Hide This

FREEHER HealthToolkit

HER Health Toolkit

Sign up for EmpowHER updates and you'll receive our
FREE HER Health Toolkit

Sleep Apnea

Get Email Updates

Sleep Apnea Guide

Alison Beaver

Have a question? We're here to help. Ask the Community.

ASK

Health Newsletter

Receive the latest and greatest in women's health and wellness from EmpowHER - for free!

What is Paroxysmal Nocturnal Dyspnea (PND)

By Darlene Oakley HERWriter
 
Rate This

What is PND?

PND or Paroxysmal Nocturnal Dyspnea is commonly referred to as cardiac asthma. It's characterized by sudden and severe shortness of breath at night that can wake a person up can cause coughing and wheezing.

PND is a sign of congestive heart failure and often strikes one or two hours after the person with heart failure has fallen asleep.

Specifically, dyspnea, "refers to the sensation of difficult or uncomfortable breathing,"according to the National Center for Biotechnonoly Information. However, Dyspnea is not the same as hyperventilation which consists of short, quick breaths and an inability to get one's breath. Dyspnea can also be associated with exertion.

PND occurs by a fluid build up in the lungs entering the alveoli (air sacs) while a person sleeps. The alveoli are responsible for oxygen and carbon dioxide exchange from the blood. During the day, the fluid is retained in the legs. At night, while sleeping, the body resorbs this fluid resulting in an increase in total blood volume and blood pressure leading to pulmonary hypertension or edema. Many patients, without realizing the congestive heart failure nature of these symptoms naturally counteract these symptoms by sleeping on several pillows or sleeping while sitting up.

One explanation for the onset of symptoms is that the left ventricle is starting to fail and is unable to keep up with the performance of a perfectly healthy right ventricle. Other theories according NCBI, include "decreased responsiveness of the respiratory center in the brain and decreased adrenergic (adrenalin-fueled) activity in the myocardium (heart muscles) during sleep."

Common Causes of PND

- Chronic Obstructive Pulmonary Disease (COPD): a group of lung conditions including chronic bronchitis and emphysema that affects the lungs' ability to function normally.

-Cor Pulmonale: "An acute strain or hypertrophy [abnormal enlargement] resulting from disease of the lungs or of other blood vessels." (Dictionary.com)

- Heart failure

- Hypertensive heart disease

- Obesity (which aggravates other conditions)

- Panic disorders

- Sleep apnea

Add a CommentComments

There are no comments yet. Be the first one and get the conversation started!

Image CAPTCHA
Enter the characters shown in the image.
By submitting this form, you agree to EmpowHER's terms of service and privacy policy

We value and respect our HERWriters' experiences, but everyone is different. Many of our writers are speaking from personal experience, and what's worked for them may not work for you. Their articles are not a substitute for medical advice, although we hope you can gain knowledge from their insight.

Improved

1628 Health

Changed

606 Lives

Saved

455 Lives
4 lives impacted in the last 24 hrs Learn More

Take Our Featured Health Poll

Do you have sleep apnea?:
View Results