. The gold standard is measuring pulmonary artery pressure via right heart catheterization. The downside of this gold standard is that it is an invasive procedure, which needs to be performed in a catheterization room; compared to ultrasound, it is also more costly. These are the two methods, each with its pros and cons. We need to choose based on the patient's situation.