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Question of the Week: October 15, 1999 Identify the following rhythm. Answer: Sinus rhythm with 2nd degree heart block, Wenkebach phenomena (Type I Block) (P - P regular, R - R irregular, more P's than QRSs with a pattern of progressive prolongation of the PR interval until one QRS is dropped). The...

Right Ventricle Waveform - Direct Measurement Note that the rise in the right ventricular pressure occurs simultaneous with the QRS (the pressure rise is produced by ventricular depolarization and begins before mechanical systole). The small rise in ventricular pressure that occurs as a result of...

Pulmonary Artery Waveform The beginning of diastole can be identified by the dicrotic notch (in blue). The pulmonary artery waveform has the same morphology (shape) as other arterial waveforms, but is subject to considerable movement artifact as a result of breathing and ejection of blood from the...

Right Ventricular Waveform The rise in pressure begins simultaneously with ventricular depolarization (the QRS). When the right ventricle pressue is measured from a pulmonary artery catheter, the distance between the catheter tip and the transducer produces a delay between the QRS and the appearance...

Question of the Week: October 29, 1999 My patient's oxygen saturation is being measured continuously by pulse oximetry. When should I measure blood gases? Answer

Question of the Week: October 27, 2000 A patient has full thickness burns to his entire back and chest. Limbs and face are unburned. What percentage body surface area is burned? Answer

Question of the Week: November 26, 1999 How can I assess motor function? Answer

Question of the Week: June 23, 2000 A patient is able to lift their leg off the bed, but is unable to keep it elevated when an examiner exerts an opposing force. Using a scale of 0 - 5, what motor score would you assign to this movement? Answer

Question of the Week: November 5, 1999 Identify the following ECG rhythm. Answer: Sinus rhythm with blocked PAC's (in a trigeminal pattern). Note the long pause identified by the blue horizontal line. Look at the T wave on the beat prior to each pause...the T wave has a notch or buried P wave...

Question of the Week: January 21, 2000 Describe the significant finding on the following arterial pressure waveform? Answer: Electrical Alternans. Criteria: Regular ECG rhythm. Alternating QRS complexes have decreased voltage or flipped axis. Alternating QRSs can be evident in one or multiple leads...