Adenosine-induced transient asystole

Combined modified Valsalva maneuver with adenosine supraventricular tachycardia: A comparative study

BACKGROUND AND IMPORTANCE

Paroxysmal supraventricular tachycardia (PSVT) is an arrhythmia commonly seen in the emergency department. Both modified Valsalva maneuver (MVM) and intravenous adenosine are the first line treatment, of which the former has e lower success rate while the latter has a higher success rate but some risks and adverse effects. Given both of these reverse rhythms quickly, combining them may achieve a better effect.

OBJECTIVE

The objective of this study is to evaluate the success rate and potential risk of combining the use of intravenous adenosine while patients were doing MVM as a treatment for paroxysmal supraventricular tachycardia(pSVT).

DESIGN, SETTINGS AND PARTICIPANTS

We recruited patients with pSVT from 2017 to 2022, and randomly assigned them into 3 groups, MVM group, intravenous adenosine group, and combination therapy group, in which MVM was allowed to be performed twice, while intravenous adenosine was given in a titration manner to repeat three times, recorded the success rate and side effects in each group.

MAIN RESULTS

The success rate of the MVM group, adenosine group, and combination group are 42.11%, 75.00 and 86.11%, respectively. The success rate of the adenosine group and combination group is significantly higher than the n MVSM group (p < 0.01, p < 0.001), while the success rate of the combination group is higher than the adenosine group, it has no significant difference (p = 0.340). In terms of safety, the longest RR durations (asystole period) are 1.61 s, 1.60s, and 2.27 s, there is a statistical difference among the three groups (p < 0.01) and between the adenosine and combination group (0.018).

CONCLUSION

Therefore, we can conclude that combination therapy has a relatively high success rate and good safety profile, but the current study failed to show its superiority to adenosine.

Orbitozygomatic Transsylvian and Subtemporal Transzygomatic Approaches for Clipping of Basilar Tip Aneurysms: 2-Dimensional Operative Video

INDICATIONS CORRIDOR AND EXPOSURE

The orbitozygomatic transsylvian approach is ideal for basilar tip aneurysms (BTAs) ≤15 mm located at or above the level of posterior clinoid process (PCP), whereas for larger, low-lying BTA's with fetal posterior cerebral artery (PCA), the subtemporal transzygomatic approach is preferred. Both approaches expose the basilar tip area and structures in the interpeduncular fossa from an anterolateral angle and the lateral angle, respectively.

ANATOMIC ESSENTIALS NEED FOR PREOPERATIVE PLANNING AND ASSESSMENT

Aneurysm size and level, brainstem perforators, and PCA size (fetal or not) should be noted preoperatively.

ESSENTIAL STEPS OF THE PROCEDURE

A

Orbitozygomatic transsylvian approach.

Frontotemporal craniotomy with posterolateral orbitotomy.

Extradural optic nerve decompression and anterior clinoidectomy.

Transsylvian dissection and carotid-optic cistern decompression.

Distal dural ring opening.

Aneurysm exposure and clipping.Or.

B

Subtemporal transzygomatic approach1.

Frontotemporal incision with zygomatic osteotomy.

Temporal lobe retraction, subtemporal dissection, and tentorial division.

Cavernous sinus opening and dorsum sellae drilling.

Petrous apex resection.

Aneurysm exposure and clipping.

PITFALLS/AVOIDANCE OF COMPLICATIONS

Complications such as cranial nerve injury, perforator stroke, aneurysm rupture, and hemorrhage can be prevented by neuromonitoring, avoiding temporary basilar occlusion for >10 minutes, use of transient adenosine arrest during clipping, and interposing rubber dam between perforators and aneurysm.1.

VARIANTS AND INDICATIONS OF THEIR USE

Cavernous sinus opening with posterior clinoidectomy and dorsum sellae drilling may be performed if aneurysm neck is at or below the level of PCP.1-7The patient consented to the procedure.

Video Section-Operative Nuances: Step by Step - Single Stage Clipping of Ruptured Middle Cerebral Artery and Unruptured Basilar Top Aneurysm

Background and Introduction

Presence of multiple aneurysms, especially a combination of anterior and posterior circulation aneurysm in the same patient, is rare. Surgical clipping of both the aneurysms in the same sitting, although ideal, may be surgically challenging and requires a good preoperative planning.

Objective

In this video abstract, we present a case of a ruptured middle cerebral artery (MCA) aneurysm with a simultaneous occurrence of an unruptured basilar top aneurysm.

Surgical Technique

A 45-year-old female presented with modified Hunt and Hess grade II subarachnoid hemorrhage (SAH). CT scan showed diffuse SAH with a dense bleed in the left sylvian cistern and mild hydrocephalus. Angiography showed a left MCA aneurysm (34 mm size) with a bleb and also an un-ruptured basilar bifurcation/right posterior cerebral artery aneurysm (20 mm). The patient underwent a left frontotemporal craniotomy, zygomatic osteotomy, and clipping of both aneurysms. No temporary clips were applied. The extended craniotomy allowed the surgeon to reach to the base of the aneurysm.

Results

The patient had an uneventful recovery.

Conclusions

Simultaneous occurrence of both anterior and posterior circulation aneurysms are rare, but maybe tackled surgically with proper planning.

[Endovascular embolization of high-flow arteriovenous fistulae with non-adhesive agents in the structure of cerebral arteriovenous malformations on the background of adenosine-induced cardioplegia]

OBJECTIVE

To analyze the initial results of endovascular embolization of cerebral arteriovenous malformations involving high-flow arteriovenous fistulae with non-adhesive agents on the background of cardioplegia.

MATERIAL AND METHODS

There were 13 patients who underwent surgery in 2018. Embolization of AVM with non-adhesive agents (ONYX, SQUID) was performed on the background of temporary cardiac arrest achieved by bolus intravenous administration of adenosine triphosphate.

CONCLUSION

Adenosine administration in endovascular treatment of AVM with non-adhesive agents is able to improve the safety of surgical intervention and ensure more qualitative embolization.

Adenosine-induced transient asystole to control intraoperative rupture of intracranial aneurysms: institutional experience and systematic review of the literature

BACKGROUND

Intraoperative rupture of an intracranial aneurysm is a life-threatening situation that carries a high risk of morbidity and mortality. Since 2000, adenosine has been used successfully to induce transient hypotension and/or asystole to control bleeding and facilitate surgical clipping of aneurysms that rupture intraoperatively. Given the paucity of reports describing this method in a limited number of patients, we performed a systematic review of the literature detailing the use and outcomes of this technique.

METHODS

The authors performed a systematic review and identified all studies in which adenosine was used in the setting of an intracranial aneurysm that ruptured intraoperatively. We then determined overall morbidity and mortality rates, adding an additional six of our own patients.

RESULTS

Data was analyzed for a total of 29 patients, including 23 previously reported patients from the literature and 6 additional cases from our own experience (mean age 54.8 years, 58.6% female). Most patients (82.8%, 24/29) presented with subarachnoid hemorrhage (SAH). Overall mean dose of adenosine was 51.8 mg. Successful clipping was achieved in 100% of patients. Transient or permanent morbidity was reported in 5/29 (17.2%) and the overall mortality rate was 31% (9/29), which occurred primarily due to an initial severe SAH and its resultant complications.

CONCLUSIONS

Adenosine-induced circulatory arrest appears to safely control intraoperative bleeding and facilitate the clipping of ruptured intracranial aneurysms based on the limited published literature available. Further studies comparing patient outcomes using this technique to traditional approaches are required to validate the safety and efficacy of adenosine in this high-risk setting.

Adenosine-Induced Cardiac Arrest for Transvenous Embolization of Midbrain Arteriovenous Malformation

BACKGROUND AND IMPORTANCE

Few studies describe the use of adenosine-induced cardiac systole for treatment of cerebrovascular pathologies. We describe a midbrain arteriovenous malformation (AVM) treated with transvenous embolization using adenosine-induced asystole to achieve transient systemic hypotension with the purpose of furthering discussion on the technique and operative considerations for adenosine use in endovascular AVM treatments.

CLINICAL PRESENTATION

A 29-yr-old man presented with sudden onset of severe bilateral headache, blurred vision, and numbness on the right side of his face and tongue. Noncontrast head computed tomography revealed fourth ventricle hemorrhage. Diagnostic cerebral angiography revealed a high-flow midbrain AVM with a posterior wall perforator from the basilar artery terminus and a draining vein into the straight sinus. Transarterial AVM embolization was successful. The patient was discharged with no residual neurological deficits but returned 1 wk later with slurred speech and left-sided dysmetria. Repeat angiography revealed partial AVM filling. Attempts at transarterial embolization were unsuccessful. Thus, transvenous AVM embolization with adenosine-induced cardiac asystole and systemic hypotension was performed. A total of 60 mg of adenosine was administered, followed by 2 additional doses of 60 and 40 mg; and complete cardiac asystole with a mean arterial pressure of 40 mmHg was maintained, resulting in successful embolization of the AVM. No residual filling was visualized on postembolization arterial angiography runs. The patient was neurologically stable and discharged on postoperative day 2.

CONCLUSION

With appropriate and safe dosing, adenosine-induced asystole and systemic hypotension may be a feasible, safe option to reduce flow and assist endovascular transvenous embolization of high-flow AVMs.

Emergency department visits for paroxysmal supraventricular tachycardia in Saudi Arabia

PURPOSE

The present study aimed to compare the demographic, medical history, clinical features, and treatment management of paroxysmal supraventricular tachycardia (PSVT) in the emergency department of a teaching hospital in Riyadh, Saudi Arabia. A secondary purpose was to evaluate Adenosine response among numerous variables that might be used as predictors of the conversion.

METHODS

All PSVT cases presented to the Department of Emergency Medicine at King Khalid University Hospital, during the period from January 1, 2016, until December 31, 2016, were included in the study. Patients were assigned into two groups: adenosine sensitive (AS-group) and adenosine resistant (AR-group) according to adenosine conversion response.

RESULTS

A total of 38 patients were admitted during the study period. Fisher's exact test results showed that there were no significant (P > 0.05) differences among the AS-group and AR-group in the demographics, past medical history and clinical features, and post-ablation condition, except for the previous usage of the other anti-arrhythmic drugs to convert the last PSVT in the AR-group. The first bolus of adenosine had higher sensitivity and specificity, compared to the second bolus. Further, the second bolus of adenosine was not specific for short-term treatment of PSVT.

CONCLUSIONS

Differences in adenosine sensitivity among PSVT patients were independent of demographic, past medical history, and clinical features of PSVT patients. Thus, the difference in adenosine response among groups may be attributed to the heterozygosity in conducting pathways. The first bolus of adenosine had high sensitivity and specificity, compared to the second bolus, and their optimal levels were predictable by HR deceleration.

Adenosine to facilitate the clipping of cerebral aneurysms: literature review

Cerebral aneurysms have a high mortality rate when ruptured. Endovascular techniques have improved substantially in treating this pathology. However, surgical clip ligation remains the preferred option for some aneurysms. Various techniques are used intraoperatively to assist the surgeon in dissecting the aneurysmal dome free of surrounding tissue and placing a clip around the neck safely and effectively so that no nearby perforating vessels are affected and no residual remains. These techniques include temporary clip ligation, endovascular balloon occlusion and cardiac standstill. Adenosine use is one viable option for induced cardiac arrest leading to a short period of controlled hypotension. Its predictable course of action, rapid onset and offset and rare incidence of adverse side effects make it an attractive agent in this regard. Below, we provide an introduction to adenosine use, describing its pharmacokinetic properties, indications, contraindications, complications and future directions.