Contribution of the peak exercise QT dispersion to the accuracy of an exercise test during the evaluation of coronary artery disease

2000 ◽  
Vol 55 (6) ◽  
pp. 335-339 ◽  
Author(s):  
Mehmet ÜLGEN ◽  
Aziz KARADEDE ◽  
Sait ALAN ◽  
A. Vahip TEMAMOĞULARI ◽  
Aziz KARABULUT ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Exercise Test ◽  
Qt Dispersion ◽  
Peak Exercise ◽  
Artery Disease

scholarly journals Peak exercise capacity prediction from a submaximal exercise test in coronary artery disease patients

2013 ◽  
Vol 4 ◽  
Author(s):  
Arto J. Hautala ◽  
Antti M. Kiviniemi ◽  
Jaana J. Karjalainen ◽  
Olli-Pekka Piira ◽  
Samuli Lepojärvi ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Exercise Capacity ◽  
Exercise Test ◽  
Submaximal Exercise ◽  
Peak Exercise ◽  
Submaximal Exercise Test ◽  
Artery Disease ◽  
Capacity Prediction

Effects of Atrial Pacing on QT Dispersion in Patients with Coronary Artery Disease Without Angina Pectoris and ST Segment Depression

Angiology ◽  
2001 ◽  
Vol 52 (6) ◽  
pp. 393-398
Author(s):  
Ahmet Duran Demir ◽  
Kubilay Senen ◽  
Yücel Balbay ◽  
Mustafa Soylu ◽  
Hakan Tikiz ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Angina Pectoris ◽  
Qt Dispersion ◽  
Atrial Pacing ◽  
St Segment ◽  
Artery Disease

scholarly journals Prolonged QTc Dispersion Correlates with Coronary Artery Disease in Acute ST Elevated Myocardial Infarction (STEMI)

2013 ◽  
Vol 5 (2) ◽  
pp. 173-181 ◽  
Author(s):  
NI Sharafat ◽  
M Khalequzzaman ◽  
M Akhtaruzzaman ◽  
AK Choudhury ◽  
S Hasem ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Qt Dispersion ◽  
Qtc Dispersion ◽  
Group I ◽  
The Mean ◽  
Group Ii ◽  
Artery Disease ◽  
Vessel Score ◽  
Vessel Involvement

Background: It has been found that there is strong association of QT dispersion and QT dispersion ratio with extent and severity of coronary artery disease. Qualitative importance of QTc dispersion on the base line ECG in patients with MI is recognized clinically but quantification of this phenomenon is less commonly used in clinical practice, which might be a better independent risk predictor of this group of patients. Methods: A total of 100 patients were selected, Study populations sub-divided into two groups on the basis of QTc dispersion. In group I (comparison group): QTc dispersion is <60 milliseconds (msec) in group II (study group) : QTc dispersion e”60milliseconds(msec). 50 patients in each group. QT dispersion was calculated on standard resting 12 lead ECGs. QT interval was measured from the beginning of the inscription of the QRS complex to the point at which the T wave returned to the isoelectric line. Angiographic severity of coronary artery disease was assessed by- Vessel score, Friesinger score and Leaman score. Interpretation of coronary angiogram was reviewed by at least two cardiologists. . Results: The mean vessel score for group I patients was 1.16±0.68 and that of group II patients was 2.30±0.64 and the mean difference was statistically significant (p<0.05). Patients those had single vessel involvement had mean QTc dispersion 57.05, patients those had double vessel disease mean QTc dispersion was 102.00 and patients those had triple vessel involvement had mean QTc dispersion 177.60. There was a strong positive correlation with the QTc dispersion and increasing number of vessel involvement (Pearson’s correlation coefficient). The mean Friesinger score for group I patients was 4.84±2.56 and that of group II patients was 9.80±2.60. The mean difference was significantly (p<0.05) higher in group II patients. There was a strong positive correlation between the QTc dispersion and Leaman score (Pearson’s correlation coefficient). In group I patients 56% had insignificant coronary artery disease and 44% had significant coronary artery disease defined by Friesinger index (n=100). In group II patients 6% had Insignificant coronary artery disease & had 94% significant coronary artery disease. Conclusion: QTc dispersion>60 ms had independent predictive value for the severity of coronary artery disease. The greater the QTc dispersion the higher the number of coronary artery involvement. We observed that there is a positive correlation between prolonged QT dispersion and coronary artery disease severity in terms of Vessel score, Friesinger score, Leaman score. DOI: http://dx.doi.org/10.3329/cardio.v5i2.14322 Cardiovasc. j. 2013; 5(2): 173-181

scholarly journals QT dispersion increases with low glomerular filtration rate in patients with coronary artery disease

1969 ◽  
Vol 30 (2) ◽  
Author(s):  
Murat CELIK ◽  
Turgay CELIK ◽  
Uygar Cagdas YUKSEL ◽  
Emre YALCINKAYA ◽  
Yalcin GOKOGLAN ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Glomerular Filtration Rate ◽  
Coronary Artery ◽  
Glomerular Filtration ◽  
Filtration Rate ◽  
Qt Dispersion ◽  
Artery Disease

scholarly journals Utility of ST/HR slope and modified ST/HR score for prediction of coronary artery disease in standard treadmill exercise test

1987 ◽  
Vol 76 (3) ◽  
pp. 357-364
Author(s):  
Kyoko KETA ◽  
Iwao SATO ◽  
Hiroshi TAKAKI ◽  
Kazuo HAZE ◽  
Kenji UESHIMA ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Exercise Test ◽  
Treadmill Exercise ◽  
Treadmill Exercise Test ◽  
Artery Disease

Abstract 14283: Coronary Microvascular Function is Correlated With Peak Exercise Capacity in Patients With Unexplained Cardiac Exertion Symptoms and Non-obstructive Coronary Artery Disease

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Ali Ahmad ◽  
Michel Corban ◽  
Takumi Toya ◽  
Frederik H Verbrugge ◽  
Jaskanwal D Sara ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Cardiac Output ◽  
Coronary Artery ◽  
Exercise Capacity ◽  
Obstructive Coronary Artery Disease ◽  
Microvascular Function ◽  
Peak Exercise ◽  
Artery Disease ◽  
Response To Exercise ◽  
Coronary Microvascular Function

Introduction: Coronary microvascular dysfunction (CMD) is prevalent in symptomatic patients with no obstructive coronary artery disease. We postulated that exercise capacity and cardiac output augmentation in response to exercise are linked to coronary microvascular function in this patient population. Methods: Fifty-one consecutive patients with unexplained cardiac exertion symptoms, non-obstructive coronary artery disease on angiography (<50% stenosis), and normal left ventricular ejection fraction (>50%) who underwent concurrent clinically indicated coronary reactivity testing and invasive cardiopulmonary exercise testing (CPEX) were included. Microvascular function was assessed by coronary flow reserve (CFR; hyperemic/resting flow) in response to intracoronary adenosine injection. Cardiac output (CO) was calculated at rest and peak exercise using Fick’s formula. CO limitation was defined as a measured (peak CO - resting CO) <80% than the expected [6*absolute ΔVO 2 (Peak VO 2 -Rest VO 2 ) increase in CO in L/min]. The relationship between CFR, maximal exercise capacity, and CO augmentation at peak exercise was explored. Results: Patients were 56.6±10.5 years old and 73% were females. CFR had a modest positive correlation with measured increase in CO (r=0.42; P=0.003) ( Fig 1A ), and with maximal ergometric exercise capacity [in Watts/Kg] (Pearson’s r=0.33, P=0.02) ( Fig 1B ). Patients with, vs. without impaired cardiac limitations during exercise, had significantly lower CFR levels (2.6±0.5 vs 3.1±0.7; P=0.01) ( Fig 2 ). Conclusion: Impaired coronary microvascular function is associated with lower peak exercise capacity and reduced cardiac output augmentation in response to exercise, underscoring the functional ramification of CMD in symptomatic patients.

Simple heart rate and QT parameters during stress exercise testing to assess presence and severity of stable coronary artery disease

2021 ◽  
Author(s):  
Murugaiyan Rajarajan ◽  
Mugula Sudhakar Rao ◽  
Padmakumar Ramachandran ◽  
Ashwal A Jayaram
Keyword(s):  
Coronary Artery Disease ◽  
Heart Rate ◽  
Coronary Artery ◽  
Heart Rate Recovery ◽  
Stable Coronary Artery Disease ◽  
Peak Exercise ◽  
P Value ◽  
Characteristic Analysis ◽  
Qt Variability ◽  
Artery Disease

Aim: The relationship between QT prolongation and myocardial ischemia is well known, however not many studies have correlated corrected QT interval and heart rate recovery with the severity of coronary artery disease (CAD). Methods: This was a single-center, prospective, observational study which included 127 patients with CAD and 124 patients without CAD. Results: Corrected QT variability from peak to recovery correlated well with CAD with a p value of 0.03. Receiver operative characteristic analysis did not show any significant diagnostic accuracy with any heart rate or QT parameters for predicting the presence or severity of CAD. Conclusion: Coronary artery disease is predicted by reduced ability of the heart rate to rise from rest to peak exercise and reduced recovery of heart rate and corrected QT from peak exercise to recovery at 1 min.

Sign in / Sign up

Export Citation Format

Share Document