Abstract:
BACKGROUND:It has been proved that sevoflurane postconditioning (SpostC) could protect the heart against myocardial ischemia/reperfusion injury, however, there has been few research focused on the electrophysiological effects of SpostC. The objective of the study was to investigate the effects of SpostC on action potential duration (APD) and L-type calcium current (I(Ca, L)) in isolated cardiomyocytes. METHODS:Langendorff perfused SD rat hearts were randomly assigned to one of the time control (TC), ischemia/reperfusion (I/R, 25 minutes of ischemia followed by 30 minutes of reperfusion), and SpostC (postconditioned with 3% sevoflurane) groups. At the end of reperfusion, epicardial myocytes were dissociated enzymatically for patch clamp studies. RESULTS:Sevoflurane directly prolonged APD and decreased peak I(Ca, L) densities in epicardial myocytes of the TC group (P < 0.05). I/R injury shortened APD and decreased peak I(Ca, L) densities in epicardial myocytes of the I/R group (P < 0.05). SpostC prolonged APD and increased peak I(Ca, L) densities in epicardial myocytes exposed to I/R injury (P < 0.05). SpostC decreased intracellular reactive oxygen species (ROS) levels, reduced the incidence of ventricular tachycardia and ventricular fibrillation, and decreased reperfusion arrhythmia scores compared with the I/R group (all P < 0.05). CONCLUSIONS:SpostC attenuates APD shortening and I(Ca, L) suppression induced by I/R injury. The regulation of APD and I(Ca, L) by SpostC might be related with intracellular ROS modulation, which contributes to the alleviation of reperfusion ventricular arrhythmia.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Gong JS,Yao YT,Fang NX,Huang J,Li LHsubject
Has Abstractpub_date
2012-10-01 00:00:00pages
3485-91issue
19eissn
0366-6999issn
2542-5641journal_volume
125pub_type
杂志文章abstract:OBJECTIVE:To study the prevalence of skin positivity to purified protein derivative (PPD) in human immunodeficiency virus (HIV)-infected patients in Hong Kong. METHODS:Consecutive clients of an HIV clinic were administered the PPD test and 2 units of PPD-RT23 were used. The area of induration was then measured in 48 t...
journal_title:Chinese medical journal
pub_type: 杂志文章
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abstract::Endolymphatic sac papillary tumor (ELST) is an extremely rare and aggressive tumor characterized by hearing loss and temporal bone destruction. A case with clinical, imaging, pathologic and treatment data is reported and relevant literature is reviewed. A 25-year-old woman, with ELST underwent craniotomy for tumor sub...
journal_title:Chinese medical journal
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journal_title:Chinese medical journal
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journal_title:Chinese medical journal
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pub_type: 杂志文章,随机对照试验
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doi:
更新日期:2012-04-01 00:00:00
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doi:
更新日期:1990-05-01 00:00:00
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更新日期:2012-03-01 00:00:00
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doi:
更新日期:2002-11-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:10.4103/0366-6999.241805
更新日期:2018-10-05 00:00:00
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journal_title:Chinese medical journal
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更新日期:1997-06-01 00:00:00
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doi:
更新日期:1994-09-01 00:00:00
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