BACKGROUND Pacemaker implantation serves as a prevalent therapeutic approach for bradycardia or atrioventricular blocks associated with syncope. While generally regarded as safe, this procedure is not devoid of rare yet severe complications. Examples include lead-induced cardiac perforation resulting in pneumothorax or pericardial effusion, which pose life-threatening risks. CASE REPORT This article presents a case study detailing the experience of an 87-year-old patient diagnosed with complete atrioventricular block who underwent permanent pacemaker implantation, complicated by lead displacement and cardiac perforation. Despite the absence of typical post-implantation symptoms, such as backache, chest tightness, shortness of breath, and drops in blood pressure, the electrocardiogram (ECG) revealed a right bundle-branch block pattern. Additionally, bradycardia and occasional pacemaker capture failure were observed the day following pacemaker implantation. Subsequent X-ray and computer tomography examinations confirmed displacement of the ventricular lead and the presence of cardiac perforation and left pneumothorax. Following emergent thoracic drainage and repositioning of the right ventricular lead, the patient was discharged without further complications. CONCLUSIONS This case highlights the importance of thorough post-implantation monitoring, even in the absence of typical symptoms. Early detection through electrocardiogram, X-ray, and CT can facilitate timely intervention, as demonstrated by the successful treatment and discharge of the patient following emergent thoracic drainage and pacemaker lead repositioning.