Tract may refer to:

Geography and real estate
Housing tract, an area of land that is subdivided into smaller individual lots
Land lot or tract, a section of land
Census tract, a geographic region defined for the purpose of taking a census

Writings
Tract (literature), a short written work, usually of a political or religious nature
Tract (liturgy), a component of Roman Catholic liturgy
Treatise

Biology
Nerve tract, a bundle of fibers that connects different parts of the central nervous system - analogous to a nerve in the peripheral nervous system
A genetic tract, a sequence of repeating nucleotides or amino acids, such as a polyglutamine tract
A collection of related anatomic structures, such as:
Gastrointestinal tract
Genitourinary tract
Reproductive tract
A grouping of feathers, e.g. primaries, auricular, scapular

Businesses
Tract (imprint), an imprint of the German group VDM Publishing devoted to the reproduction of Wikipedia content

See also

Track (disambiguation)

All pages with titles beginning with Tract
All pages with titles containing Tract
CPAP and BiPAP devices can trigger central Apneas in those with obstructive sleep apnea requiring the use of an ASV (adaptive servo ventilation) device, which is also the proper machine for those who have central sleep apnea or mixed/complex apnea. Epidemiology
Central sleep apnea is less prevalent than obstructive sleep apnea. In one study, CSA is stated to have a prevalence of 0.9% in comparison to OSA.There are many factors that increase the risk of developing CSA. Chronic opioid use produces a mean prevalence in central sleep apnea development of 24%. An estimate of 10% of chronic kidney disease (CKD) patients have a CSA diagnosis. Cohort studies of stroke patients show a 70% development rate of CSA within 72 hours of the stroke event, although CSA was detected in less than 17% after 3 months of follow-up. Another cohort study from the Sleep Heart Healthy study showed incidence of CSA in heart failure patients to be 0.9%. Infancy
Central sleep apnea is common in preterm, newborn, and infancy stages but a decrease in risk is found with aging and maturity of the central nervous system. Underlying neurological disorders are the most common cause of CSA in full term infants. Of the apnea related events in preterm infants born at less than 29 weeks, 25% are central in origin. Childhood
CSA is less common after 2 years of age. The prevalence of CSA in healthy children aging 10 to 18 years is 30%. Children with underlying medical conditions fall under a prevalence rate of 4-6%.