Table 1.

Summary of RCTs on conservative medical therapy and LVRS

Author	Year published	Cases (N)	Imaging diagnosis	Cases underwent conservative medical therapy (n)	Cases underwent LVRS(n)
Criner, G.	1999	37	CT scan	18	19
J[16] Geddes, D[12]	2000	48	CT scan	24	24
Pompeo, E. [17]	2000	60	CT scan	30	30
Fishman, A [18]	2003	1218	CT scan	608	610
Goldstein, R. S [19]	2003	55	CT and V/Q scan*	28	27
Mineo[20]	2004	60	CT scan	30	30
Hillerdal, G. [2]	2005	106	CT and V/Q Scan*	53	53
Miller, J. D[21]	2005	93	CT and V/Q Scan*	58	35

*: V/Q scan, also known as lung scan, which evaluates both the Ventilation and Perfusion of the lungs using scintigraphy and medical isotopes. Q is the symbol for perfusion which represents the movement of blood through the arteries that supply the lung.