EXHIBIT 10.03

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
("THE ACT"), AND MAY NOT BE SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF
EXCEPT IN ACCORDANCE WITH THE REGISTRATION REQUIREMENTS OF THE ACT OR IN
COMPLIANCE WITH AN EXEMPTION THEREFROM.

                       AMERICAN MEDICAL TECHNOLOGIES, INC.

                             SECURED PROMISSORY NOTE

                               DUE MARCH 31, 1998

MARCH 30, 1997                                                      $ 105,875.00

            FOR VALUE RECEIVED, the undersigned MARK K. LEVENICK, an individual
residing in Denton County, Texas (hereinafter referred to as the "Payor"),
hereby promises to pay to the order AMERICAN MEDICAL TECHNOLOGIES, INC., a
corporation organized under the laws of the State of Delaware (hereinafter
referred to as the "Payee"), the principal amount of ONE HUNDRED FIVE THOUSAND
EIGHT HUNDRED SEVENTY-FIVE DOLLARS ($105,875.00) in lawful money of the United
States of America payable upon demand or, if no demand is made, on or before
March 31, 1998. The unpaid principal amount of this Note shall bear interest
from the date hereof at an annual rate of 10% and be payable quarterly in
arrears commencing June 30, 1997 and at maturity howsoever maturity shall be
brought about.

            Notwithstanding the foregoing, in no event shall interest on the
outstanding principal amount of this Note be payable at a rate in excess of the
maximum rate permitted by applicable law, and, solely to the extent necessary to
result in such interest not being payable at a rate in excess of such maximum
rate, any amount that would be treated a part of such interest under final
judicial interpretation of applicable law shall be deemed to have been a mistake
and automatically cancelled, and, if received by the holder hereof, shall be
refunded to the undersigned, it being the intention of the holder hereof and the
undersigned that such interest not be payable at a rate in excess of such
maximum rate.

            The principal amount of this Note may be prepaid without premium or
penalty, at the option of the Payor, at any time and from time to time in whole
or in part upon not less than seven days' prior written notice specifying the
amount of the repayment and provided that interest on the repayment amount
calculated to the date of such repayment is paid together with the specified
repayment amount.

            All payments by the Payor on account of principal of or interest on
this Note shall be made by check delivered to the Payee at 5847 San Felipe,
Houston, Texas 77057.

            Payment of this Note is secured by a first and prior security
interest in One Hundred Thousand (100,000) shares of the issued and outstanding
common stock of American Medical Technologies, Inc. as evidenced by, and
pursuant to, that certain Stock Pledge Agreement dated as of March 30, 1997 by
and between the Payor as Pledgor and Payee as Pledgee.

            The person in whose name this Note shall be registered shall be
deemed and treated 

as the absolute owner hereof for all purposes, and the Payor shall not be
affected by any notice to the contrary, and payment of or on account of
principal and the interest on this Note shall be made only to or upon the order
in writing of the registered holder hereof or such holder's duly authorized
representative. All such payments shall be valid and effectual to satisfy and
discharge the liability upon this Note to the extent of the sum or sums so paid.

            If default hereunder shall occur and shall not be cured to the
satisfaction of the Payee, then the Payee may, at its option, by notice to the
Payor, declare the entire unpaid principal balance of this Note and all unpaid
accrued interest thereon to be forthwith due and payable and, without more,
proceed to exercise Payee's rights and privileges under the above mentioned
Stock Pledge Agreement.

            Except to the extent that waiver of notice is prohibited by law, the
Payor and any and all co-makers, endorsers, guarantors and sureties jointly and
severally waive notice (including, but not limited to, notice of intent to
accelerate and notice of acceleration), demand, presentment for payment, protest
and the filing of suit for the purpose of fixing liability and consent that the
time of payment hereof may be extended and re-extended from time to time without
notice to them or any of them, and each agree that his, her or its liability on
or with respect to this Note shall not be affected by any release of or change
in any security at any time existing or by any failure to perfect or to maintain
perfection of any lien on or security interest in any such security.

            All notices and other communications hereunder shall be sufficiently
given to the Payor if, in writing, sent by first class certified or registered
mail, return receipt requested, postage prepaid, to Mark K. Levenick, 2716
Gentle Dr., Flower Mound, Texas 75028-5691 and if to Payee, at the address set
forth hereinabove (or at such other address as Payee shall provide in writing to
the Payor). All notices or other communications hereunder shall be deemed given
when received by the respective addressees thereof or their respective
authorized agent.

            IN WITNESS WHEREOF, this Note has been duly executed and delivered
effective as of the date written above.

                              PAYOR

                              /S/ MARK K. LEVENICK
                              MARK K. LEVENICK


WITNESS:

/S/ LEONARD L. CARR, JR.
BY:  LEONARD L. CARR, JR.

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