{"id":2554,"date":"2017-05-02T10:40:27","date_gmt":"2017-05-02T14:40:27","guid":{"rendered":"https:\/\/support.mindwaretech.com\/?post_type=ht_kb&p=2554"},"modified":"2017-05-02T10:46:55","modified_gmt":"2017-05-02T14:46:55","slug":"kb0065","status":"publish","type":"ht_kb","link":"https:\/\/support.mindwaretech.com\/knowledge-base\/kb0065\/","title":{"rendered":"KB0065: Selecting a dZ\/dt Source in IMP Analysis Application"},"content":{"rendered":"

Only two signals are required for analysis in the Impedance Cardiography (IMP) analysis application – ECG and Zo<\/sub>. The third signal used in analysis, dZ\/dt, is the inverted first derivative of the Zo<\/sub> signal\u00a0and can be derived in hardware and sampled during acqusition or derived in software post-acquisition. The hardware-derivation is done on a continuous basis and typically has better feature clarity than the software-derived alternative.<\/p>\n

Software-Derived dZ\/dt<\/h2>\n

You can enable software-derived dZ\/dt by navigating to the\u00a0Impedance Calibration Settings<\/strong> tab and selecting “Derive from Zo<\/sub><\/span>” as your\u00a0dZ\/dt source<\/strong>.<\/p>\n

\"\"<\/a><\/p>\n

If you only mapped a Zo<\/sub> channel, this source will be selected automatically.<\/p>\n

\n

 <\/p>\n

Hardware Measured dZ\/dt<\/h2>\n

Many devices (including all MindWare impedance cardiographs) will derive dZ\/dt from Zo<\/sub> in hardware during data collection. In these cases, you can map a dZ\/dt channel and use it directly. \u00a0You can ensure you are using the hardware-derived dZ\/dt measurement by changing the\u00a0dZ\/dt Source<\/strong> to “Measured”<\/p>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Only two signals are required for analysis in the Impedance Cardiography (IMP) analysis application – ECG and Zo. The third signal used in analysis, dZ\/dt, is the inverted first derivative of the Zo signal\u00a0and can be derived in hardware and sampled during acqusition or derived in software post-acquisition. The hardware-derivation […]<\/p>\n","protected":false},"author":2,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"ht-kb-category":[40],"ht-kb-tag":[286,284,287,285,309],"class_list":["post-2554","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-imp","ht_kb_tag-derived-dzdt","ht_kb_tag-dzdt","ht_kb_tag-dzdt-source","ht_kb_tag-z0","ht_kb_tag-zo"],"_links":{"self":[{"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb\/2554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/comments?post=2554"}],"version-history":[{"count":7,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb\/2554\/revisions"}],"predecessor-version":[{"id":2695,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb\/2554\/revisions\/2695"}],"wp:attachment":[{"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/media?parent=2554"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb-category?post=2554"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.mindwaretech.com\/wp-json\/wp\/v2\/ht-kb-tag?post=2554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}