While a small source of data exists on the prevalence of<unk> , a large pool of data exists on the epidemiology of<unk>  in general. Reports show that 7.4% of people reporting to the emergency room identify<unk>  as one of their symptoms, with 1-4% of people identifying<unk>  as their primary concern.<unk>  is often the cause of situational changes in a person's environment or activity. For example, 10% of people complain of<unk>  while walking on flat ground to their primary care provider (PCP), while 25% of people complain of<unk>  upon more intense exertion (i.e. climbing stairs or a hill) to their PCP. Of these people seeing a PCP, 1-4% see their provider for<unk>  specifically. After identifying the cause of<unk> , most people continue on to see a specialist to manage<unk>  presentation and address underlying conditions. Roughly 15-50% of people who are regularly seen by a cardiologist are seen in regard to<unk>  symptoms, while just under 60% of people regularly see a pneumonologist in regard to their<unk> . Additionally, there have been epidemiological studies performed on central sleep apnea in heart failure. Central sleep apnea in heart failure's epidemiology is relevant, as sleep apnea and heart failure have both been associated in people with<unk> . According to the study, researchers were able to conclude that ~70% of people with heart failure had breathing disorders while they slept, while half of that ~70% also experienced central sleep apnea with Cheyne Stokes respiration (CSA-CSR). Atrial fibrillation, the male gender, an age greater than 60, and awake PaCO2 being less than or equal to 38 mm Hg were all risk factors associated with CSA-CSR.
Paroxysmal nocturnal dyspnoea
Exercise intolerance
Expiratory apnea
Platypnea
Trepopnea
Sleep apnea
Periodic breathing
Generalized hypoxia