Thank you, Marvin. For the fourth quarter of 2022, total revenue was $1,026,000 compared to $1,380,000 during the fourth quarter of 2021. This represents a decrease of 25.7%. This decrease was predominantly driven by a 20.6% decrease in sales of CGuard EPS to $1,026,000 in the fourth quarter of 2022 from $1,291,000 in the same period 1 year ago.
As Marvin mentioned, this sales decrease was caused by reduced shipments due to the temporary expiration of our CE Mark certification for the second half of the fourth quarter, resulting from the ongoing transition to the MDR regulatory framework from MDD previously. This was partially offset by an increase in U.S. sales related to stents used in our C-Guardian U.S. clinical trial.
We ended the quarter with a backlog of approximately $250,000 due to the temporary expiration of our CE Mark. Have we been able to ship without this temporary interruption, as Marvin said, our revenue would have been approximately $1.3 million.
Gross profit for the fourth quarter of 2022 decreased by $96,000 or 32.7% to $198,000 compared to a gross profit of $294,000 for the fourth quarter of 2021. This decrease resulted from the lower revenue due to the temporary loss of the CE mark, offset by a decrease in miscellaneous expenses.
Gross margin decreased to 19.3% during the 3 months ended December 31, 2022, from 21.3% during the 3 months ended December 31, 2021. Total operating expenses for the fourth quarter of 2022 were $5,134,000, an increase of $909,000 or 21.5% compared to $4,225,000 for the fourth quarter of 2021. This increase was primarily due to increases in expenses related to the C-Guardian's FDA study as we move towards end of enrollment, sales and marketing expenses and regulatory expenses.
Net loss for the fourth quarter of 2022 totaled $4,845,000 or $0.60 per basic and diluted share compared to a net loss of $4,097,000 or $0.53 per basic and diluted share for the same period in 2021. As of December 31, 2022, cash, cash equivalents and short-term bank deposits were $17.8 million compared to $34 million as of December 31, 2021. That concludes the financial review. Marvin?