Management of Near Syncope (Presyncope) in Pregnancy

Immediate First Aid Management

The European Society of Cardiology recommends immediately positioning the pregnant patient in left lateral decubitus position to relieve aortocaval compression from the gravid uterus, which is a pregnancy-specific cause of presyncope 1, 2
If left lateral position is not immediately feasible, assist the patient to sit or lie down in any safe position to prevent injury from potential syncope, and positioning must occur within 1-2 minutes of symptom onset 3
Physical counterpressure maneuvers (PCMs) can be beneficial to abort progression to syncope if symptoms are vasovagal or orthostatic in origin, with lower-body PCMs being more effective than upper-body maneuvers 3, 4

The American Heart Association recommends activating emergency services immediately if there is no improvement within 1-2 minutes of positioning, syncope actually occurs, symptoms worsen or recur, presyncope occurred during exertion, or patient has palpitations preceding the episode 3, 5
High-risk features requiring emergency services activation include history of structural heart disease or heart failure, family history of sudden cardiac death, and symptoms suggesting myocardial infarction or stroke 3, 5

The European Society of Cardiology recommends a 12-lead ECG as a mandatory initial assessment, which is noninvasive, inexpensive, and identifies life-threatening conditions immediately despite low 5% yield 5
Orthostatic vital signs should be measured, including blood pressure and heart rate supine and after standing, with abnormal results defined as a systolic BP drop >20 mmHg or heart rate increase >20 bpm 2, 5

Patients can be discharged with obstetric follow-up if there is no structural heart disease, normal ECG, clinical features clearly suggesting vasovagal or orthostatic syncope, and no high-risk features present 5
Admission or urgent cardiology evaluation is required for patients with age >45 years, history of heart failure or ventricular arrhythmias, abnormal ECG, physical exam findings of heart failure, or cardiac murmur suggesting outflow obstruction 5

The European Society of Cardiology recommends management of supine hypotensive syndrome by changing position to left lateral decubitus, which addresses a reversible pregnancy-specific cause 1, 2
Temporary pacing may be necessary if symptoms persist despite positioning 1, 2