The heart is the most unusual muscle in our body. It works tirelessly, begins beating in the womb and can even continue functioning when the brain fails. Yet, when we’re young, we barely pay any attention to it. 29-year-old twins Naomi and Joëlle Karfich are active, have healthy diets and feel fit. But when it comes to their hearts, they don’t have much to go on. They’re unaware of any potential genetic risks or how their heart health has been measured up to now. That’s why they’ve come to see Conchita Ruiz-Mohné, in Cologne. The cardiologist is an expert in female cardiovascular medicine, a field that has long been neglected. Women's hearts differ from men's, and often present subtler heart attack symptoms. This can lead to dangerously late diagnoses. Every minute counts in a heart attack: as soon as the blood supply stops, heart tissue begins to die, irretrievably.