Why does patent ductus arteriosus cause a decrease in diastolic pressure?

Written by Tang Li
Cardiology
Updated on September 05, 2024
00:00
00:00

In patients with patent ductus arteriosus, since the aortic pressure is significantly higher than the pulmonary artery pressure throughout the cardiac cycle, there is continuous blood flow from the aorta into the pulmonary artery through the open duct, causing a left-to-right shunt. This increases the blood volume in the pulmonary circulation, causing dilatation of the pulmonary artery and its branches. The blood flow returning to the left heart system also increases, thereby increasing the load on the left heart and causing the left heart to enlarge. Due to the diastolic diversion of blood from the aorta to the pulmonary artery, the peripheral arterial diastolic pressure decreases and the pulse pressure increases.

Other Voices

doctor image
home-news-image
Written by Xie Zhi Hong
Cardiology
1min 12sec home-news-image

Can you drink alcohol with a patent ductus arteriosus?

Under normal circumstances, the ductus arteriosus in newborns gradually closes, and in most infants, the ductus arteriosus is completely closed within three months. However, for some people, even after one year of birth, the ductus arteriosus may not necessarily be diagnosed as congenital patent ductus arteriosus (PDA), a heart condition. Patients with this condition often experience pathological cardiac phenomena such as left-to-right shunts or right-to-left shunts. Due to these potential issues, the cardiac workload can worsen, leading to cardiac dysfunction and eventually heart failure. Drinking alcohol can potentially increase the patient's blood pressure and heart rate, adding more strain to the heart and exacerbating the condition. Therefore, it is advised that such patients avoid alcohol until after surgical treatment has been completed and their condition has stabilized. There are two methods of surgical treatment: most cases can be completely cured with interventional therapy, while a minority may require surgical ligation.

doctor image
home-news-image
Written by Di Zhi Yong
Cardiology
46sec home-news-image

Which is more serious, patent ductus arteriosus or ventricular septal defect?

Both of these diseases are types of congenital heart disease, and if there are issues with either of them, the situation can be quite severe. There isn't a distinction between which disease is severe and which is not. If the arterial duct remains open or does not close, surgery is still required for this condition. Patients with ventricular septal defect primarily display changes related to ischemia and hypoxia, and they may also experience recurrent respiratory infections, which are quite serious. Surgery is generally the best treatment. Early surgical intervention can achieve a complete cure, but it is also advisable for the patient to have regular echocardiographic check-ups at the hospital.

doctor image
home-news-image
Written by Xie Zhi Hong
Cardiology
39sec home-news-image

Can a patent ductus arteriosus be treated with minimally invasive surgery?

Patent ductus arteriosus refers to the condition in infants where the ductal connection between the pulmonary artery and the aortic arch from the embryonic period remains open after the first year of birth. Generally, this duct is tubular or funnel-shaped and most cases can be treated minimally invasively. Surgical treatment is considered only if there are severe adhesions involving the aorta or pulmonary artery, or there are developmental issues. Therefore, patent ductus arteriosus can be treated with minimally invasive surgery, and most cases are amenable to such treatment.

doctor image
home-news-image
Written by Xie Zhi Hong
Cardiology
56sec home-news-image

Can a patent ductus arteriosus heal by itself?

The ductus arteriosus is a duct that fetal blood must pass through as it is transported from the placenta to the aorta. This duct connects between the main pulmonary artery and the aorta of the fetus and generally closes on its own after birth. Most patients can close it spontaneously within three months, but the likelihood of closure diminishes if it surpasses one year. Therefore, for patent ductus arteriosus, some people can heal on their own, while others, especially children over one year old, cannot heal by themselves and are advised to undergo surgery as soon as possible. This is because the patent ductus arteriosus can cause a condition similar to an arteriovenous fistula, increasing the workload on the heart, leading to cardiac hypertrophy and eventual heart failure.

doctor image
home-news-image
Written by Di Zhi Yong
Cardiology
43sec home-news-image

The reasons for ventricular enlargement due to patent ductus arteriosus

Patent ductus arteriosus can lead to enlargement of the anterior heart, as it can cause enlargement of the left atrium, left ventricle, or anterior ventricle, potentially leading to heart failure, especially altering heart function. If a patient has a patent ductus arteriosus, I personally recommend getting an ECG at a hospital early and then determining a treatment plan. Currently, surgical treatment is advised to improve the condition of reduced heart function. During this time, it is still important to actively and regularly monitor changes in the patient’s blood pressure, heart rate, and pulse. If the heart rate is too fast or blood pressure is elevated, regular hospital visits are necessary for management.