排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
Polymorphic Ventricular Tachycardia Induced During Tilt Table Testing in a Patient with Syncope and Probable Dysfunction of the Sinus Node 总被引:1,自引:0,他引:1
KOSTAS A. GATZOULIS IOANNIS E. MAMARELIS THEODOROS APOSTOLOPOULOS POLECHRONIS DILAVERIS JOHN GIALAFOS. And PAVLOS TOUTOUZAS 《Pacing and clinical electrophysiology : PACE》1995,18(5):1075-1079
We present a case of life-threatening arrhythmia occurring during tilt table testing in a 44-year-old man with syncope. Polymorphic ventricular tachycardia occurred while the patient was tilted up under the intravenous infusion of isoproterenol (2 μg/min). No ischemia, QTc prolongation, or electrolyte abnormality preceded this event. The arrhythmia was not induced by programmed ventricular stimulation or exercise testing. Based on electrophysiological and clinical data, the diagnosis of sick sinus syndrome was entertained. 相似文献
2.
3.
Assessment of Time Domain and Spectral Components of Heart Rate Variability Immediately Before Ischemic ST Segment Depression Episodes 总被引:1,自引:0,他引:1
POLYCHRONIS E. DILAVERIS GEORGE A. ZERVOPOULOS ZOI D. PSOMADAKI REAS P. MICHAELIDES JOHN E. GIALOFOS PAVLOS K. TOUTOUZAS 《Pacing and clinical electrophysiology : PACE》1996,19(9):1337-1345
In an attempt to study autonomic function during the 5-minute period preceding ischemic ST segment depression (↓ST) episodes, we selected 138 ↓ST episodes, without preceding ↓ST during the last 15 minutes before each episode, from the Holler tapes of 35 patients with multivessel coronary artery disease. For the 5-minute period preceding each ↓ST episode, we calculated the following heart rate variability (HRV) indices; the mean RR interval (RR5), the standard deviation of all RR intervals (SD Index5), the corresponding coefficient of variation (CV5), and the natural log (Ln) of the spectral components, total power at 0.000 to 0.400 Hz (TP5), low frequency power at 0.040 to 0.150 Hz (LF5), high frequency power at 0.150 to 0.400 Hz (HF5), and the ratio of the low to high frequency power (LF5/HF5). As HRV indices of the 24-hour period, we calculated the respective RR, SD Index, CV, LnTP, LnLF, LnHF, and Ln LF/HF. RR5, SD Index5, CV5, and LnTP5 were all significantly lower than RR (t =−5.343, p = 3.7 × 10−7 ), SD Index (t =−19.091, p = 1.99 × 10−40 ), CV(t -15.780, p = 1.28 × 10−32 ), and LnTP (t =−3.210, p = 0.0016), respectively. LnHF5 was inversely correlated with the magnitude of the ↓ST; r =−0.174, P < 0.05, and CV5 was inversely correlated with the natural log (Ln) of the ischemic event duration; r =−0.183, P < 0.05. Analogous results were obtained for both the painful and silent ↓ST episodes. It is concluded that HRV is decreased during the 5-minute period preceding ↓ST episodes, and is inversely related with the magnitude and the duration of the ↓ST. 相似文献
1