#	Query	Results
S14	(S11 or S12) Limiters - Published Date from: 20040101-20101231; English Language	416
S13	(S11 or S12)	794
S12	s6 and s10	585
S11	(MH “Ventilator Weaning”) Limiters - Age Groups: Aged: 65+ years	235
S10	S7 or S8 or S9	12790
S9	NIV or NPPV or NIPPV or NIAV or continous positive airway pressure or CPAP or bi-level positive pressure or ventilation support or BiPAP or endotracheal intubation or ventilat* failure	1689
S8	artificial N2 ventil* or non-invasive N2 ventil* or noninvasive N2 ventil* or invasive N2 ventil* or nasal N2 ventil* or mechanical N2 ventil* or volume-controlled N2 ventil*or pressure controlled N2 ventil*or positive N2 ventil* or artificial N2 respirat* or non-invasive N2 respirat* or noninvasive N2 respirat* or invasive N2 respirat* or nasal N2 respirat* or mechanical N2 respirat* or volume-controlled N2 respirat*or pressure controlled N2 respirat*or positive N2 respirat*	9597
S7	(MH “rdquo;Respiration, Artificial+”)	10081
S6	S1 or S2 or S3 or S4 or S5	7579
S5	chronic bronchitis or emphysema	1606
S4	(MH “Emphysema+”)	982
S3	copd or coad	4153
S2	(chronic obstructive and (lung* or pulmonary or airway* or airflow or respiratory) and (disease* or disorder*))	5747
S1	(MH “Pulmonary Disease, Chronic Obstructive+”)	4462