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Cakmak YO, Khwaounjoo P, Pangilinan J, Wise IK, Burrows C, Kolakshyapati P, Williams Z, Bannon P. Decreasing the blood flow of non-compressible intra-abdominal organs with non-invasive transcutaneous electrical stimulation. Sci Rep 2024; 14:10122. [PMID: 38698055 PMCID: PMC11066058 DOI: 10.1038/s41598-024-55165-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 02/21/2024] [Indexed: 05/05/2024] Open
Abstract
Non-invasive neuromodulation of non-compressible internal organs has significant potential for internal organ bleeding and blood-shift in aero/space medicine. The present study aims to investigate the potential influences of the non-invasive transcutaneous electrical nerve stimulation (TENS) on multiple non-compressible internal organs' blood flow. Porcine animal model (n = 8) was randomized for a total of 48 neuromodulation sessions with two different TENS stimulation frequencies (80 Hz, 10 Hz) and a placebo stimulation. A combination of two different electrode configurations (Abdominal-only or Abdominal and hind limb) were also performed. Intraarterial blood flow measurements were taken during pre and post-stimulation periods at the left renal artery, common hepatic artery, and left coronary artery. Intracranial, and extracranial arterial blood flows were also assessed with digital subtraction angiography. TENS with abdominal-only electrode configurations at 10 Hz demonstrated significant reductions in average peak blood flow velocity (APV) of the common hepatic artery (p = 0.0233) and renal arteries (p = 0.0493). Arterial pressures (p = 0.0221) were also significantly lower when renal APV was reduced. The outcome of the present study emphasises the potential use of TENS in decreasing the blood flow of non-compressible internal organs when the correct combination of electrodes configuration and frequency is used.
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Affiliation(s)
- Yusuf O Cakmak
- Point-of-Care Technologies Theme, Centre for Bioengineering and Nanotechnology, Dunedin, New Zealand.
- Interventional Technologies Theme, Medical Technologies Centre of Research Excellence, Auckland, New Zealand.
- Centre for Health Systems and Technologies, University of Otago, Dunedin, New Zealand.
- Brain Health Research Centre, University of Otago, Dunedin, New Zealand.
- Cakmak Lab, Department of Anatomy, School of Biomedical Sciences, University of Otago, PO BOX 56, Dunedin, 9054, New Zealand.
| | - Prashanna Khwaounjoo
- Cakmak Lab, Department of Anatomy, School of Biomedical Sciences, University of Otago, PO BOX 56, Dunedin, 9054, New Zealand
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Joseph Pangilinan
- Cakmak Lab, Department of Anatomy, School of Biomedical Sciences, University of Otago, PO BOX 56, Dunedin, 9054, New Zealand
| | - Innes K Wise
- Hybrid Theatre, Charles Perkins Centre, The University of Sydney, Sydney, Australia
| | - Chris Burrows
- Hybrid Theatre, Charles Perkins Centre, The University of Sydney, Sydney, Australia
| | | | - Zoe Williams
- Hybrid Theatre, Charles Perkins Centre, The University of Sydney, Sydney, Australia
| | - Paul Bannon
- Hybrid Theatre, Charles Perkins Centre, The University of Sydney, Sydney, Australia
- Cardiovascular Surgery, Sydney Medical School, Sydney, Australia
- The Baird Institute of Applied Heart & Lung Surgical Research, Sydney, Australia
- Department of Cardiothoracic Surgery, Royal Prince Alfred Hospital, Sydney, Australia
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Renal denervation in a patient with a highly tortuous renal artery using a guide extension catheter: a case report. BMC Cardiovasc Disord 2021; 21:388. [PMID: 34376149 PMCID: PMC8353827 DOI: 10.1186/s12872-021-02199-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 08/05/2021] [Indexed: 12/16/2022] Open
Abstract
Background Catheter-based renal denervation (RDN) has been introduced to treat resistant hypertension. Although the technology of RDN has been largely improved, denervation of tortuous renal arteries remains challenging. Case presentation This is a case report of a 49-year-old man with drug resistant hypertension. The patient was selected for RDN after ruling out possible causes of secondary hypertension. Computed tomography angiography showed a highly tortuous left renal artery. An Iberis multielectrode ablation catheter failed to reach the target vessel with a regular guiding catheter. A 5-French extension catheter was introduced into the proximal segment of the main left renal artery to provide extra support force, which enabled successful ablation of the highly tortuous left renal artery. His ambulatory blood pressure was significantly decreased at 1 month follow-up. Conclusions It is feasible and effective to use a guide extension catheter for denervation of highly tortuous renal arteries. The present study provides a useful method to ablate tortuous and angled renal arteries and branches.
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