Clinical Scenario: Intermittent SVT in a Patient with PACs
Case Presentation
Patient: 45-year-old male
Chief Complaint: Fatigue and palpitations
History of Present Illness: The patient reports feeling increasingly fatigued over the past month. He also experiences episodes of palpitations, which he describes as his heart racing suddenly for a few minutes before slowing down. These episodes occur sporadically, without clear triggers, and are accompanied by mild dizziness but no chest pain, shortness of breath, or syncope.
Past Medical History:
Premature Atrial Contractions (PACs), diagnosed 2 years ago
No history of structural heart disease
Medications:
Occasional use of beta-blockers for palpitations
No other regular medications
Social History:
Non-smoker
Moderate alcohol use
Regular exercise
Family History:
No significant cardiac history
Physical Examination
General: Appears fatigued but in no acute distress
Vital Signs: BP 120/80 mmHg, HR 90 bpm (baseline), RR 16, SpO2 98% on room air, afebrile
Cardiovascular: Regular rhythm with occasional irregular beats, no murmurs or gallops, no jugular venous distension (JVD)
Respiratory: Lungs clear to auscultation bilaterally
Abdomen: Soft, non-tender, no hepatosplenomegaly
Extremities: No edema, peripheral pulses palpable
Diagnostic Workup
Electrocardiogram (ECG): Shows normal sinus rhythm with occasional PACs; during an episode, ECG captures SVT at 180 bpm
Holter Monitor: Reveals intermittent SVT episodes, lasting a few minutes, spontaneously terminating, and interspersed with periods of normal sinus rhythm and PACs
Echocardiogram: Normal cardiac structure and function
Laboratory Tests: Normal electrolytes, thyroid function tests (TSH and free T4 within normal limits), BNP normal
Clinical Management
Acute Episode Management:
Vagal Maneuvers: Instruct the patient on performing the Valsalva maneuver during SVT episodes to terminate the arrhythmia potentially.
Pharmacologic Intervention: If vagal maneuvers are ineffective, consider the administration of adenosine under monitoring.
Long-term Management:
Medication: Start a regular beta-blocker (e.g., metoprolol) to help control heart rate and reduce the frequency of SVT episodes.
Electrophysiology Referral: Given the recurrent nature of the SVT and its impact on quality of life, refer to an electrophysiologist for further evaluation and potential catheter ablation.
Patient Education: Educate the patient on recognizing SVT symptoms, performing vagal maneuvers, avoiding known triggers (e.g., excessive caffeine), and adhering to medication.
Follow-Up:
Schedule regular follow-ups to monitor the effectiveness of treatment and adjust the management plan as needed.
Reassess with a Holter monitor periodically to evaluate the frequency and severity of arrhythmia episodes.
Educational Points for Blog
SVT Pathophysiology: Explain the mechanisms of SVT, including reentrant circuits and the role of PACs as triggers.
Diagnostic Approach: Highlight the importance of ECG, Holter monitoring, and echocardiography in diagnosing and assessing SVT.
Management Strategies: Discuss both acute and long-term management options, including non-pharmacological interventions, medications, and the role of catheter ablation.
Patient Education: Emphasize the role of educating patients on self-management techniques and lifestyle modifications to prevent arrhythmia episodes.
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