Humans ; Tomography, Optical Coherence

Objective To evaluate the clinical safety and feasibility of dual-axis rotational coronary angiography (XperSwing) in diagnosing coronary artery disease in aged Chinese patients through comparing it with standard coronary angiography. Methods During the period from April 2011 to December 2012, a total of consecutive 151 patients with an age ≥ 65 years underwent diagnostic coronary angiography at authors’ hospital. The patients were randomly divided into the standard angiography group (n = 75) and XperSwing group (n = 76). The used dose of contrast, radiation exposure dose and operation time of each patient were recorded. Besides, the occurrence of procedure-related symptoms and arrhythmia during the procedure was recorded, and the blood pressure (BP), heart rate (HR) and creatinine level immediately before-and-after the procedure were estimated. The number of additional acquisition needed to be performed was used to evaluate the efficacy of the two methods. Results Coronary angiography was successfully accomplished in all patients of the two groups, and no significant difference in the number of additional acquisition existed between the two groups (P > 0.05). The used dose of contrast in XperSwing group was reduced by 44% when compared with that in the standard angiography group, i.e. (29.28 ± 5.06) ml vs(22 755.97 ± 11 239.22) mGycm2, (P<0.001). No statistically significant differences in the occurrence of procedure-related symptoms and arrhythmia during the procedure, in the operation time as well as in the postoperative changes of BP and HR existed between the two groups (P > 0.05). No contrast- induced nephropathy occurred in both groups, although the difference in postoperative changes of creatinine level between the two groups was statistically significant (P < 0.05). Conclusion This study indicates that in diagnosing coronary artery disease in aged Chinese patients, dual-axis rotational coronary angiography is more safe and effective than conventional coronary angiography, as XperSwing can significantly reduce the contrast dose and radiation exposure for the patients.

Objective To compare radiation doses to patients between rotational angiography and standard angiography.Methods According to different modes,our experiment was divided into RA (Dual-axis Rotational Angiography) group and SA (Standard Angiography) group.The latter was divided into 3 subgroups (SA1,SA2 and SA3) in terms of different time of cine.The procedure time and the position were controlled by the order preset into the machine.Each group consisted of 10 repeated operations with a unique phantom to simulate the true patients.The radiation doses were measured by using dose meter provided by the machine and TLD system; the means of the data were compared.Results The mean of total accumulated DAP and AK in group RA were 3 061.6 mGy·cm2 and 64.2 mGy,respectively,compared with group SA1 (4 213.9 mGy·cm2 and 85.5 mGy),SA2 (6 436.0 mGy·cm2 and 112.2 mGy),SA3 (12 810.4 mGy·cm2 and 243.7 mGy).The mean of accumulated dose in group RA was 37.70 mGy,higher than group SA1 (26.56 mGy) but lower than group SA2 (46.86 mGy) and SA3 (77.79 mGy).The gap between highest dose and lowest dose in RA group was insignificant whereas significant in the subgroups of SA.Conclusions In comparison with conventional angiography,the dual-axis rotational angiography has the potential to reduce radiation exposure of patients significantly so as to prevent skin radiation injures.

Objective To observe the clinical safety of dual axis rotational coronary angiography (DARCA) in the diagnosis of coronary artery disease in Chinese population.Methods From March to December in 2010,74 patients undergoing diagnostic DARCA were enrolled.The improved isocentering technique was adopted in 34 of the patients at the end of the study during DARCA.Blood pressure,heart rate and symptoms were recorded immediately before-and-after contrast injections.Contrast dose,radiation exposure and procedure time for DARCA were recorded.Continuous variable data were analyzed using Student＇s t test,if normality assumption was violated,rank sum test would be used.Categorical variables were analyzed using x2 test.Results ( 1 ) Clinical safety:There was no chest pain documented during or immediately post-injection for all patients.Only 1 patient ( 1 ％ ) had an attack of ventricular tachycardia immediately after the contrast injection and then relieved automatically.Pre and post-injection systolic blood pressure values of left coronary artery were statistically different [ ( 116 ± 20 ) mm Hg vs.( 111 + 18) mm Hg( 1 mm Hg =0.133 kPa),t =3.303,P =0.001 ],and heart rates differed,too [ 73 ( 65- 84)bpm vs.71(64-78) bpm,Z =-4.789,P =0.001 ],but that imposed no clinical significance.(2)Contrast dose,radiation dose and procedure time:The mean contrast utilization,radiation dose and procedure time for DARCA were 28 (25-34) ml,8979 ( 6733-12 363 ) mGycm2 and 200 (164-270) s.Compared with conventional DARCA,improved isocentering technique during DARCA had less radiation exposure and procedure time in left coronary artery angiography and the whole coronary artery angiography [ left coronary artery angiographic radiation exposure:4004 (2932-5772) mGycm2 vs.5808 (4798- 8838) mGycm2,Z =-3.471,P =0.001 ;total radiation exposure:(8116 +2493) mGycm2 vs.( 11 371 ±4122) mGycm2,t =-4.176,P =0.001 ; left coronary artery angiographic procedure time:120 ( 80-180)s vs.150(126-214) s,Z =- 2.836,P =0.005; total procedure time:180 (139-240) s vs.220( 186-308 )s,Z =-3.004,P =0.003 ],but there was no statistically difference in contrast utilization [30(25-35) ml vs.27(25-34)ml,Z=-0.906,P=0.365].Conclusion This study demonstrates clinical safety of DARCA in the diagnosis of coronary artery disease in Chinese population.Compared with conventional isocentering technique of DARCA,improved isocentering technique can significantly reduce radiation exposure and procedure time on the basis of simplified operation,and replace the conventional isocentering technique,but randomized double-blind controlled studies should be conducted.

Objective:To analyze the accuracy of a single-lead electrocardiogram (iECG) algorithm based on intelligent wristwatch in identifying sinus tachycardia and atrial fibrillation (AF) with rapid ventricular rate.Methods:In this non-randomized control trial, 642 patients aged ≥18 years were enrolled in the General Hospital of Chinese PLA between December 15, 2020 and May 30, 2022, with sinus tachycardia or rapid ventricular rate of AF (ranging from 111 to 145 beats/min for sinus tachycardia, from 110 to 150 beats/min for rapid ventricular rate of AF, respectively). The patients wore Huawei Watch GT2 Pro smartwatches on their left wrists, and the physiological signals detected by the smartwatches in a relaxed state were used as the measured data. The iECG algorithm developed by Huawei was used for identification. Simultaneously, 12-lead electrocardiograms (12L-ECG) were performed, and two cardiologists served as the gold standard for interpretation. Three participants who did not meet the inclusion criteria were excluded based on the detection results, and a total of 639 participants were included in the study. The accuracy of the algorithm in identifying sinus tachycardia and rapid ventricular rate AF was evaluated using metrics such as recall rate, precision rate, macro F1 score for multi-class classification.Results:Among 639 subjects, there were 469 males and 170 females. There were 389 cases of sinus tachycardia and 250 cases of rapid ventricular rate AF, with a mean age of (46.53±13.32) years. The recall rate, precision rate, and F1 value of iECG algorithm in identifying sinus tachycardia was 98.7%, 99.2% and 99.0%, respectively, while it was 98.8%, 98.0% and 98.4%, respectively for AF with rapid ventricular rate. The macro F1 of AF with rapid ventricular rate and sinus tachycardia was 98.7%. The iECG based on the intelligent wristwatch showed good consistency with the corresponding 12L-ECG waveforms.Conclusion:The intelligent wristwatch-based iECG algorithm can effectively identify sinus tachycardia and rapid ventricular rate AF, demonstrating good accuracy.

Objectives:To compare the efficacy of the combination of excimer laser coronary angioplasty(ELCA)and drug-coated balloon(DCB)for in-stent restenosis(ISR)and to evaluate the impact of neointimal tissue characteristics on treatment outcomes. Methods:A total of 96 ISR lesions from 86 patients who underwent optical coherence tomography(OCT)evaluation and DCB with or without ELCA treatment at The First Medical Center of Chinese PLA General Hospital from January 2019 to May 2023 were retrospectively analyzed.ISR lesions were divided into ELCA+DCB group(n=30)and DCB group(n=66).Additionally,ISR lesions were classified as homogeneous and non-heterogeneous patterns based on the OCT characteristics of the neointimal tissue,and the impact on acute lumen gains was compared between different ISR patterns.Acute lumen gain(ΔMLA)was defined as the changes in minimum lumen area before and after the intervention. Results:The ELCA+DCB group had a significantly greater ΔMLA than the DCB group([3.2±0.8]mm2 vs.[2.6±1.4]mm2,P=0.015).Among the ISR with a homogeneous pattern,the ΔMLA of the ELCA+DCB group was significantly greater than that of the DCB group([3.0±0.9]mm2 vs.[2.2±1.1]mm2,P=0.030).There was no significant difference in ΔMLA between the two ISR groups with the non-homogeneous pattern([3.4±0.7]mm2 vs.[3.2±1.5]mm2,P=0.533).There was no death,the rate of target lesion revascularization was similar between the patients with lesions receiving DCB treatment and patients receiving ELCA +DCB treatment(7.4%vs.4.2%,P＞0.05). Conclusions:The combination of ELCA and DCB is an effective strategy for treating ISR,which can achieve greater acute lumen gain compared to DCB treatment alone,especially for the treatment of homogenous ISR pattern characterized by OCT.

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia. Early diagnosis and effective management are important to reduce atrial fibrillation-related adverse events. Photoplethysmography (PPG) is often used to assist wearables for continuous electrocardiograph monitoring, which shows its unique value. The development of PPG has provided an innovative solution to AF management. Serial studies of mobile health technology for improving screening and optimized integrated care in atrial fibrillation have explored the application of PPG in screening, diagnosing, early warning, and integrated management in patients with AF. This review summarizes the latest progress of PPG analysis based on artificial intelligence technology and mobile health in AF field in recent years, as well as the limitations of current research and the focus of future research.
Humans ; Atrial Fibrillation/therapy* ; Photoplethysmography ; Artificial Intelligence ; Electrocardiography ; Biomedical Technology