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Lead configurations for impedance plethysmographic investigation using Parulkar's method. (a) and (b) show electrode placement for recording IPG waveforms from neck and thorax respectively. For assessment at thigh, knee, calf and ankle locations V1, V2 and 12 are applied as in (c), (d), (f) and (g) respectively, retaining the placement of Il, El and E2 as in (a). IPG assessment at knee in elevated position is shown in (c). Placement of V1, V2 and 12 for IPG assessment at elbow is shown in (b) without alteration in the placement of 11, E1 and E2. The location of V1 and V2 for assessment at upper arm, forearm and wrist are shown by dotted lines.

Lead configurations for impedance plethysmographic investigation using Parulkar's method. (a) and (b) show electrode placement for recording IPG waveforms from neck and thorax respectively. For assessment at thigh, knee, calf and ankle locations V1, V2 and 12 are applied as in (c), (d), (f) and (g) respectively, retaining the placement of Il, El and E2 as in (a). IPG assessment at knee in elevated position is shown in (c). Placement of V1, V2 and 12 for IPG assessment at elbow is shown in (b) without alteration in the placement of 11, E1 and E2. The location of V1 and V2 for assessment at upper arm, forearm and wrist are shown by dotted lines.