Verapamil was administered by intravenous injection to 181 patients with various cardiac arrhythmias. The automaticity of the cardiac pacemaker was slowed in sinus, idionodal, and idioventricular tachycardia. In atrial fibrillation the drug usually slowed the ventricular response and often made it regular. In some cases atrial flutter was converted to sinus rhythm, the ventricular response bein...

ATRIAL FIBRILLATION is the characteristic arrhythmia of the advanced stages of mitral stenosis, being present in 40 per cent of such cases. Paradoxically, mitral valve surgery, which relieves the obstruction and reduces the hemodynamic overload of the left atrium, frequently precipitates either transient or permanent atrial fibrillation. The reported incidence of this disorder after mitral oper...

IN 1963 a study was published from our laboratory concerning cardiac performance during exercise before and after conversion from atrial fibrillation to sinus rhythm.' All subjects were receiving digitalis at the time of conversion. One of the findings of that study was a markedly low heart rate at exercise in sinus rhythm, much lower than expected for a group of subjects with a comparable degr...

AIMS Detection and careful stratification of fetal heart rate (FHR) is extremely important in all pregnancies. The most lethal cardiac rhythm disturbances occur during apparently normal pregnancies where FHR and rhythm are regular and within normal or low-normal ranges. These hidden depolarization and repolarization abnormalities, associated with genetic ion channelopathies cannot be detected b...

It is estimated that over 60% of out-of-hospital cardiac arrest (OHCA) patients with a shockable rhythm are refractory to current treatment, never achieve return spontaneous circulation, or die before they reach the hospital. Therefore, we aimed identify whether field resuscitation time associated survival rate in OHCA (rOHCA) initial rhythm. This cross-sectional retrospective study extracted d...

OBJECTIVE To review the diagnosis and management of cardiac arrhythmias in a two-part presentation. DATA SOURCES Articles and published peer-review abstracts on tachycardias and bradycardias. SUMMARY OF REVIEW Normal cardiac rhythm originates from impulses generated within the sinus node. These impulses are conducted to the atrioventricular node where they are delayed before they are distri...

Background and aims: Cardiopulmonary resuscitation (CPR) success rate is an important issue for allhealthcare facilities. In the present study, success rate and related factors were assessed in a hospitalin Iran.Methods: This descriptive-correlational study was conducted in 2017. By using the conveniencesampling, 156 patients were selected. Variables based on the In-Hosp...

Heart rhythm was analysed with regard to spontaneous or pacemaker-induced heart activity, in a consecutive series of 282 patients paced for at least 1 year. The mean duration of pacing was 59 (13 to 180) months. The mean age of the patients was 76 (39 to 93) years. Spontaneous heart activity at all routine examinations was found in 33 (12%) of the patients. Pacemaker-induced rhythm only was rec...

Using strictly defined criteria of significant arrhythmias, long term electrocardiographic recording has been evaluated for confirmation of arrhythmias as the cause of cerebral symptoms in 81 patients with suspected Adams-Stokes syndrome. Extension of long term electrocardiographic recording for more than 24 hours gives marginal additional information at a high cost. Among 43 patients monitored...