After acclimation and preconditioning for 3–5 days before the procedure, the systolic blood pressure (SBP) of all animals was measured monthly, beginning from one up to six months of age using the tail-cuff method (CODA System, Kent Scientific, Torrington, CT, USA) as previously described [27 (link)].
Coda system
Manufactured by Kent Scientific
Sourced in United States
The CODA system is a non-invasive blood pressure monitoring device that measures blood pressure using the oscillometric method. It provides accurate and reliable measurements of systolic and diastolic blood pressure.
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Lab products found in correlation
Power laboratory system, by ADInstruments (2 mentions)
Powerlab system, by ADInstruments (2 mentions)
F344 rats, by Charles River Laboratories (1 mentions)
Chart 5, by ADInstruments (1 mentions)
Male sprague dawley rats, by Jackson ImmunoResearch (1 mentions)
Spr 320, by Millar (1 mentions)
High fidelity pressure volume catheter, by Millar (1 mentions)
Su6656, by Merck Group (1 mentions)
Ang 2, by Merck Group (1 mentions)
Alzet model 1002, by Durect (1 mentions)
Alzet model 2002, by Durect (1 mentions)
Moor ldi 5061, by Moor Instruments (1 mentions)
Moor software version 3, by Moor Instruments (1 mentions)
75 protocols using coda system
1
Systolic Blood Pressure Monitoring in Animals
2
Remnant Kidney Model in Rats
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In each of the male F344 rats, weighing 150–180 g (Charles River, Erkrath, Germany), 5/6 nephrectomy (remnant kidney model) was performed under ketamin/rompun anesthesia by right-sided uninephrectomy followed by ligation of two out of three renal arterial branches of the left kidney. This massively reduces the functioning nephrons and induces hypertrophy in the remaining nephrons leading to hypertension, chronic glomerulosclerosis and tubulointerstitial fibrosis culminating in end-stage uremia. Renal function was tested every other week (s-creatinine and s-urea, using an autoanalyzer) and 24-h urine was collected (for proteinuria) from animals housed in metabolic cages. Systolic blood pressure was measured by non-invasive volume pressure recording using the computerized CODA system (Kent Scientific Corporation, Torrington, CT) in conscious, trained animals.
3
Noninvasive Blood Pressure Assessment in Mice
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In a separate set of male and female C57BL/6J mice (n = 11–12 per group/sex) measurements of hemodynamic parameters were performed using the noninvasive blood pressure CODA system (Kent Scientific, Torrington, CT, USA) system. This computerized system measures systolic and diastolic blood pressure, mean blood pressure, and heart rate via tail volume pressure recordings. Animals were acclimated to the holder and cuff of the CODA system for 5 min before each recording trial. CODA trials were performed 1–2 h after daily dosing of either RK or vehicle. Animals were exposed to 5 consecutive days of recording trials, data from the last 2 days were used for data analysis (i.e., days 13 and 14 of the 2-week dosing period), see Supplementary Materials Figure S2 .
4
Non-invasive Blood Pressure Measurement in Rats
5
Measuring Blood Pressure and Urinary Protein in Pregnant Mice
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The systolic blood pressure was noninvasively measured by a volume pressure recording sensor and an occlusion tail‐cuff (CODA System, Kent Scientific). This method shows good agreement with radiotelemetry measurements of blood pressure.47 Blood pressure was measured at the same time daily (±1 hour) while the mice were kept warm using a warming pad. Twenty‐four‐hour urine was collected for analysis using metabolic cages (Nalgene). Mice were trained in metabolic cages for 2 days prior to urine collection. On GD18.5, the mean arterial pressure was determined by cannulating the right carotid artery with a mouse jugular catheter connected to a pressure transducer and an amplifier unit, just prior to euthanasia. The amplifier was connected to a data acquisition module and mean arterial pressure was recorded on a personal computer by Chart 5 Software (AD Instruments, Inc). All of the mice were euthanized on GD18.5 before delivery when their serum and organs were collected. We quantified urinary albumin by ELISA (Exocell) and measured urinary creatinine by a picric acid colorimetric assay (Exocell). We used the ratio of urinary albumin to urinary creatinine as an index of urinary protein.
6
Non-Invasive Blood Pressure Measurement
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Blood pressure was measured non‐invasively by a volume pressure‐recording sensor and an occlusion tail‐cuff (CODA System; Kent Scientific, Torrington, CT).
7
Non-invasive Blood Pressure Measurement
8
Measuring Mouse Heart Rate Variation
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To assess changes in the animals' heart rate, conscious mice were carefully restrained in a plexiglass holder. The tail of the rodent was secured in an occlusion and volume pressure cuff, to accurately determine the heart rate by volume pressure recording using the CODA System (Kent Scientific Corporation, Torrington, CT, USA). A tempered panel guaranteed a stable body temperature. Each measurement consisted of 15 repetitions and was analyzed by the supplier's software Coda 4.1 (Kent Scientific Corporation). The baseline values were set to 100% and the percentage change of the following time points was calculated individually.
9
Measuring Systemic and Aortic Blood Pressure
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Systemic systolic and diastolic blood pressures (SBP and DBP) were measured in conscious animals by restraint tail cuff every two days for 2 weeks using the CODA system (Kent Scientific, CT) as described previously [10 (link)]. Aortic blood pressure (ABP) was evaluated as previously described [19 (link)]. A catheter (Millar 2.0 F, model SPR 320, Millar Instruments, Inc., Houston, TX) was inserted via the right common carotid artery into aorta and carefully introduced into the aortic root under anesthesia with an inspired 2% isoflurane (JD Medical, AZ). The transducer was connected to Power Laboratory system (AD Instruments, Castle Hill, Australia). Systolic and diastolic aortic pressure (SAP and DAP) were recorded [10 (link)]. Pulse pressure (PP) was calculated using the formula: PP = SAP-DAP.
10
Cardiovascular Assessment in Obesity Model
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Cardiovascular parameters were measured at two timepoints; the first was performed during the development of obesity, when mice were 30, 40, 50, 60, and 70 days of age. The second occurred on days 7, 9, 13, 15, 19, 21, and 30 days post-infection. Measurements were obtained through the non-invasive CODA system (Kent Scientific, Torrington, CT) based on the volume of pressure obtained from the mouse tail26 (link),27 (link).
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