Abstract 1357: Mobility of Epicardial Rotors During Human Ventricular Fibrillation

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Martyn P Nash ◽  
Ayman Mourad ◽  
Chris P Bradley ◽  
David J Paterson ◽  
Peter M Sutton ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Cardiac Surgery ◽  
Aortic Valve Disease ◽  
Singularity Analysis ◽  
Epicardial Mapping ◽  
Voltage Versus ◽  
Phase Singularity ◽  
The Mean ◽  
Artery Disease ◽  
Contact Electrodes

Introduction: Stability of reentry during VF may depend on the dynamics of rotor cores. We determined the mobility of rotors during human VF using global epicardial mapping and phase singularity analysis. Methods: In 10 patients undergoing cardiac surgery (6 with coronary artery disease; 4 with aortic valve disease), VF was induced by burst pacing prior to (n=7) or immediately following (n=3) the onset of cardiopulmonary bypass. For each subject, a 20 – 40 s episode of fibrillatory activity was sampled at 1 kHz using an epicardial sock containing 256 unipolar contact electrodes connected to a UnEmap system. Trajectories of persistent epicardial rotors (singularities of phase maps, based on de-trended voltage versus its Hilbert transform, lasting for > 1000 ms) were tracked. The mean core location was determined across the lifetime of each persistent rotor. The rotor was classified as stationary if its core remained within 15 mm of the mean location for more than 90% of its duration. Results: Using the above criteria, the numbers of mobile and stationary rotors varied from patient-to-patient (see figure ). In all but one patient, there were more mobile than stationary rotors. Over all patients, the mean ± SD number of mobile rotors (32 ± 21) was significantly greater than stationary rotors (7 ± 6, P<0.01). Conclusions: At least one stationary rotor was always present during human VF, but it is predominantly characterised by a small number of persistent mobile rotors.

Abstract 1356: Is Human Ventricular Fibrillation Different From Experimental Models?

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Martyn P Nash ◽  
Ayman Mourad ◽  
Chris P Bradley ◽  
David J Paterson ◽  
Richard H Clayton ◽  
...  
Keyword(s):  
Cardiac Surgery ◽  
Ventricular Fibrillation ◽  
Phase Plane ◽  
Experimental Models ◽  
Epicardial Mapping ◽  
Voltage Versus ◽  
Wavefront Analysis ◽  
Phase Singularities ◽  
Contact Electrodes ◽  
Zero Phase

Introduction: There is a paucity of data on wavefront dynamics during human VF. Some experimental models show multiple small wavelets, whilst others implicate a single stationary rotor. We have studied human VF using phase and wavefront analysis based on global epicardial mapping. Methods: VF was induced by burst pacing in 10 patients undergoing routine cardiac surgery. For each subject, a 20 – 40 s episode of VF activity was sampled at 1 kHz using an epicardial sock containing 256 unipolar contact electrodes connected to a UnEmap system. Wavefronts were determined from the phase plane (based on de-trended voltage versus its Hilbert transform) using an active-edge algorithm to track the isolines of zero phase. Wavefront sizes and rotor statistics were tallied across all patients. Results: As illustrated, one or more wavefronts of at least 10 cm in size were present for 90% of the VF duration. Insert shows a polar projection of wavefronts between pairs of phase singularities. Large convoluted wavefronts were predominant with at least one wavefront of size > 20 cm present for over half of the VF duration. Persistent epicardial rotors (defined as those with lifetimes greater than 1000 ms, or approximately 5 rotations) were present for more than 78% of the total VF duration, whilst two or more persistent rotors were present more than half of the time. Conclusion: Epicardial mapping in humans suggests that neither multiple wavelets nor a single persistent stationary rotor, as seen in experimental models, drive VF. Instead, in all subjects the predominant characteristic was multiple mobile rotors of moderate duration (1000 –7000 ms), which generated large make and break wavefronts.

scholarly journals Impact of comprehensive management on clinical outcomes in hypertensive patients with coronary artery disease: HIJ-CREATE sub-study

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
H Ogawa ◽  
H Sekiguchi ◽  
K Jujo ◽  
E Kawada-Watanabe ◽  
H Arashi ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Primary Outcome ◽  
Ldl Cholesterol ◽  
Lipid Lowering ◽  
Hypertensive Patients ◽  
Mean Values ◽  
Comprehensive Management ◽  
The Mean ◽  
Artery Disease

Abstract Background There are limited data on the effects of blood pressure (BP) control and lipid lowering in secondary prevention of coronary artery disease (CAD) patients. We report a secondary analysis of the effects of BP control and lipid management in participants of the HIJ-CREATE, a prospective randomized trial. Methods HIJ-CREATE was a multicenter, prospective, randomized, controlled trial that compared the effects of candesartan-based therapy with those of non-ARB-based standard therapy on major adverse cardiac events (MACE; a composite of cardiovascular death, non-fatal myocardial infarction, unstable angina, heart failure, stroke, and other cardiovascular events requiring hospitalization) in 2,049 hypertensive patients with angiographically documented CAD. In both groups, titration of antihypertensive agents was performed to reach the target BP of &lt;130/85 mmHg. The primary endpoint was the time to first MACE. Incidence of endpoint events in addition to biochemistry tests and office BP was determined during the scheduled 6, 12, 24, 36, 48, and 60-month visits. Achieved systolic BP and LDL-Cholesterol (LDL-C) level were defined as the mean values of these measurements in patients who did not develop MACEs and as the mean values of them prior to MACEs in those who developed MACEs during follow-up. Results During a median follow-up of 4.2 years (follow-up rate of 99.6%), the primary outcome occurred in 304 patients (30.3%). Among HIJ-CREATE participants, 905 (44.2%) were prescribed statins on enrollment. Kaplan–Meier curves for the primary outcome revealed that there was no relationship between statin therapy and MACEs in hypertensive patients with CAD. The original HIJ-CREATE population was divided into 9 groups based on equal tertiles based on mean achieved BP and LDL-C during follow-up. For the analysis of subgroups, estimates of relative risk and the associated 95% CIs were generated with a Cox proportional-hazards model (Figure 1). The relation between LDL cholesterol level and hazard ratios for MACEs was nonlinear, with a significant increase of MACEs only in the patients with inadequate controlled LDL-C level even in the patients with tightly controlled BP. Conclusions The results of the post-hoc analysis of the HIJ-CREATE suggest that clinicians should pay careful attention to conduct comprehensive management of lipid lowering even in the contemporary BP lowering for the secondary prevention in hypertensive patients with CAD. Figure 1 Funding Acknowledgement Type of funding source: None

scholarly journals The impact of vildagliptin on the daily glucose profile and coronary plaque stability in impaired glucose tolerance patients with coronary artery disease: VOGUE—A multicenter randomized controlled trial

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hiroyuki Yamamoto ◽  
Akihide Konishi ◽  
Toshiro Shinke ◽  
Hiromasa Otake ◽  
Masaru Kuroda ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Controlled Trial ◽  
Control Group ◽  
Randomized Controlled ◽  
Fibrous Cap ◽  
Multicenter Randomized Controlled Trial ◽  
The Mean ◽  
Artery Disease ◽  
Fibrous Cap Thickness ◽  
The Impact

Abstract Background The impact of reduction in glycemic excursion on coronary plaques remains unknown. This study aimed to elucidate whether a dipeptidyl peptidase 4 inhibitor could reduce the glycemic excursion and stabilize the coronary plaques compared with conventional management in coronary artery disease (CAD) patients with impaired glucose tolerance (IGT). Methods This was a multicenter, randomized controlled trial including CAD patients with IGT under lipid-lowering therapy receiving either vildagliptin (50 mg once a day) or no medication (control group) regarding glycemic treatment. The primary endpoint was changes in the minimum fibrous cap thickness and lipid arc in non-significant native coronary plaques detected by optical coherence tomography at 6 months after intervention. Glycemic variability expressed as the mean amplitude of glycemic excursion (MAGE) measured with a continuous glucose monitoring system was evaluated before and 6 months after intervention. Results A total of 20 participants with 47 lesions were allocated to either the vildagliptin group (10 participants, 22 lesions) or the control group (10 participants, 25 lesions). The adjusted difference of mean changes between the groups was − 18.8 mg/dl (95% confidence interval, − 30.8 to − 6.8) (p = 0.0064) for the MAGE (vildagliptin, − 20.1 ± 18.0 mg/dl vs. control, 2.6 ± 12.7 mg/dl), − 22.8° (− 40.6° to − 5.1°) (p = 0.0012) for the mean lipid arc (vildagliptin, − 9.0° ± 25.5° vs. control, 15.8° ± 16.8°), and 42.7 μm (15.3 to 70.1 μm) (p = 0.0022) for the minimum fibrous cap thickness (vildagliptin, 35.7 ± 50.8 μm vs. control, − 15.1 ± 25.2 μm). Conclusions Vildagliptin could reduce the MAGE at 6 months and may be associated with the decreased lipid arc and increased minimum FCT of the coronary plaques in CAD patients with IGT as compared with the control group. These findings may represent its potential stabilization effect on coronary plaques, which are characteristic in this patient subset. Trial registration Registered in the UMIN clinical trial registry (UMIN000008620), Name of the registry: VOGUE trial, Date of registration: Aug 6, 2012, URL: https://upload.umin.ac.jp/cgi-open-bin/ctr/ctr_view.cgi?recptno=R000010058

Comparison of the ATRIA, CHA2DS2-VASc, and Modified Scores ATRIA-HSV, CHA2DS2-VASc-HS, for the Prediction of Coronary Artery Disease Severity

Angiology ◽  
2021 ◽  
pp. 000331972199141
Author(s):  
Arafat Yildirim ◽  
Mehmet Kucukosmanoglu ◽  
Fethi Yavuz ◽  
Nermin Yildiz Koyunsever ◽  
Yusuf Cekici ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Vascular Disease ◽  
Operating Characteristics ◽  
Coronary Artery Disease Severity ◽  
Group 3 ◽  
The Mean ◽  
Group 2 ◽  
Artery Disease ◽  
Group 1

Many parameters included in the Anticoagulation and Risk Factors in Atrial Fibrillation (ATRIA) and CHA2DS2-VASc (congestive heart failure, hypertension, age ≥75 years, diabetes mellitus, stroke, vascular disease, age 65-74 years, sex category) scores also predict coronary artery disease (CAD). We modified the ATRIA score (ATRIA-HSV) by adding hyperlipidemia, smoking, and vascular disease and also male sex instead of female. We evaluated whether the CHA2DS2-VASc, CHA2DS2-VASc-HS, ATRIA, and ATRIA-HSV scores predict severe CAD. Consecutive patients with coronary angiography were prospectively included. A ≥50% stenosis in ≥1epicardial coronary artery (CA) was defined as severe CAD. Patient with normal CA (n = 210) were defined as group 1, with <50% CA stenosis (n = 178) as group 2, and with ≥50% stenosis (n = 297) as group 3. The mean ATRIA, ATRIA-HSV, CHA2DS2-VASc, and CHA2DS2VASc-HS scores increased from group 1 to group 3. A correlation was found between the Synergy between PCI with Taxus and Cardiac Surgery score and ATRIA ( r = 0.570), ATRIA-HSV ( r = 0.614), CHA2DS2-VASc ( r = 0.428), and CHA2DS2-VASc-HS ( r = 0.500) scores ( Ps < .005). Pairwise comparisons of receiver operating characteristics curves showed that ATRIA-HSV (>3 area under curve [AUC]: 0.874) and ATRIA (>3, AUC: 0.854) have a better performance than CHA2DS2-VASc (>1, AUC: 0.746) and CHA2DS2-VASc-HS (>2, AUC: 0.769). In conclusion, the ATRIA and ATRIA-HSV scores are simple and may be useful to predict severe CAD.

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 Determination of comorbidity index for high-risk patients with coronary artery disease before cardiac surgery

2021 ◽  
Vol 23 (4) ◽  
pp. 485-491
Author(s):  
О. К. Gogayeva
Keyword(s):  
Coronary Artery Disease ◽  
Cardiac Surgery ◽  
High Risk ◽  
Normal Weight ◽  
High Risk Patients ◽  
Type 2 Dm ◽  
Risk Patients ◽  
Comorbidity Index ◽  
Artery Disease

The aim: to determine the comorbidity index before cardiac surgery in high-risk patients with coronary artery disease (CAD). Materials and methods. A retrospective analysis of data from 354 random high-risk patients who underwent a surgery and were discharged from National M. Amosov Institute of Cardiovascular Surgery affiliated to National Academy of Medical Sciences of Ukraine during the period 2009–2019. The mean age of patients was 61.9 ± 9.6 years. All the patients were examined: ECG, ECHO CG, coronary angiography before the surgery as well as Charlson comorbidity index was calculated and a risk on the scales EuroSCORE I, EuroSCORE II and STS was stratified. Results. I–III degree obesity was revealed in 133 (37.5 %) patients, patients with type 2 diabetes mellitus (DM) were more likely to have BMI >30 kg/m2 (P = 0.017). Patients with normal weight had a carotid artery stenosis >50 % (P = 0.014) and history of stroke (P = 0.043) significantly more frequently. No differences in comorbidity of overweight and normal weight patients were detected (5.73 ± 1.70 vs. 5.9 ± 1.8, P = 0.4638). Type 2 DM was diagnosed in 90 (25.4 %) patients. In the case of normoglycemia, the comorbidity index was significantly lower than in type 2 DM (4.88 ± 1.38 vs. 6.60 ± 2.03, P = 0.0001) and glucose intolerance 5.8 ± 1.5 (P < 0.0001). Chronic kidney disease (CKD) G3a–G4 stages was diagnosed in 132 (37.2 %) patients. Significant higher comorbidity was found in patients with G3a–G4 stages CKD in comparison to those with G1–G2 stages CKD – 6.33 ± 1.78 vs. 5.46 ± 1.60 (P < 0.0001). Among comorbidities in patients with gouty arthritis, type 2 DM (P < 0.0001), obesity (P = 0.0080), CKD G3a–G4 (P = 0.0020) and varicose veins of the lower extremities (P = 0.0214) were significantly more common. Preoperative risk stratification according to the EuroSCORE II scale averaged 8.8 %. Conclusions. Preoperative analysis of baseline status in CAD patients showed the high Charlson comorbidity index, which averaged 5.7 ± 1.7. The weak direct correlation between the comorbidity index and the high predicted cardiac risk on the ES II scale (r = 0.2356, P = 0.00001), length of stay in the intensive care unit (r = 0.1182, P = 0.0262) and discharge after the surgery (r = 0.1134, P = 0.0330) was found.

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