Document:

Exhibit
4.1

US$1,775,000,000
ADDITIONAL FACILITY N ACCESSION AGREEMENT

To:                              Toronto Dominion
(Texas) LLC as Facility Agent and TD Bank Europe Limited as Security Agent

From:                  The banks and
financial institutions listed in Schedule 1 to this Agreement (the Additional Facility N Lenders)

Date: 11 May 2007

UPC Broadband Holding B.V. (formerly known as UPC Distribution Holding
B.V) - €1,072,000,000 Term Credit Agreement dated 16 January 2004 as amended
from time to time (the Credit Agreement)

1.                                       In this
Agreement:

Commitment
Letter means the commitment letter between BNP Paribas, J.P. Morgan Plc
and Toronto Dominion (Texas) LLC as Bookrunners and Mandated Lead Arrangers,
BNP Paribas, JPMorgan Chase Bank, N.A. and Toronto Dominion (Texas) LLC as
Underwriters and UPC Financing Partnership dated 9 February 2007 as
amended by an amendment letter dated 26 March 2007.

Facility J2
means the US$887,500,000 term loan facility under the Additional
Facility Accession Agreement dated 10 May 2006.

Facility K2
means the US$887,500,000 term loan facility under the Additional
Facility Accession Agreement dated 10 May 2006.

Facility N
means the US$1,775,000,000 term loan facility which forms this
Additional Facility.

Facility N
Advance means the US dollar denominated advance made to UPC Financing by the Additional
Facility N Lenders under Facility N.

Facility N
Commitment means, in relation to an Additional Facility N Lender,
the amount in US dollars set opposite its name under the heading “Facility N
Commitment” in Schedule 1 to the counterpart of this Agreement executed by that
Additional Facility N Lender, to the extent not cancelled, transferred, or reduced
under the Credit Agreement.

Majority
Facility N Lenders means Additional Facility N Lenders the aggregate of
whose Facility N Commitments exceeds 662/3 per cent. of the Facility N Commitments of all
Additional Facility N Lenders.

2.                                       Unless otherwise defined
in this Agreement, terms defined in the Credit Agreement shall have the same
meaning in this Agreement and a reference to a Clause is a reference to a Clause
of the Credit Agreement.

3.                                       We refer to
Clause 2.2 (Additional Facilities) of the Credit Agreement.

 1
 

4.                                       This Agreement
will take effect on the later of 16 May 2007 and the date on which the Facility
Agent has notified UPC Broadband and the Additional Facility N Lenders that it
has received the documents and evidence set out in Schedule 2 to this
Agreement, in each case in form and substance satisfactory to it or, as the
case may be, the requirement to provide any of such documents or evidence has
been waived by the Majority Facility N Lenders (the Effective
Date).

5.                                       We, the Additional
Facility N Lenders, agree:

(a)                                  to become party
to and to be bound by the terms of the Credit Agreement as Lenders in
accordance with Clause 2.2 (Additional Facilities) of the Credit Agreement;
and

(b)                                 to become party
to the Security Deed as Lenders and to observe, perform and be bound by the
terms and provisions of the Security Deed in the capacity of Lenders in
accordance with Clause 9.3 (Transfers by Lenders) of the Security Deed.

6.                                       The Additional
Facility Commitment in relation to an Additional Facility N Lender (for the
purpose of the definition of Additional Facility Commitment in Clause 1.1
(Definitions) of the Credit Agreement) is its Facility N Commitment.

7.                                       Any interest due
in relation to Facility N will be payable on the last day of each Interest
Period in accordance with Clause 8 (Interest) of the Credit Agreement.

8.                                       (a)           The Availability Period in relation
to this Additional Facility is the period from and including the date of this
Agreement up to and including the earlier of:

(i)                                      the first
Utilisation Date under this Additional Facility; and

(ii)                                   20 May 2007,

or
such later date as all the Additional Facility N Lenders may agree at their
discretion.

(b)                                 Facility N may be
drawn by one Advance and no more than one Request may be made in respect of
Facility N under the Credit Agreement.

9.                                       (a)           The Facility N Advance will be used first
in permanent prepayment and cancellation of 100 per cent. of all outstanding Facility
J2 Advances and 100 per cent. of all outstanding Facility K2 Advances; and

(b)                                 To the extent
that each of the Facility J2 and Facility K2 have been permanently repaid and
cancelled in full, the Facility N Advance may also be used for general
corporate purposes and working capital purposes including the repayment of
existing indebtedness.

10.                                 The Final
Maturity Date in respect of this Additional Facility is the earlier of:

(a)                                  31 December 2014;
and

(b)                                 if by the date
(the Relevant Date) falling 90 days prior to
the date on which the UPC Holding BV issued bonds due 2014 (the Bonds) fall due, those Bonds have not been repaid, redeemed
or refinanced, the Relevant Date.

11.                                 The outstanding
Facility N Advances will be repaid in full on the Final Maturity Date.

 2
 

12.                                 The Borrower will
ensure that the amount of the Facility N Advance must be no less than the
aggregate amount of all outstanding Facility J2 and K2 Advances at the time the
Facility N Advance is made.

13.                                 The Margin will
be 1.75 per cent. per annum.

14.                                 The Borrower in
relation to Facility N is UPC Financing.

15.                                 In the event
that, on or before 16 May 2008, the whole or any part of an outstanding
Facility N Advance is prepaid pursuant to Clause 7.3 (Voluntary prepayment) of
the Credit Agreement, UPC Broadband will, at the same time, pay to each
Additional Facility N Lender which is to receive any such prepayment an amount
equal to 1 per cent. of the principal amount to be prepaid to that Additional
Facility N Lender.  This paragraph 15 may
be amended or waived with the prior written consent of the Facility Agent
(acting on the instructions of all Additional Facility N Lenders) and UPC
Broadband.

16.                                 Where an
Additional Facility N Lender assigns, transfers or novates its rights and/or
obligations in relation to Facility N under Clause 26.2 (Transfers by Lenders)
of the Credit Agreement, such assignment, transfer or novation shall be in a
minimum amount of €500,000.

17.                                 (a)           For the purposes of sub-paragraph (b)
below, Date of Successful Syndication shall
mean, in relation to this Agreement and any other Additional Facility N
Accession Agreement, the day on which each of the Underwriters (as defined in
the Commitment Letter) reduces its participation in each such Additional
Facility N Accession Agreement to a hold of zero.

(b)                                 Facility N may be
upsized by an aggregate amount of up to US$125,000,000 by an Additional
Facility N Accession Agreement that specifies (along with the other terms
specified therein) UPC Financing as the sole Borrower and which specifies
Additional Facility N Commitments denominated in US Dollars, to be drawn in US
Dollars, with the same Final Maturity Date and Margin as specified in this
Additional Facility Accession Agreement. Facility N shall not consolidate with
any other Additional Facility N Accession Agreement until the Date of
Successful Syndication.

(b)                                 For the purposes
of paragraph 15 and this paragraph 17, references to Additional Facility N
Lenders and Facility N Advances shall include Lenders and Advances made under
any other Additional Facility N Accession Agreements.

(c)                                  If the Borrower
so requests, an Interest Period for a Facility N Advance will end on the same
day as the current Interest Period for any other Facility N Advance denominated
in the same currency as that Facility N Advance.  On the last day of those Interest periods,
those Facility N Advances will be consolidated and treated as one Facility N
Advance.

18.                                The representations
and warranties set out in Clause 15 (Representations and Warranties) of the
Credit Agreement (with the exception of Clauses 15.6(a) (Consents), 15.10
(Financial condition), 15.12 (Security Interests), 15.13(b) (Litigation and
insolvency proceedings), 15.15 (Tax liabilities), 15.16 (Ownership of assets), 15.18
(Works Council), 15.19 (Borrower Group Structure), 15.20 (ERISA), 15.24 (UPC
Financing) and 15.25 (Dutch Banking Act)) are true and correct as if made at
the Effective Date with reference to the facts and circumstances then existing,
and as if each reference to the Finance Documents includes a reference to this
Agreement.

19.                                 We confirm to
each Finance Party that:

 3
 

(a)                                  we have made our
own independent investigation and assessment of the financial condition and
affairs of each Obligor and its related entities in connection with its
participation in the Credit Agreement and have not relied on any information
provided to us by a Finance Party in connection with any Finance Document; and

(b)                                 we will continue
to make our own independent appraisal of the creditworthiness of each Obligor
and its related entities while any amount is or may be outstanding under the
Credit Agreement or any Additional Facility Commitment is in force.

20.                                Each of the Additional
Facility N Lenders agrees that without prejudice to Clause 26.3 of the Credit
Agreement, each New Lender (as defined in a Novation Certificate) shall become,
by the execution by the Facility Agent of a Novation Certificate in the form of
part 1 or part 2 of Schedule 3 to this Agreement, bound by the terms of this
Agreement as if it were an original party hereto as an Additional Facility N
Lender and shall acquire the same rights and assume the same obligations
towards the other parties to this Agreement as would have been acquired and
assumed had the New Lender been an original party to this Agreement as an
Additional Facility N Lender.

21.                                 Each Additional Facility
N Lender amends the notice period in respect of drawdown requests under Clause
5.1 (Delivery of Request) of the Credit Agreement in respect of this Facility N
from three Business days before the Utilisation Date to two Business Days
before the Utilisation Date.

22.                                 The Facility
Office and address for notices of each Additional Facility N Lender for the
purposes of Clause 32.2 (Addresses for notices) of the Credit Agreement will
be that notified by each Additional Facility N Lender to the Facility Agent.

23.                                 This Agreement is
governed by English law.

24.                                 This Agreement
may be executed in any number of counterparts and, in the case of each
Additional Facility N Lender, each Additional Facility N Lender’s counterpart
will, only contain the details of that Additional Facility N Lender, and this
has the same effect as if the signatures on the counterparts were on a single
copy of this Agreement.  All such
counterparts shall be read together as one agreement.

 4
 

SCHEDULE 1

ADDITIONAL
FACILITY N LENDERS AND COMMITMENTS

	
  Additional Facility N Lender

  	
   

  	
  Facility N Commitment

  	
   

  
	
   

  	
   

  	
  (US$)

  	
   

  
	
  Toronto Dominion
  (Texas) LLC

  	
   

  	
  1,775,000,000

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  Total

  	
   

  	
  US$     1,775,000,000

  	
   

  

 

 5
 

 

SCHEDULE 2

CONDITIONS
PRECEDENT DOCUMENTS

1.                                      Constitutional
Documents

(a)                                  A copy of the
constitutional documents of each Obligor (other than UPC Financing) and the
partnership agreement of UPC Financing or, if the Facility Agent already has a
copy, a certificate of an authorised signatory of the relevant Obligor
confirming that the copy in the Facility Agent’s possession is still correct,
complete and in full force and effect as at a date no earlier than the date of
this Agreement.

(b)                                 An extract of the
registration of each Obligor established in the Netherlands in the trade
register of the Dutch Chamber of Commerce.

2.                                      Authorisations

(a)                                  A copy of a
resolution of the board of managing and, to the extent applicable, board of
supervisory directors (or equivalent) and, to the extent that a shareholders’
resolution is required, a copy of the shareholders’ resolution of each Obligor:

(i)                                     approving the terms
of and the transactions contemplated by this Agreement and (in the case of UPC Broadband
and UPC Financing) resolving that it execute the same (and, in the case of the
Guarantors and the Charging Entities (as defined in the Security Deed)
resolving that it execute the confirmation described at paragraph 4(b) below;
and

(ii)                                  (in the case of
UPC Broadband and UPC Financing) authorising the issuance of a power of
attorney to a specified person or persons to execute this Agreement on its
behalf and (in the case of the Guarantors and the Charging Entities (as defined
in the Security Deed)) authorising the issuance of a power of attorney to a
specified person or persons to execute the confirmation described in paragraph
4(b) below.

(b)                                 A specimen of the
signature of each person authorised pursuant to its constitutional documents or
to the power of attorney referred to in paragraph (a) above to sign this
Agreement or the confirmation described in paragraph 4(b) below (as
appropriate).

(c)                                  A certificate of
an authorised signatory of UPC Broadband and UPC Financing certifying that each
copy document specified in this Schedule and supplied by UPC Broadband or UPC
Financing (as the case may be) is correct, complete and in full force and
effect as at a date no earlier than the date of this Agreement.

(d)                                 A copy of any
other authorisation or other document, opinion or assurance which the Facility
Agent has notified UPC Broadband is necessary in connection with the entry into
and performance of, and the transactions contemplated by, this Agreement or for
the validity and enforceability of this Agreement.

3.                                      Legal opinions

(a)                                  A legal opinion
of Allen & Overy LLP, English legal advisers to the Facility Agent,
addressed to the Finance Parties.

 6
 

(b)                                 A legal opinion
of Allen & Overy LLP, Dutch legal advisers to the Facility Agent, addressed
to the Finance Parties.

(c)                                  A legal opinion
of Allen & Overy LLP, New York legal advisers to the Facility Agent,
addressed to the Finance Parties.

4.                                      Other documents

(a)                                  Confirmation (in writing)
from (i) each of the Guarantors that its obligations under Clause 14
(Guarantee) of the Credit Agreement and (ii) each of the Charging Entities (as
defined in the Security Deed) that the Security Interests granted to the
Beneficiaries pursuant to the Security Documents and its obligations under the
Finance Documents, shall continue unaffected and that such obligations extend
to the Total Commitments as increased by the addition of Facility N and that
such obligations shall be owed to each Finance Party including the Additional
Facility N Lenders.

(b)                                 Evidence that UPC
Broadband has delivered a duly completed Prepayment Notice to the Facility
Agent giving notice of prepayment of the whole of the outstanding advances
under Facility J2 and Facility K2.

 7
 

SCHEDULE 3

NOVATION
CERTIFICATES

PART 1

NOVATION CERTIFICATE (CASH)

To:          [     ] as
Facility Agent and [BORROWER]

From:      [THE EXISTING LENDER] and [THE NEW LENDER]                                   Date:
[          ]

UPC
Broadband Holding B.V. - e1,072,000,000 Term Credit Agreement
dated 16 January, 2004 (the Credit Agreement)

We
refer to Clause 26.3 (Procedure for novations) of the Credit Agreement and
clause 9.3 (Transfers by the Lenders) of the Security Deed.  Terms defined in the Credit Agreement or, if
not defined in the Credit Agreement, the Additional Facility Accession
Agreement between the Facility Agent, the Security Agent and the Additional
Facility N Lenders dated [         ] 2007,
have the same meaning in this Novation Certificate.

1.                                       We
[             ]
(the Existing Lender) and
[     ] (the New Lender)
agree to the Existing Lender and the New Lender novating all the Existing
Lender’s rights and obligations referred to in the Schedule in accordance with
Clause 26.3 (Procedure for novations) of the Credit Agreement and clause 9.3
(Transfers by the Lenders) of the Security Deed.

2.                                       The New Lender
confirms that

it is bound by the terms of the Additional Facility Accession Agreement
as if it were an original party thereto as an
Additional Facility N Lender and shall acquire the same rights and assume the
same obligations towards the other parties to this Agreement as would have been
acquired and assumed had the New Lender been an original party to this
Agreement as an Additional Facility N Lender.

3.                                       The Facility
Office and address for notices of the New Lender for the purposes of
Clause 32.2 (Addresses for notices) are set out in the Schedule.

4.                                       This Novation
Certificate may be executed in any number of counterparts and this has the same
effect as if the signatures on the counterparts were on a single copy of this
Novation Certificate.

5.                                       The specified
date for the purposes of Clause 26.3 (c) (Procedure for novations) is [             ] 2007.

6.                                       This Novation
Certificate is governed by English law.

 8
 

THE
SCHEDULE

Rights and obligations to be novated

[Details of the rights and obligations of the Existing Lender to be
novated.]

	
  [New Lender]

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  [Facility Office

  	
  Address for notices for administrative purposes

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  Address for notices for credit purposes]

  	
   

  
	
   

  	
   

  	
   

  
	
  [Existing
  Lender]

  	
  [New Lender]

  	
  [                    ]

  
	
   

  	
   

  	
   

  
	
  By:

  	
  By:

  	
  By:

  
	
   

  	
   

  	
   

  
	
  Date:

  	
  Date:

  	
  Date:

  

 

 9
 

PART
2

NOVATION
CERTIFICATE (CASHLESS)

To:          Toronto Dominion (Texas) LLC as
Facility Agent and UPC Financing as Borrower

From:      Toronto Dominion (Texas) LLC and [the EXISTING
[J2][K2] LENDER / NEW N LENDER]

Date:
[          ] April 2007

UPC
Broadband Holding B.V. - e1,072,000,000 Term Credit Agreement
dated 16 January, 2004 (the Credit Agreement)

We
refer to:

(b)                                 Clause 26.3
(Procedure for novations) of the Credit Agreement;

(c)                                  Clause 9.3
(Transfers by the Lenders) of the Security Deed;

(d)                                 the Additional
Facility [J][K] Accession Agreement; and

(e)                                  the US$1,775,000,000
term loan Additional Facility N Accession Agreement.

Terms defined in the Credit Agreement or, if not defined in the Credit
Agreement, the Additional Facility [J][K] Accession Agreement or the US$1,775,000,000
term loan Additional Facility N Accession Agreement (as the case may be), have
the same meaning in this Novation Certificate.

7.                                       [               ] (the Existing [J2][K2]
Lender) agrees to novate and Toronto Dominion (Texas) LLC (the New [J2][K2] Lender) agrees to accept novation immediately
prior to funding  of US$1,775,000,000
term loan facility under Facility N  on
the Effective Date of all the Existing [J2][K2] Lender’s rights and obligations
referred to in the Schedule in accordance with Clause 26.3 (Procedure for
novations) of the Credit Agreement and clause 9.3 (Transfers by the Lenders) of
the Security Deed.

8.                                       Immediately
following the funding of the US$1,775,000,000 term loan under Facility N on the
Effective Date, Toronto Dominion Texas LLC (the Existing N
Lender) agrees to novate and [                         ]
(the New N Lender) agrees to accept the
novation of all the Existing N Lender’s rights and obligations referred to in
the Schedule in accordance with Clause 26.3 (Procedure for novations) of
the Credit Agreement and clause 9.3 (Transfers by the Lenders) of the Security
Deed.

9.                                       The aggregate
Existing [J2][K2] Commitment (at par) will be equal to the aggregate Existing N
Commitment (at par) (each as referred to in the schedule to this certificate).
The Existing [J2][K2] Commitment shall be deemed to be transferred by the
Existing [J2][K2] Lender to the New [J2][K2] Lender and The Existing N Lender’s
obligation to transfer the Existing N Commitment to the New N Lender will be
deemed to be satisfied, in each case on the Effective Date in the order
contemplated by the paragraphs above.

 10
 

10.                                 The New N lender
confirms that it is bound by the terms of the Additional Facility N
Accession Agreement as if it were an original party thereto as an
Additional Facility N Lender and shall acquire the same rights and assume the
same obligations towards the other parties to the Additional
Facility N Accession Agreement as would have been acquired and
assumed had the New Lender been an original party to the Additional Facility N Accession Agreement as an
Additional Facility N Lender.

11.                                 This Novation
Certificate may be executed in any number of counterparts and this has the same
effect as if the signatures on the counterparts were on a single copy of this
Novation Certificate.

12.                                 This certificate
shall take effect on the date of this certificate.

13.                                 For the purposes
of this certificate, “Effective Date”
means the date specified under the Facility Agent’s name in the relevant
signature page to this Novation Certificate.

14.                                 This Novation
Certificate is governed by English law.

 11
 

THE
SCHEDULE

Rights and obligations to be novated:

1.                                      Existing [J2][K2] Lender

Existing
[J2] Commitment: US$[         ]

Existing
K2 Commitment: US$[                          ]

Existing J2 Loans Outstanding: US$[                               ]

Existing [K2] Loans Outstanding:
US$[                           ]

Assignee: New [J2][K2] Lender

2.             Existing N Lender

Existing
N Commitment: US$[            ]

Existing
N Loans Outstanding: US$[                ]

Assignee: New N Lender

 12
 

SIGNATORIES

SIGNATURES
OF ALL FACILITY N LENDERS

TORONTO
DOMINION (TEXAS) LLC

By:
Authorized Signatory

TORONTO
DOMINION (TEXAS) LLC as Facility Agent

By:
Authorized Signatory

TD
BANK EUROPE LIMITED as Security Agent

By:
Authorized Signatory

UPC
BROADBAND HOLDING B.V.

By:
Authorized Signatory

By:
Authorized Signatory

UPC
FINANCING PARTNERSHIP

By:
Authorized Signatory

By:
Authorized Signatory

 

 13Exhibit 10.20

April 6, 2007

A. Richard Juelis

2829 Bowling Green Drive

Walnut Creek, California 94598

Dear Rich,

This
letter agreement will memorialize certain modifications to the terms of your
employment and compensation by World Heart Corporation (the “Company”)
in connection with the Company’s
efforts to monetize its Canadian tax
loss carryforwards (the “Monetization Project”) and prepare for reincorporation
in the United States.

Effective
as of the date hereof, in addition to your usual duties and responsibilities as
Vice President, Finance and Chief Financial Officer of the Company, you will be
expected to devote a portion of your business time and attention to the Monetization Project as directed by
the Chief Executive Officer or the Board of Directors.

Salary Reduction

Effective
as of April 4, 2007, your current base salary will be decreased to: (i) 75% of
your current base salary during the remainder of the Company’s second fiscal
quarter of this fiscal year and (ii) 50% of your current base salary during the
Company’s third fiscal quarter and thereafter, in each case, subject to
applicable withholdings, in accordance with the Company’s standard payroll
practices. You will
continue to be able to participate in the Company’s benefit plans that are generally
made available to full-time employees from time to time, in accordance with
their stated terms and conditions.  Of
course, the Company’s benefit plans are subject to the Company’s right to amend
or terminate them in its sole and absolute discretion.

Special Incentive Bonus

As
a special incentive bonus in connection with the Monetization Project, if
successfully completed, you would be entitled to receive 5% of the aggregate
gross monetization proceeds to the Company, the first one-third of which would
be payable in the Company’s common shares (the “Special Bonus Shares”) issuable
under the Company’s 2006 Equity Incentive Plan (the “Plan”). You will vest in
the Special Bonus Shares upon the Company entering into a definitive agreement
for the purposes of monetization, provided that you are providing
services to the Company at the time such definitive agreement is entered into,
and in that case such Special Bonus Shares will be earned and payable when
vested.  The number of Special Bonus Shares
will be determined by dividing the cash equivalent of the one-third of the 5%
of the gross monetization

proceeds
set forth in such definitive agreement or plan of arrangement by the closing
trading price per share on the Nasdaq Capital Market (or such other market on
which the Company’s common shares are then traded) on the day before the date
of determination. The remaining two-thirds of the special incentive bonus will
be payable in cash upon successful completion of the Monetization Project and
the receipt by the Company of the total monetization proceeds in one or more
tranches, pro rata, if such proceeds are received in one or more tranches by
the Company. This remaining two-thirds cash portion of the special incentive
bonus will be payable if you are continuing to perform services for the Company
on the Monetization Project, even if you are not an employee at the time such
total monetization proceeds are received, except in the event of your prior
termination for Cause (as defined in the Plan).

Notwithstanding
anything else herein to the contrary, the vesting of the Special Bonus Shares
(but not of any other portion of the special incentive bonus) will be
accelerated by the Board of Directors in the event that the Board of Directors
determines that, despite your efforts and contribution to the preparation,
negotiation and implementation of the Monetization Project, the transaction is
not completed and no definitive agreement or plan of arrangement is entered
into, provided that all of the following conditions are met: (i) the
definitive agreement is not executed due to an event or events outside of your
control, such as changes in the applicable Canadian tax laws resulting in the
inability to monetize tax losses, unforeseen bankruptcy of the potential buyer
or bad faith refusal to proceed on behalf of the potential buyer; (ii) the
preparation efforts relating to the Monetization Project have been
substantially completed as determined in good faith by the Board of Directors
of the Company; and (iii) the Company’s Board of Directors approved a
resolution to proceed with the reincorporation in the United States.

In
the event that all of the foregoing conditions are met, the Special Bonus
Shares will be vested, earned and payable, and the determination of the number
thereof will be made by the Board of Directors based upon the amount of the
previously targeted monetization proceeds  as set forth
in a letter of intent or other similar non-binding agreement relating to the
Monetization Project. If such letter of intent refers to a range of possible
proceeds to the Company, the determination of the number of Special Bonus
Shares will be made based upon the middle of that range.

Performance Shares Grant

In
addition, subject to approval by the Compensation Committee or the Board of
Directors, you will be awarded a grant of up to 50,000 performance shares (the “Performance
Shares”) pursuant to the terms and conditions of the Plan and the Performance
Share Grant Notice and Agreement under the Plan.   The Performance Shares will be earned upon
the achievement by you of performance milestones as follows: 50,000 shares in
the event of and upon substantial completion of an equity or debt financing
transaction by the Company resulting in gross proceeds of not less than $15  million by September 30, 2007; provided that you are
providing services to the 

Company
at the time such transaction is substantially completed.  These Performance Shares will be fully vested
when paid, which shall be immediately upon the achievement of the performance
milestones, and in any event not later than within two and a half months after
the end of the fiscal year in which the Compensation Committee or the Board of
Directors determines that the performance goals have been achieved.

It is important that you
understand that your employment with the Company is at-will.  As such, by accepting the terms of this
letter agreement, you acknowledge that there is no agreement, express or
implied, between yourself and the Company for any specific period of
employment, nor for continuing or long-term employment.  Both you and the Company have the right to
terminate your employment, with or without cause, and with or without notice,
at any time for any reason.  Upon any
such termination, except as set forth in this letter agreement, you will be
entitled only to any base salary due through your last day worked, and any
accrued but unused paid time off.

Except
as expressly modified by this letter agreement, all terms, conditions and
provisions of your existing agreements governing the terms of your employment
by the Company, including without limitation your offer letter dated May 27,
2005 and your Proprietary Right Agreement, shall continue in full force and effect.

This letter agreement
shall be construed under and governed by the laws of the State of California,
without regard to any conflict of law provisions, and shall be binding upon and
inure to the benefit of the parties hereto and their respective heirs, personal
representatives, successors or permitted assigns.  If any portion of this letter agreement
should be determined by a court or arbitrator to be illegal, invalid or
unenforceable, the remaining parts of the letter agreement will not be affected
thereby and any such illegal, invalid or unenforceable part shall be revised by
such court or arbitrator to the minimum extent necessary to render such part
legal, valid, and enforceable, while preserving as much as possible the
original intent of the parties.

You may wish to consult
with your own legal counsel or tax advisors prior to determining whether to
accept these terms of this letter agreement.

If you wish to accept
these terms of this letter agreement, please sign this letter in the
space provided.

Very truly yours,

World Heart Corporation

	
  By:

  	
   

  	
  /s/ Jal S. Jassawalla

  	
   

  	
   

  
	
   

  	
   

  	
  Jal S. Jassawalla

  President and Chief Executive Officer

  	
   

  	
   

  

 

I UNDERSTAND AND ACCEPT THE TERMS AND CONDITIONS OF
THE LETTER AGREEMENT SET FORTH ABOVE.

	
  /s/ A. Richard
  Juelis

  	
   

  	
  April 6, 2007

  	
   

  	
   

  
	
  A. Richard Juelis

  	
   

  	
  Date

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