Exhibit 3.343

PAGE 1

     I, JEFFREY W. BULLOCK, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED ARE TRUE AND CORRECT COPIES OF ALL DOCUMENTS ON FILE OF “ROCKDALE HOSPITAL, LLC” AS RECEIVED AND FILED IN THIS OFFICE.

     THE FOLLOWING DOCUMENTS HAVE BEEN CERTIFIED:

     CERTIFICATE OF FORMATION, FILED THE NINETEENTH DAY OF AUGUST, A.D. 2008, AT 3:40 O’CLOCK P.M.

     AND I DO HEREBY FURTHER CERTIFY THAT THE AFORESAID CERTIFICATES ARE THE ONLY CERTIFICATES ON RECORD OF THE AFORESAID LIMITED LIABILITY COMPANY, “ROCKDALE HOSPITAL, LLC”.

/s/ Jeffrey W. Bullock

Jeffrey W. Bullock, Secretary of State

4589489      8100H

110292408 AUTHENTICATION: 8619924

DATE: 03-14-11

You may verify this certificate online
at corp.delaware.gov/authver.shtml

State of Delaware
Secretary of State
Division of Corporations
Delivered 03:41 PM 08/19/2008
FILED 03:40 PM 08/19/2008
SRV 080884322 - 4589489 FILE

Certificate of Formation
of
Rockdale Hospital, LLC

     The undersigned, an authorized natural person, for the purpose of forming a limited liability company, under the provisions and subject to the requirements of the State of Delaware, particularly Chapter 18, Title 6 of the Delaware Code and the acts amendatory thereof and supplemental thereto, and known, identified, and referred to as the Delaware Limited Liability Company Act (the “Act”), hereby certifies that:

     FIRST: The name of the limited liability company is Rockdale Hospital, LLC (the “Company”).

     SECOND: The address of the registered office and the name and address of the registered agent of the Company required to be maintained by Section 18-104 of the Act is The Corporation Trust Company, Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801.

     IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation as of August 19, 2008.

By:	/s/ Mary Kim E. Shipp
	Mary Kim E. Shipp Authorized Person