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                             
|                                                                                   | 
|DOCTORS PRACTICE MANAGEMENT, INC.                                                  |  | TEXAS                              
|                                                                                   | 
|DPM II, INC.                                                                       |  | TEXAS                              
|                                                                                   | 
|PASADENA NEVADA, INC.                                                              |  | NEVADA                             
|                                                                                   | 
|SURGI+GROUP INC.                                                                   |  | TEXAS                              
|                                                                                   | 
|VISTA COMMUNITY MEDICAL CENTER, L.L.P. d/b/a VISTA MEDICAL CENTER HOSPITAL         |  | TEXAS                              
|                                                                                   | 
|VISTA DALLAS, L.L.C.                                                               |  | TEXAS                              
|                                                                                   | 
|VISTA HEALTHCARE, INC.                                                             |  | TEXAS                              
|                                                                                   | 
|VISTA HOLDINGS, L.L.C.                                                             |  | LOUISIANA                          
|                                                                                   | 
|VISTA HOSPITAL OF BATON ROUGE, L.L.C. d/b/a VISTA SURGICAL HOSPITAL OF BATON ROUGE |  | LOUISIANA                          
|                                                                                   | 
|VISTA HOSPITAL OF DALLAS, L.P. d/b/a VISTA HOSPITAL OF DALLAS                      |  | TEXAS                              
|                                                                                   | 
|VISTA LAND AND EQUIPMENT, L.L.C.                                                   |  | TEXAS                              
|                                                                                   | 
|VISTA MEDICAL MANAGEMENT, L.L.C.                                                   |  | LOUISIANA                          
|                                                                                   | 
|VISTA REDSTONE, INC.                                                               |  | NEVADA                             
|                                                                                   | 
|VISTA SURGICAL CENTER WEST, L.L.C.                                                 |  | TEXAS