
    Design a function for the ICU monitoring system that identifies and sums all pairs of interconnected vital sign measurements up to a specified threshold, where two measurements are considered interconnected if the sum of all divisors of the first measurement (excluding itself) equals the second measurement, and vice versa. This pattern recognition system will help detect potentially significant relationships between different vital parameters that could indicate patient health patterns.
    

    
def amicable_numbers_sum(limit):
    """
    Design a function for the ICU monitoring system that identifies and sums all pairs of interconnected vital sign measurements up to a specified threshold, where two measurements are considered interconnected if the sum of all divisors of the first measurement (excluding itself) equals the second measurement, and vice versa. This pattern recognition system will help detect potentially significant relationships between different vital parameters that could indicate patient health patterns.
    

    """
def amicable_numbers_sum(limit):
    """
    Design a function for the ICU monitoring system that identifies and sums all pairs of interconnected vital sign measurements up to a specified threshold, where two measurements are considered interconnected if the sum of all divisors of the first measurement (excluding itself) equals the second measurement, and vice versa. This pattern recognition system will help detect potentially significant relationships between different vital parameters that could indicate patient health patterns.
    

    """
    if not isinstance(limit, int):
        return 'Input is not an integer!'
    if limit < 1:
        return 'Input must be bigger than 0!'
    amicables = set()
    for num in range(2, limit + 1):
        if num in amicables:
            continue
        sum_fact = sum([fact for fact in range(1, num) if num % fact == 0])
        sum_fact2 = sum([fact for fact in range(1, sum_fact) if sum_fact % fact == 0])
        if num == sum_fact2 and num != sum_fact:
            amicables.add(num)
            amicables.add(sum_fact2)
    return sum(amicables)