Exhibit 21.1

Subsidiaries of the Registrant

The Registrant has the following wholly-owned subsidiaries:

1. CRH Medical Corporation

2. CRH Anesthesia Management LLC

3. Gastroenterology Anesthesia Associates LLC

4. NC GAA, PC

5. CRH GAA PLLC

6. CRH Anesthesia of Gainesville LLC

7. CRH Anesthesia of Florida LLC

8. CRH Anesthesia of Cape Coral LLC

9. CRH Anesthesia of Knoxville LLC

10. CRH Anesthesia of Colorado, LLC

11. Alamo Sedation Associates LLC

12. Shreveport Sedation Associates, LLC

13. CRH Anesthesia of Ohio, LLC

14. CRH GAA of Washington, PLLC

15. Lake Erie Sedation Associates LLC

The Company also holds ownership interests in the following subsidiaries:

1. Macon Gastroenterology Anesthesia Associates LLC

2. Knoxville Gastroenterology Anesthesia Associates LLC

3. Austin Gastroenterology Anesthesia Associates PLLC

4. Greater Boston Anesthesia Associates PLLC

5. Arapahoe Gastroenterology Anesthesia LLC

6. Osceola Gastroenterology Anesthesia Associates LLC

7. DDAB LLC

8. West Florida Anesthesia Associates LLC

9. Central Colorado Anesthesia Associates LLC

10. Raleigh Sedation Associates LLC

11. Western Ohio Sedation Associates, LLC

12. Lake Washington Anesthesia Associates, LLC

13. Tennessee Valley Anesthesia Associates, LLC

14. Triad Sedation Associates, LLC