Management of Dizziness and Tachycardia in Pregnancy

Initial Assessment

• The European Society of Cardiology recommends that patients with symptoms of dizziness, tachycardia, and abdominal cramping during pregnancy should be evaluated for possible arrhythmia with a Holter monitor and referred to the emergency department if symptoms recur or worsen 1, 2
• The patient's symptoms warrant investigation for both cardiac arrhythmias and pregnancy-related complications, as the documented tachycardia is concerning for a possible supraventricular tachycardia (SVT), which occurs in 20-44% of pregnancies 1, 3
• New-onset symptoms during pregnancy require investigation to rule out underlying structural heart disease, as most palpitations during pregnancy are benign 3

Immediate Management

• The American College of Obstetricians and Gynecologists recommends that the current management with Tylenol and hydration is appropriate for initial symptom relief, and the patient should be advised to go to the ER if symptoms recur 4, 1, 2

Recommended Workup

Cardiac Evaluation

• A Holter monitor is appropriate to detect any arrhythmias if symptoms continue, and a 12-lead ECG should be performed to evaluate for any underlying conduction abnormalities or evidence of structural heart disease 5, 4, 1
• An echocardiogram should be performed to rule out structural heart disease, particularly if arrhythmias are documented, and to evaluate for peripartum cardiomyopathy 1, 6

Obstetric Evaluation

• Fetal monitoring is reassuring with a normal fetal heart rate and ultrasound, and continued monitoring of uterine contractions should be performed to evaluate the abdominal cramping 3
• Assessment for signs of preterm labor should be performed given the patient's cramping 3

When to Escalate Care

• Immediate ER referral is recommended if the patient experiences recurrent episodes of dizziness and tachycardia, development of shortness of breath, syncope or near-syncope, worsening or persistent abdominal cramping, or any signs of hemodynamic instability 1, 2, 7

Important Considerations

• Supraventricular arrhythmias can cause serious hemodynamic consequences for both mother and fetus if sustained, and patients with anxiety about the pregnancy should be addressed as stress can exacerbate symptoms 8, 4

Follow-up Plan

• If the Holter monitor shows evidence of arrhythmia, beta-blockers (particularly cardioselective ones) are first-line treatment for SVT during pregnancy, and AV nodal blocking agents should be avoided if pre-excitation is present on ECG 4, 6, 5
• Regular follow-up should be performed to monitor both maternal symptoms and fetal well-being 3

Management of Tachycardia in Pregnant Patients

Diagnostic and Treatment Approaches

• The European Society of Cardiology recommends that for supraventricular tachycardia (SVT), which is common in pregnancy (20-44%), first-line treatments include vagal maneuvers, adenosine if vagal maneuvers fail, and IV metoprolol if adenosine fails 9, 10
• If ventricular tachycardia is suspected and the patient is hemodynamically unstable, immediate electrical cardioversion is recommended, as per the European Heart Journal guidelines 11
• For stable patients with recurrent symptoms, cardioselective beta-blockers (particularly metoprolol) are the first-line prophylactic treatment during pregnancy, according to the European Heart Journal 11

Arrhythmia Management in Pregnancy

Diagnostic Considerations

• The European Society of Cardiology recommends obtaining a thorough history, including onset and termination pattern, associated symptoms, personal cardiac history, and family history, to identify patients at risk for arrhythmias during pregnancy 12
• A personal cardiac history of previous arrhythmias, structural heart disease, or congenital heart disease increases the risk of sustained tachycardia during pregnancy, according to the European Heart Journal 12, 13
• Family history of sudden cardiac death, cardiomyopathy, or inherited arrhythmia syndromes warrants close surveillance, as recommended by the European Heart Journal 12, 13

Management of Supraventricular Tachycardia

• For acute termination of SVT, the European Heart Journal recommends attempting vagal maneuvers first, followed by IV adenosine 6 mg rapid push if vagal maneuvers fail, then IV metoprolol if adenosine is ineffective 12
• Prophylactic therapy with cardioselective beta-blockers (metoprolol or propranolol) is recommended for recurrent or symptomatic SVT after the first trimester, according to the European Heart Journal 13, 14

Special Considerations

• Peripartum cardiomyopathy should be ruled out in any pregnant woman presenting with new-onset arrhythmias, particularly ventricular tachycardia, during the last 6 weeks of pregnancy or postpartum, as recommended by the European Heart Journal 14
• The American College of Cardiology and the European Heart Journal agree that amiodarone should only be used when all other therapies have failed and at the lowest effective dose due to fetal toxicity (FDA Category D) 13, 14
• ACE inhibitors, ARBs, and renin inhibitors are contraindicated throughout pregnancy, according to the European Heart Journal 14

Evidence‑Based Management of Persistent Dizziness in Pregnancy

Immediate Assessment and Stabilization

• Position the pregnant patient in the left lateral decubitus position to relieve inferior vena cava compression that can cause dizziness and bradycardia (supine hypotensive syndrome) – European Society of Cardiology (ESC) guideline. 15
• Evaluate hemodynamic stability; if unstable with documented tachycardia or bradycardia, prepare for immediate electrical cardioversion or temporary pacing, emphasizing maternal stability as essential for fetal survival – ESC guideline. 15

Cardiac Diagnostic Evaluation

• First‑degree atrioventricular (AV) block is a benign and common finding in pregnancy without structural heart disease, whereas second‑degree or complete heart block warrants closer monitoring – ESC guideline. [15][16]
• Screen for pre‑eclampsia/eclampsia by checking blood pressure ≥ 140/90 mm Hg after 20 weeks gestation, proteinuria, visual disturbances, or severe headache – ESC guideline. 15

Management of Documented Supraventricular Tachycardia (SVT)

• Initiate vagal maneuvers (e.g., Valsalva, carotid massage); if ineffective, administer intravenous adenosine 6 mg rapid push, followed by intravenous metoprolol or propranolol if adenosine fails – ESC guideline. 15
• For recurrent SVT requiring prophylaxis, prescribe cardio‑selective beta‑blockers (metoprolol 50–100 mg twice daily or propranolol 80–160 mg daily in long‑acting form) as first‑line therapy after the first trimester – ESC guideline (supported by neurology review). [15][17]
• Atenolol is contraindicated in pregnancy because of its association with fetal growth restriction – ESC guideline. 15
• If beta‑blockers are ineffective, consider oral digoxin, sotalol, or flecainide as second‑line agents – ESC guideline. 15
• Avoid AV‑nodal blocking agents when pre‑excitation is present on ECG, as they may precipitate ventricular fibrillation – ESC guideline. 15

Management of Symptomatic Bradycardia

• If symptoms persist after left lateral positioning, insert a temporary pacemaker, especially during labor and delivery for women with complete heart block who experience syncope or severe bradycardia – ESC guideline. 16
• Implant a permanent single‑chamber pacemaker for persistent symptomatic bradycardia unresponsive to conservative measures; the procedure can be safely performed after 8 weeks gestation using echocardiographic guidance to minimize fetal radiation exposure – ESC guideline. 16
• Isolated congenital complete heart block generally has favorable pregnancy outcomes when the escape rhythm is narrow‑QRS, and routine pacing is often unnecessary – ESC guideline. 16

Vestibular Migraine Management

• Use paracetamol as the first‑line acute treatment for vestibular migraine; ibuprofen (an NSAID) may be used only during the second trimester – American Academy of Neurology (AAN) review. 17
• For preventive therapy of frequent vestibular migraine, propranolol is the recommended first‑choice medication because of its favorable safety profile in pregnancy – AAN review. 17

Medication Contraindications in Pregnancy

• Do not use the following medications during pregnancy: atenolol, amiodarone (except as a last resort), ACE inhibitors, angiotensin‑II receptor blockers, topiramate, candesartan, or sodium valproate – ESC guideline and AAN review. [15][17]

Structural Heart Disease Considerations

• Always exclude coexisting structural heart disease, particularly in patients with previously repaired congenital lesions (e.g., tetralogy of Fallot, ventricular septal defect repair), before attributing dizziness solely to benign causes – ESC guideline. 15

Preeclampsia/Eclampsia Management

• Manage pre‑eclampsia/eclampsia according to obstetric protocols, including blood‑pressure control and timely delivery planning, as maternal cardiac instability can exacerbate these conditions – ESC guideline. 15