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- isovolumic relaxation time, 等容弛緩時間
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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2013/07/10 12:58:24」(JST)
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Wiggers diagram of the cardiac cycle, with isovolumic relaxation marked at top.
Isovolumic relaxation time (IVRT) is an interval in the cardiac cycle, from the aortic component of the second heart sound, that is, closure of the aortic valve, to onset of filling by opening of the mitral valve.[1] It can be used as an indicator of diastolic dysfunction.
It can be measured by simultaneous Doppler echocardiography and M-mode sonography, or better still, by simultaneous phonocardiogram and transmitral Doppler.[2]
Prolonged IVRT indicates poor myocardial relaxation. A normal IVRT is about 70 ± 12 ms, and approximately 10ms longer in people over forty years.[2] In abnormal relaxation, IVRT is usually in excess of 110ms.[2] With restrictive ventricular filling, it is usually under 60 ms.[2]
References[edit]
- ^ Inductance cardiography (thoracocardiography): A novel, noninvasive technique for monitoring left ventricular filling. Journal of Critical Care, Volume 14, Issue 4, Pages 177-185
- ^ a b c d anaesthetist.com >Diastolic dysfunction Lara Hopley and Jo van Schalkwyk. Date of Last Update: 2009/06/05
UpToDate Contents
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- 1. 左室拡張機能の心エコー評価 echocardiographic evaluation of left ventricular diastolic function
- 2. 拡張期心不全の病態生理 pathophysiology of diastolic heart failure
- 3. 心不全または心筋症患者の評価 evaluation of the patient with heart failure or cardiomyopathy
- 4. 左室収縮機能測定のための非侵襲的方法 noninvasive methods for measurement of left ventricular systolic function
- 5. 収縮性心膜炎と拘束性心筋症の区別 differentiating constrictive pericarditis and restrictive cardiomyopathy
English Journal
- Diastolic ventricular function improves during the first 48-hours-of-life in infants weighting <1250 g.
- Sirc J1, Dempsey EM, Miletin J.
- Acta paediatrica (Oslo, Norway : 1992).Acta Paediatr.2015 Jan;104(1):e1-6. doi: 10.1111/apa.12788. Epub 2014 Oct 2.
- AIM: Few studies have focused on cardiac ventricular diastolic function in preterm neonates in the immediate post-natal period. This study evaluated Doppler-derived parameters of diastolic ventricular function in infants with birth weights of <1250 g during the transitional period.METHODS: This
- PMID 25163391
- Ia diastolic dysfunction: an echocardiographic grade.
- Pandit A1, Mookadam F, Hakim FA, Mulroy E, Saadiq R, Doherty M, Cha S, Seward J, Wilansky S.
- Echocardiography (Mount Kisco, N.Y.).Echocardiography.2015 Jan;32(1):56-63. doi: 10.1111/echo.12600. Epub 2014 Apr 4.
- OBJECTIVE: To demonstrate that a distinct group of patients with Grade Ia diastolic dysfunction who do not conform to present ASE/ESE diastolic grading exists.METHOD AND RESULTS: Echocardiographic and demographic data of the Grade Ia diastolic dysfunction were extracted and compared with that of Gra
- PMID 24698472
- Left ventricular restrictive filling pattern and the presence of contractile reserve in patients with low-flow/low-gradient severe aortic stenosis.
- Mahfouz RA1, El Zayat A, Yousry A.
- Echocardiography (Mount Kisco, N.Y.).Echocardiography.2015 Jan;32(1):65-70. doi: 10.1111/echo.12586. Epub 2014 Mar 25.
- OBJECTIVE: We sought to study diastolic function in patients with low-flow/low-gradient aortic stenosis (LF/LGAS) and to clarify the relationship between contractile reserve on dobutamine stress echocardiography (DSE) and the restrictive filling pattern on echocardiography in patients with LF/LGAS.P
- PMID 24661095
Japanese Journal
- 古幡 博
- 臨床神経学 49(11), 804-806, 2009-11-01
- … Transcranial ultrasonic diagnostic equipment has been approved to enhance the thrombolytic effect of IVrt-PA. … Moreover, transcranial sonothrombolysis with low frequency ultrasound has a great advantage in lytic effect of IVrt-PA. …
- NAID 10026290822
- 佐藤 寛之,酒井 貴史,水谷 行伸,林 綾子,池野 廣幸,草間 芳樹,新 博次
- 超音波検査技術 34(3), 297-305, 2009
- … SC-Peak ΔS showed correlation with isovolumic relaxation time (IVRT) (γ=−0.5538, p=0.00001). …
- NAID 130004491811
- The Relationship between Invasive Hemodynamic Measurements and Tissue Doppler-Derived Myocardial Velocity and Acceleration during Isovolumic Relaxation in Healthy Dogs
- Hori Yasutomo,Kunihiro Shoh-ich,Kanai Kazutaka [他],HOSHI Fumio,ITOH Naoyuki,HIGUCHI Sei-ichi
- Journal of Veterinary Medical Science 71(11), 1419-1425, 2009
- … Both dP/dt min and τ were significantly correlated with TDI-derived IVRT (r=-0.43 and 0.74), VIR (r=0.85 and -0.49) and ACC (r=0.84 and -0.52). …
- NAID 130000134312
Related Links
- Prolonged IVRT indicates poor myocardial relaxation. A normal IVRT is about 70 ± 12 ms, and approximately 10ms longer in people over forty years. In abnormal relaxation, IVRT is usually in excess of 110ms. With restrictive ventricular filling, ...
- Inland Valley Repertory Theatre · Home · Tickets · Auditions · 2013 Cast Lists · Workshops · Press · Donors of IVRT · About Us · Archives · Contact Us. Tickets on sale now at the Candlelight Pavilion for. Shakespeare's Classic. ROMEO & ...
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インターベンショナルラジオロジー interventional radiology