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The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness. [8] Chronotropic incompetence (CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation.
Degeneration of heart tissue because of aging; Damage to tissues in the heart from heart attack, heart disease or injury; High blood pressure or hypertension; Congenital heart defect which is a permanent disorder present at birth; Heart tissue infection also known as myocarditis -Complication of heart surgery; Hypothyroidism or an underactive ...
The decreased heart rate can cause a decreased cardiac output resulting in symptoms such as lightheadedness, dizziness, hypotension, vertigo, and syncope. [3] The slow heart rate may also lead to atrial, junctional, or ventricular ectopic rhythms. Bradycardia is not necessarily problematic.
The resting heart rate in children is much faster. In athletes, however, the resting heart rate can be as slow as 40 beats per minute, and be considered normal. [citation needed] The term sinus arrhythmia [26] refers to a normal phenomenon of alternating mild acceleration and slowing of the heart rate that occurs with breathing in and out ...
Sinus node dysfunction (SND), also known as sick sinus syndrome (SSS), is a group of abnormal heart rhythms (arrhythmias) usually caused by a malfunction of the sinus node, the heart's primary pacemaker. [1] [2] Tachycardia-bradycardia syndrome is a variant of sick sinus syndrome in which the arrhythmia alternates between fast and slow heart ...
Chronic fatigue immune dysfunction syndrome: CFS Chronic fatigue syndrome: CGBD Corticobasal ganglionic degeneration: CH Cluster headache: CHARGE syndrome: Coloboma of the eye, heart defects, atresia of the nasal choanae, retarded growth & or development, genital abnormalities, ear abnormalities CHD Congenital heart disease: CHD Congenital hip ...
Circulatory hypoxia, [8] also known as ischemic hypoxia or stagnant hypoxia, is caused by abnormally low blood flow to the lungs, which can occur during shock, cardiac arrest, severe congestive heart failure, or abdominal compartment syndrome, where the main dysfunction is in the cardiovascular system, causing a major reduction in perfusion ...
Heart failure (HF), also known as congestive heart failure (CHF), is a syndrome caused by an impairment in the heart's ability to fill with and pump blood. Although symptoms vary based on which side of the heart is affected, HF typically presents with shortness of breath , excessive fatigue , and bilateral leg swelling . [ 3 ]