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Conference Paper: A rapid ultrasonic cardiac output monitor method for optimization of ventriculo-ventricular interval (VVI) in cardiac resynchronization therapy.

TitleA rapid ultrasonic cardiac output monitor method for optimization of ventriculo-ventricular interval (VVI) in cardiac resynchronization therapy.
Authors
Issue Date2005
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/heartrhythmjournal
Citation
The 2005 Annual Scientific Sessions of the Heart Rhythm Society (Heart Rhythm 2005), New Orleans, LA., 4-7 May 2005. In Heart Rhythm, 2005, v. 2 n. 5 suppl., p. S84, abstract session 42 How to Cite?
AbstractOBJECTIVES: Ventriculo-ventricular Interval Optimization (VVO) is critical for cardiac resynchronization therapy (CRT). However, this is usually a labor-intensive, expensive and time consuming procedure. The Ultrasonic Cardiac Output Monitor (USCOM Ltd, Australia) is a portable, 2D independent hemodynamic monitor that uses a special 2.2 MHz transducer over the supra-sternal notch to measure aortic flow to compute minute distance (MD, a reflection of cardiac output, CO). PATIENTS (PTS) AND METHODS: We studied 7 pts with CRT (mean age 70±8) with the mean EF (24±9%) at recruitment. AVO was first performed by an echo physician using the Ritter’s formula. After determining the optimal AV interval, the highest Doppler trans-aortic flow determined CO and the highest MD from the aortic Doppler at 11 VV intervals (RV80, RV60, RV40, RV20, RV12, 0, LV12, LV20, LV40, LV60 and LV80) in random sequence by the same echo physician and a nurse who were blind to the sequence. RESULTS: The Doppler and USCOM determined VVI were all within 20ms. 5 pts (71%) had 100% concordant in VV interval, the remaining 2 pts had VVI difference within 20ms. The USCOM determined VVI were well correlated with the Doppler determined VVI. (r2 0.92, p<0.01) However, the mean durations USCOM was significantly shorted than trans-aortic Doppler determined CO. (47±14 min vs 89±8 min p <0.001). CONCLUSION: Echo-independent USCOM determined MD allows rapid VVO without the need of specialized echo-machine and personnel. USCOM may be a cost-effective device for hemodynamic optimization of VV interval for CRT pts.
Persistent Identifierhttp://hdl.handle.net/10722/101929
ISSN
2015 Impact Factor: 4.391
2015 SCImago Journal Rankings: 2.756

 

DC FieldValueLanguage
dc.contributor.authorSiu, CWen_HK
dc.contributor.authorTse, HFen_HK
dc.contributor.authorLee, KLFen_HK
dc.contributor.authorLam, YMen_HK
dc.contributor.authorChan, HWen_HK
dc.contributor.authorYung, LYen_HK
dc.contributor.authorLau, CP-
dc.date.accessioned2010-09-25T20:10:09Z-
dc.date.available2010-09-25T20:10:09Z-
dc.date.issued2005en_HK
dc.identifier.citationThe 2005 Annual Scientific Sessions of the Heart Rhythm Society (Heart Rhythm 2005), New Orleans, LA., 4-7 May 2005. In Heart Rhythm, 2005, v. 2 n. 5 suppl., p. S84, abstract session 42en_HK
dc.identifier.issn1547-5271en_HK
dc.identifier.urihttp://hdl.handle.net/10722/101929-
dc.description.abstractOBJECTIVES: Ventriculo-ventricular Interval Optimization (VVO) is critical for cardiac resynchronization therapy (CRT). However, this is usually a labor-intensive, expensive and time consuming procedure. The Ultrasonic Cardiac Output Monitor (USCOM Ltd, Australia) is a portable, 2D independent hemodynamic monitor that uses a special 2.2 MHz transducer over the supra-sternal notch to measure aortic flow to compute minute distance (MD, a reflection of cardiac output, CO). PATIENTS (PTS) AND METHODS: We studied 7 pts with CRT (mean age 70±8) with the mean EF (24±9%) at recruitment. AVO was first performed by an echo physician using the Ritter’s formula. After determining the optimal AV interval, the highest Doppler trans-aortic flow determined CO and the highest MD from the aortic Doppler at 11 VV intervals (RV80, RV60, RV40, RV20, RV12, 0, LV12, LV20, LV40, LV60 and LV80) in random sequence by the same echo physician and a nurse who were blind to the sequence. RESULTS: The Doppler and USCOM determined VVI were all within 20ms. 5 pts (71%) had 100% concordant in VV interval, the remaining 2 pts had VVI difference within 20ms. The USCOM determined VVI were well correlated with the Doppler determined VVI. (r2 0.92, p<0.01) However, the mean durations USCOM was significantly shorted than trans-aortic Doppler determined CO. (47±14 min vs 89±8 min p <0.001). CONCLUSION: Echo-independent USCOM determined MD allows rapid VVO without the need of specialized echo-machine and personnel. USCOM may be a cost-effective device for hemodynamic optimization of VV interval for CRT pts.-
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/heartrhythmjournalen_HK
dc.relation.ispartofHeart Rhythmen_HK
dc.rightsHeart Rhythm. Copyright © Elsevier Inc.en_HK
dc.titleA rapid ultrasonic cardiac output monitor method for optimization of ventriculo-ventricular interval (VVI) in cardiac resynchronization therapy.en_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1547-5271&volume=2&spage=S84&epage=&date=2005&atitle=A+rapid+ultrasonic+cardiac+output+monitor+method+for+optimization+of+ventriculo-ventricular+interval+(VVI)+in+cardiac+resynchronization+therapy.en_HK
dc.identifier.emailTse, HF: hftse@hkucc.hku.hken_HK
dc.identifier.emailLee, KLF: klflee@HKUCC.hku.hken_HK
dc.identifier.emailLau, CP: cplau@hku.hken_HK
dc.identifier.authorityTse, HF=rp00428en_HK
dc.identifier.doi10.1016/j.hrthm.2005.02.262-
dc.identifier.hkuros100896en_HK
dc.identifier.volume2en_HK
dc.identifier.issue5 suppl.-
dc.identifier.spageS84, abstract session 42en_HK
dc.identifier.epageS84, abstract session 42-

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