BACKGROUND: Transcranial Doppler (TCD) is commonly used to monitor for vasospasm in patients with aneurysmal subarachnoid hemorrhage (aSAH). Changes in head of the bed (HOB) positions alter blood flow velocities measured by TCD in patients with ischemic stroke. However, the effects of HOB position on the velocities of the cerebral blood flow have not been studied in aSAH patients. METHODS: We measured the middle cerebral artery (MCA) mean flow velocity (MFV) in consecutive patients with aSAH using TCD with the HOB positioned at 30°-45° and then at 0°-15°. We also collected information on intracranial pressure (ICP) and arterial blood pressure at the time of the TCD studies. Our aim was to determine if changes in HOB position affect MFV in patients with aSAH. RESULTS: We analyzed 35 TCD studies in 19 patients (mean age 53 ± 13 years). Thirteen studies (37%) showed ultrasonographic evidence of vasospasm. Systolic arterial blood pressure, heart rate, and ICP were not significantly affected by HOB position. The mean MFV of the MCA was 101.0 ± 47.3 cm/s with 0°-15° HOB position versus 100.1 ± 46.8 cm/s with 30°-45° HOB position (P = 0.77 on paired t test). HOB position did not have a significant influence on MFV regardless of the presence of vasospasm. CONCLUSION: HOB position did not significantly affect MFV in our patients with aSAH.
BACKGROUND: Transcranial Doppler (TCD) is commonly used to monitor for vasospasm in patients with aneurysmal subarachnoid hemorrhage (aSAH). Changes in head of the bed (HOB) positions alter blood flow velocities measured by TCD in patients with ischemic stroke. However, the effects of HOB position on the velocities of the cerebral blood flow have not been studied in aSAH patients. METHODS: We measured the middle cerebral artery (MCA) mean flow velocity (MFV) in consecutive patients with aSAH using TCD with the HOB positioned at 30°-45° and then at 0°-15°. We also collected information on intracranial pressure (ICP) and arterial blood pressure at the time of the TCD studies. Our aim was to determine if changes in HOB position affect MFV in patients with aSAH. RESULTS: We analyzed 35 TCD studies in 19 patients (mean age 53 ± 13 years). Thirteen studies (37%) showed ultrasonographic evidence of vasospasm. Systolic arterial blood pressure, heart rate, and ICP were not significantly affected by HOB position. The mean MFV of the MCA was 101.0 ± 47.3 cm/s with 0°-15° HOB position versus 100.1 ± 46.8 cm/s with 30°-45° HOB position (P = 0.77 on paired t test). HOB position did not have a significant influence on MFV regardless of the presence of vasospasm. CONCLUSION: HOB position did not significantly affect MFV in our patients with aSAH.
Authors: Alejandro A Rabinstein; Jonathan A Friedman; Stephen D Weigand; Robyn L McClelland; Jimmy R Fulgham; Edward M Manno; John L D Atkinson; Eelco F M Wijdicks Journal: Stroke Date: 2004-06-24 Impact factor: 7.914
Authors: Paula Muñoz-Venturelli; Hisatomi Arima; Pablo Lavados; Alejandro Brunser; Bin Peng; Liying Cui; Lily Song; Laurent Billot; Elizabeth Boaden; Maree L Hackett; Stephane Heritier; Stephen Jan; Sandy Middleton; Verónica V Olavarría; Joyce Y Lim; Richard I Lindley; Emma Heeley; Thompson Robinson; Octavio Pontes-Neto; Lkhamtsoo Natsagdorj; Ruey-Tay Lin; Caroline Watkins; Craig S Anderson Journal: Trials Date: 2015-06-05 Impact factor: 2.279
Authors: Marcel J Aries; Jan Willem Elting; Roy Stewart; Jacques De Keyser; Berry Kremer; Patrick Vroomen Journal: BMJ Open Date: 2013-08-14 Impact factor: 2.692
Authors: David K Kung; Nohra Chalouhi; Pascal M Jabbour; Robert M Starke; Aaron S Dumont; H Richard Winn; Matthew A Howard; David M Hasan Journal: Biomed Res Int Date: 2013-11-25 Impact factor: 3.411