Cardiac arrest is a condition where there is a sudden cessation of cardiac activity, causing a person to become unresponsive to calls/stimuli. If there is no immediate corrective action (Cardiopulmonary Resuscitation and/or defibrillation), this condition will be fatal and can progress to sudden death. A 32-year-old young man who had just worked welding pipes while working at PT.X experienced a cardiac arrest, where there was no breathing and no pulse. It is known that there are several exposures that can be found during the welding process, so it is necessary to carry out an investigation to assess the possible causes of the condition, whether it is due to occupational factors or pre-existing diseases in workers. This case study report focuses on exploring the possible causes of cardiac arrest in this young worker in accordance with his duties as a welder and recommendations for what needs to be done to prevent similar incidents from happening in the future. This case study will also help in creating awareness regarding the need for Daily Check Up monitoring in high-risk workers such as welders.

Arrest of cardiac functionby ventricular fibrillation or asystole causes a cessation of all circulation. Immediate and vigorous resuscitative measures must be instituted since irreversible brain damage from anoxia can occur within four minutes.' This catastrophe occurs in a wide variety of conditions. Consequently, it is important that everyone concerned be acquainted with known precipitating factors of cardiac arrest, as well as with current methods of prevention, diagnosis and treatment. Skillful use of the newer resuscitative techniques can prevent crippling brain damage and death. A. ETIOLOGY 1. Primary Heart Disease: Cardiac arrest is usually seen in patients with ischemic heart disease, but it may occur in its absence.2'3 When due to ischemia, ventricular fib- rillation and asystole occur with equal frequency.4 Coronary arterioscler- osis can effect the atrioventricular node and cause intermittent complete heart block with periods of ventricular arrest and, uncommonly, fibrilla- tion. These episodes, commonly referred to as Stokes-Adams attacks, are characterized by apnea, cyanosis and clonic twitching of the muscles of the face and limbs. Death occurs unless A-V conduction reappears or an ectopic focus in the ventricle takes over pacemaker function, or unless resuscitation measures are successful. Sudden cardiac arrest may develop suddenly in other forms of heart disease such as aortic or pulmonary valvular stenosis, atrial or ventric- ular septal defects, severe mitra