Direct Recording of Concealed Ventricular Extrasystoles Producing Pacer Inhibition

We report a case of concealed extrasystoles recorded from a pacing lead. The concealed extrasystoles were observed with right ventricular pacing, biventricular unipolar, and biventricular bipolar pacing. The simultaneous surface EKG did not show manifest ventricular extrasystoles with the concealed intracardiac potentials. This case highlights a cause of oversensing that has been theoretically reported in the literature but never directly observed.     

An Evaluation of a New ECG Monitor which Detects and Classifies Ventricular Extrasystoles

Summary: An evaluation of a new ECG monitor which detects and classifies ventricular extrasystoles.
A device is described which is highly efficient in detecting and classifying ventricular ectopic beats. This instrument may have a significant role in patient monitoring. The system is based on analysis of a 5 electrode orthogonal system with comparison of QRS wave forms with a stored normal wave form. The design was based on a test tape derived from 26 patients and evaluated further on long recordings of 16 other patients. Results indicate that the device is highly reliable in QRS detection and in detection of ventricular ectopic beats. The problem of artefacts due mainly to patient movement is held within reasonable limits.     

Ventricular Extrasystoles with Interpolation or Postponed Compensatory Pause during Atrial Fibrillation: Fact or Fiction?

A Holter recording obtained from a patient with atrial fibrillation showed ventricular extrasystoles often in bigeminal rhythm. Most extrasystoles were followed by a long return cycle, and only in a few instances the postextrasystolic interval was short. The latter phenomenon was interpreted as a manifestation of poor retrograde concealed penetration of the ventricular impulse into the atrioventricular (A‐V) junction: accordingly, an ensuing relatively early fibrillation impulse reached the ventricular chamber, since it did not find the A‐V node refractory. These events are similar to what happens in interpolated ventricular extrasystoles occurring during sinus rhythm, the absent or minimal concealed retrograde penetration of the ectopic impulse into the A‐V node being necessary to permit anterograde conduction of the ensuing sinus impulse. Analysis of the recording also revealed that a very long (>2 second) interval between two consecutive narrow beats only occurred after an “interpolated” extrasystole. This was interpreted with the same mechanism underlying the “postponed compensatory pause” observed at times after interpolated ventricular extrasystoles during sinus rhythm: the minimal or nil penetration of the ventricular ectopic impulse into the A‐V junction, followed by conduction of an ensuing early atrial impulse, “shifts to the right” the A‐V nodal refractory period, preventing conduction of several further supraventricular impulses and generating a pause. Both interpolated ventricular extrasystoles and the phenomenon of “postponed compensatory pause” are, thus, conceivable during atrial fibrillation, although no definite demonstration is possible.     

胺碘酮联合倍他乐克治疗冠心病频发室性期前收缩的疗效观察

目的探讨胺碘酮联合倍他乐克治疗冠心病室性心律失常的疗效及安全性。方法将60例冠心病频发室性期前收缩患者随机分为观察组(30例)和对照组(30例),观察组给予静脉注射胺碘酮(24h)及口服维持,同时口服倍他乐克治疗;对照组静脉注射利多卡因(24h),同时口服倍他乐克治疗,疗程均为4周。结果观察组总有效率为90.0%,高于对照组的76.7%,差异有统计学意义(P<0.05)。两组不良反应发生率比较,差异无统计学意义(P>0.05)。结论胺碘酮联合倍他乐克治疗冠心病室性心律失常安全、有效。     

Tuberculosis in disadvantaged groups

Tuberculosis remains predominantly a disease of the disadvantaged and marginalized. The incidence of the disease is increasing in many industrially developed countries, particularly among the poor, ethnic minorities, prisoners and other institutionalized persons, and the socially isolated and hard to reach groups. Strengthening of the tuberculosis services is required to care for these groups. Millions of people in the developing nations are disadvantaged by poverty and inequity, and recent health sector reforms have not always been entirely in their interest. A further serious problem is the HIV/AIDS pandemic, which not only facilitates the spread of tuberculosis but, by its associated stigma, leads to delayed treatment seeking and poor adherence to therapy. In recent times, emphasis has moved away from didactic principles of tuberculosis "control" to community-and patient-centered health services, based on analysis of local factors affecting case finding and adherence to therapy.     

ABO blood groups and age groups in surgical venous thromboembolism.

In a series of cases of surgical thromboembolism there were significant age differences in the ratio of cases of blood group A to those of blood group O, the ratio being highest in the youngest age groups.     

Prognostic groups in colorectal carcinoma

Summary A system of classifying colorectal carcinomas into five prognostic groups is described. This classification includes not only tumor spread, regional lymph node involvement, and distant metastases, but also resectability and R-classification (residual tumor or curability). All patients with colorectal tumors can be classified by means of this system. The five prognostic groups differ statistically significantly (p<0.01) from one another with respect to age-corrected 5-year survival rates.     

Unipotent groups in invariant theory

The finite generation of the ring of invariants of a special class of unipotent groups is established-namely, unipotent radicals of parabolic subgroups.