Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2008.2407.2412AkbarzadehF. ToufanM. 1220081120The Cardiac Output (CO), Filling Time (FT) and Myocardial
Performance Index (MPI) derived optimal atrioventricular delay (AVD),
were compared and systolic and diastolic performance at every optimal
AVD were analyzed. Thirty-two patients with implanted DDD pacemaker were
investigated from implantation time to 6 months following PM implantation,
in Cardiovascular Research Center of Tabriz University of Medical Sciences.
The evaluation was performed during AV sequential pacing with different
programmed AVDS ranged from 100 to 200 msec by steps of 20-30 msec. At
every AVD, the following parameters were measured: FT, mitral VTI, ET,
aortic VTI, ICT and IRT. CO and FT derived optimal AVDs were significantly
different (146±37 and 126±35 msec, respectively), but their
difference with MPI derived optimal AVDs was not significant (130±28
msec). ICT/ET was similar at CO, FT and MPI derived optimal AVD (0.24±0.10,
0.22±0.05 and 0.20±0.07, respectively). IRT/ET ratio was
similar at CO, FT and MPI derived optimal AVDs (0.46±0.14, 0.45±0.10
and 0.42±0.10, respectively). Different methods indicate different
optimal AVDs. However analysis of systolic and diastolic performance shows
that different AVDs result in similar systolic or diastolic performance.
At MPI optimized AVD, a high CO combined with the most advantageous conditions
of both isovolumic contraction and relaxation phases is achieved.]]>Dupuis, J.M., A. Kobeissi, L. Vitali, G. Gaggini and M. Merheb et al.,200326210213Ishikawa, T., T. Sugano, S. Sumita, K. Kimura and M. Kikuchi,19991192196Ishikawa, T., T. Sugano, S. Sumita, M. Kosuge and I. Kobayashi et al.,200367515518Ishikawa, T., T. Suganao, S. Sumita, T. Nakagawa and M. Hanada et al.,200134651Ishikawa, T., T. Sugano, S. Sumita, N. Toda and M. Kosuge et al.,200225195200Ishikawa, T., S. Sumita, K. Kimura, M. Kikuchi and M. Kosuge,19992213651371Ishikawa, T., S. Sumita, K. Kimura, M. Kikuchi and M. Kosuge et al.,200064579582Kedia, N., K. Ng, C. Apperson-Hansen, C. Wang and P. Tchou et al.,200615780785Kerlan, J.E., N.S. Sawhney, A.D. Waggoner, M.K. Chawla and S. Garhwal et al.,20063148154Kubica, J., G. Swiatecka, S. Sielski, L. Stolarczyk and G. Raczak,199339447451, (In Polish)Maurer, D.E., B. Naegeli, E. Straumann, O. Bertel and J. Frielingsdorf,20035411417Meluzín, J., M. Novák, J. Müllerová, J. Krejcí and P. Hude et al.,2004275864Melzer, C., A.C. Borges, F. Knebel, W.S. Richter and W. Combs et al.,200423030Moller, J.E., S.H. Poulsen and K. Egstrup,19991210651072Parravicini, U., A. Mezzani, M. Bielli, T. Di Camillo and N.F. Pardo et al.,20002314481450Porciani, M.C., G. Corbucci, F. Fantini, N. Musilli and A. Sabini et al.,200427333338Porciani, M.C., C. Dondina, R. Macioce, G. Demarchi and F. Cappelli et al.,200612715719Styliadis, I.H., C.E. Papadopoulos, N.I. Gouzoumas, G. Giannakoulas and H.I. Karvounis et al.,20066243247Sulke, A.N., J.B. Chambers and E. Sowton,199213464472Topilski, I., J. Sherez, G. Keren and I. Copperman,200650 years of age.]]>9717691775