Bradycardia : theo định nghĩa, nhịp tim đập bình thường khoảng 60100 / một phút. Dưới mức 60/phút và EKG cho thấy PP interval kéo dài hơn 1 second thì hợp đủ điều kiện để gọi là bradycardia (hoặc nói cho rõ hơn : sinus bradycardia, để chỉ tim đập chậm lại có nguyên cớ từ sinus node) . Sinus bradycardia không phái hoàn toàn bất thường : khoảng 25 % thanh niên có bradycardia và có thể thấy thường ở các lực sĩ (athletes) (Northcote et al: EKG findings in males veteran endurance athletes.
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: A new association of multiple congenital anomalies/mental retardation syndrome with bradycardia-tachycardia syndrome: a case report
(BQ) Part 1 book "Pocket ECGs A quick information guide" presents the following contents: The electrocardiogram, analyzing the ECG, sinus dysrhythmias (normal sinus rhythm characteristics, sinus bradycardia characteristics, sinus arrest characteristics,...)
(BQ) Part 2 book "Master visual diagnosis of ECG - A short atlas" presents the following contents: How to read ECG and make diagnosis, lead position reversal, sinus bradycardia, sinus bradycardia, sinus tachycardia, some details of fascicular blocks, introduction to electrocariographic features of myocardial infarction
Overdose, including self-poisoning, causes bradycardia, heart block, hypotension and low output cardiac failure that can proceed to cardiogenic shock; death is more likely with agents having membrane stabilising action (see Table 23.1). Bronchoconstriction can be severe, even fatal, in patients subject to any bronchospastic disease; loss of consciousness may occur with lipid-soluble agents that penetrate the central nervous system. Receptor blockade will outlast the persistence of the drug in the plasma. Rational treatment includes: • Atropine (1-2 mg i.v.
Sedation is the important factor in comfort of brain trauma patients. Insuffient sedation
causes hypertension, tachycardia, hypoxia, hypercapnia and uncomfortable with ventilator.
On the other hand excess sedation causes hypotansion, bradycardia, coma, respiratory
depresion, ileus, renal insufficiency, veinous stasis and immunosupression.
For the patients in the critical care unit firstly nonpharmacological method should be
experinced for sedation. The patients should be frequently oriented.
The concept of rate-modulated (rate-responsive, rate-adaptive) pacemakers is to move beyond simple backup pacing for bradycardias to helping a patient adapt to physiologic stress with an increase in heart rate, even if the patient's intrinsic sinus node normally would not allow this to occur. The development of dual-chamber pacemakers allows a patient to increase the heart rate if he or she is in sinus rhythm and sinus function is intact. Many patients, however, have sick sinus syndrome that prevents normal physiologic sinus node response to exercise, stress, or chronic atrial fibrillation.
The implantable cardioverter defibrillator (ICD), an electric device which includes a pacemaker, has undergone revolutionary changes. Although the device initially was developed only to defibrillate patients with ventricular tachycardia or ventricular fibrillation, who did not respond to antiarrhythmic drug therapy, all current models are able to provide defibrillation, low-energy cardioversion, antitachycardia pacing for ventricular tachycardia termination, and bradycardia pacing backup.
Given the complexity of critical care practice today, it’s
impossible for even experienced clinicians to remember
all the information required to give safe and effective care
to critically ill patients. Clinicians frequently need to use a
variety of clinical resources to verify drug information,
normal laboratory and physiologic values, ECG and hemodynamic
monitoring information, emergency algorithms,
and other essential facts of patient management.
Patients with AN typically have few physical complaints but may note cold intolerance. Gastrointestinal motility is diminished, leading to reduced gastric emptying and constipation. Some women who develop AN after menarche report that their menses ceased before significant weight loss occurred. Weight and height should be measured to allow calculation of body mass index (BMI; kg/m2). Vital signs may reveal bradycardia, hypotension, and mild hypothermia. Soft, downy hair growth (lanugo) sometimes occurs, and alopecia may be seen.
Disorders of Vascular Tone or Blood Volume
Disorders of vascular tone or blood volume that can cause syncope include the reflex syncopes and a number of conditions resulting in orthostatic intolerance. The reflex syncopes—including neurocardiogenic syncope, situational syncope, and carotid sinus hypersensitivity—share common autonomic nervous system pathophysiologic mechanisms: a cardioinhibitory component (e.g., bradycardia due to increased vagal activity), a vasodepressor component (e.g., inappropriate vasodilatation due to sympathetic withdrawal), or both.
Table 76-1 Common Characteristics of Anorexia Nervosa and Bulimia Nervosa
Late adolescence/early adulthood
5% per decade
Physical and Laboratory Findingsa
To my mind electrocardiogram interpretation is all about pattern recognition. This collection of 18 articles covers all the important
patterns encountered in emergency medicine. Whether you are a novice or an experienced clinician, I hope that you find this book
enjoyable and clinically relevant.
ECG with no association between the QRS complex and the P wave. The child is
often symptomatic, presenting with acute collapse. Ventricular tachyarrhythmias are
often associated with underlying heart disease such as cardiomyopathy. Torsades de
Pointes is a particular form of sinusoidal ventricular arrhythmia that occurs in the rare
congenital long QT syndrome.
(BQ) Part 1 book "Understanding intracardiac EGMs and ECGs" presents the following contents: Electrophysiology concepts (Fluoroscopic anatomy and electrophysiologic recording in the heart, programmed stimulation, bradycardia, supraventricular tachycardia, wide complex tachycardia, new technology, power sources for ablation).