QT interval and QT dispersion in endurance athletes and in power athletes using large doses of anabolic steroids

1999 ◽  
Vol 84 (3) ◽  
pp. 364-366 ◽  
Author(s):  
Anu Stolt ◽  
Tuomo Karila ◽  
Matti Viitasalo ◽  
Matti Mäntysaari ◽  
Urho M Kujala ◽  
...  
Keyword(s):  
Qt Interval ◽  
Anabolic Steroids ◽  
Qt Dispersion ◽  
Endurance Athletes

scholarly journals Can indicators of myocardial damage predict carbon monoxide poisoning outcomes?

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hitoshi Koga ◽  
Hideki Tashiro ◽  
Kouta Mukasa ◽  
Tomohiro Inoue ◽  
Aya Okamoto ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Qt Interval ◽  
Troponin I ◽  
Morphological Changes ◽  
Carbon Monoxide Poisoning ◽  
Myocardial Damage ◽  
Qt Dispersion ◽  
Ecg Changes ◽  
Corrected Qt Interval ◽  
Logistic Analysis

Abstract Background Carbon monoxide causes electrical, functional, and morphological changes in the heart. It is unclear, however, whether the indicators of myocardial damage can predict the patient’s prognosis after carbon monoxide poisoning. This retrospective study aimed to investigate the relationship between the carboxyhemoglobin level and electrocardiographic (ECG) changes and whether the ECG changes and troponin I levels are related to the patient’s prognosis after carbon monoxide poisoning. Methods Carboxyhemoglobin, troponin I, and ECG parameters were measured in 70 patients with carbon monoxide poisoning. The QT and RR intervals were measured for each ECG lead in all patients, and the corrected QT interval and corrected QT dispersion were calculated. Results The correlation between the maximum corrected QT interval and the carboxyhemoglobin level was significant (P = 0.0072, R2 = 0.1017), as were the relationships between QT dispersion and carboxyhemoglobin (P < 0.001, R2 = 0.2358) and the corrected QT dispersion and carboxyhemoglobin (P < 0.001, R2 = 0.2613). The multivariate logistic analysis showed that the significant predictors of sequential disability were corrected QT dispersion (P = 0.0042), and troponin I level (P = 0.0021). Conclusions Patients’ prognosis following carbon monoxide poisoning can be predicted based on corrected QT dispersion and the troponin I level. Patients with myocardial damage should be monitored not only for their cardiovascular outcome but also for their neurological outcome and their prognosis.

Adjacent QT dispersion: A good predictor of ventricular arrhythmias after myocardial infarction

Open Medicine ◽  
2008 ◽  
Vol 3 (2) ◽  
pp. 179-182 ◽  
Author(s):  
Mohammad Ostovan ◽  
Shahdad Khosropanah ◽  
Shohreh Hooshmand
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Qt Interval ◽  
Regional Variation ◽  
Ventricular Arrhythmias ◽  
Qt Dispersion ◽  
Maximum Difference ◽  
Simple Method ◽  
Qtc Dispersion ◽  
Surface Electrocardiogram

AbstractThe 12-lead surface electrocardiogram adjacent QTc dispersion, which is the maximum difference of corrected QT interval between two adjacent leads, is a simple method to determine regional variation in repolarization and refractoriness. The aim of this study is to evaluate adjacent QTc dispersion as a marker of susceptibility to ventricular arrhythmias after myocardial infarction. A total of 135 consecutive patients with acute myocardial infarction were enrolled in the study. Adjacent QTc, measured by lens magnifier, was calculated on the first, second and third days after acute myocardial infarction. On the second day after acute myocardial infarction, adjacent QTc dispersion was significantly greater in patients with ventricular arrhythmias (P < 0.001). Adjacent QTc dispersion on the first and fifth day after acute myocardial infarction was not associated with development of ventricular arrhythmias. On the second day after acute myocardial infarction, adjacent QTc dispersion is a simple and feasible method for prediction of ventricular arrhythmias.

scholarly journals Change of the main parameters of 24-hour ekg monitoring in patients with myocardial infarction associated with ventricular arrhythmias

2013 ◽  
Vol 94 (2) ◽  
pp. 176-180
Author(s):  
I V Logacheva ◽  
N G Barantseva
Keyword(s):  
Myocardial Infarction ◽  
Ventricular Arrhythmia ◽  
Qt Interval ◽  
Ventricular Arrhythmias ◽  
Heart Rhythm ◽  
Qt Dispersion ◽  
Heart Rhythm Variability ◽  
Corrected Qt Interval ◽  
Grade 3 ◽  
Q Wave

Aim. To study the change of the main parameters of 24-hour EKG monitoring over time in patients with myocardial infarction associated with ventricular arrhythmias of different grades. Methods. The change of the echocardiography parameters, heart rhythm variability, corrected QT interval duration and dispersion, late ventricular potentials, heart rhythm turbulence were examined in 70 adult men (mean age 52.6±1.3 years) with primary Q-wave myocardial infarction on 10-14th day of the disease and after 6 months. Patients were assigned into 3 groups depending on ventricular arrhythmias severity (according to Lown classification modified by Ryan): А1 (n=29) - grade 1-2, А2 (n=23) - grade 3-4, А3 (n=18) - patients with paroxysmal ventricular tachycardia. Results. Presence of late ventricular potentials and pathologic heart rhythm turbulence in patients in acute period of myocardial infarction suggested high grade of ventricular arrhythmia. Ventricular arrhythmias were associated with severe sympathicotonia, prolongation of corrected QT interval and QT dispersion. 6 months after Q-wave myocardial infarction an autonomic imbalance increased and no positive changes of myocardial homogenicity parameters, late ventricular potentials and pathologic heart rhythm turbulence were observed with increasing ventricular arrhythmia grading and heart rate frequency. A relationship between left ventricle ejection fraction, myocardium mass and myocardial electric non-stability values was revealed. In patients with Q-wave myocardial infarction ventricular arrhythmias are mediated by several mechanisms: systolic and autonomic disorder, repolarization abnormalities, late ventricular potentials pathologic heart rhythm turbulence. The severity of abnormalities is marked by the ventricular arrhythmias grade. Conclusion. 6 months after myocardial infarction (in healing stage) the significant positive changes are found only in patients with 1-2 grades ventricular arrhythmias. The significant non-homogeneity of myocardial electrophysiological features still persists in patients with life-threatening ventricular arrhythmias.

Long QT interval syndrome with increased QT dispersion

1997 ◽  
Vol 41 (4) ◽  
pp. 541-544 ◽  
Author(s):  
D. MICHALOUDIS ◽  
TH. BISHINIOTIS
Keyword(s):  
Qt Interval ◽  
Qt Dispersion ◽  
Long Qt ◽  
Long Qt Interval

scholarly journals A simple modification of dialysate potassium: its impact on plasma potassium concentrations and the electrocardiogram

2019 ◽  
Author(s):  
Pierre Delanaye ◽  
François Krzesinski ◽  
Bernard E Dubois ◽  
Alexandre Delcour ◽  
Sébastien Robinet ◽  
...  
Keyword(s):  
Sudden Death ◽  
Qt Interval ◽  
Lower Risk ◽  
Plasma Potassium ◽  
Qt Dispersion ◽  
Dialysis Session ◽  
Simple Modification ◽  
Before And After ◽  
Electrocardiogram Ecg ◽  
The Impact

Abstract Background Sudden death is frequent in haemodialysis (HD) patients. Both hyperkalaemia and change of plasma potassium (K) concentrations induced by HD could explain this. The impact of increasing dialysate K by 1 mEq/L on plasma K concentrations and electrocardiogram (ECG) results before and after HD sessions was studied. Methods Patients with pre-dialysis K >5.5 mEq/L were excluded. ECG and K measurements were obtained before and after the first session of the week for 2 weeks. Then, K in the dialysate was increased (from 1 or 3 to 2 or 4 mEq/L, respectively). Blood and ECG measurements were repeated after 2 weeks of this change. Results Twenty-seven prevalent HD patients were included. As expected, a significant decrease in K concentrations was observed after the dialysis session, but this decrease was significantly lower after the switch to an increased dialysate K. The pre-dialysis K concentrations were not different after changing, but post-dialysis K concentrations were higher after switching (P < 0.0001), with a lower incidence of post-dialysis hypokalaemia. Regarding ECG, before switching, the QT interval (QT) dispersion increased during the session, whereas no difference was observed after switching. One week after switching, post-dialysis QT dispersion [38 (34–42) ms] was lower than post-dialysis QT dispersion 2 weeks and 1 week before switching [42 (38–57) ms, P = 0.0004; and 40 (35–50) ms, P = 0.0002]. Conclusions A simple increase of 1 mEq/L of K in the dialysate is associated with a lower risk of hypokalaemia and a lower QT dispersion after the dialysis session. Further study is needed to determine if such a strategy is associated with a lower risk of sudden death.

scholarly journals QT dispersion and components of the QT interval in ischaemia and infarction.

Heart ◽  
1995 ◽  
Vol 73 (1) ◽  
pp. 32-36 ◽  
Author(s):  
P. D. Higham ◽  
S. S. Furniss ◽  
R. W. Campbell
Keyword(s):  
Qt Interval ◽  
Qt Dispersion
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