A pseudoaneurysm of the ascending aorta (PAA) represents a rare, life-threatening
complication in cardiac surgery [1]. The anatomical localization and expansion lead
to compression or an erosive effect on the structures of the mediastinum produces
heterogeneous symptoms as well as the pulsating mass, dysphagia, hoarseness, stridor,
or angina due to obstruction of the coronary blood vessel or graft. The weakness of
the wall leads to an increased probability of spontaneous rupture which could result
in mediastinal hemorrhage, acute cardiac tamponade, hypovolemic shock and death. Surgical
treatment is mandatory because of the high risk of a fatal outcome [2].
We present a patient with double pseudoaneurysms of the ascending aorta with the origin
from the right sinus which completely occluded the right coronary artery and produced
ischemic heart symptoms.
A 61-year old woman was admitted with an eight-month history of fatigue, a sense of
palpitation, irritating dry cough and hoarse voice. The patient’s past medical history
showed that aortic valve replacement was performed 4 years ago when the mechanical
prosthesis was implanted.
Transthoracic echocardiography revealed a newly formed 4-cm-wide cystic formation
as well as a smaller round cavity behind it. The origin of the cyst was from the right
and non-coronary sinus of Valsalva. Color Doppler showed communication between the
aorta and the larger cavity during systole. Transesophageal echocardiography (TEE)
revealed a cystic formation arising from the aortic root, extending in front of the
right atrium and ventricle. It was 6.8 × 4.5 cm in diameter, divided into two cavities,
a larger front and a smaller rear with mural thrombosis.
Contrast multislice CT (MSCT) examination revealed two separated aneurysmal formations
with large mural thrombosis along the right edge of the aortic bulbus, as well as
anteriorly (Figures 1 A, B). The larger formation was found in the projection of the
root of the right coronary artery, and also the smaller pseudoaneurysm along its origin
(Figure 2 A).
Figure 1
A – Contrast multislice CT (MSCT) examination revealed two separated aneurysmal formations
with large mural thrombosis along the right edge of the aortic bulbus, as well as
anteriorly. A larger formation was found in the projection of the root of the right
coronary artery, and also a smaller pseudoaneurysm along its origin. B – Volume rendering
reconstruction MSCT revealed two separate aneurysmal formations from the right coronary
sinus with occlusion of the right coronary artery
Ao. Asc. – ascending aorta, LCA – left coronary artery, PAA – pseudoaneurysm of ascending
aorta.
Figure 2
A – MSCT volume rendering reconstruction of arteries of the heart registered double
pseudoaneurysm formation of the right coronary sinus. B – Cardiac catheterization
showed occluded right coronary artery and aneurysm filled with contrast
Ao. Asc. – ascending aorta, RCA – right coronary artery, LCA – left coronary artery,
PAA – pseudoaneurysm of ascending aorta.
Aortography revealed two pseudoaneurysmal formations in the right part of the aortic
bulbus which completely occluded the origin of the right coronary artery, which could
be visualized only due to retrograde flow from left coronary artery (Figure 2 B).
The patient underwent surgery immediately after the diagnostic procedures were done.
Cardiopulmonary bypass (CPB) was instituted by means of right femoral artery perfusion
and right femoral vein drainage. Sternotomy was performed when the body temperature
reached 25°C. During cooling while the heart was freed from adhesions, pseudoaneurysm
formation was detected from the bulbus of the aorta and origin of the right coronary
artery. When the body temperature reached 19°C CPB stopped and the aneurysm sac was
opened. The aortic valve prosthesis was inspected and there was no apparent purulent
material or chronic granulation tissue to suggest active endocarditis. Aortic repair
was performed after debriding the pseudoaneurysm sac and trimming its edges. Patch
repair was performed using a Dacron material. The transected right coronary artery
was reconstructed using by 6-mm woven graft, and a proximal anastomosis was constructed
on the ascending aorta. After reconstruction CPB and the rewarming process were started.
The total deep hypodermic circulatory arrest time was 35 minutes. Systemic rewarming
was done and cardiopulmonary bypass was weaned off. Postoperative TEE showed an intact
repair with no significant residual lesions.
There were no complications during the operative and postoperative period. The postoperative
recovery was uneventful and patient was discharged home in good condition.
The available medical literature reports an incidence of less than 0.5%, with a high
mortality rate (29–46%) [2, 3]. Previous cardiac surgery procedures increase the incidence
rate more than 13%. Infection, connective tissue disease, chronic hypertension, aortic
calcification or trauma increase the risk for PAA developing [2]. Among those possible
etiologies, infection was reported to be the most prominent cause in up to 50% of
cases. Staphylococcus aureus seems to be the most isolated organisms in patients with
positive blood culture [4]. The most common surgical cause of PAA is aortic injury
in the area of cannulation and cross-clamp, cardioplegia needle place and on the suture
lines. Approximately half of the PAA cases manifest within 2 years after surgery,
but intervals up to 18 years have been reported [4]. In our case, the PAA formation
developed 4 years after aortic valve replacement. The most likely place of PAA occurrence
was at the previous aortotomy suture line. The cause for the PAA developing after
4 years is questionable, because our patient did not have signs of infectious endocarditis,
chronic hypertension or connective tissue disease.
Cardiac catheterization and angiography used to be the gold standard in the diagnosis
of pseudoaneurysm, but are no longer required due to the existence of modern non-invasive
methods as well as cardiac magnetic resonance (CMR). It is, however, still necessary
if the symptomatology is dominated by anginal ailments such as was the case with our
patient, in whom one of the two pseudoaneurysm completely occluded the origin of the
right coronary artery [2].
The surgical management of PAA remains a challenge. The literature reported a mortality
rate of about 29% to 46%, most frequently as a consequence of fatal hemorrhage resulting
from rupture of the pseudoaneurysm during sternal re-entry or surgical maneuvers for
its repair. Median sternotomy using a femorofemoral bypass and hypothermic circulatory
arrest has been the strategy of choice [5]. Endovascular procedures are limited to
patients who have very high intraoperative risk [6].
The distinctive feature of our case is the existence of a very rare double pseudoaneurysm
of the aorta which occluded the origin of the right coronary artery, causing the symptoms
of unstable angina pectoris. The patient was operated on and postoperative recovery
was uneventful.
Disclosure
The authors report no conflict of interest.