Exhibit 21.1

Subsidiaries of the Registrant

The Registrant has the following subsidiaries, which except as indicated, do
business under their legal names:



|                                                                                                                                                     |  |                                    
|---------------------------------------------------------------------------------------------------------------------------------------------------- |  | -----------------------------------
|NAME                                                                                                                                                 |  | PLACE OF INCORPORATION/ORGANIZATION
|Ambulatory Infusion Therapy Specialist, Inc.                                                                                                         |  | Texas                              
|Dallas Nevada, Inc.                                                                                                                                  |  | Nevada                             
|DeAn Joint Venture                                                                                                                                   |  | China                              
|Doctors Practice Management, Inc.                                                                                                                    |  | Texas                              
|DPM II, Inc.                                                                                                                                         |  | Texas                              
|Pasadena Nevada, Inc.                                                                                                                                |  | Nevada                             
|Surgery Specialty Hospitals of America, Inc.                                                                                                         |  | Nevada                             
|Vista Community Medical Center, LLP d/b/a Surgery Specialty Hospitals of America  Southeast Houston Campus (formerly Vista Medical
Center Hospital) |  | Texas                              
|Vista Dallas, LLC                                                                                                                                    |  | Texas                              
|Vista Healthcare, Inc.                                                                                                                               |  | Texas                              
|Vista Holdings, LLC                                                                                                                                  |  | Louisiana                          
|Vista Hospital of Baton Rouge, LLC d/b/a Vista Surgical Hospital of Baton Rouge                                                                      |  | Louisiana                          
|Vista Hospital of Dallas, LLP d/b/a Vista Hospital of Dallas                                                                                         |  | Texas                              
|Vista Land and Equipment, LLC                                                                                                                        |  | Texas                              
|Vista Medical Management, LLC                                                                                                                        |  | Louisiana