The CardioLog Analytics SharePoint Feature will work only for master pages which contain the following control in the head section:
<SharePoint:DelegateControl runat="server" ControlId="AdditionalPageHead" AllowMultipleControls="true"/>
This control is included in the master pages for all SharePoint templates, except for the MOSS Publishing Site master page.
Add this control to each of your master pages, right before the closing </HEAD> tag. Alternatively, in order to perform a single update, you can also use a top master file which is included in all of the Publishing Sites master pages.