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OMB
APPROVAL
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OMB
Number: 3235-0145
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Expires:
February 28, 2009
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Estimated
average burden
Hours
per response 10.4
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CUSIP
No. 042698308
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1. Name
of Reporting Persons
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I.R.S.
Identification Nos. of above persons (entities only)
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Healthinvest
Partners AB
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2. Check
the Appropriate Box if a Member of a Group (See
Instruction)
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(a) [
]
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(b) [X]
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3. SEC
Use Only
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4. Citizen
or Place of Organization
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Sweden
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Number
of 5. Sole
Voting Power 247,250
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------------------------------------------------------------------------------------------------------------
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Shares
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Beneficially 6. Shared
Voting Power
0
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-----------------------------------------------------------------------------------------------------------
Owned
by
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Each
7. Sole
Dispositive Power
247,250
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------------------------------------------------------------------------------------------------------------
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Reporting
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Person
With: 8. Shared
Dispositive Power 0
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9. Aggregate
Amount Beneficially Owned by Each Reporting Person
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247,250
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10.
Check
if the Aggregate Amount in Row (9) Excludes Certain
Shares
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(See
Instructions) [
]
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11.
Percent
of Class Represented by Amount in Row (9)
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9.3%
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12.
Type
of Reporting Person (See Instructions)
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IA,
HC
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CUSIP
No. 042698308
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------------------------------------------------
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1. Name
of Reporting Persons
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I.R.S.
Identification Nos. of above persons (entities only)
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HealthInvest
Global Long/Short Fund
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---------------------------------------------------------------------------------------------------------------------------------
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2. Check
the Appropriate Box if a Member of a Group (See
Instruction)
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(a) [
]
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(b) [X]
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---------------------------------------------------------------------------------------------------------------------------------
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3. SEC
Use Only
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---------------------------------------------------------------------------------------------------------------------------------
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4. Citizen
or Place of Organization
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Sweden
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---------------------------------------------------------------------------------------------------------------------------------
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Number
of 5. Sole
Voting Power
0
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------------------------------------------------------------------------------------------------------------
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Shares
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Beneficially 6. Shared
Voting Power
247,250
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-----------------------------------------------------------------------------------------------------------
Owned
by
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Each 7. Sole
Dispositive Power 0
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------------------------------------------------------------------------------------------------------------
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Reporting
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Person
With: 8. Shared
Dispositive Power
247,250
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---------------------------------------------------------------------------------------------------------------------------------
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9. Aggregate
Amount Beneficially Owned by Each Reporting Person
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247,250
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---------------------------------------------------------------------------------------------------------------------------------
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10.
Check
if the Aggregate Amount in Row (9) Excludes Certain
Shares
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(See
Instructions) [
]
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---------------------------------------------------------------------------------------------------------------------------------
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11.
Percent
of Class Represented by Amount in Row (9)
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9.3%
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12.
Type
of Reporting Person (See Instructions)
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OO
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Item
1(a)
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Name
of Issuer
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Arrhythmia
Research Technology, Inc.
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Item
1(b)
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Address
of Issuers Principal Executive Offices:
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25
Sawyer Passway
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Fitchburg,
Massachusetts 01420
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Item
2(a)
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Name
of Persons Filing:
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Healthinvest
Partners AB and HealthInvest Global Long/Short Fund
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Healthinvest
Partners AB is the investment advisor and control person of HealthInvest
Global Long/Short Fund, a security holder of the issuer. HealthInvest
Global Long/Short Fund is a specialty fund organized pursuant to
the
Swedish Mutual Funds Act.
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Item
2(b)
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Address
of Principal Business Office or, Residence:
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Arsenalsgatan
4
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SE-111
47 Stockholm
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Sweden
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Item
2(c)
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Citizenship:
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See
the response(s) to Item 4 on the attached cover
page(s).
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Item
2(d)
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Title
of Class of Securities:
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Common
Stock
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Item
2(e)
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CUSIP
Number:
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042698308
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Item
3
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If
this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b)
or (c),
check whether the person filing is a:
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Not
Applicable
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Item
4. Ownership
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(a)
Amount
Beneficially owned:
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See
the response(s) to Item 9 on the attached cover
page(s).
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(b)
Percent
of Class:
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See
the response(s) to Item 11 on the attached cover
page(s).
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(c)
Number
of shares as to which the person has:
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(i)
Sole
power to vote or to direct the vote:
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See
the response(s) to Item 5 on the attached cover
page(s).
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(ii)
Shared
power to vote or to direct the vote:
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See
the response(s) to Item 6 on the attached cover
page(s).
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(iii)
Sole
power to dispose or direct the disposition of:
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See
the response(s) to Item 7 on the attached cover
page(s).
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(iv) Shared
power to dispose or direct the disposition of:
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See
the response(s) to Item 8 on the attached cover
page(s).
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Item
5.
Ownership
of five percent or less of a class.
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Not
Applicable
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Item
6.
Ownership
of more than five percent on behalf of another person.
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Not
Applicable
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Item
7.
Identification
and Classification of the Subsidiary which acquired the Security
being
reported by the Parent Holding Company.
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Not
Applicable
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Item
8.
Identification
and Classification of Members of the Group.
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Not
Applicable
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Item
9.
Notice
of Dissolution of Group.
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Not
Applicable
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Item
10.
Certification
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By
signing below I certify that, to the best of my knowledge and belief,
the
securities referred to above were not acquired and are not held
for the
purpose of or with the effect of changing or influencing the control
of
the issuer of the securities and were not acquired and are not
held in
connection with or as a participant in any transaction having that
purpose
or effect.
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DATE: February
12, 2007
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HEALTHINVEST
PARTNERS AB
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By:
/s/
ANDERS HALLBERG
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Name: Anders
Hallberg
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Title: Managing
Director and CEO
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HEALTHINVEST
GLOBAL LONG/SHORT FUND
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By:
/s/
ANDERS HALLBERG
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Name: Anders
Hallberg
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Title: CEO
of Managing Company
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