Assessment and Management of Tachycardia in Pregnant Patients

Clinical Presentation and Evaluation

The European Society of Cardiology guidelines recommend immediate evaluation for pregnant patients presenting with symptoms suggestive of cardiac arrhythmias, such as sudden onset dizziness, heart racing (tachycardia), and tingling (paresthesia) 1, 2
Documented tachycardia with a pulse of 119 during the episode warrants immediate evaluation and potential treatment 1, 2
Abnormal blood pressure readings, such as 129/49, suggesting hemodynamic changes, require prompt assessment and management 2, 3

The European Society of Cardiology guidelines recommend immediate cardioversion for ventricular tachycardia (VT) with hemodynamic instability, which can only be performed in an emergency setting 4
The American College of Cardiology recommends continuous cardiac monitoring and ECG evaluation to identify the type of arrhythmia, and appropriate treatment based on the specific arrhythmia identified 1, 2, 5
For supraventricular tachycardia (SVT), vagal maneuvers, adenosine, or cardioversion if unstable are recommended, while for VT, immediate cardioversion if unstable, and cardioselective beta-blockers if stable are recommended 2, 4, 3, 6

Pregnant patients can develop hypoxemia rapidly due to decreased functional residual capacity and increased oxygen demand, emphasizing the need for prompt evaluation and treatment 7
Physiological changes in pregnancy can exacerbate underlying arrhythmias or precipitate new ones, highlighting the importance of careful assessment and management 2, 6
The presence of a healthy fetal heart rate does not rule out the need for maternal cardiac evaluation, and pregnancy-related peripartum cardiomyopathy should be considered in the differential diagnosis 2, 4, 3

The American Heart Association suggests that a structured approach to assessing palpitations in pregnant patients, including determining the onset and termination pattern, can help diagnose conditions such as paroxysmal supraventricular tachycardia (PSVT) or sinus tachycardia 8
The American College of Cardiology recommends inquiring about the frequency, duration, and number of episodes of palpitations, as well as associated symptoms like chest discomfort or pain, dyspnea, fatigue, and polyuria, to guide further evaluation and management 8
The European Society of Cardiology notes that a history of structural heart disease, previous arrhythmias, or family history of sudden cardiac death can increase the risk of arrhythmias during pregnancy 9
The European Society of Cardiology also recommends inquiring about thyroid disease history, as hyperthyroidism can cause or exacerbate arrhythmias in pregnancy 10

The American Heart Association suggests that maneuvers like the Valsalva maneuver can be attempted to terminate palpitations, and their effectiveness should be assessed 11
The European Society of Cardiology recommends assessing for signs of hemodynamic instability, such as hypotension, altered mental status, or severe dyspnea, which would require immediate cardioversion 9
The American College of Cardiology notes that syncope associated with palpitations may suggest more serious arrhythmias, and persistent tachycardia can lead to tachycardia-mediated cardiomyopathy 8