Arm lead inversion / technical dextrocardia can be recognized by inverted P waves, negative QRS and T waves in lead I. Chest leads have normal pattern.
Arterial puncture needle is used to puncture the artery for introducing a guide wire needed for the introduction of an arterial sheath for catheterisation.
Heparin induced thrombocytopenia type I is self limited. HIT 2 or HITTS (Heparin Induced Thrombocytopenia and Thrombosis Syndrome) is a more dangerous form.