Background: Cardiovascular diseases are a leading cause of global mortality, underscoring the need for practical diagnostic tools like electrocardiography (ECG). While traditional 12-lead ECGs are comprehensive, they are often costly and lack portability. The Hamrah Doctor ECGMOBILE 3L, a 5-lead portable ECG device, presents a more accessible alternative. This study evaluates its agreement with the standard 12-lead ECG. Methods: A prospective study was conducted with 100 patients admitted to a Cardiac Care Unit (CCU). Each patient underwent ECG recordings using both the standard 12-lead ECG and the Hamrah Doctor ECGMOBILE 3L device. Interval duration measurements were compared between the two devices. Statistical analysis included paired t-tests and linear regression to assess agreement. Results: The 5-lead mobile ECG demonstrated strong agreement with the 12-lead ECG, with correlations exceeding 91% across all intervals. Minor differences in IDMs and heart rates were attributed to the sequential, rather than simultaneous, recording of ECGs. Some morphological differences, particularly in T-wave inversions, were noted but were likely due to recording conditions. Conclusion: The Hamrah Doctor ECGMOBILE 3L reliably captures ECG readings comparable to the standard 12-lead ECG. While it does not replace the 12-lead ECG, its portability, ease of use, and accessibility make it a valuable tool for continuous cardiac monitoring, especially in telemedicine and rural healthcare settings.

Introduction: Isolated precordial inverted T-wave (IPITW) is a challenging finding on electrocardiogram (ECG) due to a wide range of differential diagnoses ranging from a normal finding to coronary heart disease. The aim of this study was to determine the overall prevalence of IPITW and its underlying causes along with ECG mapping. Materials and methods: The MASHAD cohort study participants (phase II) were screened for the presence of IPITW on the ECG. Demographic and clinical information of patients with IPITW extracted from the cohort study archive. ECG mapping and trans-thoracic echocardiography were performed on randomly selected 40 participants with IPITW. These participants were divided into symptomatic and asymptomatic groups. Results: The prevalence of IPITW was 1.56%. Of the selected 40 participants (9, 22.5% male and 31, 77.5% female), IPITW was mostly present in V3 and V4 leads (77.5% in each case). There was no significant difference in the number of leads with IPITW between I, M and N patterns (p = 0.051). Hypertension, ischemic heart disease (IHD) and heart failure (HF) were the least prevalent among N pattern group. The prevalence of heart failure was the highest in M pattern group (60%). Pattern I was associated with 525.2-fold increased likelihood of IHD compared to the N pattern. I pattern had the highest sensitivity (68.42%), specificity (90.48%), positive (86.67%) and negative (76.0 %) predictive values in IHD diagnosis. Conclusions: IPITW in the presence of I pattern in ECG mapping can be an indicator for IHD.