Paradoxical atrioventricular block within the bundle of His]

We have been able to record an atrio-ventricular block dependent upon bradycardia, but also no tachycardia, in a patient of 76 who presented with syncopal attacks. The basal electrocardiogram showed no significant delay in atrio-ventricular or intraventricular conduction. Intracavitary electrophysiological investigation allowed us to localise the site of this block in the main trunk of the bundle of His; we also established, under basal conduction conditions, a first degree block with an exactly similar relationship to the duration of the preceding diastole.     

A method of processing information on cineangiography of the right ventricle

This paper describes our experience in making a programme for computer processing of biplane right ventricular cineangiography for the measurement of volumes and analysis of wall motion. The volumes were determined by a method of integration to the geometric model of a triangular pyramid i.e. trunco-pyramidal (IM.TP). The classical ellipsoidal integration method i.e. trunco-conal (IM.TC) and biplane and monoplane planimetry based on the model of a triangular pyramid (PM.TP) were used as references. Nineteen post-mortem RV casts were used to validate the programme. The correlations between the true volumes and the angiographic measurements were excellent (r = greater than 0.99) with both methods of integration, very good (r = 0.99) using the biplane PM.TP and very satisfactory (r = 0.91) with the monoplane PM.TP. The line of regression was very close to unity with the IM.TP and 0.9 with the PM.TP; this indicates the excellent adaptation of the triangular pyramid model to the shape of the RV. The IM.TP was used in a group of 20 right ventriculographies of patients without cardiac disease: the following results were obtained: EDV = 70.3 +/- 6.6 cm3/m2; ESV = 31.7 +/- 3.9 m3/m2; systolic index = 38.6 +/- 4.5 cm3/m2; ejection fraction = 0.55 +/- 0.04. The correlation of the values of systolic index by cineangiography and thermodilution (39.9 +/- 5.7 cm3/m2) was good (r = 0.86; p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)     

Effects of an interpolated premature ventricular contraction on the AV conduction of the subsequent premature atrial depolarization. An apparent facilitation

Nodal conduction is usually studied by tracing the H1 H2 on function of A1 A2 curves. If one interpolates a PVC before A1, there is a decrease in H1 H2. This might be explained by an A1 H1 interval lengthening (Δ A1 H1). This study was done on 14 consecutive patients in whom a PVC can be interpolated (blocked at the A-V junction). In the majority of these patients, there is a downward and a right hand shift in the curve after an interpolated PVC. On other hand, the curves representing the sum H1 H2+Δ A1 H1 on function of A1 A2 were shifted upward and to the right in 12 of the 14 patients. This indicates inhibition which manifests itself not only by an ERP increase but also by an A2 H2 increase.     

Dynamic alterations of spontaneous neural activity in patients with amyotrophic lateral sclerosis

Amyotrophic lateral sclerosis (ALS) is a multi-system disease featured by movement disorder. Studies on ALS using static neuroimaging indexes demonstrated inconsistent results. However, recent work indicated that the intrinsic brain activity was time-varying, and the abnormal temporal dynamics of brain activity in ALS remains unknown. Resting-state functional magnetic resonance imaging data were first obtained from 54 patients with ALS and 54 healthy controls (HCs). Then the dynamic regional homogeneity (d-ReHo) was calculated and compared between the two groups. Correlation analyses between altered d-ReHo and clinical scores were further performed. Compared with HCs, ALS patients showed higher d-ReHo in the left lingual gyrus while lower d-ReHo in the left rectus gyrus and left parahippocampal gyrus. Moreover, the d-ReHo in the left lingual gyrus exhibited correlation with disease progression rate in ALS at a trend level. Our findings suggested that altered dynamics in intrinsic brain activity might be a potential biomarker for diagnosing of ALS.

     

Electrocardiagraphic changes of Prinzmetal's angina type in the acute phase of myocardial infarct]

The authors have studied the frequency and severity of anginal attacks of the Prinzmetal type coming on during the acute phase of a myocardial infarction in 13 patients. They have occurred in 5.50% of cases (anginal attacks of all types occurring in 18.34% of cases). The severity of these attacks is shown by their clinical features: the multiplicity of the attacks, the high incidence of arrhythmias, the difficulties encountered with medical treatment. This also confirmed by the enzyme studies: when the curve of myocardial creatinine kinase release is drawn, there is seen to be an extension of the lesion in 2/3 cases, whereas the electrocardiograph does not show this up.     

Effects in conscious dogs of ajmaline,propranolol, amiodarone and verapamil on right ventricular anodal strength-interval curves

We studied the effect of antiarrhythmic drugs on the right ventricular anodal strenth-interval curve in the conscious dog. The anodal strenth-interval curve differs from its cathodal homologue by a shorter refractory period, a higher late diastolic threshold and the existence of a dip corresponding to a period of rhythmic vulnerability. The dogs were equipped with permanent ventricular electrodes; the heart was driven at a constant frequency by left ventricular stimulation and the anodal extra-stimulus was delivered on the right ventricle. This technique allowed us to determine the variations in the effective refractory period, the interventricular conduction (IVC) and the specific curve thresholds (late diastolic threshold, LDT, minimal dip level, Sm, maximal post dip threshold, SM). Ajmaline, a quinidine-like drug, significantly increased IVC and all the thresholds. Only high doses lengthened the effective refractory period. Propranolol, a β-blocking agent significantly increased Sm. The intrinsic effect of amiodarone, a non-specific anti-adrenergic drug and a potent anti-anginal substance seemed to result in a significant increase in LDT, Sm, SM. Verapamil, a calcium antagonist only caused a significant increase in SM. Therefore, each of the four drugs studied, belonging to a different group of teh Vaughan Williams classification, acted in a different way on the anodal strengh-interval curve. This study clarified the mechanisms by which these drugs exert their antiarrhythmic effect.     

顺铂致肾损伤大鼠Ⅲ型胶原表达的变化

目的观察顺铂致肾损伤大鼠Ⅲ型胶原(ColⅢ)表达的变化。方法选用健康、雄性SD大鼠20只,将其随机分为2组:模型组10只予尾静脉注射顺铂5 mg/kg,每周1次,连续3周,复制顺铂肾损伤大鼠模型;正常对照组10只予尾静脉注射等量的生理盐水。饲养8周,行PAS染色观察实验大鼠肾组织形态学改变,并用免疫组化方法检测实验大鼠肾脏ColⅢ的表达。结果模型组出现严重的病理损害,肾间质纤维组织增生,ColⅢ沉积明显增加。结论顺铂致肾损伤大鼠ColⅢ沉积明显增加,最终可发展为肾间质纤维化。