Rapid Ventricular Pacing During Cerebral Aneurysm Surgery: a Study Concerning the Safety for Heart and Brain

Rapid Ventricular Pacing During Cerebral Aneurysm Surgery: a Study Concerning the Safety for Heart and Brain

Rapid Ventricular Pacing During Cerebral Aneurysm Surgery: a Study Concerning the Safety for Heart and Brain

Rapid ventricular pacing (RVP) is a technique to obtain flow arrest for short periods of time during dissection or rupture of the aneurysm. RVP results in an adequate fall in blood pressure which presents as an on-off phenomenon. However it is not clear whether repetitive periods of pacing are harmless for the patient. Silent cardiac and cerebral infarcts may be undetected. The investigators will study the safety of RVP, particularly for the heart and the brain.

Rapid ventricular pacing (RVP) is a technique to obtain flow arrest for short periods of time during dissection or rupture of the aneurysm. RVP results in an adequate fall in blood pressure which presents as an on-off phenomenon. The technique facilitates the dissection and manipulation of cerebral aneurysms and arteriovenous malformations (AVMs) and can be lifesaving in the case of an intraoperative bleeding or rupture. In a former study blood pressure and clinical outcome were used as study parameters. However it is not clear whether repetitive periods of pacing are harmless for the patient. Silent cardiac and cerebral infarcts may be undetected if only clinical outcome is taken as a study parameter. The investigators will study the safety of RVP, particularly for the heart and the brain, using magnetic resonance imaging, brain oxygenation (Sct O₂) evaluated by near-infrared spectroscopy and troponin levels. The purpose of this study is to evaluate the effect of repetitive periods of RVP on the oxygenation of the heart and brain using magnetic resonance imaging, Sct O2 (3) and troponin levels (4) both markers for ischemia damage.

Patients undergoing elective cerebral aneurysm clipping surgery or arteriovenous malformation surgery will be asked to take part and give informed consent. A control group of patients undergoing craniotomy without the use of RVP will be built in, having the same exclusion criteria. Both study groups receive a Magnetic Resonance Imaging of the brain pre-and postoperatively as standard of care.

Subjects receive a Magnetic Resonance Imaging of the brain pre-and postoperatively as standard of care. To screen for rapid ventricular pacing induced micro-infarcts, the contralateral hemisphere (contralateral to the hemisphere operated on) and fossa posterior will be evaluated. Troponin levels will be determinated preoperatively, peroperative and at 6, 12 and 24 hours postoperative by blood sample. Maximum cTnl level and cTnl level 24 hours will be compared. Brain oxygenation (Sct O₂) by near-infrared spectroscopy will be monitored. During surgery subjects allocated in this study arm will undergo RVP.

Subjects receive a Magnetic Resonance Imaging of the brain pre-and postoperatively as standard of care. To screen for rapid ventricular pacing induced micro-infarcts, the contralateral hemisphere (contralateral to the hemisphere operated on) and fossa posterior will be evaluated. Troponin levels will be determinated preoperatively, peroperative and at 6, 12 and 24 hours postoperative by blood sample. Maximum cTnl level and cTnl level 24 hours will be compared. Brain oxygenation (Sct O₂) by near-infrared spectroscopy will be monitored. No rapid ventricular pacing is applied perioperatively.

Rapid ventricular pacing (RVP) is a technique to obtain flow arrest for short periods of time during dissection or rupture of the aneurysm. RVP results in an adequate fall in blood pressure which presents as an on-off phenomenon. The technique facilitates the dissection and manipulation of cerebral aneurysms and arteriovenous malformations (AVMs) and can be lifesaving in the case of an intraoperative bleeding or rupture

Near infrared spectroscopy measures brain oxygenation (Sct O2), a decrease of more than 10% of the initial Sct O2 or lower than 60% during pacing will be considered as a possible risk of cerebral ischaemia.

For detection of myocardial injury, the cardiac specific enzyme Troponin (cTnl) is evaluated pre-and postoperatively.

A first blood sample is collected immediately preoperative in the operating room. Postoperative samples are taken at 6,12 and 24 hours after start surgery.

Magnetic Resonance Imaging of the brain pre-and postoperatively is used as standard of care. To screen for RVP induced micro-infarcts, the contralateral hemisphere (contralateral to the hemisphere operated on) and fossa posterior will be evaluated.

Inclusion Criteria: elective cerebral aneurysm clipping surgery arteriovenous malformation surgery craniotomy American Society of Anesthesiologists 1,2 and 3 Exclusion Criteria: cardiac abnormalities coronary heart disease valvular heart disease pregnancy