Overloaded exercise may increase cardiac load, aggravate to myocardial fibrosis in the long run, and form the substrate of arrhythmias.  This review mainly discusses the relationship between exercise and arrhythmia, and the mechanism of exercise-induced arrhythmias.

 

 

 of a disease). This paper mainly investigates the etiology of different types of syncope (cardiogenic syncope, reflex syncope and nervous system syncope) in elderly population so as to provide 

references for the risk evaluation, diagnosis and treatment strategy selection of syncope.

 

electrocardiographic manifestations of COVID-19 in order to guide the monitoring, evaluation and prognosis judgment of COVID-19.

 

diagnose and treat acute cardiovascular diseases rapidly in a mobile cabin hospital. Based on the clinical practice in the Shanghai mobile cabin hospital, this paper suggests an ECG examination as soon as possible for the patients with suspected acute cardiovascular diseases in mobile cabin hospitals before making preliminary judgment, and formulates a corresponding operating process. 

 

 

 

 with extended front periods, the characteristic point set moves to the right; with extended back periods, the characteristic point set moves upwards; with extended front and back periods, the characteristic point set moves to the upper right.  

 The drifting law of the difference scatter plot is as follows: 

with extended front periods, the characteristic point set moves to the left; with extended back periods, the characteristic point set moves upwards; with extended middle periods, the characteristic point set moves to the bottom right.  

 

 The appearance of long period complicates the original scatter plot of arrhythmia, and the scatter point drifting method serves as a “secret weapon” to 

analyze these cases.

MVP ECG risk score in patients with paroxysmal atrial fibrillation (PAF). MethodsSeventy patients with PAF(PAF group) and 83 subjects without atrial fibrillation (non-PAF group) were selected while 63 healthy subjects who had taken physical examination were enrolled as control group. The three groups of research subjects all underwent  routine 12-lead synchronous ECG exami-nation. P-wave morphology and duration in inferior wall leads, and P-wave voltage in lead Ⅰ were measured and analyzed. MVP scores were compared between the PAF group and non-PAF group. ROC curve analysis was used to determine the critical value of MVP score in predicting PAF. Results(ⅰ) Compared with the non-PAF group, the age and the left atrium diameter (LAD) values of patients in the PAF group significantly increased  \[age: (53.40±11.57) years old vs. (62.70±10.70) years old, P＜0.01; LAD: (36.90±4.50) mm vs. (41.80±5.73) mm, P＜0.01\] while left ventricular ejection fraction  values of the PAF group decreased significantly \[(65.20±5.40)% vs. (61.70±11.77)%, P<0.01\]. Other clinical indexes do not vary significantly between the PAF group and  non-PAF group (P＞0.05). (ⅱ) The MVP scores in the PAF group are significantly higher than those in the non-PAF group in the same age subgroup of ≤ and ＞ 60 years old [≤60 years old: (2.40±1.07) scores vs. (1.80±0.58) scores, P＜0.05; ＞60 years old: (2.30±0.82) scores vs. (1.70±0.56) scores, P＜0.05］. (ⅲ) The area under curve of MVP scores for PAF prediction is 0.65 (P<0.05). When MVP score of 2.5 is taken as the critical value, its sensitivity and specificity in predicting PAF are separately 35.7% and 97.3%. ConclusionThe MVP score of patients with PAF is significantly increased, and the MVP score of 2.5 may be of certain value in predicting the onset of PAF.

 

 

 

 

students and improve their academic performance, which is worthy of being further popularized.

 

 precordial leads of  

  routine 12-lead ECG. MethodsRetrospective analysis was performed on 131 patients examined by routine 12-lead ECG and  diagnosed with  low voltage

 in precordial leads  

  during hospitalization. We observed their clinical characteristics. Results

Among the 131 patients, there are 65 cases (49.62%) with 

 low voltage in all precordial leads, and 52 cases (39.69%) with 

 low voltage in all limb leads. Coronary heart disease complicated by cardiac insufficiency is the most common underlying disease (26 cases, 

 accounting for 

19.85%), followed by malignant tumor (23 cases, accounting for  17.56%) among which lung cancer accounts for the largest proportion (9 cases, accounting for 6.87%). A total of 45 cases (34.35%) are accompanied with anemia and 40 cases (30.53%) are complicated by hypoproteinemia. The average level of blood hemoglobin and blood albumin are both below the normal range. ConclusionCoronary heart disease complicating cardiac insufficiency is the most common underlying disease of patients with low QRS voltage in precordial leads of routine 12-lead ECG, and most of these patients have complications affecting QRS voltage.