Patient | Etiology | EBP | R1 | R2 | R3 |
---|---|---|---|---|---|

HP 1 | SIH | Y | pos | pos | pos |

HP 2 | SIH | N | pos | pos | pos |

HP 3 | SP AN | N | pos | pos | pos |

HP 4 | SIH | Y | neg | pos | pos |

HP 5 | Post-LP | Y | pos | pos | pos |

HP 6 | SIH | N | pos | pos | pos |

HP 7 | SIH | Y | pos | pos | pos |

HP 8 | SIH | Y | pos | pos | pos |

HP 9 | SIH | N | pos | pos | pos |

HP 10 | SIH | N | pos | neg | neg |

HP 11 | SIH | Y | pos | pos | pos |

HP 12 | SIH | N | pos | neg | pos |

HP 13 | SIH | Y | pos | pos | pos |

HP 14 | SIH | Y | pos | pos | pos |

HP 15 | Post-LP | Y | pos | pos | pos |

**Note:**—SIH indicates spontaneous intracranial hypotension; pos, positive; neg, negative; Y, yes; N, no; SP AN, spinal anesthetic procedure; EBP, epidural blood patch was performed; R1, R2, R3, the interpretation of the venous distension sign by each reader for each patient; HP hypotension patient; Post-LP, after lumbar puncture.