Introduction: Warfarin is a commonly utilized anticoagulant in the management of thrombosis, either prevention or treatment, with bleeding problems as one of the major adverse effect because of its narrow therapeutic index. Objective: To determine the frequency of various factors leading to warfarin toxicity which was defined as patients presented with International Normalized Ratio (INR) greater than five. Setting: Department of Adult Cardiology at National Institute of Cardiovascular Diseases (NICVD), Karachi, Pakistan. Methodology: The study type is descriptive, cross sectional. All patients who fulfilled the inclusion criteria and visited Department of Adult Cardiology at NICVD, Karachi, Pakistan were included. After ethical approval and informed and written consent. The collected data was entered using IBM SPSS - 21, for variables that were continuous mean Standard Deviation was calculated and for variables that were categorical frequency percentage were calculated. Results: Total of 87 patients with warfarin toxicity were included. 52 patients (60%) were males & 35 (40%) were females with the mean age of 48.5287 ± 13.1386 years. The factors leading to warfarin toxicity were dietary non-compliance 19 patients (21.83%), drug non-compliance in 18 (20.68%), drug-drug interactions in 12 (13.79%), irregular follow up in 23 (26.39%) and deranged liver functions in 26 (29.88%) patients. Conclusion: Warfarin toxicity has multifactorial causes. Deranged liver functions and irregular follow up of patients accounted for the most prominent factors leading to warfarin toxicity.

Background Patients with mitral stenosis (MS) are more prone to develop left atrial (LA) thrombus. This cross-sectional study was conducted to determine the frequency of LA thrombus on transthoracic echocardiography (TTE) in patients with MS.

Background Hypothyroidism can be a cause of sinus bradycardia. However, thyroid laboratory evaluation is often performed routinely in patients with complete heart block (CHB) though there is little data to support this practice. This study aimed to assess the frequency of thyroid dysfunction in patients presenting with CHB without clinical features of hypothyroidism. Methodology All patients referred for permanent pacemaker implantation for CHB were included in this cross-sectional study. Patients with known thyroid disorder or clinical features of thyroid disorder were excluded. Demographic, electrocardiography (EKG), and routine thyroid stimulating hormone (TSH) screening results were recorded. Results A total of 102 patients with complete atrioventricular (AV) block were enrolled in the study of which 50.0% (51) were male. The mean age was 61.09 ± 11.74. Co-morbidities included diabetes mellitus 44.1% (45), smoking 36.3% (37), and hypertension 55.9% (57). Mean EKG atrial rate was 82.97 ± 31.31 mmHg with a mean ventricular escape rate of 36.17 ± 5.93. Permanent pacemakers were implanted in all of the patients. Only one patient had an abnormal TSH. Conclusions We found a very low prevalence of thyroid dysfunction among patients without clinical features of thyroid dysfunction presenting with third-degree AV block. This calls for cautious prescription of thyroid testing in clinically euthyroid patients.

Funding Acknowledgements Type of funding sources: None. Background World is facing Coronavirus disease (COVID-19) pandemic since December 2019. [1, 2]. COVID-19 has significantly decreased the influx of patients presenting with cardiovascular diseases at hospitals. The aim of this study was to determine the difficulties faced by patients in visiting the cardiac outpatient department during COVID-19 era and to assess the awareness regarding telemedicine and wiliness to adopt if offered in future. Methods This cross sectional study was carried out on patients presenting to the outpatient department in a National Institute of Cardiovascular Diseases. Data was collected after verbal consent from patients. The collected data was entered using IBM SPSS version 21, mean ± SD was calculated for continuous variables and frequency and percentages were calculated for the categorical variables. Results A total of 404 patients were interviewed, 42% female and 58% male with 77.5% from urban areas and 22.5% from rural areas. A total of 32.1% patients presented with shortness of breath, 28.8% with chest pain and 19% with palpitations. Regarding cardiovascular diagnosis 69.5% had ischemic heart disease, 38.3% had hypertension, 29.3% suffered from heart failure and 10.3% had valvular heart disease. A total of 26.7% visited the emergency room during the pandemic, 81.9% were compliant with medication and only 66% were compliant with a healthy lifestyle. A total of 52.8% patients found it difficult to attend the out patients department due to limited appointments, 24% due to limited mobility due to lockdown, 18.2% due to financial issues, 14.2% due to fear of acquiring infection from the hospital. Regarding telemedicine, 11.2% of the patients were aware of it and only 4.5% had previously used it, with 41.3% patients willing to opt for telemedicine in future. Regarding barriers to usage of telemedicine, a total of 40.7% of patients had no access to internet, 32.7% did not have a smart device and 11.6% were afraid of being diagnosed incorrectly. Conclusion It was found that distancing measures, lockdowns and restricted mobility of the masses has made it difficult for patients to visit the clinics which has led to patients visiting the emergency room. Telemedicine awareness was found to be limited, however many patients were willing to adopt provided their limitations can be overcame. Abstract Figure. Difficulty faced during OPD visit  Abstract Figure. Barriers to Tele-medicine

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