Secondary prevention after cryptogenic cerebrovascular events in patients with patent foramen ovale

Migraineurs with patent foramen ovale have larger right-to-left shunt despite similar atrial septal characteristics

The objective of the study was to assess differences in proportion of large right-to-left shunt (RLS) and atrial septal characteristics between migraineurs and non-migraineurs referred for transcatheter closure of patent foramen ovale (PF0). This retrospective study took place in a large metropolitan medical centre. The patients were migraineurs with aura (n=52), migraineurs without aura (n=19) and non-migraineurs (n=149). RLS was evaluated before closure using bilateral power m-mode transcranial Doppler at rest and after calibrated, sustained Valsalva manoeuvre, and graded with a validated 0–5 scale. Intracardiac echocardiography was used to assess atrial septal characteristics. Migraineurs had a higher proportion of large RLS (Grade IV or V) than nonmigraineurs at rest and after calibrated Valsalva (rest, p=0.04; Valsalva, p=0.01). Atrial septal characteristics were similar between groups. Migraine is associated with larger RLS at rest and strain; however migraine status does not predict PFO characteristics.

Spontaneous large right-to-left shunt and migraine headache with aura are risk factors for recurrent stroke in patients with a patent foramen ovale

BACKGROUND

We sought to determine whether migraine headache with aura (MHA) and spontaneous large right-to-left (R-L) shunt are risk factors for recurrent cerebral ischemic events in cryptogenic stroke patients with a patent foramen ovale (PFO).

METHODS

140 patients with a PFO and cryptogenic stroke underwent transcatheter defect closure at our institution at a mean age of 45+/-13 years. We retrospectively analyzed follow-up data from the first cerebral ischemic event to the time of PFO closure. Before the procedure, all patients underwent transesophageal echocardiography (TEE); Transcranial Doppler scanning (TCD) was additionally performed on the last 59 patients. We analyzed the impact of MHA, thrombophilia, spontaneous large R-L shunt, and atrial septal aneurysm (ASA) on the risk of recurrent cerebral ischemic events.

RESULTS

44 patients (31%) had had at least 1 recurrent event during a follow-up of 2.2+/-2.6 years. Patients with recurrent events were more commonly females (p=0.0001), had more often an associated thrombophilia (p=0.0077), and had a higher prevalence of spontaneously large R-L shunt both at TEE and at TCD (p<0.05). They also had more commonly a history of MHA (p=0.0009) and more frequent episodes of MHA (p=0.0048). Patients with MHA had a higher risk of recurrent events when compared to patients without (odds ratio 3.87, 95% CI 1.75 to 8.50). Thrombophilia (p=0.001) and spontaneous large R-L shunt (p=0.02) were independent predictors of recurrent stroke.

CONCLUSIONS

In cryptogenic stroke patients with a PFO, a history of MHA, large spontaneous large R-L shunt, and thrombophilia are all associated with a higher risk of recurrent events.

Patent foramen ovale and cerebrovascular diseases

Patent foramen ovale (PFO) has been linked to ischemic strokes of undetermined cause (cryptogenic strokes). PFO-a remnant of fetal circulation when the foramen ovale does not seal after birth-can permit microemboli to escape the pulmonary filter into the intracranial circulation, causing stroke. Coexistent atrial septal aneurysm, pelvic deep vein thrombosis and inherited clotting factor deficiencies could potentiate stroke risk in patients with PFO. Transcatheter PFO closure, a minimally invasive procedure, is one technique used to prevent recurrent cerebrovascular events. A connection between PFO and migraine headache has been conceptualized from retrospective evidence of reduced migraine frequency and severity after PFO closure; however, prospective randomized trials are needed to verify the efficacy of PFO closure on migraine prevention. In this review we discuss embryologic origins, diagnostic techniques and treatment options for prevention of paradoxical embolism thought to be related to PFO, and the relation of PFO to cryptogenic stroke and migraine.

Transcatheter closure of patent foramen ovale in older adults

OBJECTIVES

Comparing results of patent foramen ovale (PFO) closure in older and younger patient cohorts.

BACKGROUND

The literature pertaining to stroke and PFO has focused on patients <55 years of age.

METHODS

Between March 2000 and December 2003, 456 consecutive stroke/transient ischemic attack (TIA) patients (14.2-91.1 years, mean 51.4 +/- 15.5) underwent successful closure of PFO with a CardioSEAL Septal Occluder by one operator at five hospitals. Of the 456 patients, 184 (40.4%) were >55 years of age at the time of the procedure (mean 66.9 +/- 8.3 years) and comprise the subject group (OLDER). The remaining 272 patients (mean 41.1 +/- 7.7) comprise the control group (YOUNGER). Data were collected prospectively in a registry type format.

RESULTS

Minor procedural complications were comparable: 7/184 (3.8%) OLDER vs. 12/272 (4.4%) YOUNGER (P = NS). In the follow-up period (1-45 months, mean = 17.8 +/- 11.1), there was no significant difference in the rate of recurrent stroke/TIA, headaches, or late unrelated death. Forty OLDER patients and 47 YOUNGER developed new onset atrial arrhythmia (P = NS). The incidence of new onset atrial fibrillation (AF), however, was significantly higher in OLDER (14/40 OLDER and only 2/47 YOUNGER, P < 0.025). All patients who were in normal sinus rhythm (NSR) before the procedure are in NSR at last follow-up.

CONCLUSIONS

Older patients should not be excluded from PFO closure. The procedure seems as safe and effective in preventing recurrent stroke in the older, as in the younger population. Older patients seem more prone to developing AF.