The goal of this phase IV, randomized, controlled and open-label study is to assess the efficacy of peri-procedure glucocorticoid treatment in the prevention of conduction abnormalities and the need for pacemaker implantation in patients undergoing transaortic valve replacement compared to placebo. Participants randomized to the intervention group will receive a single dose of intravenous Methylprednisolone 7 mg/kg/day on the day of the procedure (1 hour before), followed by 15 mg/12 hours of daily Prednisone for 5 days.

The primary endpoint is a composite of permanent pacemaker implantation and the occurrence of new conduction abnormalities (any-degree AV block, bundle branch block, or non-specific intraventricular conduction disorder) at discharge, at 30 days and 1 year.

Aortic stenosis is the most common valvular heart disease in Europe, and its prevalence is expected to increase in the coming years. The definitive treatment is aortic valve replacement through surgery or transcatheter aortic valve implantation (TAVR). TAVR emerged as an alternative to surgery for high-surgical-risk patients, but it has also proven effective in intermediate or low surgical-risk cases, leading to an expected rise in procedures in the near future. The most frequent complication is atrioventricular block (AVB) and permanent pacemaker implantation (PPM), which has been associated with increased morbidity, hospital stay, and healthcare costs. However, it has been suggested that post-TAVR AVB may be a transient process due to the inflammatory response triggered by the procedure. Treating this inflammation could reduce the risk of AVB after TAVR, potentially benefiting both the economy and patient outcomes.

The investigators propose a phase IV, single-center, randomized, controlled trial with an unmasked evaluator to evaluate the effect of glucocorticoids on the prevention of conduction abnormalities and PPM in TAVR patients. 100 patients will be recruited (50 in the control group and 50 in the intervention group) undergoing TAVR at the General University Hospital Dr. Balmis in Alicante, excluding those with prior PPM, chronic corticosteroid treatment, or any contraindications to these drugs. The intervention group will receive a single dose of intravenous Methylprednisolone 7 mg/kg/day on the day of the procedure (1 hour before), followed by 15 mg/12 hours of daily Prednisone for 5 days. The inflammatory response and the occurrence of conduction abnormalities will be assessed through blood tests, electrocardiograms, and echocardiography. Data will be processed using IBM-SPSS version 25.0 statistical software.

Inclusion Criteria:

• Patients eligible for TAVR implantation according to current European Society of Cardiology guidelines: patients with severe symptomatic aortic stenosis that are > 75 years old or have a high surgical risk.

Exclusion Criteria:

• Patients with a prior pacemaker.
• Patients with contraindications for the use of glucocorticoids including immunosuppression, active or latent infection, documented hypersensitivity or allergy, insulin-dependent diabetes mellitus, glaucoma (both closed-angle and open-angle), recent intestinal perforation, or acute heart failure.
• Patients on prior chronic treatment with glucocorticoids (both oral, inhaled, or intravenous, but topical and ophthalmic administration is allowed).
• Access for TAVR implantation other than femoral (for example, transapical).
• Patients on medication that may interact with glucocorticoids.