Some of the first principles of wound care come from Hippocrates who promoted keeping wounds dry except for irrigation.[41] Guy de Chauliac would promote removal of foreign bodies, rejoining of severed tissues, maintenance of tissue continuity, preservation of organ substance, and prevention of complications.[41] The first successful operation on a person who was stabbed in the heart was performed in 1896 by Ludwig Rehn, in what is now considered the first case of heart surgery.[42] In the late 1800s it was hard to treat stab wounds because of poor transportation of victims to health facilities and the low ability for surgeons to effectively repair organs. However, the use of laparotomy, which has been developed a few years earlier, had provided better patient outcomes than had been seen before.[43] After its inception, the use of exploratory laparotomies was highly encouraged for "all deep stab wounds" in which surgeons were to stop active bleeding, repair damage, and remove "devitalized tissues".[44] Because lapapotomies were seen to benefit patients, they were use on most every person with an abdominal stab wound until the 1960s when doctors were encouraged to use them more selectivity in favor of observation.[45] During the Korean war a greater emphasis was put on the use of pressure dressings and tourniquets to initially control bleeding.[41]