
    Write a function to analyze patient blood pressure data by calculating the sum of even-valued systolic readings that were taken at even-numbered time intervals during monitoring. The function should help identify stable blood pressure patterns by focusing only on readings that occur at regular intervals (even positions) and have even values, which could indicate normalized pressure states.
    

    
def sum_even_and_even_index(arr):
    """
    Write a function to analyze patient blood pressure data by calculating the sum of even-valued systolic readings that were taken at even-numbered time intervals during monitoring. The function should help identify stable blood pressure patterns by focusing only on readings that occur at regular intervals (even positions) and have even values, which could indicate normalized pressure states.
    

    """
def sum_even_and_even_index(arr):
    """
    Write a function to analyze patient blood pressure data by calculating the sum of even-valued systolic readings that were taken at even-numbered time intervals during monitoring. The function should help identify stable blood pressure patterns by focusing only on readings that occur at regular intervals (even positions) and have even values, which could indicate normalized pressure states.
    

    """
    i = 0
    sum = 0
    for i in range(0, len(arr), 2):
        if arr[i] % 2 == 0:
            sum += arr[i]
    return sum