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Practical Approach to the Patient with Palpitations

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Practical Approach to the Patient with Palpitations CHAPTER Practical Approach to the Patient with Palpitations 14 MS Aditya, K Sarat Chandra Palpitations as a symptom is a common cause for To evaluate a particular patient it is important to known consultation in general, casualty and cardiology practice. the potential causes of palpitations. Possible aetiologies10-16 The term Palpitation has its roots in the Latin verbs have beenlisted in Figure 1. ‘palpare’, ‘palpitare’ meaning patted or touch gently. The diagnostic and therapeutic management of palpitations is CLINICAL EVALUATION OF PALPITATIONS often frustrating and confusing both to practitioner and As in any clinical situation a thorough history and patient. This is because of myriad causes of this symptom examination will help to arrive at an appropriate and poor reproducibility. From the management point of diagnosis. view causes could range from psychosomatic disorders to For the purpose of clinical clarity four types of life threatening arrhythmias.1-3 palpitations have been identified in practice. Though Palpitation has been defined as a disagreeable sensation no clear differentiation is possible four types have been 17-18 of pulsation or movement in the chest and/or adjacent identified Figure 2. areas. In resting conditions one does not usually perceive Extrasystolic palpitation are usually sudden in onset heartbeat. During intense physical or emotional stress it perceived as a skipped or jumped beat usually interspersed is quite normal to be aware of one’s own cardiac activity with normal periods. making them physiological. Outside of these situations palpitations are abnormal. Tachycardiac palpitations are perceived as rapid flapping movements over the chest could be irregular or regular Palipitations are a frequent clinical presentation and be associated with angina, syncope and fatigue. accounting for upto 15-20% of general practice and second to chest pain in cardiology setups. Palpitations Anxiety related palpitations are usually associated with originate from a variety of causes, cardiac related in slight increase in heart rates and associated with tingling approximately 43% of cases, psychosomatic in 30% and sensations in hands and feet, atypical chest pain etc. unknown/miscellaneous cause in 27%4-8. Arrhythmias Pulsation is a feeling felt after strong contraction of the cause palpitations often but significant number of patients heart following increased contractility or stroke volume. with arrhythmias don’t report palpitation as a symptom. There is every need to have a evidence based structured History should be focused and directed to achieve evaluation of patients presenting with palpitations to help reasonable success in arriving at possible diagnosis. us identify patients with more serious conditions. SITUATIONS LEADING TO PALPITATIONS Palpitations are perceived with still less understood • Functional state -sleep, during sport or normal sensory afferent pathways with receptors in myocardial, exercise, change inposture, after exercise. pericardial or peripheral receptors. These stimuli are • Positional variation or trigger. transmitted to sub cortical areas and base of frontal lobes9. Receptors could be triggered for a variety of reasons as • Precipitating factors -emotion, exercise, squatting. listed in Table 1. • Onset of palpitations-Abrupt or slowly arising. Table 1: Triggers of Arrhythmias • Premonitory symptoms -Angina, dyspnea, vertigo, Variation in Arrhythmias (Tachy and Brady), Sinus fatigue. heart rate tachycardia (systemic illness fever, thyrotoxicosis, anxiety etc) TYPE OF PALPITATIONS Regular, rapid or permanent. Increase in Large increase in stroke volume intensity of secondary to Regurgitantvalvular ASSOCIATED SYMPTOMS contraction lesions, congenital Shunt lesions, Chest pain, syncope or near syncope, sweating, pulmonary Arteriovenous malformation, edema, anxiety, nausea, vomiting. hyperdynamic states(pregnancy, anemia etc) TERMINATION EVENTS Altered Psychosomatic disorders Deceleration or sudden, urination, change in other perception of symptoms. heartbeat 69 Cardiac arrhythmias Cardiac structural anomalies 1. Venticular/supraventricular 1. Severe Aortic,Mitral tachyarrhythmias regurgitation 2. Bradyarrhythmias-sinus 2. Mitral valve proplapse bradycardia,sinus pause,AV 3. Shunt lesions like blocks VSD/ASD/PDA 3. Pacemaker mediated 4. Ebsteins anomaly 5. Dilated,Hypertrohiccardiomyo CHAPTER 14 Palpitations pathy Systemic causes Drugs and others 1. Hyperthyroidism 1. Sympathomimetic agents in 2. Fever inhalers 3. Anemia 2. Anticholinergics 4. Orthostatic syndromes 3. Alcohol, cocaine, 5. Pheochromocytoma caffeine,nicotine 6. Pregnancy 4. Anorexics 5. Psychosomatic Fig. 1: Aetiology of Arrhythmias rhythm or sinus tachycardia, to evaluate the presence of systemic disease. Extrasystolic In the absence of palpitations, signs of structural heart disease thatcould explain the etiology (murmur, clicks, hypertension, valvular heart disease, signs of heart failure). Anxiety Palpitations Tachycardiac Systematic analysis of clinical clues help to get idea into the nature of palpitations they are summarized in Figure 3:19-21 INVESTIGATIONS Pulsation ECG ECG remains the most appropriate investigation to assess a patient of palpitation. During an episode of arrhythmia ECG provides useful information on rate, rhythm and Fig. 2: Types of palpitations suitably temporally done also onset and offset. Vagal maneuvers or pharmacological tests with adenosine or Spontaneously or with vagal maneuvers or drug other drugs under ECG monitoring provide valuable administration. insights into mechanism and triggers of arrhythmia. PAST HISTORY In the absence of arrhythmia ECG provides valuables Age onset of symptoms, frequency, cardiac disease, clues about structural heart disease, arrhythmic substrates psychosomatic disorders, systemic diseases, thyroid and chanellopathies. disorders, family history of cardiac disease, tachycardia or sudden cardiac death, medications at the time of ECG CLUES TO CAUSE OF PALPITATIONS palpitations drug abuse. Short PR interval-AVRT, Atrial fibrillation EXAMINATION P-wave abnormalities, Atrial premature complexes-Atrial Goal is to evaluate the tolerance of a arrhythmia (blood fibrillation pressure, pulmonary edema, etc), and in case of a sinus 70 AVNRT/AVRT AF AT/AFL VT Sudden onset. Exercise or Continuous or paroxysmal. Paroxoysmal or Effort induced, regular in posture induced, regular in Effort, alcohol or meal continuous.Regular in nature nature. Onset of symptoms induced. Irregular in nature except in AV block Hemodynamic from childhood nature compromise Polyuria &frog sign Polyuria Vagal maneuver termination Fig. 3: AVRT- atrio-ventricular reentrant tachycardia; AT- Atrial tachycardia, AF- Atrial flutter; VT- Ventricular tachycardia * Right bundle branch block with coved type/saddle type ST segment elevation in the right precordial ECG leads. #epsilon wave and/or T-wave inversion with QRSduration >110 ms in the right precordial ECG leads seen in ARVD- CARDIOLOGY Arrhythmogenic right ventricular dysplasia ECG MONITORING DEVICES When symptoms are infrequent and inconclusive it makes sense to use devices which can record and transmit/archive ECG. Devices can record ECG data on a continuous basis or be switched on at the onset of palpitation. Holter-Recorders connected to the patient by means of skin electrodes; these recorders are able to perform continuousbeat-to-beat electrocardiographic monitoring via several leads. Monitoring is usually limited to 1-2 days, useful when palpitations are daily occurrence, cumbersome installation may limit patient activity eliminating several triggers Figure 4. Fig. 4: Holter monitoring EVENT RECORDERS Portable devices applied to skin when symptoms are experienced by patient, single lead data is recorded and/or transmitted. Useful for palpitations whose onset happens weekly or more and last long enough till trigger is switched on. ECG quality may not be good, triggers are not recorded, not suitable when hemodynamic impairment occurs (Figure 5). EXTERNAL LOOP RECORDER Connected to the patient on a continuous basis and equipped with a memory loop which can be triggered by patient or automatically. ECG record before the trigger and after is recorded. Useful when palpitations occur weekly or less frequently. Useful for short lasting palpitations and those with hemodynamic impairment. Asymptomatic arrhythmias can be recorded with Fig. 5: Event recorder automatic triggering. Long term usage is inconvenient and less tolerated, Figure 6. Left ventricular hypertrophy-Ventricular tachycardia, Atrial fibrillation IMPLANTABLE LOOP RECORDERS Pathological Q wave, epsilon wave(ARVD)#, When symptoms are less frequent that is monthly or brugadapattern*-Ventricular tachycardia/fibrillation yearly and associated with hemodynamic compromise and all other modalities fail to give definite clue Long or short QT-Polymorphic ventricular tachycardia implantable recorders are used. The trigger to record Large voltages in precordial leads, T wave changes- could be externally activated by patient or automatically HOCM by device itself22-25 Figure 7. A-V block, tri- or bifascicular block-Complete heart block, ECHOCARDIOGRAPHY brady- dependent polymorphic ventricular tachycardia Echocardiography provides a structural and functional 71 CHAPTER 14 Fig. 6: External loop recorder Fig. 7: Implantable loop recorder Suggested diagnostic workup for palpitations ILR-implantable loop recorder, EPS-Electrophysiological study, AECG-Ambulatory electrocardiogram assessment of the heart,
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