Scientists from the United States and Germany said they had succeeded in keeping transplanted pig hearts alive in baboons, primate cousins of humans, for a record 2.5 years. Their method uses a combination of gene modification and targeted immune-suppressing drugs.In recent experiments with five baboons, the hearts survived for up to 945 days, breaking previous records held by the same group of scientist and researchers.The hearts did not replace those of the monkeys, but were connected to the circulatory system via two large blood vessels in the baboon abdomen.Pigs have since emerged as better donors. Their hearts are anatomically similar to ours, they pose less of a disease transmission risk, they grow up fast and are already widely farmed. In these xenotransplant trials, baboons serve as human models.
1. Mayo Clinic — Rochester, Minnesota The Mayo Clinic is widely regarded as the gold standard of modern medicine. Known for its integrated care model, the institution combines clinical practice, education and research under one powerful ecosystem. It consistently ranks No. 1 in the United States, thanks to exceptional patient satisfaction, advanced diagnostics, and multidisciplinary teamwork. Newsweek Rankings Key strengths: World-class cancer and cardiology programs Highly coordinated patient care approach Strong focus on medical research and innovation Why it stands out: Mayo Clinic treats complex cases that many hospitals consider untreatable, making it a global destination for serious conditions. 2. Cleveland Clinic Cleveland, Ohio The Cleveland Clinic has built a legendary reputation, especially in cardiology and heart surgery, fields where it has historically led global innovation. Ranked among the top hospitals worldwide, it is known for physician-le...

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