Table 1.
Results (median (minimum—maximum) values) for the haemodynamic parameters studied in the testicular artery of 8 young beagle-breed dogs, in accord with the age of animals and the part of the artery imaged on each occasion.
| Segment of the Testicular Artery |
Age of Animals | ||
|---|---|---|---|
| Weeks 4–28 (Pre-Pubertal Period) |
Weeks 30–34 (Pubertal Period) |
Weeks 36–40 (Post-Pubertal Period) |
|
| Peak Systolic Velocity (m s−1) | |||
| Distal supra-testicular (region 1 of the testis) |
9.8 (4.9–21.9) a | 8.2 (6.2–16.7) a,b | 9.5 (6.8–16.4) b |
| Marginal-a (region 2 of the testis) |
8.4 (6.4–14.3) a | 9.0 (6.2–12.1) b | 11.9 (6.2–16.1) a,b |
| Marginal-b (region 2 of the testis) |
9.0 (4.4–15.9) | 7.5 (7.0–14.4) | 9.2 (7.0–18.0) |
| Intratesticular (region 3 of the testis) |
5.1 (3.2–8.5) | 4.0 (2.9–8.1) | 5.2 (5.0–5.4) |
| End Diastolic Velocity (m s−1) | |||
| Distal supra-testicular (region 1 of the testis) |
4.2 (1.9–8.1) a | 3.3 (2.6–6.3) a | 5.0 (2.6–7.7) |
| Marginal-a (region 2 of the testis) |
5.0 (2.9–8.2) | 5.2 (3.1–6.8) | 5.8 (3.1–10.0) |
| Marginal-b (region 2 of the testis) |
4.9 (2.6–8.6) | 4.6 (3.5–8.1) | 5.6 (3.5–7.1) |
| Intratesticular (region 3 of the testis) |
5.8 (3.6–9.3) | 4.2 (3.1–8.9) | 5.3 (5.3–5.3) |
| Systolic: Diastolic Velocity Ratio | |||
| Distal supra-testicular (region 1 of the testis) |
2.3 (1.6–4.3) a | 2.8 (1.7–4.1) a | 2.4 (1.7–3.7) |
| Marginal-a (region 2 of the testis) |
1.9 (1.4–2.3) | 1.9 (1.5–2.5) | 1.9 (1.5–2.4) |
| Marginal-b (region 2 of the testis) |
1.9 (1.3–3.0) | 1.8 (1.6–2.0) a | 2.1 (1.6–2.5) a |
| Intratesticular (region 3 of the testis) |
1.3 (1.1–1.9) | 1.4 (1.1–1.8) | 1.1 (1.1–1.1) |
| Systolic Acceleration (m s−2) | |||
| Distal supra-testicular (region 1 of the testis) |
0.45 (0.20–3.39) a | 0.41 (0.32–0.89) a | 0.41 (0.31–1.06) |
| Marginal-a (region 2 of the testis) |
0.35 (0.19–0.50) | 0.35 (0.22–0.40) | 0.42 (0.22–0.64) |
| Marginal-b (region 2 of the testis) |
0.30 (0.06–0.50) | 0.29 (0.20–0.65) | 0.35 (0.20–0.71) |
| Intratesticular (region 3 of the testis) |
0.18 (0.04–0.25) | 0.20 (0.01–0.25) | 0.05 (0.05–0.05) |
| Resistance Index | |||
| Distal supra-testicular (region 1 of the testis) |
0.68 (0.35–1.45) a | 0.71 (0.41–1.70) a | 0.62 (0.41–1.37) |
| Marginal-a (region 2 of the testis) |
0.45 (0.24–0.61) | 0.42 (0.32–0.60) | 0.50 (0.32–0.58) |
| Marginal-b (region 2 of the testis) |
0.44 (0.20–0.67) | 0.42 (0.38–0.50) a | 0.47 (0.38–0.61) a |
| Intratesticular (region 3 of the testis) |
0.10 (0.09–0.37) | 0.09 (0.06–0.22) | 0.08 (0.06–0.10) |
| Pulsatility Index | |||
| Distal supra-testicular (region 1 of the testis) |
0.84 (0.44–1.70) a | 1.10 (0.52–1.70) a | 0.89 (0.52–1.37) |
| Marginal-a (region 2 of the testis) |
0.58 (0.33–0.89) | 0.54 (0.40–1.03) | 0.71 (0.40–0.88) |
| Marginal-b (region 2 of the testis) |
0.57 (0.24–1.14) | 0.49 (0.58–0.74) a | 0.65 (0.49–1.01) a |
| Intratesticular (region 3 of the testis) |
0.11 (0.09–0.46) | 0.09 (0.07–0.25) | 0.08 (0.07–0.09) |
| Blood Volume (mL min−1) | |||
| Distal supra-testicular (region 1 of the testis) |
1 (1–5) a,b | 2 (1–5) a,c | 3 (1–9) b,c |
| Marginal-a (region 2 of the testis) |
1 (1–3) a,b | 2.5 (1–9) a,c | 4.5 (2–9) b,c |
| Marginal-b (region 2 of the testis) |
1 (1–5) a,b | 1 (1–5) a,c | 5 (1–7) b,c |
| Intratesticular (region 3 of the testis) |
1 (1–1) | 1 (1–2) | 1 (1–1) |
| Diameter (cm) | |||
| Distal supra-testicular (region 1 of the testis) |
0.02 (0.01–0.30) a,b | 0.08 (0.03–0.80) a | 0.08 (0.05–0.14) b |
| Marginal-a (region 2 of the testis) |
0.06 (0.01–0.10) a | 0.09 (0.04–0.70) | 0.12 (0.08–0.15) a |
| Marginal-b (region 2 of the testis) |
0.01 (0.01–0.14) a,b | 0.07 (0.01–0.12) a,c | 0.11 (0.03–0.11) b,c |
| Intratesticular (region 3 of the testis) |
0.01 (0.01–0.09) | 0.02 (0.01–0.09) | 0.04 (0.01–0.06) |
a,b,c Superscripts within the same row indicate differences between the respective age periods.