PMID- 37747625
OWN - NLM
STAT- MEDLINE
DCOM- 20240307
LR  - 20240309
IS  - 1880-344X (Electronic)
IS  - 1349-0222 (Print)
IS  - 1349-0222 (Linking)
VI  - 22
IP  - 1
DP  - 2024 Mar
TI  - Reliable measurement methods for the isovolumic relaxation time: comparisons of 
      dual gate Doppler and seven other methods.
PG  - 34-40
LID - 10.1007/s12574-023-00624-w [doi]
AB  - PURPOSE: Isovolumic relaxation time (IVRT) is a useful indicator of diastolic 
      dysfunction. However, a measurement method for IVRT has not been established. The 
      Dual Gate Doppler method, which can record two separate pulse-wave Doppler 
      signals simultaneously using two sample gates, may be ideal for measuring IVRT. 
      This study aimed to evaluate the accuracy of IVRT measured using conventional 
      methods versus that measured using the Dual Gate Doppler method. METHODS: A total 
      of 104 patients (mean age 58 +/- 21 years, 48 women) were examined using ultrasound 
      equipment with Dual Gate Doppler at our hospital. In addition to Dual Gate 
      Doppler method, IVRTs were measured using seven different methods: pulsed Doppler 
      (PW method), continuous wave Doppler (CW method), and other methods. The IVRT 
      values obtained using the Dual Gate Doppler method were compared with those 
      measured using other methods. RESULTS: All IVRTs measured using conventional 
      methods showed a strong correlation with the that measured using the Dual Gate 
      Doppler method. However, there were slight deifferences among the IVRTs depending 
      on the method. The PW method and the PW time difference method using only the PW 
      showed small statistical bias and were not complicated. The IVRT measured using 
      the CW method was significantly longer than that measured using the Dual Gate 
      Doppler method. CONCLUSIONS: Among the conventional methods, the PW method was 
      the simplest and most practical method for measuring the IVRT in any conditions 
      as arrhythmias. It is important to recognize the characteristics of IVRTs based 
      on the measurement method.
CI  - (c) 2023. The Author(s).
FAU - Kimura, Noriko
AU  - Kimura N
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Toide, Hiroyuki
AU  - Toide H
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Kobayashi, Sayuki
AU  - Kobayashi S
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan. 
      sayuki@dokkyomed.ac.jp.
AD  - Department of Cardiology, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan. 
      sayuki@dokkyomed.ac.jp.
FAU - Tsujimoto, Emi
AU  - Tsujimoto E
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Honda, Asuka
AU  - Honda A
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Sawada, Kenta
AU  - Sawada K
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Higashi, Ayako
AU  - Higashi A
AD  - Department of Cardiology, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Koshikawa, Yuri
AU  - Koshikawa Y
AD  - Department of Cardiology, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Hana, Shinsei
AU  - Hana S
AD  - Department of Cardiology, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
FAU - Itabashi, Yuji
AU  - Itabashi Y
AD  - Center of Medical Ultrasonics, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
AD  - Department of Cardiology, Saitama Medical Center, Dokkyo Medical University, 
      2-1-50 Minamikoshigaya, Koshigaya City, Saitama, 343-8555, Japan.
LA  - eng
PT  - Journal Article
DEP - 20230925
PL  - Japan
TA  - J Echocardiogr
JT  - Journal of echocardiography
JID - 101263153
SB  - IM
MH  - Humans
MH  - Female
MH  - Adult
MH  - Middle Aged
MH  - Aged
MH  - *Echocardiography, Doppler, Pulsed/methods
MH  - Diastole
PMC - PMC10917855
OTO - NOTNLM
OT  - Continuous wave Doppler
OT  - Diastolic function
OT  - Dual Gate Doppler
OT  - Isovolumic relaxation time
OT  - Pulsed Doppler
COIS- The authors declare no conflicts of interest.
EDAT- 2023/09/25 12:42
MHDA- 2024/03/07 06:42
PMCR- 2023/09/25
CRDT- 2023/09/25 11:13
PHST- 2023/05/30 00:00 [received]
PHST- 2023/09/04 00:00 [accepted]
PHST- 2023/08/20 00:00 [revised]
PHST- 2024/03/07 06:42 [medline]
PHST- 2023/09/25 12:42 [pubmed]
PHST- 2023/09/25 11:13 [entrez]
PHST- 2023/09/25 00:00 [pmc-release]
AID - 10.1007/s12574-023-00624-w [pii]
AID - 624 [pii]
AID - 10.1007/s12574-023-00624-w [doi]
PST - ppublish
SO  - J Echocardiogr. 2024 Mar;22(1):34-40. doi: 10.1007/s12574-023-00624-w. Epub 2023 
      Sep 25.