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  2. Vagal tone - Wikipedia

    en.wikipedia.org/wiki/Vagal_tone

    Respiratory sinus arrhythmia (RSA) is frequently used as a noninvasive method for investigating vagal tone, in physiological, behavioral, and several clinical studies. [ 16 ] [ 17 ] [ 18 ] This can be done using electrocardiography (ECG) recording, [ 19 ] although other methods are also being developed that take advantage of the interactions ...

  3. Sinus arrhythmia - Wikipedia

    en.wikipedia.org/wiki/Sinus_arrhythmia

    Sinus arrhythmia is a commonly encountered variation of normal sinus rhythm. Sinus arrhythmia characteristically presents with an irregular rate in which the variation in the R-R interval is more than 0.12 seconds (120 milliseconds). Additionally, P waves are typically mono-form and in a pattern consistent with atrial activation originating ...

  4. Chest pain in children - Wikipedia

    en.wikipedia.org/wiki/Chest_pain_in_children

    Respiratory associated causes compose 13% to 24% of pediatric chest pain symptoms. Gastrointestinal and psychogenic symptoms reported by parents and patients occur less than 10% of the time. Cardiac causes of pediatric chest pain are found infrequently and are not identified more than 5% of the time. Unknown causes, were estimated to account ...

  5. Arrhythmia - Wikipedia

    en.wikipedia.org/wiki/Arrhythmia

    Arrhythmias also cause chest pain and shortness of breath. [citation needed] Some arrhythmias do not cause symptoms and are not associated with increased mortality. However, some asymptomatic arrhythmias are associated with adverse events. Examples include a higher risk of blood clotting within the heart and a higher risk of insufficient blood ...

  6. Heart rate variability - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_variability

    Respiratory arrhythmia (or respiratory sinus arrhythmia). [39] [40] This heart rate variation is directly caused by the central respiratory rhythm, faithfully tracks the respiratory rate across a range of frequencies and is a major cause of heart rate variability in humans (Cooper HE, Clutton-Brock TH & Parkes MJ (2004). Contribution of the ...

  7. Bradycardia - Wikipedia

    en.wikipedia.org/wiki/Bradycardia

    Non-respiratory causes of sinus arrhythmia include sinus pause, sinus arrest, and sinoatrial exit block. Sinus pause and arrest involve slowing or arresting of automatic impulse generation from the sinus node. This can lead to asystole or cardiac arrest if ventricular escape rhythms do not create backup sources of cardiac action potentials. [2]

  8. Sinus node dysfunction - Wikipedia

    en.wikipedia.org/wiki/Sinus_node_dysfunction

    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 ...

  9. Tachycardia-induced cardiomyopathy - Wikipedia

    en.wikipedia.org/wiki/Tachycardia-induced_cardio...

    [1] [5] People with TIC may have symptoms associated with heart failure (e.g. shortness of breath or ankle swelling) and/or symptoms related to the tachycardia or arrhythmia (e.g. palpitations). [1] [2] Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease. [5] [1]

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