In ancient Roman religion, Janus (his name in Greek is 'Ιανός - Ianós) is the god of beginnings and transitions,
thence also of gates, doors, passages, endings and time. He is usually
depicted as having two faces, since he looks to the future and to the
past. The Romans named the month of January (Ianuarius) in his honor.
An overlap syndrome is a disease in which a patient presents with symptoms of two or more diseases. That is why Janus can be associated with overlap syndrome.
Multiple epidemiological studies demonstrate that in persons with
obstructive airway disease, as many as half or more may have
overlapping of asthma and COPD. The term Asthma
COPD overlap syndrome (ACOS) was recognized and is appearing for the first time
in GOLD 2014,
but without clear definition and therapeutic options.
A COPD-Asthma overlap syndrome
is defined as an airflow obstruction that is not completely reversible,
accompanied by symptoms and signs of increased obstruction
reversibility. For the clinical identification of overlap syndrome
COPD-Asthma Spanish guidelines proposed six diagnostic criteria. The
major criteria include very positive bronchodilator test [increase in
forced expiratory volume in one second (FEV1) ≥15% and ≥400 ml],
eosinophilia in sputum, and personal history of asthma. The minor
criteria include high total IgE, personal history of atopy and positive
bronchodilator test (increase in FEV1 ≥12% and ≥200 ml) on two or more
occasions. The overlap syndrome COPD-Asthma is associated with enhanced
response to inhaled corticosteroids due to the predominance of
eosinophilic bronchial inflammation.The future clinical studies and
multicenter clinical trials should lead to the investigation of disease
mechanisms and simultaneous development of the novel treatment.
New review article on this Hot Respiratory topic just published in Journal of Cardio-Thoracic Medicine and its free for download.
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