Anesthesia Hub - Questions

13 questions match your search.

Which of the following best explains the decreased effect of hyperventilation on cerebral blood flow when PaCO2 decreases below 20 mmHg?

(A) Maximal constriction of cerebral vessels
(B) Decreased cerebral perfusion pressure
(C) Decreased cerebral metabolic rate for oxygen
(D) Increased cardiac output
(E) Increased cerebrospinal fluid pressure

BASIC Neuro

Cerebral blood flow is decreased by

(A) chronic respiratory acidosis
(B) hypoxia
(C) hypoglycemia
(D) polycythemia
(E) the postictal state

BASIC Neuro

Which of the following best describes the relationship between cerebral perfusion pressure and cerebral blood flow in a patient with untreated chronic hypertension?

(A) It is constant at mean blood pressures between 50 and 150 mmHg
(B) It is linear for all blood pressures
(C) Flow versus pressure curve is hyperbolic
(D) Flow versus pressure curve is shifted to the right
(E) Flow versus pressure curve is shifted to the left

BASIC Neuro

Each of the following parameters of cerebral perfusion and metabolism is approximately equal to 50 EXCEPT

(A) cerebral oxygen consumption in ml O2/min for a normal adult
(B) lower limit of mean arterial pressure for cerebral autoregulation in mmHg
(C) normal cerebral blood flow in ml /100 g tissue/min
(D) PaO2 at which cerebral blood flow increases
(E) PaCO2 at which cerebral blood flow doubles

BASIC Neuro

A radial artery catheter is to be used for blood pressure measurement during a sitting craniotomy. When zeroing the transducer, which of the following describes the best levels for placement of the transducer and opening of the system to air? (Transducer, Opening to Air)

(A) Head Wrist
(B) Head Head
(C) Head Heart
(D) Heart Heart
(E) Heart Wrist

BASIC Equipment & Physics Neuro

In a healthy patient receiving an epidural analgesic infusion postoperatively, clear fluid is noted to drip back freely from the epidural catheter. Which of the following findings correctly identifies the associated fluid?

(A) Precipitation when mixed with an equal volume of pancuronium = local anesthetic
(B) pH 7.1 = saline solution
(C) Glucose 120 mg/dl = CSF
(D) Sodium 130 mEq/L = CSF
(E) PCO2 51 mmHg = CSF

BASIC Neuro

Each of the following statements about the blood supply of the spinal cord is true EXCEPT:

(A) The anterior spinal artery is made up of branches from the vertebral, intercostal, and iliac arteries
(B) The segmental blood supply of the cord depends upon the location of the arteria radicularis magna (Adamkiewicz)
(C) The posterior spinal arteries supply most of the spinal cord
(D) Obstruction of the inferior vena cava increases blood flow through the epidural venous plexus
(E) The spinal cord is supplied by one anterior spinal artery and two posterior spinal arteries

BASIC Neuro

Depression of cerebral oxygen requirements below the level required to create an isoelectric EEG can be achieved by

(A) administration of isoflurane
(B) administration of nimodipine
(C) barbiturate coma
(D) hyperventilation
(E) hypothermia

BASIC Neuro

In patients with blunt head trauma, cerebral perfusion pressure is determined by the gradient between

(A) diastolic pressure and central venous pressure
(B) intracranial pressure and central venous pressure
(C) mean arterial pressure and central venous pressure
(D) mean arterial pressure and intracranial pressure
(E) systolic pressure and intracranial pressure

BASIC Neuro

The most important factor regulating blood flow to ischemic cerebral tissue is

(A) systolic blood pressure
(B) PaO2
(C) cerebral perfusion pressure
(D) PaCO2
(E) cerebral oxygen consumption

BASIC Neuro

Which of the following drugs increases cerebral blood flow while decreasing cerebral metabolic rate?

(A) Etomidate
(B) Fentanyl
(C) Isoflurane
(D) Lidocaine
(E) Midazolam

BASIC Pharmacology & Pharmacokinetics Neuro

A middle-aged, 70-kg man with a brain tumor is scheduled for an elective craniotomy. Preoperatively, he is alert but papilledema is present. Anesthesia is induced with thiopental 300 mg and succinylcholine 100 mg, followed by tracheal intubation. Immediately following intubation vigorous bucking occurs. The best immediate management would be to

(A) administer succinylcholine 100 mg intravenously
(B) administer fentanyl 500 jug intravenously
(C) hyperventilate with isoflurane 2%
(D) administer thiopental 400 mg intravenously
(E) hyperventilate and administer lidocaine 1 mg/kg intravenously

BASIC General Neuro

Cerebral blood flow is decreased by each of the following EXCEPT

(A) etomidate
(B) midazolam
(C) nitrous oxide
(D) increased minute ventilation
(E) positive end-expiratory pressure

BASIC Neuro