
    Write a function that calculates the total of all stable blood pressure readings (represented by even numbers) that were recorded during standardized checkpoints (even-numbered monitoring intervals) in a patient's vital signs sequence. This analysis helps identify patterns in the patient's normal readings to predict potential complications.
    

    
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total of all stable blood pressure readings (represented by even numbers) that were recorded during standardized checkpoints (even-numbered monitoring intervals) in a patient's vital signs sequence. This analysis helps identify patterns in the patient's normal readings to predict potential complications.
    

    """
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total of all stable blood pressure readings (represented by even numbers) that were recorded during standardized checkpoints (even-numbered monitoring intervals) in a patient's vital signs sequence. This analysis helps identify patterns in the patient's normal readings to predict potential complications.
    

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