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Table III

Stage of Pregnancy and INa and ICa of Uterine Myocyte

Days pregnantNumber of cellsINaICaINa/ICa
pA/pFμA/cm2pA/pFμA/cm2
 0  12  1.83 ± 0.53  2.77  3.74 ± 1.08   5.67  0.53 ± 0.15 
 2   5  2.03 ± 0.20  3.08  4.38 ± 1.18   6.64  0.66 ± 0.12 
 5  12  2.84 ± 0.17  4.30  7.06 ± 0.70  10.70  0.45 ± 0.07 
 9   6  2.25 ± 0.46  3.41  5.22 ± 0.30   7.91  0.54 ± 0.11 
14   8  1.99 ± 0.17  3.32  3.12 ± 0.28   5.20  0.86 ± 0.16 
17  13  1.24 ± 0.41*  2.07  3.70 ± 0.72*   6.17  0.65 ± 0.24 
18  15  2.47 ± 0.51*  3.43  1.87 ± 0.42*   2.60  2.00 ± 0.41 
21   8  3.67 ± 0.72  5.10  2.47 ± 0.51   3.43  1.62 ± 0.32 
PP  12  0.42    0.83 ± 0.12    0.57 
Days pregnantNumber of cellsINaICaINa/ICa
pA/pFμA/cm2pA/pFμA/cm2
 0  12  1.83 ± 0.53  2.77  3.74 ± 1.08   5.67  0.53 ± 0.15 
 2   5  2.03 ± 0.20  3.08  4.38 ± 1.18   6.64  0.66 ± 0.12 
 5  12  2.84 ± 0.17  4.30  7.06 ± 0.70  10.70  0.45 ± 0.07 
 9   6  2.25 ± 0.46  3.41  5.22 ± 0.30   7.91  0.54 ± 0.11 
14   8  1.99 ± 0.17  3.32  3.12 ± 0.28   5.20  0.86 ± 0.16 
17  13  1.24 ± 0.41*  2.07  3.70 ± 0.72*   6.17  0.65 ± 0.24 
18  15  2.47 ± 0.51*  3.43  1.87 ± 0.42*   2.60  2.00 ± 0.41 
21   8  3.67 ± 0.72  5.10  2.47 ± 0.51   3.43  1.62 ± 0.32 
PP  12  0.42    0.83 ± 0.12    0.57 

Direct experimental values in pA/pF are means ± SEM.  

*

Values for INa and for ICa on days 17 and 18 were significantly different from each other (P = 0.03). INa/ICa was determined for each myocyte before averaging. For current densities per unit surface, average morphometric areas from Table I are used. Weighted average cell capacitance (from Table II) used are 29 pF (0–9 d pregnant), 87 pF (14- and 17-d pregnant), and 108 pF (18- and 21-d pregnant).  

14–18 h postpartum; only 1 of 12 myocytes had INa.  

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