St. Helens Chronicle. August 18 at 7:00pm Â·. I would suggest the City of St. Helens contact Boise, ask for at least one-half the cost of this cleanup of this PP and, if they do not agree, the City of St. Helens should bring suit against Boise for knowingly polluting and contaminating our environment.
Arrhythmias are characterized by their site of origin:  the atria or the ventricles. Supraventricular arrhythmias occur in the upper areas of the heart and are less serious than ventricular arrhythmias. Ventricular fibrillation is the most serious arrhythmia and is fatal unless medical help is immediate.
Sustained tachyarrhythmias in the atria, such as atrial fibrillation, paroxysmal atrial tachycardia (PAT), and supraventricular tachycardia (SVT), originate because of micro-or macro re-entry. In general, the seriousness of cardiac arrhythmias depends on the presence or absence of structural heart disease.The most common example of a relatively benign arrhythmia is atrial fibrillation (see the chapter â Atrial Fibrillation)â.Similarly common are PACs and PVCs, which, although a nuisance, generally are benign in the absence of structural heart disease.n general, the seriousness of cardiac arrhythmias depends on the presence or absence of structural heart disease. The most common example of a relatively benign arrhythmia is atrial fibrillation (see the chapter â Atrial Fibrillation)â.