…the use of medications that slow ventricular rate (beta blockers being the mainstay of this therapy). Rate control does not affect the rhythm per se …

…When prescribed for antianginal purposes in CCS, the target resting heart rate is generally 55–60 beats per minute. Beta blockers also have prognostic value…

…and drug induced reactions. Approximately 90% of anaphylactic cardiac arrests present with pulseless electrical activity (PEA) as the initial rhythm, while the remainder manifest ventricular…

…The cells of the sinus node have an intrinsic rate of depolarization at approximately 70 times per minute, which results in 70 contractions per minute…

…pressure or other conventional risk factors. Colchicine is an established anti inflammatory drug that may inhibit inflammasome activity, reduce interleukin 1β and interleukin 6…

Arrhythmias and arrhythmology Pharmacology & dosing Definition and Pathophysiology Sotalol is a nonselective beta adrenoceptor blocker devoid of intrinsic sympathomimetic activity that also prolongs cardiac repolarization…

…infarction physical activity programmes into a structured centre of secondary cardiovascular prevention in which exercise, lifestyle intervention, education, and guideline directed medical therapy are integrated…

…clearance of circulating LDL cholesterol (LDL C). Increased PCSK9 activity therefore contributes to higher LDL C concentrations. The genetic evidence provides the rationale for therapeutic…

…via the autonomic nervous system. It attenuates carotid sinus baroreceptor activity and acts centrally and peripherally to enhance vagal tone. These sympatho inhibitory effects decrease…

…responses and immune activity. Statin intolerance refers to adverse effects attributed to statin treatment that improve or resolve after reducing the dose or stopping therapy…

…DW, Wickman LL, Swart GL. The hemodynamic and arterial blood gas response to asphyxiation: a canine model of pulseless electrical activity. Resuscitation 1995; 30:16975…

…cause of pacemaker mediated tachycardia is endless loop tachycardia, which also depends on the ventricular stimulation being triggered by atrial activity. In endless loop tachycardia…

…toxins (alcohol, cocaine, cancer therapies), or physical reactions (radiation therapy), frequently involves the conduction system. In these conditions, involvement of the AVN and the conduction…

…resting heart rate ≥70 beats/min; persistent symptoms despite evidence based therapy with an ACE inhibitor or ARNI, a beta blocker and a mineralocorticoid receptor…

…vasodilation. Although primarily defined by these mechanisms, levosimendan also exhibits some type 3 phosphodiesterase inhibitor (PDEI) activity, which may contribute to its inotropic profile. The…

…acid reduction of approximately 10% to 15% Possible effects on erythropoietin activity and erythropoiesis SGLT2 inhibition may also activate adenosine 5′ monophosphate activated protein kinase…

…decreasing and the incidence of NSTEMI is increasing, STEMI remains a critical clinical entity requiring immediate reperfusion therapy. The pathophysiology of myocardial infarction injury involves…

…means that the automaticity is diminished). Chronotropic incompetence (inability of the sinoatrial node to adequately increase its automaticity during physical activity). Sinus arrest & sinus pause…

…or free wall rupture. Free wall rupture is more common after fibrinolytic therapy than after PCI in the reported clinical profile, whereas primary PCI appears…

…cholesterol and glucose levels, together with a low salt, low cholesterol diet, regular physical activity, avoidance of smoking, and adequate sleep. The process should begin…

…and severity of underlying cardiovascular disease. Conduction disease and the need for pacemaker therapy may be more frequent in T2DM, although management follows the same…

…uterus to the left. Consider tilting the patient at a 15–30° left lateral angle to relieve pressure on the major vessels. A large uterus…

…and treatment of life threatening ventricular tachyarrhythmias. Propafenone is usually not the first line therapy in this patient category. Prophylaxis and treatment of symptomatic paroxysmal…

…heart failure. Mitral stenosis typically becomes symptomatic at rest when the valve area is reduced to 1.5 cm 2 . During physical activity, mitral stenosis…

…blood pressure, nonpharmacological management should be actively implemented. Adults with blood pressure ≥140/90 mmHg should receive both lifestyle and antihypertensive drug therapy. For grade…

…Activity Volume and Intensity For adults, the principal preventive target is: 150–300 minutes per week of moderate intensity aerobic activity; or 75–150 minutes…

…ECG Ventricular fibrillation, pulseless electrical activity (PEA) and sudden cardiac arrest This chapter will focus on ventricular fibrillation and pulseless electrical activity (PEA). These are…

…must therefore start at 5 minutes and be escalated without unnecessary pauses [1]. The aims are, simultaneously, to: 1. terminate clinical and electrographic seizure activity…

…increasing catecholamine activity. Effects Primarily causes afterload reduction. Time to onset of action 1 to 2 minutes Duration of action 10 to 30 minutes Delivery…

…organized, continuous atrial electrical activity. This activity most commonly presents as a characteristic saw tooth pattern at rates typically exceeding 200 beats per minute. While…

…VF) and pulseless ventricular tachycardia (VT). The bradyarrhythmias include all bradyarrhythmias, pulse less electrical activity (PEA), and asystole. Bradyarrhythmias are discussed in the chapter Management…

…re entry mechanisms; triggered activity is a less frequent cause. The atrial rate typically ranges from 120 to 250 beats per minute. To fulfill the…

…aged 18 to 70, who received bystander CPR and initially presented with a ventricular arrhythmia without return of spontaneous circulation within 15 minutes, were included…

…electrical currents. An ECG lead is a graphical description of the electrical activity of the heart and it is created by analyzing several electrodes. In…

…the same time. 6. Measure the glucose again after 10 to 15 minutes and repeat treatment until the patient has recovered. 7. Follow up with…

…arrhythmia unit. Assessment of the effect of adenosine, which can be given during the recording and unmask the atrial activity. The investigation is diagnostic, not…

…while awaiting the antidote and specific treatment. Bradyasystole during and after cardiac arrest with persisting electrical activity. Overdrive pacing in bradycardia dependent torsades de pointes…

…depletion and high plasma renin activity increase the effect of enalaprilat, and may cause severe hypotension. Time to onset of action 15 to 30 minutes…

…rate is extremely low—such as less than 40 to 50 beats per minute in the first 4 to 6 hours after an acute infarction…

…thrombus formation and sympathetic activation. Rho kinase may increase vascular smooth muscle sensitivity to calcium by inhibiting myosin phosphatase activity. Patients with VA are generally…

…at low and high heart rate, the behavior of the pacemaker in the presence and absence of intrinsic cardiac activity, Modern pacemakers are packed with…

…it is exhaled. The final partial pressure of carbon dioxide in exhaled air represents the sum of ventilation, metabolic activity, and perfusion. Increased aerobic metabolism…

…finding in acute coronary syndromes). Between 3 8 minutes, pulseless electrical activity (PEA) develops. PEA progresses to asystole within minutes, as outlined in the studies…

…small to be detected by skin electrodes; the ECG presents the electrical activity of the atrial and ventricular myocardium. Automaticity of pacemaker cells The automaticity…

…The battery is used to deliver pacing pulses, sensing (analyzing electrical activity in the heart) and store electrocardiograms. The pacemaker is powered by a lithium…

…Any heart rate faster than 100 beats per minute is defined as tachycardia , which is synonymous with tachyarrhythmia. Except for sinus tachycardia during physical activity…

…of the heart rate is due to increased Vagus nerve activity caused by digoxin. Increased Vagus activity diminishes the automaticity in the sinoatrial node (which…

…then 12 x 10 = 120; so the heart rate should be about 120 beats per minute. Chest pain (chest discomfort) Chest pain during exercise…

…the myocardium). Thus, increased sympathetic activity results in increased heart rate and stronger contractions. Physical exercise increases the venous return to the heart, which results…

…individual variation in maximum heart rate . The standard deviation for maximum heart rate is around 10 beats per minute, which means that if the expected…

…under baseline conditions. Raw Image Analysis : Raw images are reviewed to identify potential artifacts, extracardiac tracer activity, and assess image quality and patient motion. Alignment …

…These age variations in heart rate are due to variations in the activity of the autonomic nervous system and changes in the automaticity of the…

…the lowest heart rate allowed by the pacemaker; intrinsic cardiac activity below the base rate will trigger pacing. The base rate is usually set to…

…system ensures rapid and synchronized spread of depolarization, which is essential for coordinated and efficient atrial and ventricular activity. The conduction system includes the sinoatrial …

…vasodilators replicate the effects of exercise on coronary arteries, without the need for physical activity. Advantages of regadenoson over adenosine Regadenoson has advantages over adenosine…

…flow using PET Quantitative PET perfusion imaging offers precise measurements of myocardial blood flow in milliliters per minute per gram of tissue (mL/min/g)…

…abnormalities affect the myocardial area supplied by the arteries distal to the occlusion or stenosis. If the ischemia persists for 20 minutes, myocardial infarction ensues…

…with a positive P wave in lead II, but the heart rate exceeds 100 beats per minute. Although sinus tachycardia is the most common tachyarrhythmia…

…include pulse less electrical activity (PEA), asystole, and bradycardia. No Flow : Circulatory standstill, circulatory flow arrest. No flow time : The duration (minutes) from circulatory collapse…

…The junctional escape rhythm is regular, with a frequency of roughly 40 beats per minute. If the escape rhythm has wide QRS complexes and a…