<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-04-04</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001166463</issuerCik>
        <issuerName>VISICU INC</issuerName>
        <issuerTradingSymbol>EICU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001116842</rptOwnerCik>
            <rptOwnerName>PACIFIC VENTURE GROUP II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>114 PACIFICA, SUITE 270</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001099091</rptOwnerCik>
            <rptOwnerName>PVG ASSOCIATES II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>114 PACIFICA, SUITE 270</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001357111</rptOwnerCik>
            <rptOwnerName>PVG Equity Partners II LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>114 PACIFICA, SUITE 270</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series B Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2189781</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series B Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Comon Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>729928</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Immediately following the closing of the intitial public offering of the Issuer's Common Stock, all outstanding shares of Series B Convertible Preferred Stock and Series C Convertible Preferred Stock will be automatically converted into shares of the Issuer's Commmon Stock.</footnote>
        <footnote id="F2">Not Applicable.</footnote>
        <footnote id="F3">Immediately following the closing of the intitial public offerng of the Issuer's Common Stock, all outstanding shares of Series B Convertible Preferred Stock and Series C Convertible Preferred Stock will be automatically converted into shares of the Issuer's Commmon Stock.</footnote>
        <footnote id="F4">Includes 2,125,288 shares held by Pacific Venture Group II, L.P. and 64,493 shares held by PVG Associates II, L.P. PVG Equity Partners II, L.L.C. (&quot;PEP II&quot;) is the general partner of Pacific Venture Group II, L.P. and PVG Associates II, L.P. As the general partner of Pacific Venture Group II, L.P. and PVG Associates II, L.P. PEP II may be deemed a beneficial owner of the securities. Each Joint Filer expressly disclaims beneficial ownership of any securities not directly held by it, except to the extent of its pecuniary interest therein, if any.</footnote>
        <footnote id="F5">Includes 708,430 shares held by Pacific Venture Group II, L.P. and 21,498 shares held by PVG Associates II, L.P. PVG Equity Partners II, L.L.C. (&quot;PEP II&quot;) is the general partner of both Pacific Venture Group II, L.P. and PVG Associates II, L.P. As the general partner of Pacific Venture Group II, L.P. and PVG Associates II, L.P. PEP II may be deemed a beneficial owner of the securities. Each Joint Filer expressly disclaims beneficial ownership of any securities not directly held by it, except to the extent of its pecuniary interest therein, if any.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Gary Sindler, Attorney-in-fact</signatureName>
        <signatureDate>2006-04-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
