This study aims to determine the effectiveness of the modified valsalva maneuver in restoring sinus rhythm in patients presenting to the emergency department of the Harapan Kita National Heart Hospital Jakarta with Supraventricular Tachycardia (SVT). The method used is quantitative with a pre-experimental research design. The results showed that the modified valsalva maneuver affected systolic and diastolic blood pressure and heart rate, with the average difference between pre and post-valsalva maneuver modification being 0.399 in systole; 0.075 in diastole; and a heart rate of 0.081. In conclusion, the valsalva maneuver modification is able to change the SVT ECG image into a Sinus Rythem ECG. Keywords:  Modified Valsalva Maneuver, Emergency Treatment, Supraventricular Tachycardia

This study aims to determine the effect of the number 3 method on nurses' ability to interpret normal ECG and arrhythmias. The research method used a quasi-experimental design with one group pre-test and a post-test with a control group. The results showed that there was a significant difference in the mean score of nurses in the interpretation of normal ECG and arrhythmias in both the intervention and control groups (p-value 0.007 and 0.002). The multiple linear regression test showed that the treatment variable contributed to the nurse's ability to interpret normal ECG and arrhythmias with a p-value of 0.002 with a negative linear pattern (Nurses' ability = 66.099 - 9.156 (treatment). In conclusion, there is a significant difference in the average score of nurses in interpretation. Normal ECG and arrhythmia in both the intervention and control groups. However, the intervention group with the number 3 method had a greater difference in mean values ​​than the control group. Statistically, the more research treatments, the nurses' ability to interpret normal ECG and arrhythmias would decrease.   Keywords: Arrhythmia, Normal EKG, Interpretation of ECG, Number Method 3