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There are many types of conduction disorders that can occur anywhere along the cardiac conduction system: at the sinoatrial (SA) node, the atrioventricular (AV) node, or the bundle branches. The problem can be with signal generation, how the signal travels through the heart, or both. Disorders can occur on a much smaller level within ion channels in a heart muscle cell that work together to make the heart cell contract.

The most common cause of high blood cholesterol is an unhealthy lifestyle. However, the genes that you inherit from your parents, other medical conditions, and some medicines may also cause high blood cholesterol.

Common sleep apnea signs and symptoms are snoring or gasping during sleep; reduced or absent breathing, called apnea events; and sleepiness. Undiagnosed or untreated sleep apnea prevents restful sleep and can cause complications that may affect many parts of your body.

Cystic fibrosis is an inherited disease caused by mutations in a gene called the cystic fibrosis transmembrane conductance regulator (CFTR) gene.

Changes to the heart’s tissue and to its electrical signals most often cause atrial fibrillation. When the heart’s tissue or signaling is damaged, the regular pumping of the heart muscle becomes fast and irregular.

BPD is a type of neonatal respiratory disease that develops as a result of a newborn's lungs not developing normally while the baby is growing in the womb or not developing fully if the baby was born premature. These babies’ lungs are fragile and can be easily irritated or inflamed after birth. Ventilation, high levels of oxygen, or infections can also damage premature newborns' lungs.

Signs and symptoms of pulmonary hypertension are sometimes hard to recognize, because they are similar to those of other medical conditions. People may have symptoms for years before being diagnosed with pulmonary hypertension. These symptoms may get worse over time and could eventually lead to serious complications such as right heart failure.

Difficulty breathing is usually the first symptom of ARDS. Other signs and symptoms of ARDS may vary depending on the underlying cause and how severely you are affected. ARDS may take several days to develop, or it can rapidly get worse. Complications may include blood clots, infections, additional lung problems, or organ failure.

You may have an increased risk of ARDS because of infection, environmental exposures, lifestyle habits, genetics, other medical conditions or procedures, race, or sex. Risk factors can vary depending on your age, overall health, where you live, and the healthcare setting in which you receive care.

Circadian rhythm disorders occur when your sleep-wake cycle is out of sync with your environment. Many factors, both internal and external, can cause you to have problems sleeping and raise your risk for a circadian rhythm disorder.