<unk><unk> s have increased distance from skin to subarachnoid space
Upright<unk>  positioning improves LP success
Estimated lumbar puncture depth (cm) = 1 + 17[weight(kg)/height(cm)]
Ultrasound may improve identification of landmarks
If failure, consider fluoroscopy-guided procedure by IR
The obese patient
Asplenic patient
Combative patient
Severe anemia in Jehovah's Witness patients
Angiogram complications
The difficult airway
Urethritis in men
Procedures in patients with coagulopathies