The invention relates to a medical implantable lead of the kind being adapted to be implanted into a human or animal body for monitoring and/or controlling of an organ inside the body. The lead comprising a penetrating fixation element (3) in a distal end, which is adapted to penetrate into the tissue (5) of the organ to fixate the lead such that a distal end of the lead will be in contact with the organ, an electrode member (3) to receive and/or transmit electrical signals from and/or to the organ. The lead comprises in a distal portion a movable member (8), which is displaceable in an axial direction of the lead and is actuated by a resilient member (9) to be, in an initial state, maximally protruded in a distal direction in relation to the lead and which comprises a radiopaque material for forming of a first indication marker. The lead also comprises a second indication marker (11) of a radiopaque material in relation to which the movable member is displaceable, and in that the first and the second indication markers are arranged such that, when observing the lead in an implanted state by means of fluoroscopy, it will be recognizable from the relative positions of the first and second indication markers, whether the distal end (7) of the lead is in close contact with the surface of the tissue (5) or not. The invention also relates to a method for ensuring proper and safe attachment of a medical implantable lead to an organ.Cette invention concerne une dérivation implantable médicale pouvant être implantée dans lorganisme de lhomme ou de lanimal en vue de surveiller et/ou de contrôler un organe. La dérivation comporte à son extrémité distale un élément de fixation perforant (3) conçu pour pénétrer dans le tissu (5) de lorgane et pour fixer la dérivation de façon à ce que son extrémité distale soit en contact avec lorgane, et une électrode (3) qui reçoit et/ou transmet des signaux électriques depuis et/ou vers lorgane. La dérivation comporte, dans une partie distal
