the purpose of the present study was to investigate the effect of music tempo on heart rate and rate of perceived exertion of male physical education students. to this purpose, 45 male physical education students (height: 172.27 cm, sd=16.22, body mass index (bmi): 22.27kg/m², sd=3.08, weight: 68/05kg, sd=11.73, age: 21.93 years, sd=1.81) were randomly divided into control, high tempo (bpm=140)...

Aim: Assessment and comparison of different algorithms that Automated External Defibrillators (AEDs) use to recognize as shockable monomorphic and polymorphic Ventricular Tachycardia (VT). Method: Engineering bench tests for a descriptive systematic evaluation in commercially available AEDs. AEDs were tested through an electrocardiographic (ECG) simulator that is capable to generate different k...

A 22-year-old girl was admitted to our cardiology institute with Permanent tachycardia in last 6 years for diagnostic assessment and therapy. Doppler echocardiography show structural of heart is normal, ECG revealed a varied resting rate from 120 to 140 bpm, 1:1 AV ratio and long RP interval. P wave morphology was negative on leads I, II, III, aVF, and V4 to V6, positive on lead V1, and diphasi...

BACKGROUND The structure-function relationship in the atrioventricular junction (AVJ) of various animal species has been investigated in detail; however, less is known about the human AVJ. In this study, we performed high-resolution optical mapping of the human AVJ (n = 6) to define its pacemaker properties and response to autonomic stimulation. METHODS AND RESULTS Isolated, coronary-perfused...

BACKGROUND This study aims to assess the incidence and clinical relevance of slow ventricular tachycardia (VT) and the effectiveness and/or deleterious effects of antitachycardia pacing in slow VT in implantable cardioverter-defibrillator recipients. METHODS AND RESULTS This multicenter prospective randomized study included 374 patients (326 men) without prior history of slow VT (<148 bpm) im...

OBJECTIVE Report clinical experience in surgical treatment of atrial fibrillation (AF) by Cox-maze procedure. METHODS 61 patients underwent surgical treatment for AF. Two had primary AF and 59 AF secondary to heart disease (2 atrial septal defects, 57 mitral). Ages ranged from 20 to 74 years (mean = 49). There were 44 females (72%). The surgical technique employed was Cox 3 without cryoablati...

A 73-year-old man with fatigue and exertional dyspnea was referred to our clinic for evaluation of daily episodes of regular palpitations. His past medical history was notable for hypertension, diabetes mellitus, chronic obstructive pulmonary disease and hypothyroidism on medical therapy. Five months' prior he was implanted with a permanent bicameral pacemaker (PM) for sick sinus syndrome assoc...

At the beginning of the recording, atrial tachycardia (AT) can be observed with 1:1 conduction at ventricular rate 140 bpm (upper track). At the spontaneous termination of the tachycardia, atrial-ventricular pacing at 45 bpm (lower rate) and after two cycles atrialventricular pacing at 100 beats/min (upper track) can be observed. The rate drop response was activated: drop size 25 ppm, drop rate...

BACKGROUND We hypothesize that inferior vena cava-inferior atrial ganglionated plexus nerve activity (IVC-IAGPNA) is responsible for ventricular rate (VR) control during atrial fibrillation (AF) in ambulatory dogs. METHODS AND RESULTS We recorded bilateral cervical vagal nerve activity (VNA) and IVC-IAGPNA during baseline sinus rhythm and during pacing-induced sustained AF in 6 ambulatory dog...